Photocrosslinking of halogen‐free flame‐retarded ethylene‐vinyl acetate copolymer by phosphorous‐nitrogen compound NP28
Photocrosslinking of halogen‐free flame‐retarded ethylene‐vinyl acetate copolymer by phosphorous‐nitrogen compound NP28
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DOI：
10.1002/app.30539
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发表时间：
2009-10
影响因子：
3
通讯作者：
Qianghua Wu;B. Qu;Mei Sun
中科院分区：
文献类型：
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作者：
Qianghua Wu;B. Qu;Mei Sun
通过凝胶测定、热延伸试验、热重分析、力学性能测试和热老化试验，研究了在光引发剂和交联剂存在下，磷氮化合物NP 28对无卤阻燃乙烯-醋酸乙烯酯共聚物（伊娃）的光引发交联及其相关性能的表征。研究了伊娃/NP 28共混体系的光交联效率及光引发剂、交联剂、NP 28含量、辐照温度等因素对交联过程的影响，并通过比较凝胶含量对交联效率进行了优化。结果表明，在最佳条件下，当NP 28填充量为28.2wt%、厚度为1.6mm时，在4.8s的紫外光照射下，伊娃/NP 28共混物的凝胶含量可达到80wt%以上。热重分析、力学性能测试和热老化测试的数据表明，光交联的伊娃/NP 28共混物的热稳定性和力学性能明显优于未光交联的共混物。应用聚合物科学杂志，2009年
The photoinitiated crosslinking of halogen-free flame-retarded ethylene-vinyl acetate copolymer (EVA) by the phosphorous-nitrogen compound NP28 in the presence of photoinitiator and crosslinker and characterization of the related properties have been investigated by gel determination, heat extension test, thermogravimetric analysis (TGA), mechanical measurement, and thermal aging test. The photocrosslinking efficiency of EVA/NP28 blend and various factors affecting the crosslinking process, such as photoinitiator, crosslinker, NP28 content, and irradiation temperature, were studied in detail and optimized by comparison of gel content. The results show that the EVA/NP28 blend filled with 28.2 wt % NP28 with a thickness of 1.6 mm is homogeneously photocrosslinked to a gel content of above 80 wt % with 4.8 s UV-irradiation under optimum conditions. The data from TGA, mechanical measurement, and thermal aging test give evidence that the thermal stability and mechanical properties of photocrosslinked EVA/NP28 blend are much better than those of the unphotocrosslinked one.© 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009