甲基丙烯酸羟乙酯改性乙烯-α-烯烃共聚物封装胶膜

Preparation and Properties of Ethylene-α-Olefin Copolymer Encapsulation Films Modified with Hydroxyethyl Methacrylate

以甲基丙烯酸羟乙酯(HEMA)、苯乙烯(St)和γ-甲基丙烯酰氧丙基三甲氧基硅烷(KH570)为接枝单体,熔融接枝乙烯-α-烯烃共聚物(POE)制备POE-g-P(HEMA-co-St)(以下简称POE-g-PHS)和POE-g-P(HEMA-co-St-co-KH570)(以下简称POE-g-PHSK)。以过氧化-2-乙基己基碳酸叔丁酯(TBEC)为交联剂、POE-g-PHS和POE-g-PHSK为改性剂,分别加入POE基材中,经熔融共混和层压交联制备POE/POE-g-PHS胶膜和POE/POE-g-PHSK胶膜,研究了POE-g-PHS和POE-g-PHSK对胶膜的结构和性能的影响。结果表明,随着POE-g-PHS和POE-g-PHSK含量的增加,POE预制膜的防交联剂迁移能力明显提升;同时,POE胶膜交联度的提升和结晶度的变化也影响其综合性能。当POE-g-PHS和POE-g-PHSK质量分数分别为9%和6%时,综合性能最优。预制膜表面摩擦系数变化率从17.13%分别降低到0.53%和0.49%,胶膜交联度从86.28%分别提高至89.87%和90.91%,剥离强度从12.86 N/cm分别提升至20.86 N/cm和32.14N/cm,同时,抗紫外老化性能、力学性能和体积电阻率等性能均有提升。

Hydroxyethyl methacrylate(HEMA),styrene(St)andγ-methacryloxypropyl trimethoxy silane(KH570)were used as grafting monomers to prepare POE-g-P(HEMA-co-St)(POE-g-PHS)and POE-g-P(HEMA-co-St-co-KH570)(POE-g-PHSK)by melt-grafting reaction.The POE/POE-g-PHS and POE/POE-g-PHSK films were prepared by melt blending and laminated crosslinking with 2-ethylhexyl carbonate peroxide(TBEC)as crosslinking agent.The effects of POE-g-PHS and POE-g-PHSK on the structure and properties of the films were studied.The results show that the migration of crosslinking agent in the POE prefabricated films is significantly reduced with the increase of POE-g-PHS and POE-g-PHSK content.At the same time,the improvement of the crosslinking degree and change of crystallinity of the film also affects its comprehensive performance.When the mass fraction of POE-g-PHS and POE-g-PHSK is 9%and 6%respectively,the comprehensive performance is optimal.The change rate of surface friction coefficient of the prefabricated films decreases from 17.13%to 0.53%and 0.49%respectively.The crosslinking degree of the film increases from 86.28%to 89.87%and 90.91%respectively.The peel strength increases from 12.86 N/cm to 20.86 N/cm and 32.14 N/cm respectively.At the same time,the ultraviolet aging resistance,mechanical properties and volume resistivity are improved.