A STUDY ON PHASE SEPARATION PHENOMENA OF POLYMER ALLOYS

为了研究PC/PMMA、PS/SBR和PET/PP等聚合物合金的相分离现象，我们搭建了一套测量聚合物合金相分离温度和p-v-T性能的装置。本文讨论了各种聚合物合金的相图、热性能、形貌和p-v-T行为。从上面的讨论我们得出结论，在PC/PMMA聚合物合金中观察到较低的临界溶解温度（LCST）。聚合物合金的DSC曲线出现两个峰，分别表示由聚合物合金组成的基体的玻璃化转变温度T_g、熔点T_m和比热C_p。在PC/PPMA聚合物合金中，相分离前PC组分（*50wt%）与细PC颗粒分散，相分离后PC组分（*50wt%）与大PC颗粒团聚。在常压下，各含量比下PET/PP聚合物合金的v-T曲线均在PET与PP本身之间。随着PET含量的增加，压缩率在固态下增大，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.