Song Lixin, Cong Fei, Wang Wei, Ren Jiannan, Chi Weihan, Yang Bing, Zhang Qian, Li Yongchao, Li Xianliang, Wang Yuanxia
Polymer High Functional Film Engineering Research Center of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China.
College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China.
Polymers (Basel). 2023 Sep 8;15(18):3696. doi: 10.3390/polym15183696.
Styrene (St) was used as comonomer and glycidyl methacrylate (GMA) as grafting monomer to prepare SEBS-g-(GMA-co-St) graft copolymers via melt grafting. Then, the graft copolymers were employed as a compatibilizer for melt blending polypropylene (PP) and hydrogenated styrene-butadiene-styrene (SEBS) triblock copolymers. The effects of the amount of GMA in the graft copolymers on thermal properties, rheology, crystallization, optical and mechanical properties, and microstructure of the blends were investigated. The results show that GMA and St were successfully grafted onto SEBS. The GMA amount in the graft copolymer significantly influenced the comprehensive properties of PP/SEBS/SEBS-g-(GMA-co-St) blends. The epoxy groups of GMA reacted with PP and SEBS, forming interfacial chemical bonds, thereby enhancing the compatibility between PP and SEBS to varying extents. After introducing SEBS-g-(GMA-co-St) into PP/SEBS blends, crystallinity decreased, crystal size increased while transmittance remained above 91% with rising GMA amount in the graft copolymers, indicating excellent optical properties. Notched impact strength and elongation at break of the blends showed a trend of first increasing and then decreasing with increased amounts of GMA in the graft copolymers. When the amount of GMA in the graft copolymers was 3 wt%, the blends exhibited optimal toughness with notched impact strength and elongation at break of 30,165.82 J/m and 1445.40%, respectively. This was attributed to the tightest dispersion interface adhesion and maximum matrix plastic deformation, consistent with the mechanical performance results.
以苯乙烯（St）作为共聚单体，甲基丙烯酸缩水甘油酯（GMA）作为接枝单体，通过熔融接枝法制备了SEBS-g-(GMA-co-St)接枝共聚物。然后，将该接枝共聚物用作聚丙烯（PP）与氢化苯乙烯-丁二烯-苯乙烯（SEBS）三嵌段共聚物熔融共混的增容剂。研究了接枝共聚物中GMA用量对共混物热性能、流变性能、结晶性能、光学性能、力学性能及微观结构的影响。结果表明，GMA和St成功接枝到SEBS上。接枝共聚物中GMA的用量显著影响PP/SEBS/SEBS-g-(GMA-co-St)共混物的综合性能。GMA的环氧基团与PP和SEBS反应，形成界面化学键，从而不同程度地增强了PP与SEBS之间的相容性。在PP/SEBS共混物中引入SEBS-g-(GMA-co-St)后，随着接枝共聚物中GMA用量的增加，结晶度降低，晶体尺寸增大，而透光率保持在91%以上，表明具有优异的光学性能。共混物的缺口冲击强度和断裂伸长率随接枝共聚物中GMA用量的增加呈现先增大后减小的趋势。当接枝共聚物中GMA的用量为3 wt%时，共混物表现出最佳韧性，缺口冲击强度和断裂伸长率分别为30165.82 J/m和1445.40%。这归因于最紧密的分散界面粘附和最大的基体塑性变形，与力学性能结果一致。
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