摘要
本文研究了一种新型的BA/MMA/AA/Zn^(++)AA三元共聚丙烯酸酣类锌盐离子聚合物的熔体流变学性能和力学性能。结果表明:离子含量小于8mol％时,对于两组丙烯酸含量不同的离子聚合物,其熔体表观粘度与离子含量的定量关系分别为:ηα(i)=ηα(O).exp[0.0872(i)](AAmol％=7.92),ηα(i)=ηα(O).exp [0.2350(i)](AAmol=14.41);所研究的离子聚合物在离子含量小于15mol％时,都为幂律流体,大于15mol％时呈复杂流体。离子聚合物有两个表观粘流活化能,其转折温度在90～100℃之间;低温区域的活化能随离子含量增加而增加;高温区域则随离子含量增加先是增加而后下降。扭辫分析(TBA)结果表明:少量金属离子加入使离子聚合物的相对刚度增加,α松弛变宽且向高温方向移动;用GPG研究发现离子聚合物的表观分子量随离子含量变化很独特;离子聚合物对聚酯膜的剥离强度(最大值)达10～25N/25mm,故这种离子聚合物可望成为一种有前途的热熔压敏胶。
This paper describes the melt rheologlcal and mechanical properties of a Zn^(++) ionomer derived from butyl acrylate/methyl methacrylate/acryllc acid. The apparent melt viscosity of the ionomer was studied as a function of its theoretic neutralization degree and its temperature by using a capillary rheometor. The results showed that there was a linear relationship between the logarithmic apparent melt viscositty and ion content when the ion content was less than 8 mol％. The ionomer was all power law fluid when ion content was less than 15 mol％, when ion content was greater than 15 mol％ the ionomer was a complex fluid. In the lower temperature region, the apparent activation energy increased with the ion content, but the variation of evaluated apparent activation energy with ion content was first increased and then decreased. The results obtained by means of TBA showed that the relative stiffness of the ionomer increased and Tg peak moved to higher temperatures and was brgadened with increasing ion content. The ionomer was observed by GPC to have a dramatic variation of apparent molecular weight with ion content. The ionomer will be a new hot melt pressure sensitive adhesive because of its peel strengh to PET film was 10-25 N/25 mm.
