摘要
文中对顺丁橡胶进行热氧老化研究,采用核磁共振氢谱、傅里叶变换衰减全反射红外光谱、紫外-可见光吸收光谱法3种谱学法对老化产物进行表征。追踪顺丁橡胶在老化过程中化学结构的变化,进而探究其老化机理。结果表明,顺丁橡胶的抗热氧老化能力较差,在120℃老化0.5 d时,其结构即发生明显变化,烯烃含量明显下降,生成醇及醛酮化合物,老化15 d时顺丁橡胶双键α-H已反应约97%。热氧老化反应机理为双键α-H先发生氧化形成过氧化羟基,进而氧化成醇及醛酮化合物,最终降解生成末端丙烯醛,同时双键发生自由基加成反应。以核磁共振氢谱为依据对α-H的氧化百分比进行定量分析,得出顺丁橡胶热氧老化过程的老化方程。
In this paper, thermal oxidative aging of butadiene rubber was studied. The aging products were characterized by 1H-NMR , ATR-FT-IR and UV-Vis absorption spectroscopy. Tracking the chemical structure of butadiene rubber in the aging process, and then exploring the aging mechanism. The results show that the ability of thermal oxidative aging of butadiene rubber is poor. When aging at 1 20 ℃ for 0.5 d, the structure of butadiene rubber changes obviously, and the content of alkene decreases obviously to produce alcohols,aldehydes and ketones. After 15 d aging, butadiene rubber double bond α-H has been oxidized about 97%. The reaction mechanism of thermal oxidative aging of butadiene rubber is that the double bond α-H firstly forms peroxyhydroxyl groups, and is then oxidized to alcohols and aldehyde-ketone compound, finally degrades to produce terminal a crolein. Meanwhile the radical addition reaction of double bonds happens. Based on the results of 1H-NMR , the quantitatively analysis of percent oxidation of α-H is got,then the aging equation of thermal oxidative aging of but adiene rubber is established.
作者
梁梨花
钟建永
丁玲
李志辉
邹友思
Lihua Liang;Jianyong Zhong;Ling Ding;Zhihui Li;Yousi Zou(College of Materials,Xiamen University,Xiamen 361005,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2019年第2期107-111,120,共6页
Polymer Materials Science & Engineering
