高抗冲聚苯乙烯的形态与性能

The Morphology and Property of High Impact Polystyrene

本文用甲苯/丁酮混合溶剂对四种国产高抗冲聚苯乙烯(HIPS)进行了溶解—离心分离;测定了溶胶和凝胶含量;用透射电子显微镜研究了HIPS及其凝胶组分的形态结构;用动态力学方法测定了四个试样的转变与松弛过程。结果表明:试样1的分散相区尺寸较小,聚丁二烯与聚苯乙烯接枝率较高,因而具有较大的冲击强度。另外三个试样的橡胶分散相区尺寸较大,聚丁二烯与聚苯乙烯间接枝率较低,因而冲击强度较低。在试样1的动态力学性能谱上一40℃左右有一个相应于接枝点的分子松驰过程,而另外三个试样则检测不到这一松驰过程。

Four HIPS materials made in China were dissolved—centrifugalized with toluene/methyl ethyl ketone mixed solvent; the contents of the soluble and gel parts were determined; the micrographs of HIPS samples and the gels were examined by means of TEM; the transition and relaxation of the four HIPS samples were studied by dynamic mechanical method; the results showed the domain demension of dispersed phase in sample 1 was smaller than those in the other three samples; the graft ratio between polybutydiene (PB) and polystyrene (PS) in sample 1 was higher than those in other three, resulting in a higher impact strength. A relaxation process associated with the grafting molecular motion was observed at—40℃ on the dynamic mechanical relaxation spectra of sample 1, while there was no such a process on the spectra of the other three samples.