Characterization of shape memory silane cross-linked low-density polyethylene prepared by solid-phase grafting process,Journal of Applied Polymer Science

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Characterization of shape memory silane cross-linked low-density polyethylene prepared by solid-phase grafting process
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-02-18 , DOI: 10.1002/app.52282
Shuo Li ₁ , Peirou Chen ₁ , Dewen Zhou ₁ , Mengqi Hou ₁ , Shanke Wan ₁ , Qian Cheng ₁ , Dongtao Yu ₁

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Silane cross-linking is a conventional process to improve the properties of polyethylene, and the most common process is completed by two-step methods including melt grafting and hydrolytic cross-linking. In this work, silane cross-linked low-density polyethylene (SXLPE) was prepared via solid-phase grafting copolymerization for the grafting of vinyl trimethoxysilane (VTMS) onto low-density polyethylene (LDPE). The grafting efficiency and cross-linking efficiency were determined by infrared analysis and gel content measurement, and the properties of the materials were evaluated by differential scanning calorimetry (DSC), X-ray diffraction (XRD) studies, thermogravimetric analysis (TGA), mechanical performance test, and shape memory behavior characterization. As the benzoyl peroxide (BPO) content changes from 0.1 to 0.5 phr, the SXLPEs exhibit an increase of cross-linking degree determined by gel content, a slight decrease of crystallinity, an improvement of thermal stability, and enhancement of elastic modulus, and more chain entanglement. The solid-phase grafting copolymerization retains substantial crystal regions of LDPE, which makes it show good shape memory properties, reaching 95% shape fixity ratio and 87% shape recovery ratio.

中文翻译：

固相接枝工艺制备形状记忆硅烷交联低密度聚乙烯的表征

硅烷交联是提高聚乙烯性能的常规工艺，最常见的工艺是通过熔融接枝和水解交联两步法完成。在这项工作中，通过固相接枝共聚制备硅烷交联低密度聚乙烯（SXLPE），用于将乙烯基三甲氧基硅烷（VTMS）接枝到低密度聚乙烯（LDPE）上。通过红外分析和凝胶含量测量确定接枝效率和交联效率，并通过差示扫描量热法（DSC）、X射线衍射（XRD）研究、热重分析（TGA）、力学性能评价材料的性能。性能测试和形状记忆行为表征。随着过氧化苯甲酰 (BPO) 含量从 0.1 到 0.5 份变化，SXLPEs表现出由凝胶含量决定的交联度增加，结晶度略有下降，热稳定性提高，弹性模量提高，以及更多的链缠结。固相接枝共聚保留了LDPE的大量晶体区域，使其表现出良好的形状记忆性能，达到95%的形状固定率和87%的形状恢复率。

更新日期：2022-02-18

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