A STUDY ON PHASE SEPARATION PHENOMENA OF POLYMER ALLOYS

为了研究PC/PMMA、PS/SBR和PET/PP等高分子合金的相分离现象，我们建立了一套测定高分子合金相分离温度和p-v-T性质的装置，本文测定了它们的相图、热性能、讨论了各种聚合物合金的微观形态和p-v-T行为，并得出结论：低临界溶解温度（LCST）在PC/PPMA高分子合金中，DSC曲线出现两个吸热或吸热峰，分别代表组成合金的基体聚合物的玻璃化转变温度（Tg）、熔点（Tm）和比热（C_p），在PC/PPMA高分子合金中，观察到相分离前PC组分（*50wt%）的形态与细PC颗粒分散，相分离后的PET/PC共混物与大粒径PC共混物发生团聚，PET/PC共混物的v-T曲线表明，PET/PC共混物的v-T曲线与大粒径PC共混物的v-T曲线基本一致。在常压下，各含量比的PP聚合物合金均介于PET和PP本身之间，且随着PET含量的增加，合金的压缩性在固态下增大，在液态下减小。

In order to investigate the phase separarion phenomena of polymer alloys such as PC/PMMA,PS/SBR and PET/PP,we have constructed an apparatus for measuring the phase separation temperature and the p-v-T properties of polymer alloys.In this report, the phase diagrams, thermal properties, morphology and p-v-T behavior for various polymer alloys are discussed.We concluded from the above discussion that the lower critical solution temperature (LCST) was observed at PC/PMMA polymer alloys.The DSC curve for polymer alloys appeared two peaks by heat absoption or dispation in the its curve, those peaks show glass transition temperature (T_g) , melting point (T_m) and specific heat (C_p) of base polymer comprising the polymer alloys, respectively.In PC/PPMA polymer alloys, the morphology of PC component (*50wt%) before phase separation was observed dispersing with the fine PC particles, whereas it after phase separtion was observed agglomerating with the large-sized PC particles.The v-T curves of PET/PP polymer alloys in each content ratio are between PET and PP itself at atmospheric pressure.And the compressibility increased under solid state, decreased under liquid state with increasing PET content.