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SYNTHESIS OF MONODISPERSE HOLLOW POLYMER MICROSPHERES WITH FUNCTIONAL GROUPS BY DISTILLATION PRECIPITATION POLYMERIZATION 被引量:4
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作者 杨新林 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2010年第2期277-285,共9页
Monodisperse hollow polymer microspheres having various functional groups on the shell-layer, such as carboxylic acid, pyridyl and amide, were prepared by two-stage distillation precipitation polymerization in neat ac... Monodisperse hollow polymer microspheres having various functional groups on the shell-layer, such as carboxylic acid, pyridyl and amide, were prepared by two-stage distillation precipitation polymerization in neat acetonitrile in the absence of any stabilizer or additive, during which monodisperse poly(methacrylic acid) (PMAA) afforded from the first-stage polymerization was utilized as the seeds for the second-stage polymerization. The shell layer with different functional groups was formed during the second-stage copolymerization of either divinylbenzene (DVB) or ethyleneglycol dimethacrylate (EGDMA) as crosslinker and the functional comonomers, in which the hydrogen-bonding interaction between the carboxylic acid group of PMAA core and the functional groups of the corresponding comonomers, including carboxylic acid, amide and pyridyl, played an essential role for the formation of monodisperse core-shell functional microspheres. The hollow polymer microspheres were then developed after the subsequent removal of PMAA cores by dissolution in ethanol under basic condition. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to determine the morphology of the resultant PMAA core, functional core-shell microspheres and the corresponding hollow polymer microspheres with different functional groups. FT-IR spectra confirmed the successful incorporation of the various functional groups on the shell layer of the hollow polymer microspheres. 展开更多
关键词 Hollow polymer microsphere Distillation precipitation polymerization Functional microsphere Hydrogen- bonding interaction.
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Preparation of high selective molecularly imprinted polymers for tetracycline by precipitation polymerization 被引量:4
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作者 Tao Jing Xiao Dan Gao +5 位作者 Peng Wang Yan Wang Yan Fei Lin Xu Chen zong Yi Kai Zhou Su Rong Mei 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第12期1535-1538,共4页
High selective molecularly imprinted polymers (MIPs) for tetracycline have been prepared by precipitation polymerization. Effects of monomer and solvent, the ratio of monomer and template and the characterization of... High selective molecularly imprinted polymers (MIPs) for tetracycline have been prepared by precipitation polymerization. Effects of monomer and solvent, the ratio of monomer and template and the characterization of the polymer were investigated by frontal chromatography and selectivity experiment. The results clearly indicated that the polymer, which had the highest molecular recognition abilities for tetracycline antibiotics, had been received. 展开更多
关键词 precipitation polymerization Tetracycline antibiotics Molecularly imprinted polymers (MIPs) HPLC
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Monocrotophos Molecularly Imprinted Microspheres Prepared by Precipitation Polymerization in Acetonitrile 被引量:1
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作者 Shoulei Yan Zhixian Gao +1 位作者 Yanjun Fang Yiyong Cheng 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期621-622,共2页
Molecularly imprinted microspheres (MIP) for monocrotophos have been prepared by precipitation polymerization in acetonitrile (ACN) 60℃,24 h,using methacrylic acid (MAA),ethylene glycol dimethacrylate (EGDMA) and 2, ... Molecularly imprinted microspheres (MIP) for monocrotophos have been prepared by precipitation polymerization in acetonitrile (ACN) 60℃,24 h,using methacrylic acid (MAA),ethylene glycol dimethacrylate (EGDMA) and 2, 2-azobisiobutyronitrile (AIBN) as functional monomer,cross-linker and initiator,respectively.The recognition mechanism was elucidated by UV-vis spectra and computer modeling.Equilibrium binding experiment was employed to investigate the rebinding properties,Scatchard analysis showed that specific binding sites formed in the imprinted microspheres,and there were two kinds of binding sites,one was high binding sites,the other was low binding sites.This microspheres can be useful affinity absorbent used for organophosphorus pesticides separation and purification in food and environmental analysis. 展开更多
关键词 MONOCROTOPHOS molecular imprinting microspheres precipitation polymerization
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Functional monodisperse microspheres fabricated by solvothermal precipitation co-polymerization 被引量:1
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作者 Fenghao Guo Yuanyuan Ding +2 位作者 Yanyan Wang Xiao Gao Zhiyong Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第6期323-331,共9页
Simultaneous achievement in high solid content and high microsphere yield is deemed a challenge in the fabrication of monodisperse microspheres by precipitation polymerization.We herein demonstrate that micro-sized mo... Simultaneous achievement in high solid content and high microsphere yield is deemed a challenge in the fabrication of monodisperse microspheres by precipitation polymerization.We herein demonstrate that micro-sized monodisperse poly(methacrylic monomer-divinylbenzene)microspheres containing epoxy,lauyl,carboxyl and hydroxyl functions can be fabricated by solvothermal precipitation copolymerization at 20%(mass)monomer loading with over 94%microsphere yield.The morphology and porosity of the obtained particles can be readily tuned by cosolvent-acetonitrile binary solvents.Addition of a small amount of cosolvent that has similar solubility parameter to that of the functional monomer can significantly improve the monodispersity of the obtained microspheres.When tetrahydrofuran was used as the co-solvent,the surface area of the highly porous microspheres achieved higher than 400 m^(2)·g^(-1).Solvothermal precipitation co-polymerization can be expected in scale-up fabrication of various monodisperse functional microspheres free of any surfactant and additive. 展开更多
关键词 Monodisperse microsphere SOLVOTHERMAL Methacrylic monomer precipitation polymerization Core-shell structure
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PREPARATION OF MONODISPERSE CROSSLINKED POLYMER MICROSPHERES HAVING CHLOROMETHYL GROUP BY DISTILLATIONPRECIPITATION POLYMERIZATION 被引量:2
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作者 Shu-FengLi Xin-LinYang Wen-QiangHuang 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2005年第2期197-202,共6页
Monodisperse crosslinked poly(chloromethylstyrene-co-divinylbenzene)(poly(CMSt-co-DVB))microsphereswere prepared by distillation-precipitation copolymerization of chloromethylstyrene(CMSt)and divinylbenzene(DVB)inneat... Monodisperse crosslinked poly(chloromethylstyrene-co-divinylbenzene)(poly(CMSt-co-DVB))microsphereswere prepared by distillation-precipitation copolymerization of chloromethylstyrene(CMSt)and divinylbenzene(DVB)inneat acetonitrile.The polymer particles had clean surfaces due to the absence of any added stabilizer.The size of the particlesranges from 2.59 μm to 3.19 μm and with mono-dispersity around 1.002-1.014.The effects of monomer feed incopolymerization on the microsphere formation were described.The polymer microspheres were characterized by SEM andchlorinity elemental analysis. 展开更多
关键词 Chloromethylstyrene DIVINYLBENZENE Distillation-precipitation polymerization CROSSLINKED MONODISPERSE polymer microspheres Chlorinity.
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A MORPHOLOGICAL STUDY OF POLY(DIVINYLBENZENE-co-ACRYLIC ACID) IN CROSSLINKING PRECIPITATION POLYMERIZATION 被引量:1
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作者 杨新林 黄文强 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2006年第2期163-171,共9页
Divinylbenzene-80 (DVB-80) and polar monomer acrylic acid (AA) having hydrogen bonding at a total monomer loading of 5 vol% were precipitated-copolymerized in a variety of organic solvents with 2,2'-azobis(isobu... Divinylbenzene-80 (DVB-80) and polar monomer acrylic acid (AA) having hydrogen bonding at a total monomer loading of 5 vol% were precipitated-copolymerized in a variety of organic solvents with 2,2'-azobis(isobutyronitrile) (AIBN) as initiator. The experiments were investigated from a two-dimensional matrix, i.e., the actual crosslinking degree of DVB varying from 0 to 80% and the solvent composition varying from 0 to 100% of toluene mixture with acetonitrile, when the mixture of acetonitrile and toluene was used as the reaction solvent. Under various reaction conditions, six distinct morphologies including soluble polymers, swellable microgels, coagulum, irregular microparticles, and nano-/micrometer microspheres were formed and the structures of these polymer architectures were described. A morphological map was utilized to discuss the effects of both crosslinking degree of DVB and composition of solvent on the transitions between morphology domains. The results demonstrated that the microspheres are formed by an internal contraction due to the marginal solvency of the continuous phase and the crosslinking of the polymer network through the covalent bonding from DVB as well as the interchain hydrogen-bonding between the carboxylic acid units. 展开更多
关键词 precipitation-polymerization DIVINYLBENZENE Acrylic acid Morphology Solvent effect Hydrogen bonding
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PREPARATION OF POLY(ETHYLENEGLYCOL-co-ACRYLIC ACID) MICROSPHERES WITH DIVINYLBENZNE AS CROSSLINKER BY DISTILLATION-PRECIPITATION POLYMERIZATION 被引量:1
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作者 杨新林 黄文强 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2007年第3期303-309,共7页
Monodisperse poly(poly(ethyleneglycol) methyl ether acrylate-co-acrylic acid) (poly(PEGMA-co-AA)) microspheres were prepared by distillation-precipitation polymerization with divinylbenzene (DVB) as crosslin... Monodisperse poly(poly(ethyleneglycol) methyl ether acrylate-co-acrylic acid) (poly(PEGMA-co-AA)) microspheres were prepared by distillation-precipitation polymerization with divinylbenzene (DVB) as crosslinker with 2,2'- azobisisobutyronitrile (AIBN) as initiator in neat acetonitrile without stirring. Under various reaction conditions, four distinct morphologies including the sol, microemulsion, microgels and microspheres were formed during the distillation of the solvent from the reaction system. A 2D morphological map was established as a function of crosslinker concentration and the polar monomer AA concentration, in comonomer feed in the transition between the morphology domains. The effect of the covalent crosslinker DVB on the morphology of the polymer network was investigated in detail at AA fraction of 40 vol%. The ratios of acid to ethylene oxide units presenting in the comonomers dramatically affected the polymer-polymer interaction and hence the morphology of the resultant polymer network. The covalent crosslinking by DVB and the hydrogen bonding crosslinking between two acid units as well as between the acid and ethylene oxide unit played key roles in the formation of monodisperse polymer microspheres. 展开更多
关键词 Distillation-precipitation polymerization Monodisperse microspheres DIVINYLBENZENE Poly(ethyleneglycol) methyl ether acrylate Acrylic acid Hydrogen bonding.
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Synthesis of Ultra-High-Molecular-Weight Polyethylene by Transition-Metal-Catalyzed Precipitation Polymerization
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作者 Wenbing Wang Quan Wang +1 位作者 Chen Zou Changle Chen 《Precision Chemistry》 2024年第2期63-69,共7页
Ultra-high-molecular-weight polyethylene(UHMWPE)plays an important role in many important fields as engineering plastics.In this contribution,a precipitation polymerization strategy is developed by combination of high... Ultra-high-molecular-weight polyethylene(UHMWPE)plays an important role in many important fields as engineering plastics.In this contribution,a precipitation polymerization strategy is developed by combination of highly active phosphino-phenolate nickel catalysts with polymer-insoluble solvent(heptane)to access UHMWPE(Mn up to 8.3×10^(6)g mol^(-1))with good product morphology,free-flowing characteristics,and great mechanical properties.Compared with the academically commonly used aromatic solvent(toluene),the utilization of heptane offers simultaneous enhancement in important parameters including activity,polymer molecular weight,and catalyst thermal stability.This system can also generate polar functionalized UHMWPE with molecular weight of up to 1.6×10^(6)g mol^(-1)in the copolymerization of ethylene with polar comonomers.More importantly,this precipitation polymerization strategy is generally applicable to several representative transition metal catalyst systems,leading to UHMWPE synthesis with good product morphology control. 展开更多
关键词 transition metal catalysts POLYOLEFIN UHMWPE precipitation polymerization polar monomer
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Synthetic Features and Mechanism for the Preparation of Vinyl Chloride-co-Butyl Acrylate-co-Vinyl Acetate Terpolymer via Precipitation Polymerization 被引量:1
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作者 Chang-Tong Song Xian-Hong Zhang +2 位作者 Dong Chen Yu-Hong Ma Wan-Tai Yang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2023年第11期1714-1724,I0006,共12页
Without any type of su rfactant or dispersing agent,precipitation polymerization has great superiorities in both polymer synthesis and applications.In the present work,the polymerization of vinyl chloride(VC),n-butyl ... Without any type of su rfactant or dispersing agent,precipitation polymerization has great superiorities in both polymer synthesis and applications.In the present work,the polymerization of vinyl chloride(VC),n-butyl acrylate(BA),and vinyl acetate(VAc)are conducted in the precipitation polymerization system and series of their random terpolymers poly(vinyl chloride-co-n-butyl acrylate-co-vinyl acetate)(PCBV)are synthesized successfully.The effects of various polymerization conditions,including solvent polarity,temperature,initiator concentration,and monomer feed ratios on the polymerization kinetics,number-average molecular weight(M_(n)),and terpolymer composition are investigated systematically.The solvent and the monomer feed ratio are crucial factors not only for the polymer morphology,but also for the reaction kinetic.In the non-polar solvent such as n-hexane,the PCBV displays particle morphology when the composition of BA ratio lower than 10 wt%.Otherwise,the PCBV forms a uniform polymer phase and precipitates out from the mixture.In the polar solvent,e.g.,dimethyl carbonate(DMC)and ethanol,the PCBV polymer maintains a slurry state either in low or in high monomer feed ratio.Impressively,VC based ternary copolymer that obtained in n-hexane has much lower M_(n)(<20 kDa)and much higher BA units mass fraction(>40 wt%)compared with emulsion and suspension polymerization.Additionally,the terpolymer can be easily sepa rated by simple centrifugation. 展开更多
关键词 precipitation polymerization COpolymerization Vinyl chloride Low molecular weight
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羧基功能化交联共聚物微球的制备及其对亚甲基蓝的吸附性能
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作者 罗菊香 赖槐东 +1 位作者 金林海 程德书 《塑料工业》 CAS CSCD 北大核心 2024年第8期51-58,共8页
以二乙烯苯(DVB)为交联剂,α-甲基苯乙烯(AMS)、马来酸酐(MAH)为单体,通过自稳定沉淀聚合原位制备α-甲基苯乙烯-马来酸酐交联共聚物微球(PAMSM),PAMSM与氢氧化钠反应后,转化为羧基功能化的交联共聚物微球(PAMSM-COOH)。对微球的结构进... 以二乙烯苯(DVB)为交联剂,α-甲基苯乙烯(AMS)、马来酸酐(MAH)为单体,通过自稳定沉淀聚合原位制备α-甲基苯乙烯-马来酸酐交联共聚物微球(PAMSM),PAMSM与氢氧化钠反应后,转化为羧基功能化的交联共聚物微球(PAMSM-COOH)。对微球的结构进行了表征,研究了PAMSM-COOH微球对亚甲基蓝(MB)的吸附性能以及吸附剂循环利用效果。扫描式电子显微镜(SEM)分析表明,微球表面光滑,具有良好的球形度并且粒径均一。在MB初始质量浓度为200 mg/L,吸附剂用量为0.50 g/L,溶液pH值为7,吸附温度为313 K,吸附时间为4 h,PAMSM-COOH对MB的最大吸附容量为261 mg/g。微球吸附MB的动力学和等温数据分别符合拟二阶模型和Langmuir等温模型,微球吸附MB为自发进行的吸热过程。5次吸附-脱附循环实验表明微球对MB的去除率保持在85.0%以上。 展开更多
关键词 共聚物微球 α-甲基苯乙烯-马来酸酐共聚物 自稳定沉淀聚合 亚甲基蓝 吸附
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赤泥用于酸性含锰废水中锰的净化研究
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作者 阎丽 陈冬素 《矿冶工程》 CAS 北大核心 2024年第4期237-240,共4页
采用还原焙烧-磁选预处理赤泥,得到非磁性物;非磁性物经煅烧、盐酸溶出后加入饱和偏铝酸钠聚合剂聚合后过滤、熟化制备聚合氯化铝(PAC)基液;使用该PAC基液,在沉降时间5 h、PAC基液与废水体积比1∶120、搅拌转速140 r/min、pH值8、反应温... 采用还原焙烧-磁选预处理赤泥,得到非磁性物;非磁性物经煅烧、盐酸溶出后加入饱和偏铝酸钠聚合剂聚合后过滤、熟化制备聚合氯化铝(PAC)基液;使用该PAC基液,在沉降时间5 h、PAC基液与废水体积比1∶120、搅拌转速140 r/min、pH值8、反应温度30℃、聚丙烯酰胺(PAM)投加量20 mg/L条件下处理含锰酸性废水,处理后液中锰质量浓度由325.3 mg/L降至1.5 mg/L,锰去除率达99.5%,净化后液中锰质量浓度达到国家一级排放标准。 展开更多
关键词 废水处理 絮凝沉淀法 含锰酸性废水 赤泥 非磁性物 聚合氯化铝 聚丙烯酰胺
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环状对苯二甲酸乙二醇酯低聚体的沉淀分离提纯与开环聚合
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作者 高倩倩 王松林 +2 位作者 刘明 李院院 包永忠 《化学反应工程与工艺》 CAS 2024年第3期217-225,共9页
通过低溶液浓度下聚对苯二甲酸乙二醇酯(PET)的解聚成环(CDP)反应可制备环状对苯二甲酸乙二醇酯低聚体(CET),但解聚粗产物组成复杂,影响CET高值化应用。本研究对PET解聚产物进行选择性沉淀分离提纯,研究了沉淀温度、沉淀剂种类等对CET... 通过低溶液浓度下聚对苯二甲酸乙二醇酯(PET)的解聚成环(CDP)反应可制备环状对苯二甲酸乙二醇酯低聚体(CET),但解聚粗产物组成复杂,影响CET高值化应用。本研究对PET解聚产物进行选择性沉淀分离提纯,研究了沉淀温度、沉淀剂种类等对CET收率的影响,并考察了纯化CET的热性能和开环聚合行为。结果表明:以乙醇为沉淀剂时,选择性沉淀得到的CET中线性低聚物和催化剂残留量随温度降低而减少,沉淀温度为30℃时线性低聚物和催化剂残留量较低;以正己烷等饱和烷烃为沉淀剂,沉淀温度为30℃时,可得到不含线性低聚物组分的CET,且以正己烷为沉淀剂,CET收率最高(72.69%)。纯化CET在不加催化剂或添加1%(质量分数)三氧化二锑催化剂、320℃下开环聚合8 min,可分别制得特性黏数为0.56 dL/g和0.64 dL/g的PET。 展开更多
关键词 聚对苯二甲酸乙二醇酯 解聚成环 环状对苯二甲酸乙二醇酯 选择性沉淀 开环聚合
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基于MOFs的Pb(Ⅱ)离子印迹聚合物的制备及性能研究
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作者 胡斌 洪玉文 +3 位作者 付冬雪 罗甘滨 赵莉 成会玲 《云南大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第6期1111-1119,共9页
以Pb(Ⅱ)为模板离子,采用沉淀聚合法,以Fe_(3)O_(4)/MIL101(Cr)为金属有机框架材料(MOFs),乙二醇二甲基丙烯酸酯为交联剂,对MOFs、功能单体、交联剂的用量以及致孔溶剂的种类等实验条件进行优化,制备了一系列Pb(Ⅱ)印迹聚合物[Pb(Ⅱ)-II... 以Pb(Ⅱ)为模板离子,采用沉淀聚合法,以Fe_(3)O_(4)/MIL101(Cr)为金属有机框架材料(MOFs),乙二醇二甲基丙烯酸酯为交联剂,对MOFs、功能单体、交联剂的用量以及致孔溶剂的种类等实验条件进行优化,制备了一系列Pb(Ⅱ)印迹聚合物[Pb(Ⅱ)-IIPs]及相应的非印迹聚合物(NIPs).结合扫描电镜(SEM)、氮气吸附/脱附(BET)、等温吸附实验、动力学吸附实验等,对较优实验条件下制备的Pb(Ⅱ)-IIP_(8)和NIP_(8)进行结构表征和性能研究.结果表明,Pb(Ⅱ)-IIP_(8)对Pb(Ⅱ)离子具有较大的吸附容量和较高的印迹因子,有望成为一种新型Pb(Ⅱ)离子吸附分离材料. 展开更多
关键词 Pb(Ⅱ)离子 金属有机框架材料 沉淀聚合法 离子印迹聚合物
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配体辅助Ni(Ⅱ)离子印迹材料的制备及性能
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作者 付冬雪 赵莉 +2 位作者 姚星月 王琪 成会玲 《化学工程》 CAS CSCD 北大核心 2024年第4期35-39,88,共6页
采用沉淀聚合法,以Ni(Ⅱ)离子为模板离子,邻氨基吡啶为配体,丙烯酰胺为功能单体,系统优化印迹条件,制备一系列Ni(Ⅱ)离子印迹聚合物Ni(Ⅱ)-IIP_(1-20)及相应的非印迹聚合物Ni(Ⅱ)-NIP_(1-20)。采用SEM(扫描电镜)、FT-IR(红外光谱)等对... 采用沉淀聚合法,以Ni(Ⅱ)离子为模板离子,邻氨基吡啶为配体,丙烯酰胺为功能单体,系统优化印迹条件,制备一系列Ni(Ⅱ)离子印迹聚合物Ni(Ⅱ)-IIP_(1-20)及相应的非印迹聚合物Ni(Ⅱ)-NIP_(1-20)。采用SEM(扫描电镜)、FT-IR(红外光谱)等对较优条件下制备的Ni(Ⅱ)-IIP_(3)及Ni(Ⅱ)-NIP_3进行结构表征,通过动力学吸附实验和等温吸附实验等进一步探究其吸附行为。结果表明:Ni(Ⅱ)-IIP_3对Ni(Ⅱ)离子的平衡吸附量达109.48 mg/g,印迹因子为3.70,是典型的介孔材料。其表面存在吸附Ni(Ⅱ)离子的特异性印迹孔穴,吸附行为更符合准二级动力学模型和Freundlich等温吸附模型。此外,在“竞争离子”Co(Ⅱ)离子存在的条件下,Ni(Ⅱ)-IIP_3对Ni(Ⅱ)离子仍具有较强的吸附能力和良好的吸附选择性,是一种性能优异的新型吸附材料。 展开更多
关键词 Ni(Ⅱ)离子 沉淀聚合法 离子印迹聚合物 邻氨基吡啶
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基于双功能单体的Ni(Ⅱ)离子印迹复合膜的制备及性能研究
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作者 洪玉文 汪鑫 +3 位作者 付冬雪 王贵芳 罗甘滨 成会玲 《化工新型材料》 CAS CSCD 北大核心 2024年第2期91-97,共7页
采用沉淀聚合法,以Ni(Ⅱ)离子为模板离子,α-甲基丙烯酸和N-异丙基丙烯酰胺为双功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,通过正交试验设计,对制备Ni(Ⅱ)离子印迹复合膜的实验条件进行系统优化,制备了16种Ni(Ⅱ)离... 采用沉淀聚合法,以Ni(Ⅱ)离子为模板离子,α-甲基丙烯酸和N-异丙基丙烯酰胺为双功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,通过正交试验设计,对制备Ni(Ⅱ)离子印迹复合膜的实验条件进行系统优化,制备了16种Ni(Ⅱ)离子印迹复合膜[Ni(Ⅱ)-IICMs]和相应的非印迹复合膜(NICMs),得出制备Ni(Ⅱ)-IICMs的较优实验条件。采用平衡吸附实验对Ni(Ⅱ)-IICMs和NICMs进行吸附量和印迹因子评价,结果表明:在较优实验条件下制备的Ni(Ⅱ)-IICM_(8),平衡吸附量为1.286mmol/g,印迹因子为1.737。采用红外光谱、扫描电镜、氮气吸附/脱附等手段对Ni(Ⅱ)-IICM_(8)和相应NICM_(8)的内部结构及表面形貌进行表征。使用动力学吸附和等温吸附实验对Ni(Ⅱ)-IICM_(8)和NICM_(8)的吸附行为进行研究,结果表明:Ni(Ⅱ)-IICM_(8)对Ni(Ⅱ)离子的吸附,在较短时间内即可快速达到吸附平衡,且在不同浓度的溶液中都有较好的吸附效果。在不同温度下,探究Ni(Ⅱ)-IICM_(8)的吸附行为,结果表明Ni(Ⅱ)-IICM_(8)具有良好的“温度响应性”。综上所述,说明实验研究制备的Ni(Ⅱ)-IICM_(8),有望用于实际样品中Ni(Ⅱ)离子的分离和去除。 展开更多
关键词 沉淀聚合法 Ni(Ⅱ)离子 双功能单体 离子印迹复合膜 温度响应性
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氧化锌烟尘浸出过程硅锗沉淀高效分散解聚研究
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作者 刘殿传 柴伟 《有色金属(冶炼部分)》 CAS 北大核心 2024年第5期91-99,共9页
在高新技术对锗需求日益增长的背景下,基于对烟尘浸出渣中锗赋存状态的考察,查明了硅锗聚合沉淀机制,及超声诱导锗硅沉淀高效分散解聚机制。采用相关性分析等首次为锗硅聚合沉淀猜想提供实质性证据,Ge-Si相关性系数k为66.57,相关性拟合... 在高新技术对锗需求日益增长的背景下,基于对烟尘浸出渣中锗赋存状态的考察,查明了硅锗聚合沉淀机制,及超声诱导锗硅沉淀高效分散解聚机制。采用相关性分析等首次为锗硅聚合沉淀猜想提供实质性证据,Ge-Si相关性系数k为66.57,相关性拟合度R 2高达97.99%。在含锗氧化锌烟尘浸出过程中,溶液中硅离子会聚合形成硅酸胶体吸附溶液中的锗,引起锗损失14.81%,造成锗工业回收率低。超声引入浸出过程后,会在溶液中会产生空化气泡,发生空化作用,空化气泡破裂时释放的能量形成局部的高温高压并产生冲击波与微射流,会持续不断冲击聚硅酸胶体表面,使得聚硅酸胶体比表面积增大58.19%,孔径增大666.32%,孔容增大165.79%,使得大颗粒的硅胶解聚为小颗粒的低聚硅酸,降低硅胶对锗的吸附,超声条件下锗损失降低了59.35%。研究建立的氧化锌烟尘浸出过程硅-锗沉淀高效分散解聚,可有效实现氧化锌烟尘中锗高效回收。 展开更多
关键词 聚合沉淀 相关度 超声 机制
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工厂化海水养殖尾水中活性磷酸盐混凝沉淀去除研究
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作者 倪琳琳 卢洋 +4 位作者 刘恒明 冯诗雨 谷晶 杨国军 王华 《中国渔业质量与标准》 2024年第2期14-21,共8页
本研究采用基于聚合硫酸铁(PFS)的混凝沉淀除磷工艺,构建了混凝沉淀除磷装置,并将其应用于红鳍东方鲀(Takifugu rubripes)工厂化海水养殖尾水中活性磷酸盐的去除。结果表明,化学混凝沉淀方法可有效去除海水养殖尾水中的活性磷酸盐,PFS... 本研究采用基于聚合硫酸铁(PFS)的混凝沉淀除磷工艺,构建了混凝沉淀除磷装置,并将其应用于红鳍东方鲀(Takifugu rubripes)工厂化海水养殖尾水中活性磷酸盐的去除。结果表明,化学混凝沉淀方法可有效去除海水养殖尾水中的活性磷酸盐,PFS的最适投加量为55 mg/L,红鳍东方鲀工厂化海水养殖尾水中COD Mn浓度不影响水中活性磷酸盐的去除效果,尾水盐度的下降和除磷装置流量控制均有利于尾水中活性磷酸盐的去除。当红鳍东方鲀工厂化养殖尾水中活性磷酸盐的初始浓度为0.254 mg/L时,除磷装置的流量控制在100 L/h时,180 min后尾水中磷的去除率达到78.7%,出水中活性磷酸盐的残留浓度已降至0.054 mg/L,满足海水养殖尾水排放要求。本研究可为化学混凝沉淀除磷工艺在工厂化海水养殖尾水处理中的实际应用提供参考。 展开更多
关键词 红鳍东方鲀 养殖尾水 除磷 混凝沉淀 聚合硫酸铁
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Preparation of Ultralow Molecular Weight Poly(vinyl chloride) with Submicrometer Particles via Precipitation Polymerization 被引量:2
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作者 Peng Cui Chang-Tong Song +3 位作者 Xian-Hong Zhang Dong Chen Yu-Hong Ma Wan-Tai Yang 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2019年第7期646-653,共8页
Poly(vinyl chloride), with ultralow molecular weight, produced by free radical polymerization either at high temperature or in the presence of chain transfer agents, is widely used as special resins and polymer proces... Poly(vinyl chloride), with ultralow molecular weight, produced by free radical polymerization either at high temperature or in the presence of chain transfer agents, is widely used as special resins and polymer process additives. This paper reports a new process, called self-stabilized precipitation polymerization, in which the polymerization of vinyl chloride monomer (VCM) is conducted in hydrocarbon diluents without addition of any suspending agent or emulsifier. The merits of this novel strategy include:(1) PVC resins with ultra-low number-average molecular weight (Mn) from 4000 to 15000, which is much lower than Mn of those prepared by conventional suspension and emulsion polymerizations,(2) sub-micrometer PVC particles with near spherical morphology, and (3) the very simple post-polymerization separation process. Under mild stirring, polymerization proceeds stably and smoothly. The influences of main process factors, such as solvents, initiator and monomer concentrations, polymerization time, and temperature on both particle morphology and Mn of the polymer products are investigated systematically. The molar ratio of-CH2-CHCl-/-CH=CH-CH2CHCl, a good indicator of structural defects, is about 1000/0.1 which means the low molecular weights do not result from chain transfer to the monomers. Then the mechanism of this polymerization is proposed. In summary, this novel polymerization technology provides a straightforward method for preparing PVC particulate products with low Mn. 展开更多
关键词 precipitation polymerization VINYL CHLORIDE ULTRALOW molecular WEIGHT PURE product
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Microspheres Sensor Based on Molecularly Imprinted Polymer Synthesized by Precipitation Polymerization 被引量:2
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作者 张朝晖 龙玉梅 +1 位作者 刘英菊 姚守拙 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2003年第5期550-555,共6页
A new biomimetic bulk acoustic wave sensor based on molecularly imprinted microspheres (MUM) technique was described. The sensing materials were synthesized by precipitation polymerization. By using the Scatchard anal... A new biomimetic bulk acoustic wave sensor based on molecularly imprinted microspheres (MUM) technique was described. The sensing materials were synthesized by precipitation polymerization. By using the Scatchard analysis, the equilibrium dissociation constant K-D and the apparent maximum number Q(max) of the binding sites were calculated to be 3.70 mmol (.) L-1 and 9.11 mumol (.) g(-1), respectively. The sensor exhibited a sensitive response to the template compound (dipyridamole) in liquid phase with a detection Unfit of 2 x 10(-9) mol (.) L-1. The recoveries of the sensor were 95.1%-105.4%. Studies presented in this paper show that the stability of this sensor is excellent. The sensor has been applied successfully to the determination of dipyridamole in human urine. 展开更多
关键词 microspheres sensor molecularly imprinted polymer DIPYRIDAMOLE precipitation polymerization
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Preparation of slightly crosslinked monodisperse poly(maleic anhydride-cyclohexyl vinyl ether-divinylbenzene)functional microspheres with anhydride groups via precipitation polymerization 被引量:2
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作者 Cen Yin Anhou Xu +3 位作者 Li Gong Luqing Zhang Bing Geng Shuxiang Zhang 《Particuology》 SCIE EI CAS CSCD 2015年第2期99-106,共8页
Slightly crosslinked monodisperse poly(maleic anhydride-cyclohexyl vinyl ether-divinylbenzene) (MA-CHVE-DVB) microspheres were prepared via precipitation polymerization while using 2,2- azobisisobutyronitrile as a... Slightly crosslinked monodisperse poly(maleic anhydride-cyclohexyl vinyl ether-divinylbenzene) (MA-CHVE-DVB) microspheres were prepared via precipitation polymerization while using 2,2- azobisisobutyronitrile as an initiator in a mixture of methyl ethyl ketone and n-heptane without any stabilizer. The number-average diameter of the resultant poly(MA-CHVE-DVB) microspheres ranged from 0.478 to 1.386 μm with a polydispersity index of 1.00 to 1.02 that depended on the feed ratios of the MA/CHVE/DVB monomers. The introduction of one electron donor monomer cyclohexyl vinyl ether strongly affected the yield, size, and morphology of these slightly crosslinked microspheres. Quinoline- type chelating resins were obtained after combining the poly(MA-CHVE-DVB) with 8-hydroxyquinoline; the adsorption properties of these materials were measured through their ability to remove Cu^2+ ions from water. The poly(MA-CHVE-DVB) microspheres with low degrees of crosslinking provided more effective functional groups and therefore better ion removal capabilities. These slightly crosslinked microspheres may have applications in water treatment as well as in sensing and drug delivery. 展开更多
关键词 precipitation polymerization Crosslinked functional microspheres Cyclohexyl vinyl ether Maleic anhydride DIVINYLBENZENE
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