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SYNTHESIS AND CHARACTERIZATION OF A NEW COMBLIKE POLYMER BASED ON POLY (VINYL METHYL ETHER-ALT-MALEIC ANHYDRIDE) BACKBONE
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作者 丁黎明 林云青 +2 位作者 周子南 倪建龙 陈东霖 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1995年第3期264-272,共9页
A new comblike polymer host for polymer electrolyte was synthesized by reacting monomethyl ether of poly(ethylene glycol) with poly(vinyl methyl ether-alt-maleic anhydride) and endcapping the residual carboxylic acid ... A new comblike polymer host for polymer electrolyte was synthesized by reacting monomethyl ether of poly(ethylene glycol) with poly(vinyl methyl ether-alt-maleic anhydride) and endcapping the residual carboxylic acid with methanol. Butanone was selected as a solvent for the esterification in order to obtain a completely soluble product. The synthesis process was traced through by LR. Compared with the model compounds, the presumed structure of this comblike polymer has been proved to be valid by C-13 NMR The comb polymer is a white rubbery solid. It can be dissolved in butanone and THF, and manifests good film forming ability. 展开更多
关键词 COMB-LIKE polyMER poly (vinyl methyl ether-ALT-MALEIC ANHYDRIDE) ESTERIFICATION polyMER ELECTROLYTES IR SPECTRA C-13 NMR SPECTRA
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Theoretical Studies on the Kinetics and Mechanisms of Reactions for Methyl Vinyl Ether and Ozone 被引量:1
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作者 Bo Long Ming-qiang Huang +1 位作者 Zhen-ya Wang Wei-jun Zhang 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2008年第4期324-332,共9页
The interconversion between the two distinct isomers of methyl vinyl ether (MVE), the formation of the primary ozonides from O3-initated reactions of MVE, the transformation between the primary ozonides, and the sub... The interconversion between the two distinct isomers of methyl vinyl ether (MVE), the formation of the primary ozonides from O3-initated reactions of MVE, the transformation between the primary ozonides, and the subsequent fragmentation were studied using quantum chemical methods at the BHandHLYP/6311++G(d,p) level of theory for optimized geometries and frequency calculations and at the QCISD/631G(d,p) level for the single point energy calculations. The rate coefficients were calculated for the temperature range 280-440 K by using the canonical transition state theory (TST). For ozone addition to MVE, there are two different possibilities discussed on the basis of two different possible orientations for ozone attack. The results of the theoretical study indicate that although the synperiplanar-MVE is 7.11 kJ/mol more stable than the antiperiplanar-MVE, the antiperiplanar-MVE plays a more important role in formation of the primary ozonides because the primary ozonides formed from the ozone addition antiperiplanar-MVE are more stable and the energy barriers corresponding to transition states are lower. The intereonversion between the primary ozonides formed from the ozone addition to antiperiplanar-MVE is the most accessible compared with the transformations between other primary ozonides. The cleavage of the primary ozonides mainly leads to the formation of the CH2OO, which is in agreement with the experimental estimates. The calculated overall rate constant for the ozone-initiated reactions is 4.8× 10^-17 cm^3/(molecule.s) at 298.15 K, which agrees with the experimental value for ethyl vinyl ether. 展开更多
关键词 methyl vinyl ether OZONE Reaction pathway Primary ozonide INTERCONVERSION Rate constant Transition state theory
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Synthesis and properties of soluble poly(aryl ether sulfone ether ketone)s copolymers containing pendant methyl groups 被引量:1
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作者 ZHONG Ming YU Wen-wen SONG Cheng LIU Yong-jun SONG Cai-sheng 《Journal of Chemistry and Chemical Engineering》 2009年第4期26-31,38,共7页
A series of Poly(arly ether sulfone ether ketone)s containing pendant methyl groups were synthesized by the reaction of 4,4'-[sulfonylbis (1,4-phenylene)dioxy] dibenzoyl chloride (SODBC) with 4,4'- diphenoxy d... A series of Poly(arly ether sulfone ether ketone)s containing pendant methyl groups were synthesized by the reaction of 4,4'-[sulfonylbis (1,4-phenylene)dioxy] dibenzoyl chloride (SODBC) with 4,4'- diphenoxy diphenylsulfone (DPODPS), 4,4'- di(2-methylphenoxy) diphenylsulfone (o-Me-DPODPS), 4,4'- di(3-methylphenoxy) diphenylsulfone (m-Me-DPODPS), 4,4'- di (2,6-bimethylphenoxy) biphenylsulfone(o-Me2-DPODPS) respectively, in a mixture of 1,2-dichloroethane (DCE) and N-methylpyrrolidone (NMP). These reactions were catalyzed by anhydrous aluminum chloride (AlCl). The characteristic of copolymers were studied by means of advanced analytical techniques such as FT-IR,1H-NMR, DSC, TGA and WAXD. The results show glass transition temperature (Tg) in the range of 193-206℃, thermally stable in excess of 434℃ and excellent solubility in polar solvents. Methyl-substituted Poly(aryl ether sulfone ketone)s had higher glass transition temperatures, lower initial decomposition temperatures than the unsubstituted ones. 展开更多
关键词 poly (aryl ether sulfone ether ketone)s characterization SOLUBLE pendent methyl groups
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POLYMERIZATION OF ISOBUTYL VINYL ETHER CATALYSED BY DINUCLEAR HALF-TITANOCENES
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作者 Nguyen Thi Le Thanh Seok Kyun Noh +1 位作者 Won Seok Lyoo Dong-Ho Lee 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2008年第5期611-620,共10页
Polymerization of isobutyl vinyl ether(IBVE)has been studied with mononuclear half-titanocene,CpTiCl_3[1]and dinuclear half-titanocenes,[(C_5H_4)_2(CH_2)_n][(TiCl_3)_2][2(n=3),3(n=6)],and[(C_5H_4)_2(CH_2)_n[(TiCl_2OR_... Polymerization of isobutyl vinyl ether(IBVE)has been studied with mononuclear half-titanocene,CpTiCl_3[1]and dinuclear half-titanocenes,[(C_5H_4)_2(CH_2)_n][(TiCl_3)_2][2(n=3),3(n=6)],and[(C_5H_4)_2(CH_2)_n[(TiCl_2OR_2](R=2,6- diisopropylphenoxyl)[4(n=3),5(n=6)],in the presence of methyl aluminoxanes(MAO)as cocatalyst in methylene chloride.The influences of the length of polymethylene brigde and the substitution of aryloxy group at the metal center have been investigated at three polymerization temperature(... 展开更多
关键词 Dinuclear half-titanocene poly(isobutyl vinyl ether) vinyl ether polymerization by metallocene Stereoregularity control by metallocene.
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COMPATIBILITY IN POLYMER BLENDS OF POLY (VINYL ACETATE) AND POLY (METHYL METHACRYLATE)STUDIED BY NMR
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作者 宋默 戴莹坤 +2 位作者 胡澄 黄玉惠 丛广民 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1992年第2期176-179,共4页
Compatibility of poly (vinyl acetate) (PVAc) with poly (methyl methacrylate) (PMMA) mixtures has been studied by using nuclear magnetic relaxation, differential scanning calorimeter and small-angle X-ray scattering te... Compatibility of poly (vinyl acetate) (PVAc) with poly (methyl methacrylate) (PMMA) mixtures has been studied by using nuclear magnetic relaxation, differential scanning calorimeter and small-angle X-ray scattering techniques. The nuclear magnetic relaxation time T_1's were measured as a function of composition in blends of PMMA and PVAc prepared from chloroform solution. The results show that the system is miscible for casting from chloroform solution. 展开更多
关键词 polymer blends ~1H nuclear magnetic relaxation poly (vinyl acetate) poly (methyl methacrylate)
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Synthesis and Adsorption Property of Two Polymeric Adsorbents with Pendent Ether Bonds 被引量:4
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作者 JianGouHUANG ManCaiXU +1 位作者 HaiTaoLI ZuoQingSHI 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第9期914-916,共3页
Two polymeric adsorbents, poly(methyl p-vinylbenzyl ether) and poly(phenyl p-vinylbenzyl ether), were synthesized from chloromethylated polystyrene. Their adsorption property for phenol in hexane solution was investig... Two polymeric adsorbents, poly(methyl p-vinylbenzyl ether) and poly(phenyl p-vinylbenzyl ether), were synthesized from chloromethylated polystyrene. Their adsorption property for phenol in hexane solution was investigated. The results showed that the two adsorbents adsorb phenol from hexane solution through hydrogen-bonding and π-π stacking interaction. 展开更多
关键词 poly(methyl p-vinylbenzyl ether) poly(phenyl p-vinylbenzyl ether) adsorption HYDROGEN-BONDING π-π stacking interaction.
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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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甲基双酚类单体共聚-溴化-羧化法制备羧基化聚醚醚酮
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作者 陈俊俊 段金汤 +2 位作者 张才亮 顾雪萍 冯连芳 《化学反应工程与工艺》 CAS 2024年第2期150-159,共10页
针对2,5-二羟基甲苯、对苯二酚和4,4’-二氟二苯甲酮共聚反应进行研究。结果表明,随着固含量、反应温度以及碱金属碳酸盐中碳酸钾比例的增加,产物含甲基的聚醚醚酮(PEEK-CH_(3))的分子量分布先降低后增加,其最佳反应条件:固含量为25%,... 针对2,5-二羟基甲苯、对苯二酚和4,4’-二氟二苯甲酮共聚反应进行研究。结果表明,随着固含量、反应温度以及碱金属碳酸盐中碳酸钾比例的增加,产物含甲基的聚醚醚酮(PEEK-CH_(3))的分子量分布先降低后增加,其最佳反应条件:固含量为25%,缩聚温度为200℃,碱金属碳酸盐与双酚单体物质的量比为1.05:1,碱金属碳酸盐中碳酸钠与碳酸钾的物质的量比为19:1,反应时间为3.5 h。PEEK-CH_(3)溴化反应中二溴取代产物(PEEK-CHBr_(2))最为重要,在液溴用量为—CH_(3)摩尔当量的20倍、反应温度为160℃、365 nm长波紫外线光照下反应2 h后,PEEK-CHBr_(2)占比达到95.8%。最后,通过次氯酸钠氧化PEEK-CHBr_(2),成功制备了数均分子量为4.6×10^(4)、特性黏度为1.5 dL/g的羧基化聚醚醚酮,其水接触角从未改性的PEEK的133.9°降至29.9°。 展开更多
关键词 聚醚醚酮 甲基 溴化 羧基化
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磺化聚乙烯醇/侧链磺化聚芳醚酮交联复合膜的制备与性能
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作者 程海龙 韩康辉 +5 位作者 孙娇娇 郑锐 李奥 栾立伟 管丹丹 陶璐静 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2024年第4期147-156,共10页
通过溶液共混热处理方法,制备了磺化聚乙烯醇(SPVA)含量不同的SPVA/侧链磺化聚芳醚酮交联复合膜(Cr-SSPxx)。交联网络结构有效增强了交联复合膜的力学性能、热稳定性、氧化稳定性及尺寸稳定性,扫描电镜显示,交联复合膜呈现了更好的相容... 通过溶液共混热处理方法,制备了磺化聚乙烯醇(SPVA)含量不同的SPVA/侧链磺化聚芳醚酮交联复合膜(Cr-SSPxx)。交联网络结构有效增强了交联复合膜的力学性能、热稳定性、氧化稳定性及尺寸稳定性,扫描电镜显示,交联复合膜呈现了更好的相容性和均一性。随交联度增加,交联复合膜的溶胀率呈现明显下降趋势,在25℃和80℃时,Cr-SSP30膜的溶胀率分别仅有3.7%和7.6%。由于SPVA对醇有阻碍作用,以及交联网络结构增加了膜的致密性,故该系列Cr-SSPxx膜展现出非常优秀的阻醇性能,交联复合膜的甲醇渗透率明显低于纯S-SPAEK膜和磺化聚乙烯醇/侧链型磺化聚芳醚酮复合膜,Cr-SSP30膜的甲醇渗透率仅为9.4×10^(-8) cm^(2)/s。虽然与磺化聚乙烯醇/侧链型磺化聚芳醚酮复合膜相比,交联复合膜的质子传导率有所降低,但由于独特的侧链磺化结构能够促进质子传导,质子传导率最低的Cr-SSP30膜的传导率在25℃和80℃时也都分别达到了0.034 S/cm和0.065 S/cm,同时表现出了更高的质子选择性,能够满足直接甲醇燃料电池(DMFC)的使用要求,有望在DMFC中得到应用。 展开更多
关键词 侧链型磺化聚芳醚酮 磺化聚乙烯醇 交联复合质子交换膜
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Molecular dynamics simulations of the hydration of poly(vinyl methyl ether):Hydrogen bonds and quasi-hydrogen bonds 被引量:2
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作者 WU RongLiang JI Qing +1 位作者 KONG Bin YANG XiaoZhen 《Science China Chemistry》 SCIE EI CAS 2008年第8期736-742,共7页
Atomistic detailed hydration structures of poly(vinyl methyl ether)(PVME) have been investigated by molecular dynamics simulations under 300 K at various concentrations. Both radial distribution functions and the dist... Atomistic detailed hydration structures of poly(vinyl methyl ether)(PVME) have been investigated by molecular dynamics simulations under 300 K at various concentrations. Both radial distribution functions and the distance distributions between donors and acceptors in hydrogen bonds show that the hydrogen bonds between the polymer and water are shorter by 0.005 nm than those between water molecules. The Quasi-hydrogen bonds take only 7.2% of the van der Waals interaction pairs. It was found the hydrogen bonds are not evenly distributed along the polymer chain,and there still exists a significant amount(10%) of ether oxygen atoms that are not hydrogen bonded to water at a concentration as low as 3.3%. This shows that in polymer solutions close contacts occur not only between polymer chains but also between chain segments within the polymer,which leads to inefficient contacts between ether oxygen atoms and water molecules. Variation of the quasi-hydrogen bonds with the concentration is similar to that of hydrogen bonds,but the ratio of the repeat units forming quasi-hydrogen bonds to those forming hydrogen bonds approaches 0.2. A transition was found in the demixing enthalpy at around 30% measured by dynamic testing differential scanning calorimetry(DTDSC) for aqueous solutions of a mono-dispersed low molecular weight PVME,which can be related to the transition of the fractions of hydrogen bonds and quasi-hydrogen bonds at ~27%. The transition of the fractions of hydrogen bonds and quasi-hydrogen bonds at ~27% can be used to explain the demixing enthalpy transition at 30% at a molecular scale. In addition,at the concentration of 86%,each ether oxygen atom bonded with water is assigned 1.56 water molecules on average,and 'free' water molecules emerge at the concentration of around 54%. 展开更多
关键词 poly(vinyl methyl ether)(PVME) molecular dynamics computer simulation hydrogen BOND quasi-hydrogen BOND
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Application of Ultrasonic Attenuation Measurements in the Studies on Macromolecular Conformational Behaviors——Phase Behavior of the Aqueous Solution of Poly(vinyl methyl ether) Sensitive to Temperature and the Modification of the Behavior by Using Pol 被引量:1
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作者 王公正 房喻 +2 位作者 尚志远 张颖 胡道道 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2004年第1期28-32,共5页
The phase behavior of the aqueous solution of poly(vinyl methyl ether) (PVME) sensitive to temperature and the modification of the behavior by using poly(acrylic acid) (PAA) have been studied by ultrasonic attenuation... The phase behavior of the aqueous solution of poly(vinyl methyl ether) (PVME) sensitive to temperature and the modification of the behavior by using poly(acrylic acid) (PAA) have been studied by ultrasonic attenuation measurements and fluorescence probe techniques. It has been observed that PVME solution is transparent at room temperature and becomes turbid upon heating. The solution turns clear again as soon as the temperature is decreased to room temperature. The heating and cooling process can be repeated for many times. The phase behavior of the solution sensitive to temperature is attributed to the conformational changes of the polymer. PVME may adopt an open coil conformation at room temperature. With this conformation, the polymer is well miscible with the solvent, water, and thereby the system is a real solution. The polymer may adopt a compact coil conformation when the temperature is higher than a specific value, which is called the LCST (the lower critical solution temperature) of PVME. In this case, the polymer tangles to each other and forms various aggregates, which can scatter incident light and ultrasonic waves greatly, resulting in the phase separation. Introduction of PAA decreases the temperature sen-sitivity of the phase behavior of the polymer. The nature of the inhibition is attributed to the complexation of PAA with PVME and the strong hydrophilicity of PAA. Results from fluorescence probe studies are in accordance with those from ultrasonic attenuation measurements, indicating again that the ultrasonic attenuation method can be suc-cessfully used for the qualitative studies of polymer conformations and complexation between polymers. 展开更多
关键词 ultrasonic attenuation CONFORMATION poly(vinyl methyl ether) poly(acrylic acid) COMPLEXATION
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增韧聚氯乙烯电工套管复合材料的制备与性能研究 被引量:2
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作者 赵兴钟 李贝贝 王选伦 《中国塑料》 CAS CSCD 北大核心 2023年第5期48-54,共7页
采用丙烯酸酯橡胶(ACM)、刚性体纳米碳酸钙(nano-CaCO_(3))、弹性体丙烯酸丁酯/甲基丙烯酸甲酯/丁二烯三元共聚物(AMB)作为增韧剂,对聚氯乙烯(PVC)进行复合增韧改性,并对复合材料的冲击性能、拉伸性能、加工流变性、动态热力学性能等进... 采用丙烯酸酯橡胶(ACM)、刚性体纳米碳酸钙(nano-CaCO_(3))、弹性体丙烯酸丁酯/甲基丙烯酸甲酯/丁二烯三元共聚物(AMB)作为增韧剂,对聚氯乙烯(PVC)进行复合增韧改性,并对复合材料的冲击性能、拉伸性能、加工流变性、动态热力学性能等进行了表征。结果表明,当PVC/ACM/nano-CaCO_(3)/AMB质量比为100/10/3/9时,复合材料的常温冲击强度为27.64 kJ/m^(2),比纯PVC提升5倍;低温冲击强度为14.91 kJ/m^(2),比纯PVC提升4.1倍。加入AMB能使体系的玻璃化转变温度(Tg)下降,由93.71℃下降到86.36℃。 展开更多
关键词 聚氯乙烯 增韧改性 丙烯酸酯橡胶 纳米碳酸钙 丙烯酸丁酯/甲基丙烯酸甲酯/丁二烯三元共聚物
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聚偏氟乙烯-b-聚甲氧基聚乙二醇甲基丙烯酸酯共聚物的合成和凝聚态结构
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作者 高珊珊 王文硕 包永忠 《高校化学工程学报》 EI CAS CSCD 北大核心 2023年第4期560-566,共7页
为了制备综合性能优异的固态聚合物电解质基材,通过碘转移活性自由基聚合(ITP)合成聚偏氟乙烯-b-聚甲氧基聚乙二醇甲基丙烯酸酯(PVDF-b-PPEGMA)共聚物。通过1H-核磁共振和凝胶渗透色谱证明了共聚物分子的合成,采用红外光谱和透射电子显... 为了制备综合性能优异的固态聚合物电解质基材,通过碘转移活性自由基聚合(ITP)合成聚偏氟乙烯-b-聚甲氧基聚乙二醇甲基丙烯酸酯(PVDF-b-PPEGMA)共聚物。通过1H-核磁共振和凝胶渗透色谱证明了共聚物分子的合成,采用红外光谱和透射电子显微镜分析共聚物的凝聚态结构,并测试共聚物/双三氟甲基磺酰亚胺锂(LiTFSi)固态聚合物电解质的电导率。结果表明:聚甲氧基聚乙二醇甲基丙烯酸酯(PPEGMA)链段的嵌段引入可促进β相聚偏氟乙烯(PVDF)结晶的形成;PVDF和PPEGMA链段热力学不相容,嵌段共聚物存在微相分离,随着PPEGMA嵌段比增加,共聚物由“海-岛”相结构向双连续相结构转变。PPEGMA质量分数为25.5%的嵌段共聚物与锂盐混合(氧化乙烯与Li^(+)物质的量比n(EO):n(Li^(+))为10:1)能达到9.4×10^(-5)S·cm^(−1)的室温离子电导率。 展开更多
关键词 偏氟乙烯 甲氧基聚乙二醇甲基丙烯酸酯 嵌段共聚物 结晶 相结构
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Thermo-responsive cellulose papers grafted with poly(di(ethylene glycol)methyl ether methacrylate)
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作者 Weibing Wu Ruyuan Song +2 位作者 Jian Li Wenyuan Zhu Zhiliang Zhuang 《Journal of Bioresources and Bioproducts》 EI 2016年第3期127-131,共5页
Novel thermo-responsive cellulose papers were prepared via grafting poly(di(ethylene glycol)methyl ether methacrylate)(PDEGMA)by activators regenerating electron transfer(ARGET)and atom transfer radical polymerization... Novel thermo-responsive cellulose papers were prepared via grafting poly(di(ethylene glycol)methyl ether methacrylate)(PDEGMA)by activators regenerating electron transfer(ARGET)and atom transfer radical polymerization(ATRP).Attenuated total refraction Fourier-transform infrared spectroscopy(ATR-FTIR)and scanning electron microscopy(SEM)measurements of the modified paper showed that PDEGMA brushes were successfully grafted on the paper surface.The thermal stability of the papers before and after grafting was evaluated by thermogravimetric analysis(TGA).The PDEGMA-grafted paper exhibited a two-step thermal degradation process,and presented thermo-responsive characteristics.It was hydrophilic at room temperature but changed rapidly to highly hydrophobic when the temperature rose above 50℃. 展开更多
关键词 atom transfer radical polymerization thermo-responsiveness surface grafting cellulose paper poly(di(ethylene glycol)methyl ether methacrylate)
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原位微悬浮法纳米二氧化硅/氯醚树脂复合粒子的制备及表征 被引量:4
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作者 杨建军 吕国斌 +3 位作者 吴庆云 张建安 吴明元 王申生 《合成橡胶工业》 CAS CSCD 北大核心 2014年第2期91-95,共5页
用硅烷偶联剂KH-570对纳米SiO2进行表面处理,干燥后预先分散于乙烯基异丁基醚中,再通过原位微悬浮聚合法制备了纳米SiO2/氯醚树脂复合粒子;考察了KH-570添加量、pH值和反应时间对纳米SiO2表面接枝率的影响,并用傅里叶变换红外光谱、核... 用硅烷偶联剂KH-570对纳米SiO2进行表面处理,干燥后预先分散于乙烯基异丁基醚中,再通过原位微悬浮聚合法制备了纳米SiO2/氯醚树脂复合粒子;考察了KH-570添加量、pH值和反应时间对纳米SiO2表面接枝率的影响,并用傅里叶变换红外光谱、核磁共振氢谱、差示扫描量热分析、热重分析和透射电子显微镜对纳米SiO2和纳米SiO2/氯醚树脂复合粒子进行了表征.结果表明,纳米SiO2表面改性的最佳条件为:KH-570与纳米SiO2质量比为1.2∶1,pH值为8.0 ~9.0,反应时间为8h;制备出的纳米SiO2/氯醚树脂复合粒子以纳米SiO2为核,其平均粒径为150~ 250 nm,其中核的直径为100~150 nm. 展开更多
关键词 纳米二氧化硅 氯醚树脂 原位微悬浮聚合法 表面改性 核壳结构 接枝率 poly (vinyl chloride-co-vinyl ISOBUTYL ether)
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双极膜技术在电氧化制备3-甲基-2-吡啶甲酰胺中的应用 被引量:20
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作者 王嫣红 马秀玲 +2 位作者 陈日耀 郑曦 陈震 《物理化学学报》 SCIE CAS CSCD 北大核心 2008年第6期1041-1046,共6页
分别以戊二醛和Fe3+改性壳聚糖和海藻酸钠并分别与柔性链聚乙烯醇(PVA)共混,制备了Fe-SA-CS-GA/PVA聚合物双极膜.测定膜的红外光谱,I-V工作曲线,Na+与Cl-透过双极膜的迁移数,离子交换容量及阴阳两极室中OH-及H+的变化,并以扫描电镜观察... 分别以戊二醛和Fe3+改性壳聚糖和海藻酸钠并分别与柔性链聚乙烯醇(PVA)共混,制备了Fe-SA-CS-GA/PVA聚合物双极膜.测定膜的红外光谱,I-V工作曲线,Na+与Cl-透过双极膜的迁移数,离子交换容量及阴阳两极室中OH-及H+的变化,并以扫描电镜观察膜表面和界面层形态.IR与接触角分析结果表明,CS经GA/PVA改性后其亲水性能得到显著提高.将SA-CS/PVA双极膜及Nafion膜应用于电氧化制备3-甲基-2-吡啶甲酰胺.实验结果表明,以SA-CS/PVA双极膜为隔膜合成3-甲基-2-吡啶甲酰胺的产率达到49.8%,高于以Nafion膜为隔膜的产率.与传统的的方法相比,该方法的反应条件温和且能有效利用能源. 展开更多
关键词 双极膜 海藻酸钠 壳聚糖 聚乙烯醇 3-甲基-2-吡啶甲酰胺
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聚醚氨酯/聚甲基丙烯酸甲酯IPN阻尼性能研究 被引量:13
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作者 唐冬雁 蔡伟民 +3 位作者 张巨生 于金姝 周德瑞 李会章 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2000年第2期56-59,69,共5页
以甲苯二异氰酸酯预聚体与聚醚反应 ,合成了一系列高温固化的聚醚氨酯 ,用于与体型聚甲基丙烯酸甲酯的互穿聚合物网络化研究 ,并对所获得的IPN体系阻尼性能进行了测试 .动态力学性能检测结果表明 :聚氨酯软段中—OH与—NCO的比例、软硬... 以甲苯二异氰酸酯预聚体与聚醚反应 ,合成了一系列高温固化的聚醚氨酯 ,用于与体型聚甲基丙烯酸甲酯的互穿聚合物网络化研究 ,并对所获得的IPN体系阻尼性能进行了测试 .动态力学性能检测结果表明 :聚氨酯软段中—OH与—NCO的比例、软硬段的相对含量以及交联密度 ,对体系的相容性及阻尼性能都有显著影响 .检测结果还表明 。 展开更多
关键词 互穿聚合物网络 聚醚氨酯 IPN PMMA 阻尼性能
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PVC/MBS共混物的形态及力学性能 被引量:12
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作者 褚明利 刘哲 +2 位作者 李洪权 陈明 张会轩 《中国塑料》 CAS CSCD 北大核心 2010年第3期25-28,共4页
采用种子乳液聚合方法,在聚丁二烯乳胶粒子上接枝甲基丙烯酸甲酯(MMA)和苯乙烯(St),制得MBS核壳接枝共聚物,并将其作为增韧剂与聚氯乙烯(PVC)共混制备PVC/MBS共混物。考察了接枝不同MMA和St含量的MBS在PVC中的分散状态及其对PVC/MBS共... 采用种子乳液聚合方法,在聚丁二烯乳胶粒子上接枝甲基丙烯酸甲酯(MMA)和苯乙烯(St),制得MBS核壳接枝共聚物,并将其作为增韧剂与聚氯乙烯(PVC)共混制备PVC/MBS共混物。考察了接枝不同MMA和St含量的MBS在PVC中的分散状态及其对PVC/MBS共混物力学性能的影响。结果表明,当MBS壳层中MMA含量增加时,MBS粒子在PVC基体中的分散状态被改善;PVC/MBS共混物的冲击强度随之增加,冲击强度最高为1117.74 J/m;当MBS中接枝少量St时,PVC/MBS共混物呈现韧性断裂,冲击强度最高为1039.33 J/m;当MBS接枝大量St时,会产生内包容现象,不利于提高PVC共混物的冲击强度。 展开更多
关键词 聚氯乙烯 甲基丙烯酸甲酯 苯乙烯 分散形态 增韧 力学性能
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聚己内酯在聚己内酯/聚乙烯基甲基醚共混体系中的结晶研究 被引量:4
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作者 蒙延峰 李宏飞 +2 位作者 温慧颖 蒋世春 安立佳 《高分子学报》 SCIE CAS CSCD 北大核心 2007年第2期198-202,共5页
通过示差扫描量热(DSC)、广角X射线衍射(WAXD)、小角X射线散射(SAXS)研究了聚己内酯(PCL)/聚乙烯基甲基醚(PVME)共混体系中PCL的结晶行为.研究结果表明,共混聚合物中PCL的结晶度几乎不随体系的组成而发生变化.共混物中PVME的存在没有改... 通过示差扫描量热(DSC)、广角X射线衍射(WAXD)、小角X射线散射(SAXS)研究了聚己内酯(PCL)/聚乙烯基甲基醚(PVME)共混体系中PCL的结晶行为.研究结果表明,共混聚合物中PCL的结晶度几乎不随体系的组成而发生变化.共混物中PVME的存在没有改变PCL的晶体结构,但是随着PVME含量的增加,片晶之间的距离则大,这主要是由于非晶层增厚引起的. 展开更多
关键词 聚己内酯/聚乙烯基甲基醚 共混物 结晶行为
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PVC/PES相容性及对共混超滤膜性能的影响 被引量:14
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作者 李系蕴 张振家 乔向利 《环境科学与技术》 CAS CSCD 北大核心 2006年第7期28-30,共3页
研究了聚氯乙烯(PVC)与聚醚砜(PES)共混体系相容性及其对共混膜性能的影响。利用溶解度参数原则和混合热焓原则进行理论预测,用铸膜液粘度法进行实验表征,均说明该体系为部分相容体系,且其相容性与组成及共混温度有关。通过对共混膜传... 研究了聚氯乙烯(PVC)与聚醚砜(PES)共混体系相容性及其对共混膜性能的影响。利用溶解度参数原则和混合热焓原则进行理论预测,用铸膜液粘度法进行实验表征,均说明该体系为部分相容体系,且其相容性与组成及共混温度有关。通过对共混膜传质特性的考察,表明铸膜液的相容性会明显影响共混膜的性能;采用共混法可以改善膜性能。 展开更多
关键词 共混 相容性 聚氯乙稀 聚醚砜 超滤膜
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