热分析动力学方法研究SEBS化学交联的机理  

Mechanism of SEBS Chemical Cross Linking Studied by Thermal Analysis Kinetics Method

作　　者：周涛[1] 张爱民[1] 徐建波[1] 邬智勇[2] 夏金魁[2] 梁红文[2] 

机构地区：[1]高分子材料工程国家重点实验室四川大学高分子研究所,四川成都610065 [2]中国石化巴陵石油化工有限责任公司,湖南岳阳414014

出　　处：《高分子材料科学与工程》2008年第4期117-120,共4页Polymer Materials Science & Engineering

基　　金：国家高技术研究发展项目(863计划)(2003AA333020)

摘　　要：采用非等温多个扫描速率的热分析动力学方法,利用差示扫描量热仪(DSC)线性升温数据,详细研究了部分氢化的聚苯乙烯-聚丁二烯-聚苯乙烯三嵌段共聚物(SEBS)在交联剂双叔丁基过氧化二异丙苯(BIPB)存在下的化学交联机理模型。根据Friedman微分法和非线性回归得到了精确的交联反应机理模型,并得到了确切的动力学方程和动力学参数。研究发现,BIPB引发的SEBS交联经历了明显的三步反应,BIPB的分解反应是交联反应的控制步骤。根据机理模型的计算发现,为了得到适应不同应用范围的交联SEBS,需要根据不同的情况选择合适的交联温度,控制适当的反应时间来得到相应交联程度的SEBS产品。热分析动力学是筛选合适交联剂,选择最优交联反应条件的有效手段。The mechanism of polystyrene-block-poly （ ethylene-co- 1-butene）-block-polystyrene three block copolymer （SEBS） chemical cross linking was studied by non-isothermal analysis kinetics method combined with the linear heating-up data of DSC with several scan speed rate. BIPB was the cross linker in SEBS cross linking reaction. The precise mechanism models were obtained by using Friedman differential method and nonlinear regression method in our research, as well as the precise kinetics equations and parameters. We discoverde that the cross linking reaction of SEBS initiated by BIPB explicitly has three steps, and the decomposition reaction of BIPB is the control method in the cross linking reaction. From the calculations of the mechanism models, it can be proved that, in order to gain the cross linked SEBS of various availabilities, according to the requirements, one should choose a suitable cross linking temperature and a suitable reaction time to obtain a type of SEBS with a certain cross linking degree. Thermal analysis kinetics method is an effective way to choose the suitable cross linker and to deter mine optimum factors of the cross linking reaction.

关 键 词：热分析动力学 非等温 SEBS 化学交联 机理 

分 类 号：TQ316.64[化学工程—高聚物工业]