摘要
对不饱和聚酯试样进行实验室人工加速老化,利用X射线光电子能谱(XPS)探讨其表面的化学结构变化,分析其老化机理。结果表明,材料经热氧老化,主链受氧气攻击生成烷氧自由基,烷氧自由基进一步形成C—O和CO,而CO经过再氧化生成OC—O,热氧老化后不饱和聚酯的表面基团主要为C—O和OC—O;材料经氙灯老化,前期的老化基团变化与热氧老化相似,后期变化主要以OC—O基团的降解为主,并生成更多的自由基,引发大分子链的进一步降解;光是不饱和聚酯材料老化降解的主要因素。
The unsaturated polyester sample were accelerate aged in the lab and XPS was used to study their aged mechanism. It was showed that after thermo-oxidative aging, the sample’s main chain was attacked by oxygen and the alkoxy radical was bulit . Alcoxyl radical came into being C—O and C=O, then the C=O was oxidized into O=C-O.The groups of C—O and C=O was the last groups on the surface of the unsaturated polyester after thermal oxidative aging.after the xenon arc aging, the previous ageing was similar to the thermo-oxidative aging, the group of O=C-O was decomposed by primarily in the later ageing, and more free radicals was built, which was able to give rise to polymer more degradation. The main influencing factor leading to the unsaturated polyester was light.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2010年第6期60-63,共4页
Engineering Plastics Application
基金
国家自然科学基金重点项目(50533060)
关键词
不饱和聚酯
加速老化
XPS
unsaturated polyester
accelerated aging
XPS
