聚苯硫醚/低熔点玻璃复合体系的熔融制备与力学性能

Melt Compounding and Mechanical Properties of Polyphenylene Sulfide/Low Melting-temperature Glass Composites

选取低熔点玻璃（LMTG）为无机组分，聚苯硫醚（PPS）为聚合物基体，在适宜的温度下熔融制备了复合体系（PPS／LMTG）．探讨了加工工艺对体系中LMTG无机相形态的影响，研究了加工温度低于LMTG软化温度制备的普通填充体系（PPS／LMTG300）和高于软化温度制备的熔融液．液复合体系（PPS／LMTG400）的力学性能．结果表明，对于所选择的体系，可以在325～450℃内实现有机无机相液一液复合；温度场、剪切场均影响LMTG分散相的形貌，液-液复合过程中LMTG分散相液滴在剪切场中呈现类似变形、破裂、凝聚和松弛回复等特征；与普通填充体系PPS／LMTG300相比，由液-液复合得到的PPS／LMTG400体系中无机相在复合过程中原位生成平均粒径更小的形态，其粒子基体相互作用减弱；且经过液-液复合，粒子分散性得到了较大的改善，PPS／LMTG400体系中即使含量高达66wt％，无机粒子仍然具有优良的增强效果．

Polyphenylene sulfide （PPS） with the melt temperature about 280℃ and low-melting temperature glasses （LMTG） with the soft-temperature （Ts） about 325 ℃ were used to prepare PPS/LMTG organic- inorganic hybrids by melt compounding above both characteristic temperatures. The surfaces of PPS/LMTG prepared at different processing conditions were observed by scanning electron microscope （SEM）. Meanwhile, the mechanical properties for the composites marked as PPS/LMTG300 and PPS/LMTG400 prepared below and above T of LMTG respectively were investigated. The results indicate that liquid-liquid melt compounding is feasible in a wide temperature range from 325 ℃ to 450 ℃ for the selected composites. The SEM images show that dispersed phase in situ morphologies are influenced significantly by processing temperature, shear time and the mixer rotation speed. During liquid-liquid compounding, the dispersed phase, i.e. LMTG drops, goes through a series of process of deformation, break-up, coalescence and recovery in shearing field, similar to the evolution of dispersed polymer phase in immiscible blends with sea-island structure. Compared with PPS/LMTG300, the size of in situ morphology for LMTG phase in PPS/LMTG400 obtained by liquid-liquid melt compounding is much smaller, leading to weaker interracial interaction between the filler and matrix. In addition, LMTG particles still have an excellent strengthening effect on PPS/ LMTG400 containing 66 wt% inorganic filler since particle dispersion is improved by liquid-liquid compounding.