含乙烯基全氟聚醚-b-聚硅氧烷制备及其在硅橡胶中的性能  

Preparation of vinyl-containing perfluoropolyether-b-polysiloxane and its properties in silicone rubber

作　　者：吕宁宁 冯裕智 文敬滨 温萍 路明霄 唐旭东 LYU Ningning;FENG Yuzhi;WEN Jingbin;WEN Ping;LU Mingxiao;TANG Xudong(College of Chemical Engineering and Materials,Tianjing University of Science and Technology,Tianjin 300457,China;PetroChina Shanghai Advanced Materials Research Institute Co.,Ltd.,Shanghai 201306,China)

机构地区：[1]天津科技大学化工与材料学院,天津300457 [2]中石油(上海)新材料研究院有限公司,上海201306

出　　处：《复合材料学报》2025年第3期1333-1341,共9页Acta Materiae Compositae Sinica

摘　　要：耐溶剂性能差是制约硅橡胶发展与应用的重要因素之一,氟改性是解决该问题的有效手段之一。通过叔丁醇钾引发环硅氧烷阴离子开环制备了多乙烯基聚硅氧烷(Vi-PSi),与全氟聚醚硅氧烷反应制备含乙烯基全氟聚醚聚硅氧烷嵌段共聚物(PFPE-b-PMVS),采用FTIR、^(1)H NMR确定了其结构,并研究了PFPE-bPMVS对甲基乙烯基硅橡胶(MVQ)力学性能、硫化性能、耐溶剂性能和热稳定性的影响。结果表明:随着PFPE-b-PMVS含量的增加,高温硫化交联后,改性MVQ的拉伸强度先增加后降低,当PFPE-b-PMVS添加量为2wt%时,拉伸强度和断裂伸长率可达11.38 MPa和396%;焦烧时间(t10)和正硫化时间(t90)随着PFPEb-PMVS的增加而降低;耐溶剂性能随PFPE-b-PMVS添加量的增加吸附量降低,当PFPE-b-PMVS添加量为20wt%时,在对二甲苯溶剂中,吸附溶剂比未改性MVQ降低83.22%;热失重10%温度随PFPE-b-PMVS用量增加而降低。Poor solvent resistance is one of the important factors restricting the development and application of silicone rubber,and fluorine modification is one of the effective means to solve this problem.Vinyl-containing polysiloxane(Vi-PSi)was prepared by potassium tert-butanol induced cyclosiloxane anionic ring-opening,and vinylcontaining perfluoropolyether polysiloxane block copolymer(PFPE-b-PMVS)was grafted with perfluoroether siloxane.Its structure was determined by FTIR and ^(1)H NMR.The effects of PFPE-b-PMVS on mechanical properties,vulcanization properties,solvent resistance and thermal stability of methyl vinyl silicone rubber(MVQ)were studied.The results show that with the increase of PFPE-b-PMVS content,the tensile strength of modified MVQ increases first and then decreases after high temperature vulcanization crosslinking.When the addition of PFPE-b-PMVS is 2%,the tensile strength and elongation at break can reach 11.38 MPa and 396%.The coke time(t10)and positive vulcanization time(t90)decrease with the increase of PFPE-b-PMVS.The solvent resistance decreases with the increase of PFPE-b-PMVS.When the PFPE-b-PMVS added amount was 20%,the adsorption solvent in p-xylene solvent was 83.22%lower than that in unmodified MVQ.The 10%thermogravimetric temperature decreased with the increase of the dosage of PFPE-b-PMVS.

关 键 词：全氟聚醚 聚硅氧烷 改性硅橡胶 耐溶剂性能 力学性能 

分 类 号：TQ333.93[化学工程—橡胶工业] TB332[一般工业技术—材料科学与工程]