丁基橡胶的结构对硫化胶疲劳性能的影响  

Influence of Raw Rubber Structure on Fatigue Properties of Butyl Rubber Vulcanizate

作　　者：何丽霞 瞿金磊 刘莉[1] 刘光烨[1] 刘福胜[2] 马骥[3] 孙立水[1] Lixia He;Jinlei Qu;Li Liu;Guangye Liu;Fusheng Liu;Ji Ma;Lishui Sun(Engineering Research Center for High Performance Polymer and Molding Technology,Ministry of Education,Qingdao University of Science and Technology;College of Chemical Engineering,Qingdao University of Science and Technology;College of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学高性能聚合物及成型技术教育部工程研究中心,山东青岛266042 [2]青岛科技大学化工学院,山东青岛266042 [3]青岛科技大学高分子科学与工程学院,山东青岛266042

出　　处：《高分子材料科学与工程》2021年第1期81-87,共7页Polymer Materials Science & Engineering

基　　金：青岛市博士后应用研究项目;国家自然科学基金资助项目(51972185)。

摘　　要：橡胶的机械疲劳过程复杂,影响因素众多。文中对不同微观结构的丁基橡胶进行室温屈挠龟裂实验,应用红外光谱仪和场发射扫描电子显微镜,分析了硫化胶屈挠疲劳前后分子链结构和微观形貌的变化。实验结果表明,不饱和度高的丁基橡胶硫化速度较快,屈挠过程中硫化胶表面热氧老化程度较高;相对分子质量相近的2种丁基橡胶不饱和度高的硫化胶的抗机械疲劳性能较好;屈挠龟裂过程中异相颗粒处的应力集中是导致形成龟裂裂纹的主要原因。The rubber mechanical fatigue process is very complicated,and there are many influencing factors.In this paper,flex cracking experiments were carried out on butyl rubber with different molecular chain structures at room temperature.Using FT-IR and SEM,the changes of the molecular chain structures and microscopic morphologies of vulcanized rubber were analyzed before and after the flexural mechanical fatigue.The experimental results show that the butyl rubber with higher unsaturation will vulcanize and age by thermal oxygen faster.When the molecular weight of the butyl rubber is equivalent,the vulcanizate of butyl rubber with higher unsaturation has better mechanical fatigue resistance.On the other hand,the stress concentration at the heterogeneous particles is the main factor causing the formation of cracks during the flex cracking process.

关 键 词：丁基橡胶 不饱和度 疲劳 老化 

分 类 号：TQ333.6[化学工程—橡胶工业]