环氧乙烷和环氧丙烷共聚体系的等温结晶和熔融

环氧乙烷（ＥＯ）和环氧丙烷（ＰＯ）共聚体系的等温结晶前期符合Ａｖｒａｍｉ方程。ＰＯ组分含量增加，Ａｖｒａｍｉ指数ｎ值由１．８到２．４，体系的结晶生长速率与共聚体系的组成和结晶度有关，ＥＯ／ＰＯ共聚体系的平衡熔点随ＰＯ含量的增加而降低。随Ｔｃ增大，△Ｈｍ与△Ｓｍ呈线性降低。     

IONIC CONDUCTIVITY OF EPOXY NETWORK/POLYETHYLENE GLYCOL- LITHIUM PERCHLORATE COMPLEX IPN SYSTEM

In an attempt to prepare a polymeric solid electrolyte with both high ionic conductivity at ambient temperature and adequate mechanical strength, an ionic conducting IPN composed of bisphenol A epoxy resin/polyethylene glycol containing LiClO_4 was synthesized. The dependence of conductivity was investigated as a function of salt content, composition and temperature. It has been revealed that a maximum of conductivity appeared when EO/Li=25, where EO denotes the—(CH_2CH_2O)-unit in polyethylene glycol, and that the temperature dependence of conductivity followed VTF equation, suggesting that the motion of ionic carriers resulted from the segmental motion of the polymer. When glycerol epoxy resin was used instead of bisphenol A epoxy, the ambient temperature (25℃) conductivity could somewhat further be raised up to 3×10~(-5) S/cm.     

环氧乙烷和环氧丙烷共聚物及其LiClO4复合物的热性能

用ＤＳＣ研究了环氧乙烷和环氧丙烷共聚物（ＥＯ／ＰＯ）及其ＬｉＣｌＯ＿４复合物的组成与热性能的关系，结果表明，结晶熔融热溶随ＰＯ的增加而减少，同时，结晶度下降，电导率上升；Ｏ／Ｌｉ＝２０的试样在２次升温中产生冷结晶；热历史影响聚合物的热性能。     

HEAT SHRINKING BEHAVIOUR OF γ-RADIATION CROSSLINKED POLYETHYLENE

Heat shrinking material of γ-radiation erosslinked polyethylene is widely used for various application in industry. In this study, DSC, TMA, WAXD and density measurement techniques were used to investigate the influence of MI and thermal history of LDPE on the effectiveness of network formation. Based on the results of heat stretching and heat shrinkage tests, it is found that the formation of a network as perfect as possible is indispensable to the irradiated material if good heat shrinkage property is desired. To this end, quenching technique and polyethylene with appropriate MI must be used so that an effective radiation effect will be obtained with a minimum amount of radiation dose. In spite of that the mechanical property of the irradiated polyethylene in the rubbery state is basically in agreement with the classical expression of the theory of high elasticity, only about 90% shrinkage can be reached. Besides, the heat shrinkage temperature T_s and the % shrinkage Sare both related to the radiation dose.     

环氧树脂潜伏性固化促进剂的研究

对环氧树脂/桐油酸酐/乙酰丙酮钕体系的热固化反应进行了研究。用DSC、TBA和固化仪等手段测定了凝胶化时间和表观反应活化能,计算了反应动力学参数。结果表明,乙酰丙酮钕对体系的固化具有潜伏性促进作用。     

简易示差扫描量热计的研制

<正> 示差扫描量热计(DSC)是在示差热分析仪(DTA)基础上发展起来的新型热分析仪,它在高分子方面已取得广泛应用.我们自1975年起研制了适合有机、高分子应用的DSC,取得一些经验,简介如后. 图1是DSC的结构示意图.DSC独有的单元是量热部.它由一对小加热器组成的试料部(量热部Ⅰ)和由热量补偿回路等组成的热量补偿部(量热部Ⅱ)构成.我们研制以此单元为主,其它部分均以商品仪器配用.     

反应挤出条件对PP-g-GMA接枝率、接枝效率和熔体流动速率的影响

聚丙烯;反应挤出条件对PP-g-GMA接枝率、接枝效率和熔体流动速率的影响;甲基丙烯酸环氧丙烷;接枝共聚;共聚     

聚环氧乙烷环氧丙烷—盐复合物的结构和导电性

制备了室温电导率较高（１０＾－４Ｓ·ｃｍ＾－１），力学性能较好的环氧乙烷和环氧丙烷共聚物－Ｌｉ－ＣｌＯ４复合物薄膜，研究了共聚物组成对结晶及对复合物室温电导率的影响，考察了高氯酸锂浓度对复合物室温电导率的影响以及复合物电导的温度依赖关系，发现复合物中没有结晶配合物，其结晶度随聚合物结构和盐含不同而变化，室温下呈弹性体。     

乙酰丙酮金属络合物对酸酐固化环氧树脂体系潜伏性促进作用的研究

A transition metal acetylacetone was studied as latent accelerator in the curing of anhydride cured epoxy resin by DSC, TEA, and rotation viscometer technique. The results reveal that the metal acetylacetone serves as an latent accelerator for anhydride curable epoxy resin system, and the rate of curing is found to increase with enhanced concentrations of the metal chelate. The system provides very fast gel time at 160-180℃ and combined with very good storage stability (> two months). Curing kinetic studies reveal that the overall suring process follows first order kinetics. The electrical,mechanical and thermal properties of cured com-pound of epoxy resin system catalyzed by the M_T(acac)_n and BDMA accelerator and cured by anhydride was also studied and compared in this paper.     

环氧树脂潜伏性固化促进剂的研究：Ⅱ.促进剂对固化物性能的影响

对双酚A环氧树脂/桐油酸酐/乙酰丙酮钕体系的热固化及其产物性能,用热分析,介电损耗和动态力学等手段进行了研究。结果表明,乙酰丙酮钕除对固化具有潜伏性促进作用外,尚可使固化物的物理性能明显提高。