摘要
采用非等温差示扫描量热(DSC)分析法,在交联剂过氧化二苯甲酰(BPO)存在下,对部分氢化的苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SEBS)的化学交联过程进行了热分析动力学研究,在不同升温速率下获得SEBS交联反应的DSC升温曲线,采用Model-free(无模型)分析法包括Friedman、Ozawa-Flynn-Wall和Kissinger等三种方法分别对SEBS交联反应进行了热动力学分析,求出其动力学初始参数值,然后用Model-fitting(模型拟合)分析法通过选择动力学模型,采用多元非线性回归优化得到了精确的模型参数。所得动力学模型表明BPO引发的SEBS交联过程经过了三步反应,每步反应的活化能依次减少。此优化的动力学模型可用来预测不同温度下反应时间和交联度之间的关系,表明可通过控制交联温度和反应时间得到所需交联程度的SEBS产品,从而达到其性能设计的目的。
The non-isothermal crosslinking of hydrogenated styrene-butadiene-styrene block copolymer （SEBS） in present of benzoyl peroxide （BPO） was studied by differential scanning calorimetry （DSC） analysis. The thermal kinetics of the reaction was analyzed using model-free methods including Friedman, Ozawa-Flynn-Wall, and Kissinger methods and the initial kinetic parameters were calculated. The precise parameters were also obtained by using model-fitting method via multivariate nonlinear regression analysis. Three steps in the crosslinking reaction of SEBS were identified with the activation energies becoming smaller. It showed that the crosslinking degree of SEBS could be controlled by varying the reaction temperature and time.
出处
《中国塑料》
CAS
CSCD
北大核心
2009年第10期45-49,共5页
China Plastics
