聚乙烯醇衍生的聚离子复合物的研究——Ⅳ.聚离子复合物膜的力学行为及透过性能

The mechanical behavior of polyionic complex (PIC)membranes derived from polyvinyl alcohol(PVA) or ethylene-vinyl alcohol copolymer (EVA) have been investigated. The presence of ethylene block segment in the backbone of polyions can endow PIC membranes with more toughness. Increasing the degree of substitution of the polyions, the formed PIC becomes harder and more brittle. Under the environment of relative humidity (R. H. ) of 40%, the tensile strength, relative elongation and modulus of PICs are at about 300kg/cm²,10% and 8×10³kg/cm²,respectively,whereas inthe environment of 90% R.H.M these of PICs derived from EVA are at about 90 kg/cm²,150% and 13kg/cm²,respectively,better than that of PVA derived polyionic membrane and ordinary PIC such as Ioplex 101. The permeabil-ity of PIC membranes derived from EVA have also been studied.     

球壳烯与侧链含有给电子基团聚合物在光诱导下的电荷转移现象

球壳烯与侧链含有给电子基团聚合物在光诱导下的电荷转移现象喻凤银，周锡煌，李福绵（北京大学化学系，北京，１００８７１）关键词球壳烯，Ｃ＿（６０），电荷转移现象，含二甲氨基苯基的苯乙烯共聚物球壳烯是近年来发现的除金刚石、石墨以外碳的第三种同素异构体［１］...     

COPOLYMER OF 1-(ACETYLSALICYLYLOXY)ETHYL METHACRYLATE AND ITS HYDROLYSIS

The copolymers of 1-(acetylsalicylyloxy)ethyl methacrylate (HEMA-ASA) with methacrylicacid (MA) have been prepared and their hydrolysis in dioxane-H_2.O either in acdic or alkaline medium,at 60℃or 37℃have been investigated. It is found that the chief product of hydrolysis is alwaysaspirin with minor amount of salicylic acid. Due to its neighbouring group effect, the hydrolysisrate of (HEMA-ASA)-MA copolymer markedly depends on its composition and the pH value ofhydrolysis medium, i.e. the hydrolysis rate increases with increasing mole fraction of MA in the copoly-mer and pH value of hydrolysis medium.     

功能高分子与未来的化学工业

功能高分子,是70年代从高分子科学与技术领域发展起来、与其它学科密切结合而派生的边缘学科,所涉范围甚广,内容非常丰富。目前虽尚处于开拓阶段,但在某些方面也已崭露锋芒。“功能高分子”这个名词,虽多援用,但它的定义,所包括的范围和分类都不是很明确的。概括说来,功能高分子是指在合成或天     

碳笼烯的高分子化──苯乙烯－烯丙基胺共聚物与C60的反应

Reaction of C₆₀ with poly (styrene-co-allylamine)was studied by GPC, FT-IR and TGA methods.GPC traces demonstrated that the M.of reaction product increased and exhibited a broader molecular weight distribution.The strong new bands at 1200cm^-1 appeared in FT-IR spectrum of the product indicated that the covalently C₆₀--bound copolymer was formed. TGA analysis showed that fullerene-functionalized polymer was a homogeneous system which increased the thermosteadiness of copolymer.     

碳笼烯-60对Ziegler-Nata催化剂催化苯乙烯聚合的影响

碳笼烯 ６０对Ｚｉｅｇｌｅｒ Ｎａｔａ催化剂催化苯乙烯聚合的影响洪瀚周锡煌李福绵（北京大学化学学院北京１００８７１）关键词碳笼烯 ６０（Ｃ６０），Ｚｉｅｇｌｅｒ Ｎａｔａ催化剂，配位聚合，等规聚苯乙烯Ｃ６０独特的球笼形空间结构和电子结构决定了其有许...     

8-丙烯酰氧喹啉及其聚合物增感的丙烯腈光聚合

<正> 我们曾研究过电子给体基团和电子受体基团共存于同一分子中的一类功能性单体,如甲基丙烯酸-4-(N,N)-二甲氨基苄酯(DMABMA)、N-(4-N′,N′-二甲氨基苄基)丙烯酰胺(DMAPAA)、8-丙烯酰氧喹啉(AQ)。N-丙烯酸-N′=苯基哌嗪(APP)等     

含受电子生色基团烯类单体 - 对乙烯氧基甲基苯甲腈的合成及其荧光“结构自猝灭”效应

含受电子生色基团烯类单体 对乙烯氧基甲基苯甲腈的合成及其荧光“结构自猝灭”效应杜福胜李福绵（北京大学化学学院北京１００８７１）关键词对乙烯氧基甲基苯甲腈，吸收光谱，荧光光谱，“结构自猝灭”效应我们曾经报道过一系列含有给电子荧光生色基团的丙烯酰类及马...     

甲基丙烯酸－N，N－二甲氨基乙酯及其聚合物的热和pH响应性

甲基丙烯酸－Ｎ，Ｎ－二甲氨基乙酯及其聚合物的热和ｐＨ响应性陈双基，薛梅，李福绵（北京大学分校化学系北京１０００８３）（北京大学化学系北京１００８７１）关键词聚（甲基丙烯酸－Ｎ，Ｎ－二甲氨基乙酯），热响应性，ｐＨ响应性，功能高分子材料近年来，关于热响应...     

表面修饰乙烯－乙烯醇共聚物膜的“原地”聚离子复合化及其若干性能

he ethylene-vinyl alcohol copolymer membrane with polyionically complexationalized layer has been prepared by in situ polyionic complexation from cationically modified surface of EVAL membrane and phosphorylated EVAL aqueous solution, which can be considered as a feasible route to modify the surface of membrane for improving the properties , and which is a way to avoid the using of shielding solvent for the processing of polygonic complexes. The condition for the phosphorylation of EVAL has been studied. The effect of the chemical composition of the polyionic complex membrane on the contact angle, water con-tent,mechanical and thermal properties,as well as blood compatibility have been investigated.