摘要
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.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2014年第1期141-149,共9页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51073137)资助项目
关键词
聚苯硫醚
低熔点玻璃
熔融液-液复合
动态力学分析
拉伸强度
Polyphenylene sulfide, Low melting-temperature glass, Liquid-liquid melt compounding,Dynamic mechanical analysis, Tension strength