Preparation of POE/PS Blends with Fine Particle Sizes by Diffusion and Subsequent Polymerization of Styrene in POE Pellets  

作　　者：wei-jia wang cheng-huan huang 郭朝霞 于建 

机构地区：[1]Key Laboratory of Advanced Materials (Ministry of Education), Department of Chemical Engineering, Tsinghua University, Beo'ing 100084, China

出　　处：《Chinese Journal of Polymer Science》2017年第8期939-949,共11页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51173095)

摘　　要：Ethylene-α-octene copolymer （POE）/polystyrene （PS） blend pellets with fine particle sizes were prepared by diffusion and subsequent polymerization of styrene in POE pellets through a one-pot procedure. The effects of the amounts of styrene and BPO on PS content, monomer efficiency and monomer conversion were investigated. The blend pellets were characterized by Micro-FTIR and FESEM, showing homogeneous diametrical distributions of PS and particle size. After melt-processing into rods, the average particle sizes are almost doubled, but still in submicron scale. Compared to neat POE rods, the blend rods with PS content higher than 15% exhibit improved tensile modulus and tensile strength without significantly losing ductility, being attributed to the small sizes, complex nature of particles and the existence of POE-g-PS copolymer that result in good interfacial adhesion. POE/PS pellets were compared with the previously reported PP/PS pellets, and the differences between the two systems are attributed to the different morphology of the two matrices： POE is completely amorphous at the diffusion and polymerization temperature, while iPP is semicrystalline. Without efficient impediment of the crystal lamellae in POE pellets, styrene diffuses easily in POE pellets.Ethylene-α-octene copolymer （POE）/polystyrene （PS） blend pellets with fine particle sizes were prepared by diffusion and subsequent polymerization of styrene in POE pellets through a one-pot procedure. The effects of the amounts of styrene and BPO on PS content, monomer efficiency and monomer conversion were investigated. The blend pellets were characterized by Micro-FTIR and FESEM, showing homogeneous diametrical distributions of PS and particle size. After melt-processing into rods, the average particle sizes are almost doubled, but still in submicron scale. Compared to neat POE rods, the blend rods with PS content higher than 15% exhibit improved tensile modulus and tensile strength without significantly losing ductility, being attributed to the small sizes, complex nature of particles and the existence of POE-g-PS copolymer that result in good interfacial adhesion. POE/PS pellets were compared with the previously reported PP/PS pellets, and the differences between the two systems are attributed to the different morphology of the two matrices： POE is completely amorphous at the diffusion and polymerization temperature, while iPP is semicrystalline. Without efficient impediment of the crystal lamellae in POE pellets, styrene diffuses easily in POE pellets.

关 键 词：BLENDS Mechanical properties Nanostructured polymers POLYSTYRENE 

分 类 号：TQ317[化学工程—高聚物工业]