高分子量含硫二级抗氧剂的合成及在三元乙丙橡胶中的抗氧化行为  

Synthesis of a Sulfur-bearing Secondary Antioxidant with High Molecular Weight and Its Antioxidation Behavior in EPDM

作　　者：刘庆坤 丛川波[1] 孟晓宇[1] 周琼[1] Qingkun Liu;Chuanbo Cong;Xiaoyu Meng;Qiong Zhou(College of New Energy and Materials,China University of Petroleum-Beijing,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)新能源与材料学院,北京102249

出　　处：《高分子材料科学与工程》2023年第2期10-16,共7页Polymer Materials Science & Engineering

基　　金：国家重点研发计划(2022YFC2803700):课题2(2022YFC2803702)。

摘　　要：通过热引发的2-巯基苯并咪唑(MB)与八乙烯基笼形倍半硅氧烷(OVPOSS)的硫醇-烯点击反应,合成了一种新型高分子量含硫二级抗氧剂OVPOSS@MB。通过傅里叶变换红外光谱和X射线光电子能谱证实了OVPOSS@MB的化学结构,并研究了OVPOSS@MB对三元乙丙橡胶(EPDM)的硫化特性、拉伸性能及抗氧化性能的影响。结果表明,OVPOSS@MB减缓了橡胶的硫化速度,降低了橡胶的交联程度,使得OVPOSS@MB/EPDM复合材料表现出较低的橡胶模量和较高的断裂伸长率。另外,与低分子量抗氧剂MB相比,高分子量抗氧剂OVPOSS@MB具有更高的抗迁移性能,加上OVPOSS晶格具有清除自由基的功能,使得OVPOSS@MB比MB具有更加优异的抗氧化性能。A novel high-molecular-weight sulfur-bearing secondary antioxidant,OVPOSS@MB,was synthesized by thermal-initiated thiol-ene click reaction of 2-mercaptobenzimidazole(MB)with octavinylsesquisiloxane(OVPOSS).The chemical structure of OVPOSS@MB was confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy,and the effects of OVPOSS@MB on the vulcanization characteristics,tensile properties,and oxidation resistance of EPDM were investigated.The results show that OVPOSS@MB slows down the vulcanization rate and reduces the degree of cross-linking of rubber,which makes the OVPOSS@MB/EPDM composites exhibit lower rubber modulus and higher elongation at break.In addition,compared with the low-molecular-weight antioxidant MB,the high-molecular-weight antioxidant OVPOSS@MB has higher anti-migration properties,together with the free radical scavenging function of the OVPOSS lattice,making OVPOSS@MB have more excellent antioxidation performance than MB.

关 键 词：高分子量含硫二级抗氧剂 硫醇-烯点击反应 抗迁移性 抗氧化性 

分 类 号：TQ333.4[化学工程—橡胶工业]