夹心复合PZT材料及其应用

本文主要描述致密-多孔-致密夹心复合PZT材料及其在窄脉冲超声换能器方面的应用。通过两类六种不同夹心复合材料的换能器实验表明,未充硅橡胶的夹心复合材料是一种制作窄脉冲超声换能器的新型换能材料。     

左旋18—甲基炔诺酮—硅橡胶缓释体系小角激光散射法研究

以小角激光前向散射和背散射法研究了左旋１８－甲基炔诺酮－甲基乙烯基硅橡胶缓释体系的光散射时效行为，用紫外分光光度法测定释放过程，讨论药物释放过程中高分子链段运动和聚合物结构对药物释放的影响．     

国产室温硫化硅橡胶的声学特性

本工作测量了国产室温硫化硅橡胶十个品种的纵波和拉伸波波速与衰减常数,考察了频率和温度对纵波波速的影响,并将其性能与常规透声橡胶进行了比较.研究表明,这些室温硫化硅橡胶的纵波衰减常数,声速频散和温度系数明显低于常规透声橡胶,并且有与液体十分相近的泊松比.     

导电硅橡胶理论研究进展

综述了导电硅橡胶的理论研究进展，包括导电通路的形成以及体系的电学性能。并讨论了该领域有待于入研究的问题。     

硅橡胶热降解动力学的研究

用恒温热失重方法，研究了甲基硅橡胶（Ｓｉ—Ｏ—１），用氢氧化钾催化聚合的甲基硅橡胶（Ｓｉ—Ｏ—２），主链含环二硅氮烷的硅氮橡胶（Ｓｉ—Ｎ—１）以及它与Ｓｉ—Ｏ—１的共混物Ｓｉ—Ｏ—３和与Ｓｉ—Ｏ—２的共混物Ｓｉ—Ｏ—４的热降解反应动力学．结果表明Ｓｉ—Ｎ—１有最高的热稳定性，在氮气下，其降解反应活化能为３４４ｋＪ／ｍｏｌ．并且发现它分别与Ｓｉ—Ｏ—１和Ｓｉ—Ｏ—２的共混物的热稳定性大幅度提高．Ｓｉ—Ｏ—３在氮气下的降解活化能由未加入Ｓｉ—Ｎ—１前的１５２ｋＪ／ｍｏｌ提高到２３０ｋＪ／ｍｏｌ；Ｓｉ─Ｏ─４则由未混入Ｓｉ─Ｎ─１前的６１ｋＪ／ｍｏｌ提高到１４４ｋＪ／ｍｏｌ．我们认为这种作用机理是由于硅氮橡胶除去了微量吸附水和硅羟基并导致催化剂的离子对难于分离的结果．     

高硅ZSM—5沸石填充硅橡胶膜的研究（Ⅳ）：沸石粒径和不同品…

研究了粒径为１５μｍ和５μｍ的水热处理Ｓｉｌｉｃａｌｉｔｅ－Ｉ填充ＰＤＭＳ膜以及酸处理Ｓｉｌｉｃａｌｉｔｅ－Ｉ填充不同品种硅像胶膜对低浓度乙醇－水混合物的渗透发分离性能的影响。结果表明，沸石粒径的减小，不利于乙醇－水分离系数的提高；不同品种硅橡胶有沸石充膜对乙醇－水的渗透蒸发分离性能与硅橡胶本身的性质有关。     

交联补强硅橡胶包埋18-甲基炔诺酮的释放行为

甲基乙烯基硅橡胶;交联补强硅橡胶包埋18-甲基炔诺酮的释放行为;药物释放系统     

REINFORCEMENT OF POLYDIMETHYLSILOXANE NETWORKS BY NANOCALCIUM CARBONATE

Although a number of investigations have been devoted to the analysis of silica or carbon black filled elastomer networks, little work has been done on the reinforcement of CaCO3 filled elastomer network. In this work, the reinforcement of polydimethylsiloxane (PDMS) network by using CaCO3 nano-particles was investigated. We have found a simultaneous increase of tensile strength, modulus and elongation with the increase in nano-CaCO3 content, which suggests that nano-CaCO3 particles can indeed be used as a reinforcing agent, just like silica or carbon black. Interestingly, the tensile strength,modulus and elongation were seen to leave off for the first time when the content of nano-CaCO3 particles reaches to 80%.PDMS also showed an enhanced elastic modulus and storage modulus with the increase in nano-CaCO3 content, particularly for samples with high nano-CaCO3 content. SEM was used to investigate the dispersion of the filler in PDMS matrix. A better dispersion was found for samples with high nano-CaCO3 content. A great increase of viscosity was found for samples with higher filler content, which is considered to be the reason for the good dispersion thus the reinforcement, because high viscosity will be helpful for breaking the agglomerates of fillers into small size particles under effect of shear. Our work provides a new way for the reinforcement of elastomer by using an adequate amount of nano-CaCO3 particles instead of as mall quantity of silica, which is not only economically cheap but also very effective.     

气相白炭黑表面处理率的影响因素及判定

气相白炭黑是一种二氧化硅纳米材料，气相白炭黑的最主要应用是用于硅橡胶的补强，但气相白炭黑在硅橡胶中很难分散，影响了补强效果，本文用六甲基二硅氮烷对白炭黑进行表面处理并对白炭黑表面处理率问题做一些探讨。     

含有稠环侧链的聚硅氧烷的合成及其对加成型高温硫化硅橡胶性能的影响

将含有多乙烯基的聚硅氧烷与菲式环戊二烯酮和苊式环戊二烯酮分别在α-氯萘中进行Diels-Alder反应,生成含有稠环侧链的聚硅氧烷.该聚硅氧烷具有较好的耐热性.将其作为组分制成高温加成型硅橡胶,综合性能达到较高水平(高模量).随着其用量的增加,可使其耐热性能得到较大改善。