聚苯乙烯/聚酯共混微球的制备及性能

Preparation and properties of polystyrene/polyester blended microspheres

采用相反转乳化工艺制备了亚微米级聚苯乙烯/聚酯共混微球。分析了制备机理、微球中聚酯与聚苯乙烯的相容性及微球形貌,讨论了聚酯用量对微球粒径及分布的影响,测试了共混微球的抗冲击性能、软化温度、附着性以及熔体流动性能。结果表明:微球中聚酯与聚苯乙烯构成不相容体系;共混微球表面粗糙;微球粒径及分布随聚酯用量变化显著,当聚酯质量分数约为14%、乳化剂用量为11%时[乳化剂用量为乳化剂与单体相(苯乙烯和聚酯)质量比],可以得到平均粒径365.3 nm、分散性系数为0.101的亚微米级共混微球;当聚酯质量分数为12%~18%时,随着聚酯含量的增加,共混微球的冲击强度、附着力显著增加,但熔体流动速率降低。

Polystyrene/polyester blended submicrospheres were prepared via a phase inversion emusification process.The preparation mechanism,the compatibility of polyester with polystyrene and morphology of microspheres were analyzed.The influence of the amount of polyester on particle size and size distribution of microspheres were discussed.The impact property,softening point,adhesion and melt flow of microspheres were determined.The results indicate that the polyester and polystyrene are incompatible with each other in the microspheres with rough surface.The particle size and size distribution of microspheres change with the amount of polyester.The submicron blended microspheres with an average size of 365.3 nm and a polydispersity index of 0.101 are obtained when the mass fraction of polyester and emusifier are 14%and 11%.With the increase of polyester content,the impact strength and adhesion of microspheres are improved obviously,while the melt flow rate slows when the mass fraction of the polyester ranges from 12%to 18%.