摘要
从化学反应角度和微观演变历程对未填充NR硫化胶屈挠疲劳破坏机理进行分析。红外光谱(FT-IR)结果显示,橡胶材料屈挠疲劳过程是机械引发、氧化反应和力化学反应增长的过程,且氧化反应增长为硫化胶主破坏增长过程。屈挠实验显示,硫化胶的屈挠破坏过程出现三个阶段:第一阶段机械引发产生自由基破坏为主,破坏速率较慢;第二阶段力化学和氧化破坏起到主要作用,吸氧速率控制破坏速率,速率陡增;第三阶段力化学破坏和吸氧速率都降低,破坏速率降低。采用扫描电镜(SEM)对硫化胶疲劳过程进行了微观表征,结果显示,硫化胶断面出现明显的韧带和空穴,NR硫化胶屈挠疲劳破坏是韧带和空穴交替形成和消失的过程。
The mechanism of flexural fatigue failure of unfilled NR vulcanizates was analyzed from the point of chemical reaction and microscopic evolution.FT-IR results showed that the flexural fatigue process of rubber material is the process of mechanical initiation,oxidation reaction and force chemical reaction,and the oxidation reaction grows as the main damage growth process of vulcanized rubber.Torsional flexural tests showed that the flexural failure process of vulcanized rubber appears in three stages:in the first stage,mechanical initiation of free radical damage mainly slows the rate of destruction.In the second stage,the chemical and oxidative damage plays a major role,suction oxygen rate control the rate of destruction,the rate is sharp increase.in the third stage,the chemical damage and oxygen absorption rate are reduced,the rate of damage is also decreased.The microstructures of the vulcanizates were characterized by SEM.The results showed that the vulcanizates showed obvious ligaments and cavities.Microscopically unfilled NR vulcanizates flex fatigue failure is developed by the alternating formation and disappearance of ligaments and cavities.
作者
苏俊杰
崔雪静
姜瑞玉
张文洁
赵季若
冯莺
SU Junjie;CUI Xuejing;JIANG Ruiyu;ZHANG Wenjie;ZHAO Jiruo;FENG Ying(Qingdao University of Science and Technology,Shandong Provincial Key Laboratoy of Olefin Catalysis and Polymerization/Key Laboratory of Rubber-Plastics(QUST),Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastic,Qingdao 266042,China)
出处
《弹性体》
CAS
2018年第2期31-35,共5页
China Elastomerics
基金
国家自然科学基金资助项目(51173088)
关键词
动态疲劳
疲劳机理
韧带
空穴
dynamic fatigue
mechanism of flexion fatigue
ligaments
cavities
