Gelation and Sol-Gel Reaction in Polymer Gel

研究结果分为三部分：丁二烯橡胶中的Sol-Gel反应成功地在丁二烯橡胶硫化胶中生成了二氧化硅粒子。聚合物网络形成的GPC分析采用双官能团有机硅单体/交联剂体系，采用凝胶渗透色谱(GPC)和基于Flory-Stockmayr理论和高斯链统计的方法对凝胶进行了实验分析和理论分析。这两种方法具有很好的一致性。聚硅氧烷网络在甲苯溶液中形成网络，其浓度在很大范围内变化。这样形成的凝胶被认为含有尽可能少的结构缺陷。在溶胀度和弹性模数的浓度依赖关系中观察到了交叉。考虑了捕获纠缠对弹性的影响，给出了理论预测。预测结果与实验结果吻合较好。用低聚(二甲基硅氧烷)S制备了类似的网络，其溶胀行为符合仿射模型。

The results obtained in this investigation are broken down into three parts :The Sol-Gel Reaction in Crosslinked Butadiene RubberThe reaction of to form silica particles was successfully carried out in butadiene rubber vulcanizates. Thus, in situ filled silica was found to be an excellent reinforcer of the rubber.GPC Analysis of Polymer Network FormationUsing bifunctional silicone monomer/crosslinker system, the gelation was analyzed experimentally by gel-permeation chromatography (GPC) and theoretically by our method based on the Flory-Stockmayr theory and the Gaussian chain statistics. The two approaches were in good agreement.Polysiloxane network Formation in SolutionPolysiolxane networks were prepared in toluene solution, the concentration of which was changed in a wide range. The gel thus formed was assumed to contain as small amount of structural defects as possible. The crossover was observed in the concentration dependencies of the degree of swelling and the elastic modulus. Theoretical predictions were derived, considering the effect of trapped entanglement on the elasticity. The predictions are in good agreements with the experimental results. Similar networks were prepared using oligo (dimethylsiloxane) s, and their swelling behaviors were found to be in accord with the affine model.