硅氧烷功能化聚乙烯的合成及阻燃性能,Journal of Applied Polymer Science

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硅氧烷功能化聚乙烯的合成及阻燃性能
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-07-27 , DOI: 10.1002/app.52850
Shuang Sun ₁ , Xiaoting Peng ₁ , Hongchang Pang ₁ , Hui Niu ₁

Affiliation

为了提高聚乙烯 (PE) 的阻燃性，本工作通过两个阶段的连续工艺实现了硅氧烷官能化 PE 的有效原位合成：在第一阶段，设计了含有二氯硅烷基团的反应性烯烃单体，并将其用于乙烯催化共聚。通过齐格勒-纳塔催化剂；在第二阶段，通过将二甲基硅烷二醇（DMS）直接注入未封端的聚合溶液中，通过PE上的氯硅烷侧基与DMS上的羟基之间的反应将硅氧烷接枝到PE侧基上。由于硅氧烷燃烧产生的二氧化硅的碳化作用，接枝0.58 mol% DMS后PE的燃烧残渣在TGA测试中显着增加至20.8 wt%。然后将硅氧烷功能化的 PE 添加到 PE/氢氧化镁 (MH) 复合材料中，以研究材料的燃烧行为。通过接枝0.15 wt%的硅氧烷，PE的极限氧指数从18%提高到21%，PE/MH的极限氧指数从28%提高到30%，表明接枝硅氧烷改性后PE的阻燃性得到了提高。还发现由接枝硅氧烷基团原位产生的纳米级二氧化硅有效地帮助形成致密的MgO和无定形碳残留层。

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Synthesis and flame retardant behavior of siloxane functionalized polyethylene

To improve the flame retardancy of polyethyelene (PE), this work realized an effective in-situ synthesis of siloxane functionalized PE via continuous process with two stages: in the first stage, reactive olefin monomers containing dichlorosilane group were designed and utilized in ethylene copolymerization catalyzed by Ziegler-Natta catalyst; in the second stage, by injecting dimethylsilanediol (DMS) directly into the unterminated polymerization solution, siloxane was grafted onto PE side group via the reaction between the pendant chlorosilane groups on PE and hydroxyl on DMS. Owing to the carbonization effect of silica produced by siloxane combustion, the combustion residue of PE was significantly increased to 20.8 wt% in the TGA test after grafting 0.58 mol% DMS. The siloxane functionalized PE was then added into PE/magnesium hydroxide (MH) composites to investigate the materials burning behavior. By grafting 0.15 wt% siloxane, the limited oxygen index of PE was increased from 18% to 21% and that of PE/MH increased from 28% to 30%, indicating the flame retardancy of PE was improved with grafted siloxane modification. It was also found that the nanoscale silica in-situ generated by the graft siloxane groups efficiently assisted the formation of a dense residual layer of MgO and amorphous carbon.

更新日期：2022-07-27

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