可光、化学降解聚苯乙烯的合成与性能研究

发布时间：2018-02-11 06:14

  本文关键词： 光降解 聚苯乙烯 酯化反应 活性聚合　出处：《高分子学报》2017年12期 　论文类型：期刊论文

【摘要】：通过1,3-二碘甲基-2-硝基苯与双(2-甲基丙酸)三硫代碳酸酯的高效聚酯化反应合成了主链中含有邻硝基苄酯和三硫代碳酸酯基团的聚合物,以其作为大分子链转移剂,进行苯乙烯的可逆加成断裂链转移(RAFT)聚合,获得了多嵌段聚苯乙烯.大分子链转移剂和多嵌段聚苯乙烯的结构及分子量通过核磁氢谱(1H-NMR)和凝胶渗透色谱(GPC)进行了表征.考察了多嵌段聚苯乙烯溶液和固态的降解性能及热性能.实验结果表明,多嵌段聚苯乙烯不仅在紫外辐照条件下可发生光降解,而且也可通过胺解和水解反应进行降解.热重分析(TGA)和示差扫描量热(DSC)结果显示,邻硝基苄酯基团和三硫代碳酸酯基团的引入,对于多嵌段聚苯乙烯玻璃化转变温度和热稳定性并没有明显的影响.
[Abstract]:Polymers containing o-nitrobenzyl and trithiocarbonate groups in the main chain were synthesized by the high performance polyesterification reaction of 1-diiodomethyl -2-nitrobenzene with bis-2-methyl-propionic acid) trithiocarbonate, which was used as a macromolecular chain transfer agent. The reversible addition chain transfer chain transfer polymerization (RAFT) of styrene was carried out. Multiblock polystyrene was obtained. The structure and molecular weight of macromolecular chain transfer agent and multiblock polystyrene were characterized by 1H-NMRs and GPC. Degradation and thermal properties. Experimental results show that, Multiblock polystyrene can be degraded not only by UV irradiation, but also by amination and hydrolysis. The results of thermogravimetric analysis (TGA) and differential scanning calorimetry (DSCC) show that, The introduction of o-nitrobenzyl ester group and trithiocarbonate group has no obvious effect on the glass transition temperature and thermal stability of polystyrene.
【作者单位】： 中国科学院软物质化学重点实验室中国科学技术大学化学与材料科学学院;Department
【基金】：国家自然科学基金(基金号21474093)资助项目
【分类号】：O632.13
，

本文编号：1502385