SBS 热氧老化动力学研究

重庆交通大学学报（自然科学版） ›› 2010, Vol. 29 ›› Issue (1): 157-161.

SBS 热氧老化动力学研究

曹雪娟¹，雷运波²

1.重庆交通大学土木建筑学院，重庆 400074;2.后勤工程学院军事建筑工程系，重庆 400041

收稿日期:2009-09-08 出版日期:2010-02-15 发布日期:2015-01-22
作者简介:曹雪娟(1979—)，女，四川邻水人，博士研究生，研究方向为筑路材料及其改性技术。E-mail:caoxuejuan@tom.com。
基金资助:
国家高技术研究发展计划项目(863 计划)(2003AA333020)

Study on Thermal Oxidative Aging Kinetics of SBS

CAO Xue-juan¹，LEI Yun-bo²

1.Shool of Civil Engineering ＆ Architecture，Chongqing Jiaotong University，Chongqing 400074，China; 2.Department of Architecture ＆ Martial Engineering，Chongqing Institute of Logistics Engineering of PLA， Chongqing 400041，China

Received:2009-09-08 Online:2010-02-15 Published:2015-01-22

摘要/Abstract

摘要： 采用原位红外技术跟踪SBS热氧化过程，同时通过热分析动力学技术计算了SBS的氧化动力学反应参数。研究表明，160℃以下时，氮气氛围中的SBS无降解断链现象发生。在氧气氛围下，SBS中的PB段发生热氧化降解及无规则断链。在300℃以下时，SBS中的PS段抗氧性能优异，无氧化发生;PB段中双键旁的α氢原子有很大活性，是氧化反应的进攻点，其热氧化降解同时存在解聚和无规断链，自动氧化反应是SBS热氧老化的主要特征，反应机理为自由链式，反应过程包括链引发、链增长和链终止，反应经过初始自由基的诱导期后，SBS迅速被氧化并发生严重降解。

关键词: SBS热氧化, 原位红外, 热分析动力学, 自动氧化

Abstract: The thermal oxidation process of SBS is tracked by in-situ FTIR; meanwhile，the reaction parameters of SBS oxidation kinetics are calculated by thermal analysis kinetics. The results show that there is no chain scission and degradation occurred in nitrogen atmosphere below 160℃; while，in oxygen atmosphere，thermal oxidative degradation and random chain scission occur in PB segment of SBS; PS segment of SBS has excellent anti-oxidation performance and it can’t be oxidized when temperature is below 300℃. The α-H beside the double-bond has great activity，which is easy to be oxidized. The results also show that both of chain scission and de-polymerization occur in the thermal oxidation reaction. Auto-oxidation is the main feature of SBS thermal aging oxidation process. The mechanism of the reaction is freely-chained reaction， which includes chain initiation，chain growth and chain termination. After the reaction experiences the induction period of initial free radical，SBS is oxidized rapidly and degraded severely.

Key words: thermal oxidation of SBS, in-situ FTIR, thermal analysis kinetics, auto-oxidation

中图分类号:

曹雪娟，雷运波. SBS 热氧老化动力学研究[J]. 重庆交通大学学报（自然科学版）, 2010, 29(1): 157-161.

CAO Xue-juan，LEI Yun-bo. Study on Thermal Oxidative Aging Kinetics of SBS[J]. Journal of Chongqing Jiaotong University(Natural Science), 2010, 29(1): 157-161.