乙烯基硅烷在聚乙烯中扩散行为的模拟计算  

Simulation of diffusion behavior of vinyl silane in polyethylene

作　　者：龚方红[1] 俞强[2] 汪信[1] 陆路德[1] 杨绪杰[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210014 [2]江苏工业学院材料工程系,江苏常州213016

出　　处：《计算机与应用化学》2005年第9期775-778,共4页Computers and Applied Chemistry

基　　金：江苏省自然科学基金资助项目(BK2002100).

摘　　要：通过三种硅烷(A171,A172,A151)对LDPE,LLDPE,HDPE塑料试片的渗透实验,采用浸泡称重法,得到了渗透量随时间变化的曲线,利用Fick定律测得了不同温度下的扩散系数,同时采用有限差分法法,利用Visual Basic 6.0语言,编制计算机程序,模拟了上述体系的扩散行为,得到的扩散系数与实测值一致。根据Arrhenius方程求得A171在HDPE,LDPE,LLDPE扩散活化能分别为38.2,24.0和22.0 kJ。为硅烷接枝聚乙烯过程中硅烷浸泡时间的估算建立了快速便捷的方法。The relationship of the permeating amount and time of three vinyl silanes （ Vinyl trimethoxy silane ：A171, vinyl tri-2-methoxyethoxysilane .A172, vinyl triethoxysilane： A151 ） in three different polyethylenes （LDPE, LLDPE, HDPE） was obtained by using a soak-weighing method. The diffusion coefficients at different temperatures were calculated according to Fick＇s law. Meanwhile, computer simulation of the diffusion behaviors in above systems was carried out by using the finite differences method. The diffusion coefficients were also modeled. The modeling diffusion coefficients were same as that measuerd. According to Arrhenius equation, the activation energies of the diffusion of A171 in HDPE, LDPE, LLDPE were calculated as 38.2, 24.0 and 22.0 kJ, separately. This provides a convenient method for the evaluation of the soaking time in the grafting process of polyethylene with silanes.

关 键 词：有限差分法 模拟计算 乙烯基硅烷 聚乙烯 扩散系数 

分 类 号：O631[理学—高分子化学]