STUDY ON THE EPOXY RESIN TOUGHENED BY HYDROXY-TERMINATED BUTADIENE-ACRYLONITRILE COPOLYMER

Toughened epoxy resin with excellent properties was obtained by adding organic acid anhydride curing agent and hydroxy-terminated butadiene-acrylonitrile copolymer (HTBN), which is cheaper than CTBN. The anhydride reacts with both epoxy groups on epoxy resin and hydroxyl groups on HTBN. As a result the soft long chains of HTBN and the rigid chain of epoxy resin form one network, giving the resin toughness. Two-phase structure of the toughened resin was observed by SEM and TEM.     

聚四氢呋喃/聚苯乙烯交联嵌段及接枝共聚物的合成与阻尼性能

Carboxyl vinyl terminated polytetrahydrofuran macromers and telechelic oligomers were synthesized from hydroxyl terminated polytetrahydrofuran by end group conversion. From these macromers or telechelic oligomers and styrene polytetrahydrofuran/polystyrene segmented and graft copolymers were synthesized and the effects of molecular structure on the damping properties of those copolymers were also studied.     

POLYURETHANE-POLYSTYRENE INTERPENETRATING NETWORKS

A series of polyurethane based on liquid chloroprene-hydroxyethyl methacrylate copolymer(CP-co-HEMA)-polystyrene (PS) interpenetrating polymer networks (PU-PS IPN) were synthe-sized. Some physical properties were examined and density behavior was investigated. In 60%polyurethane (PU) system, the tensile strength and density increased greatly. Transmission electronmicrographs showed that the phase separation existed and the sizes of PS domains dispersed in PUphase were about 500-4,000 A. In comparison with correlative PU-PMMA IPN system, whichhas the higher compatibility, this system showed an extensive phase separation and clear boundaries.There was no phase inversion observed even for 60% PU system in which PS was still the dispersed phaseand PU the continuous phase. This was due to the relatively faster rate of formation of PU than thatof ST polymerization.     

LIQUID CHLOROPRENE-HYDROXYETHYL METHACRYLATE COPOLYMER MODIFIED EPOXY RESIN Ⅱ. N, N-DIMETHYL BENZYL AMINE CURING SYSTEM

A series of liquid chloroprene-hydroxyethyl methacrylate copolymer (CP-HEMA) modifiedepoxy resin were prepared. The effects of CP-HEMA content, curing conditions on physical pro-perties of the modified system were examined. With IR and Viscoelastocuremeter, the curing reactionrate was determined and the mechanism of the curing reaction was discussed. The effects of CP-HEMA content and curing conditions on morphology were mainly observed by scanning electronmicroscopy.     

网间交联型增韧环氧树脂/蓖麻油聚氨酯互穿网络聚合物的动态力学性能和形态结构

以增韧环氧树脂(TEP)和蓖麻油聚氨酯[PU(CO)]形成的互穿网络聚合物(IPN),两网络间具有一定数量的交联点,在一定组成下,该IPN的tanδ-T曲线半峰宽达100℃,tanδ最大值接近1,阻尼性能良好。形态研究表明,该IPN既有增韧环氧树脂本身的两相结构,又有IPN的两相结构。     

丁二烯与丙烯腈共低聚反应中共聚物组成的控制

在二元共聚反应中,为了制备具有均匀组成的共聚物,对于分批聚合,在反应过程中须补加消耗较快的单体以保持单体的浓度比为常数。本工作提出了为控制共聚物组成在反应过程中补加单体的计算方法,它不仅适用于丁二烯与丙烯腈的共低聚反应,也适合于其它二元共聚反应。用这种方法制备了具有均匀组成的丁二烯与丙烯腈共低聚物。     

遥爪型液体聚合物及其多相共聚物——Ⅷ.端羧基乙烯基四氢呋喃-环氧丙烷液体聚合物与甲基丙烯酸缩水甘油酯的交联

本文研究了端羧基乙烯基四氢呋喃-环氧丙烷液体共聚物(TVC-PTP)与甲基丙烯酸缩水甘油酯(GMA)的反应。观察了组成比,催化剂等对反应产物力学性能的影响。用红外光谱跟踪了这一反应过程,观察了乙烯基和环氧基的消失速度。用平衡溶胀法测定了交联聚合物单位体积内有效交联链的数目和交联点间平均分子量,观察了它们对交联聚合物力学性能的影响。     

遥爪型液体聚合物及其多相共聚物的合成与表征——Ⅲ.遥爪型三组份四臂星形共聚物的合成及其动态力学性能

本文在前报所合成的端羧基乙烯基四氢呋喃-环氧丙烷液体共聚醚的基础上,利用其端羧基同双官能团环氧反应,生成端环氧基三嵌段共聚物。然后再利用端乙烯基与烯类单体反应,制备了遥爪型三组份四臂星形共聚物。通过动态力学性能的测试,观察了一些因素对阻尼性能的影响。     

从端羟基液体聚丁二烯制备的弹性体 Ⅱ.端羟基液体聚丁二烯的分子量分布对弹性体力学性能的影响

本文研究了端羟基液体聚丁二烯(HTPB)的分子量分布对由HTPB,N、N-二(2-羟丙基)苯胺和甲苯二异氰酸酯制备的弹性体的力学性能的影响。研究结果表明,HTPB的多分散指数从1.6增加到2.1,弹性体的抗张强度,100％模量和硬度未见不良影响,而且略有提高。弹性体的永久形变增加较明显。     

丁腈羟平均官能度对固化反应及固化物性能的影响

以过氧化氢为引发剂,加入巯基乙醇或丙烯酸羟乙酯,合成了四种不同官能度的端羟基丁二烯-丙烯腈共聚物。以异佛尔酮二异氰酸酯为固化剂,N,N'-二羟丙基苯胺为链延伸剂,制得一系列多嵌段聚氨酯弹性体,研究了平均官能度对固化反应速度及固化物力学性能、动态力学性能、热性能和耐油性能的影响规律。