可聚合性季铵盐及其共聚物的制备与性能研究

以对氯甲基苯乙烯和十二烷基二甲基叔胺为原料,合成了一种可聚合性季铵盐(PQA),并采用自由基溶液聚合法制备了季铵盐-丙烯腈二元共聚物(PQA-co-AN)。用FT-IR、1H-NMR和EA表征了PQA和PQA-co-AN的结构,同时用DSC-TG研究了其热稳定性,并测试其抗菌性能。结果表明,PQA经与AN共聚后,共聚物PQA-co-AN的热稳定性和抗菌性能都比单体PQA有所提高。

可聚合性季铵盐—膨润土嵌入复合物的制备

本文合成了三种含有可聚合基团的季铵盐，用它们与膨润土夹层中的阳离子进行离子交换，制得可聚合性季铵盐—膨润土嵌入复合物。这些嵌入复合物在苯乙烯中具有很好的防沉降性，表观密度比膨润土小，而白度比膨润土有较显著的提高。

可聚合性季铵盐及其聚合物的合成与表征

合成了三种含不饱和双键的季铵盐：甲基丙烯酰氧乙基-苄基-二甲基氯化铵(MBDAC)， 甲基丙烯酰氧乙基-丁基-二甲基溴化铵(MBDAB)和甲基丙烯酰氧乙基-乙基-二甲基溴化铵(MEDAB)， 用红外光谱、 元素分析、 核磁共振谱对其结构进行了表征. 用自由基聚合法合成了MBDAC的均聚物及其与甲基丙烯酸甲酯和苯乙烯的共聚物， 并用元素分析、 GPC、 红外光谱等表征了聚合物的结构， 用DSC和TG研究了其热稳定性， 发现经与10%摩尔的MBDAC共聚后， 使PMMA和PS的Tg升高， 拉伸强度显著提高， 但冲击强度下降.

图情领域机构知识库可聚合性分析

开放获取的机构知识库资源是网络信息资源聚合对象的一个重要组成部分,目前机构知识库资源的可聚合性直接影响聚合实现的效率和质量,本文在论证可聚合性分析框架的基础上,调查OpenDOAR中图书情报领域开放存取资源的分布情况,相关政策以及数据开放方式来回答这一问题。调查结果显示,图书情报领域的机构知识库的资源能够在一定程度上满足信息聚合需求,但仍存在中文资源可聚合数量较为缺乏等问题,而版权许可问题是目前资源聚合的最大障碍。本文最后提出了机构知识库的聚合策略。

PS-VA模式预倾角的影响因素研究

TFT-LCD有多种显示模式,其中PS-VA模式以其高透过率、高对比度而被广泛应用。与传统的VA显示模式相比,PS-VA模式不需要通过PI来控制预倾角大小。PS-VA模式是在液晶中添加一定量的可聚合性化合物(RM),通过改变制程条件实现不同的预倾角大小。本文主要研究了RM浓度、UV1加电电压、UV1固化光计量三个条件对预倾角大小的影响。结果表明,预倾角大小和RM浓度、UV1加电电压、UV1固化光计量均有很强的正相关性。在现实生产的过程中,可以根据不同产品的需求来调整相应的影响因素,以达到最佳的预倾角设计。

可聚合阳离子含氟表面活性剂的合成与性能

该文以全氟烷基乙基醇(PFEA)为原料,设计合成了3种不同含氟链段长度的可聚合阳离子含氟表面活性剂——N-(乙酸全氟烷基乙基酯)-N-(乙醇丙烯酸酯)二甲基溴化铵(PFDM),通过核磁共振氢谱(1HNMR)对其结构进行了表征。利用Zeta电位测定、表面张力测定等手段考察了不同含氟链段长度对PFDM表面活性的影响,并证明了PFDM的可聚合性。结果表明,随含氟链段的增长,PFDM在水介质中形成胶束的胶束聚集数逐渐增大,CMC呈指数下降,表面活性逐渐增强,且具有良好的可聚合性。

含芳环的可聚合阳离子型Hydrotrope的自缔合行为和助溶性能

采用尼罗红(Nile red)染料为探针,利用吸收和发射光谱研究了具有不同烷芳基结构的可聚合阳离子型Hydrotropes(PCHs)的溶液性质,结果表明其在水溶液中易发生自缔合行为并具有两个阈值浓度:分子开始自缔合的临界浓度(CAC)(10-1—10-2 mol/L),开始大幅度提高助溶作用的最小助溶浓度(MHC)(>10-1 mol/L),两阈值浓度均随化合物分子结构中的疏水基团尺寸的增大而减小.两亲化合物聚集体的微环境极性测定的结果显示,其极性比表面活性剂胶束高,并且随着化合物浓度的增大不断下降,表明形成的聚集体结构比较疏松,且其分子堆砌密度随聚集体的增大而逐步升高.此外,通过自由基聚合得到相应的两亲聚合物仍保留Hydrotrope原有的性能,并具有更显著的助溶作用.

新型两亲性聚氨酯丙烯酸酯大单体的合成及性能研究

以异氟尔酮-二异氰酸酯(IPDI)、聚乙二醇(PEG)、二羟甲基丙酸(DHMPA)、甲基丙烯酸-β-羟乙酯(HEMA)等为原料,合成了一种新型的功能性大单体。该大单体具有两亲性和可聚合性,可用作反应型表面活性剂——可聚合乳化剂,与传统乳化剂 OP-10与十二烷基硫酸钠相比,具有优异的乳化性能和独特功能。

丙烯酸改性松香(2-甲基丙烯酰氧基乙基)酯的合成和表征

以丙烯酸改性松香(AR)为原料,先与草酰氯反应合成丙烯酸改性松香酰氯(AR-C l),然后与甲基丙烯酸-2-羟基乙基酯进行酯化反应合成了丙烯酸改性松香(2-甲基丙烯酰氧基乙基)酯(AR-2-HEMA),并分别采用FT-IR、GC-MS、13C NMR和差示扫描量热仪(DSC)对其结构和性能进行表征。研究结果表明,丙烯酸改性松香(2-甲基丙烯酰氧基乙基)酯主要由丙烯海松酸(2-甲基丙烯酰氧基乙基)酯(37.88%)和树脂酸(2-甲基丙烯酰氧基乙基)酯(52.48%)组成。丙烯海松酸(2-甲基丙烯酰氧基乙基)酯两种异构体质量分数分别为31.79%和6.09%。所制备的丙烯酸改性松香(2-甲基丙烯酰氧基乙基)酯在引发剂的存在下可以发生聚合反应。

松香基甲基丙烯酸酯单体的合成和表征

以可再生资源松香衍生物脱氢枞酸(DHR)为原料,先与草酰氯反应合成脱氢枞酸酰氯(DHR-Cl),然后与甲基丙烯酸-β-羟基丙基酯(2-HPMA)进行酯化反应合成了脱氢枞酸(β-甲基丙烯酰氧基丙基)酯(DHR-2-HPMA),并分别采用FT-IR、GC-MS1、3C-NMR和DSC对其结构和性能进行表征,确定了合成反应的最佳条件为DHR与草酰氯的摩尔比为1∶(1~1.15),DHR-Cl与2-HPMA的摩尔比为1∶(1~1.15),酰氯化反应时间为3 h,酯化反应时间为5 h。结果表明,脱氢枞酸(β-甲基丙烯酰氧基丙基)酯是一个同分异构体,质量含量为97.7%,2种结构质量含量分别为67.29%和30.25%。所制备的脱氢枞酸(β-甲基丙烯酰氧基丙基)酯在引发剂的存在下可以发生聚合反应。

丙烯酰氧基Span-80的合成及在乳化炸药中的应用

详细介绍了一种新型乳化剂的合成及其部分应用。用 Span- 80与丙烯酸制备合成了含丙烯酰氧基的 Span- 80 ,这种新乳化剂具有可聚合性。

改性硼酸盐晶须用硼酸酯偶联剂的研制

以硼酸、乙醇胺、甲基丙烯酰氯等为主要原料,合成了改性硼酸盐晶须用新型可聚合硼酸酯偶联剂,由红外光谱IR对其进行表征和确认。实验研究了原料配比、阻聚剂的选择对硼酸酯收率影响,并考察了产物的物理性能、水解性能以及聚合性能。结果表明此类硼酸酯偶联剂具有很好的储存性和实用性。

信息中心网络的理想命名规则研究

命名规则是信息中心网络的关键。研究界围绕着命名规则开展了大量的研究,但至今没有形成一种统一的命名规则,这势必会影响信息中心网络的进一步发展和普及。为此,结合信息中心网络的特性提出了一种命名规则,与已有命名规则相比,该命名规则具有通用性、惟一性、自我验证性、可聚合性和持久性,能够满足信息中心网络的命名需求。

ALLIED FUZZY c-MEANS CLUSTERING MODEL

A novel model of fuzzy clustering, i.e. an allied fuzzy c means （AFCM） model is proposed based on the combination of advantages of fuzzy c means （FCM） and possibilistic c means （PCM） clustering. PCM is sensitive to initializations and often generates coincident clusters. AFCM overcomes this shortcoming and it is an ex tension of PCM. Membership and typicality values can be simultaneously produced in AFCM. Experimental re- suits show that noise data can be well processed, coincident clusters are avoided and clustering accuracy is better.

Coordinate Bond Breaking Induced by Collapse of Poly(N-isopropyl acrylamide) as Ligands of a Rare Earth Complex

A novel water-soluble luminescent complex consisting of Eu(ally-dbm)3-2Tppo and poly(N-isopropyl acrylamide)(PNIPAM)is synthesized through a series of chemical reactions.The structure of the complex is characterized by TGA,GPC,HNMR,and the thermal-responsive uorescence of the complex in aqueous solution is investigated.It is found that PNIPAM collapse above the lower critical solution temperature causes the coordination bond breaking,leading to weakening of the uorescence from Eu3+and enhancing of the uorescence from the ligands.When temperature decreases,the uorescence from Eu3+is found to boost up and the uorescence from ligands weakens accordingly.It is deduced from this phenomenon that the ligands recoordinate with europium ions again along with the temperature decreasing,which is further confirmed by IR measurements.This thermal-responsive uorescence is of reversibility,which can be used as molecular probes for biological imaging and collapse studying of PNIPAM.

Photorheologically reversible micelle composed of polymerizable cationic surfactant and 4-phenylazo benzoic acid

A photorheologically reversible micelle composed of polymerizable cationic surfactant n-cetyl dimethylallyl am- monium chloride （CDAAC） and trans-4-phenylazo benzoic acid （trans-ACA） was prepared. The effects of molar ratio of CDAAC/trans-ACA, time of UV and visible light irradiation and temperature on the rheological properties of micellar system were investigated. The results show that before UV irradiation the system with an optimum CDAAC/trans-ACA molar ratio of 1.4 forms viscoelastic micelles at 45 ℃. After 365 nm UV irradiation, the viscos- ities of micelle systems with different concentrations at fixed molar ratio of 1.4 are decreased by 85%-95%. The CDAAC/trans-ACA （14 mmol. L- 1/10 mmol. L- 1 ） micelle system exhibits shear thinning property and its viscos- ity is decreased obviously with the increases of UV irradiation time less than I h. The rheological process during LIV irradiation for CDAAC/trans-ACA （14 mmol- L- 1/10 mmol. L 1） micelle proves that viscosity, elastic modulus G＇ and viscous modulus G＂ will reduce quickly with the UV light. Furthermore, the micelle system after 1 h UV- irradiation is able to revert to its initial high viscosity with 460 nm visible light irradiation for 4 h, and the micelle can be cycled between low and high viscosity states by repetitive UV and visible light irradiations. The LIV-Vis spectra of CDAAC/trans-ACA micelle indicate that its photosensitive theological properties are related closely to photoisomerization of trans-ACA to c/s-ACA.

Effect of the Molecular Structure of Polymer Dispersants on Limestone Suspension Properties in Fine Grinding

Polymer dispersants are widely used as grinding aids to reduce the viscosity of mineral particle suspensions and to improve energy efficiency during fine grinding. The authors studied here the effects of polymer dispersants of different molecular structure on limestone suspension properties in wet stirred media milling. The polymers differed in their molecular weight and PDI （polydispersity index）. Two traditionally fractionated polymer dispersants having a high PDI （over 2） and one made by controlled radical polymerization having a low PDI （1.2） were tested. It was noticed that these dispersants worked as electrosteric stabilizers and prevented the agglomeration of ground limestone particles. Their addition allowed increased solids concentrations to be used in the grinding experiments and at the same time lowered the particle size and specific energy consumption. The particle sizes obtained were about 1 μm regardless of the dispersant or its dose. The dispersant with a low PDI reduced the viscosity more than did the high PDI dispersants. The results indicate that higher solids concentrations can be used at the same dispersant dose when a low PDI dispersant is used, leading to energy savings via increased throughput. Alternatively, a lower dose of low PDI polymer dispersant than of a high PDI polymer dispersant can be used at the same solids concentration.

Sustainable Identities in the Technological Esprit of Architecture

Innovation and energy efficiency are the essential paradigms of the new technology and design culture, in the sustainable economic and social development, highlighting the performance of new technologies, systems and intelligent materials, such as sustainable identities in architectural envelopes. Then, contextualized sustainable architectural objectives favor material and energy flows, pointing to the constructive flexibility, identity and compatibility of technological innovation, which contrasts with climate change. So sustainable use of natural resources, renewable energy, in line with the principles of the 2030 Agenda for SDGs （Sustainable Development Goals）. The well-being of the community with the valorisation of places and the environment, indicates the technological excellence of architecture, synchronous with territorial metamorphoses. Thus, vision glass principles in the environmentally responsive wall, and engineered wall, in external awareness, cellular flooring for eco-efficiency. The methodologies indicate the applications of new design models for new constructions and regeneration, with dynamic, efficient and integrated envelopes integrated with renewable energy storage technologies, neomaterials and high performance insulating. Then HPP （high performance polymers） nanotechnologies are based on efficient pigments, intelligent bioPCM （PCM for phase change material） nano technologies, thermoregulators with high thermal inertia. The goal is towards an escalation of sustainable architectures that contrasts with climate change and pollution ofanthropic origin, for smart and sustainable growth.

Porous polymer supported palladium catalyst for cross coupling reactions with high activity and recyclability

Porous polymer supported palladium catalyst for cross coupling reactions with high activity has been successfully prepared by coordination of Pd 2+ species with Schiff bases functionalized porous polymer. The catalyst has been systemically investi-gated by a series of characterizations such as TEM, N 2 adsorption, NMR, IR, XPS, etc. TEM and N 2 isotherms show that the sample maintains the nanoporous structure after the modification and coordination. XPS results show that chemical state of palladium species in the catalyst is mainly +2. More importantly, the catalyst shows very high activities and excellent recycla-bility in a series of coupling reactions including Suzuki, Sonogashira, and Heck reactions. Hot filtration and poison of catalysts experiments have also been performed and the results indicate that soluble active species (mainly Pd(0) species) in-situ gener-ated from the catalyst under the reaction conditions are the active intermediates, which would redeposit to the supporter after the reactions.

“Building-block crosslinking”micelles for enhancing cellular transfection of biocompatible polycations

Incorporating functional ligands and biodegradable bonds into biocompatible low-molecular-weight(LMW)polymers,such as 1.8 kDa poly(ethylenimine)(PEI1.8 k),is a common strategy to improve the properties of LMW polymers including biosafety and delivery efficacy.This study demonstrates the hypothesis that introducing different functional ligands and linked reductive disulfides in PEI 1.8k will achieve superior siRNA transfection efficiency.By incorporating PEI-X(X represents cholesterol(Ch),heptafluorobutyric anhydride(HFBA,F)and 4-carboxyphenylboronic acid(PBA))functional ligands into PEI 1.8k and subsequently crosslinking with each other via disulfide bond links,reductive-responsive PEI-X-SS-X-PEI copolymers were constructed to enhance the cellular transfection via the synergistic effect of the high affinity of Ch,F and PBA to cell membranes and the disulfide reduction triggered intracellular disassembly of micelles and subsequent siRNA release.Extraordinarily,ternary Ch-SS-F-SS-PBA micelles exhibited the strongest siRNA transfection efficiencies in in vitro cell experiments and in vivo animal experiments due to the coordination of enhanced serum stability,promoted cell uptake and endosomal escape,and cell targeting ability.This strategy of constructed multifunctional polymer here we called"building-block crosslinking"showed a simple and smart way to synthesize new materials.Also this strategy of constructing ligands-directed reduction-sensitive micelles improves the transfection efficiency of LMW PEI and provides a valuable insight to develop novel gene delivery systems.