笼状硅氧烷/硅橡胶复合材料的非等温结晶性能  

Nonisothermal crystallization properties of polyhedral oligomeric silsesquioxane/silicone rubber composites

作　　者：刘玲[1] 周铮[1] 丁雪佳[1] 张立群[1] 

机构地区：[1]北京化工大学北京市新型高分子材料制备与加工重点实验室,北京100029

出　　处：《合成橡胶工业》2007年第4期270-274,共5页China Synthetic Rubber Industry

基　　金：教育部科学技术研究重点资助项目(03023)

摘　　要：采用溶液共混法制备了笼状硅氧烷低聚物(POSS)/硅橡胶复合材料,用差示扫描量热仪在不同降温速率下研究了POSS/硅橡胶复合材料的非等温结晶性能,考察了POSS质量分数分别为5%(试样P5)、10%(试样P10)和30%(试样P30)时对复合材料非等温结晶参数和活化能的影响,并选用Ozawa及Ozawa-Avrami联合法对POSS/硅橡胶的非等温结晶性能进行了分析。结果表明,Ozawa-Avrami联合方法适合描述POSS/硅橡胶的非等温结晶现象;POSS/硅橡胶复合材料成核速率的大小依次为P5、P15和P30,生长速率则相反,而结晶速率大小依次为P30、P5和P15。The octaisobutyl- polyhedral oligomeric silsesquioxane （POSS）/silicone rubber（MVQ） composites were prepared by the solution mixing method. The nonisothermal crystallization of POSS/MVQ was studied using cooling at different rate by differential scanning calorimetry. The effects of POSS content on the nonisothermal crystallization parameters and activation energy of POSS/MVQ composites were studied. Two kinds of the models, Ozawa and Ozawa-Avrami, were chosen to describe the nonisothermal crystallization of POSS/MVQ composites. The results showed that the combined Ozawa-Avrami approach could satisfactorily explain the phenomenon of the crystallization, the sequence of nucleation speed from fast to slow was P 5,P 15 and P 30, growth speed was contrary, crystallization speed from fast to slow was P 30,P 5 and P 15.

关 键 词：8-异丁基-笼状硅氧烷 硅橡胶 非等温结晶 Ozawa-Avrami模型 

分 类 号：TQ330.7[化学工程—橡胶工业]