高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (9): 1853.doi: 10.7503/cjcu20150141

• 高分子化学 • 上一篇    

丙烯腈-苯乙烯共聚物对聚甲醛的热稳定化作用

刘经纬, 郭朝霞, 于建   

  1. 清华大学化工系, 先进材料教育部重点实验室, 北京 100084
  • 收稿日期:2015-02-11 出版日期:2015-09-10 发布日期:2015-06-30
  • 通讯作者: 于建,男,博士,教授,博士生导师,从事高分子纳米复合材料等方面的研究.E-mail:yujian03@mail.tsinghua.edu.cn E-mail:yujian03@mail.tsinghua.edu.cn

Influence of Acrylonitrile-styrene Copolymer on the Thermal Stability of Polyoxymethylene Resin

LIU Jingwei, GUO Zhaoxia, YU Jian   

  1. Key Laboratory of Advanced Materials, Ministry of Education, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2015-02-11 Online:2015-09-10 Published:2015-06-30

摘要:

研究了丙烯腈-苯乙烯(AS)共聚物对聚甲醛(POM)的热稳定化作用. 结果表明, 在动态混炼条件下, 添加少量的AS共聚物可使POM的熔体稳定性和熔融滞留时间明显增大, AS最优添加质量分数为3%; 在静态加热条件下, AS的加入可使POM在升温过程中的分解温度显著提高, 在恒温过程中的失重率明显降低. 在动态或静态条件下, AS共聚物对POM热稳定性的贡献效果一致, 并且同时加入AS和三聚氰胺对POM的热稳定性改善更为显著. 红外分析结果表明, AS对POM的热稳定化作用源于分子链上的氰基对甲醛的有效吸收.

关键词: 聚甲醛, 丙烯腈-苯乙烯共聚物, 热稳定性

Abstract:

The influence of acrylonitrile-styrene(AS) copolymer on the thermal stability of polyoxymethylene(POM) resin was studied. It was shown that, under dynamic melt blending conditions, the thermal stability of POM melt and the molten residence time could be significantly improved by adding just a small amount of AS, and the optimal mass fraction is 3%. Under static heating conditions, the addition of AS leads to a significant increase in decomposition temperature of POM system during the elevated temperature process, and an apparently decrease in the mass loss rate during the constant temperature process. In both dynamic and static conditions, the contribution of AS to the thermal stability of POM is similar, and the effect is even more signi-ficant by the combined use of AS and melamine. IR analysis revealed that the mechanism of the thermal stabilization of POM resin is the efficient absorption of formaldehyde by the -CN groups of AS copolymer.

Key words: Polyoxymethylene, Acrylonitrile-styrene(AS) copolymer, Thermal stability

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