聚甲基丙烯酸酯粘度指数改进剂的结构解析  

Structural analysis of a polymethacrylate viscosity index improver

作　　者：安文杰[1] 钱昱亨 王波 马青英 俞洁[2] AN Wen-jie;QIAN Yu-heng;WANG Bo;MA Qing-ying;YU Jie(Lanzhou Lubricating Oil R&D Institute of PetroChina,Lanzhou 730060,Gansu,China;College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou 730070,Gansu,China)

机构地区：[1]中国石油兰州润滑油研究开发中心,甘肃兰州730060 [2]西北师范大学化学化工学院,甘肃兰州730070

出　　处：《西北师范大学学报（自然科学版）》2023年第1期107-111,117,共6页Journal of Northwest Normal University(Natural Science)

基　　金：中国石油和化工行业低碳节能与高端润滑重点实验室资助项目.

摘　　要：以一种聚甲基丙烯酸酯类粘度指数改进剂为例,采用凝胶渗透色谱(GPC)、热重(TG)、红外光谱(FT-IR)和热裂解气质联用(Py-GC/MS)对聚合物的分子量、热稳定性和结构进行表征.结果表明,样品的数均分子量M_(n)为9.1×10^(4) g·mol^(-1),重均分子量M w为6.9×10^(5) g·mol^(-1),分散度D为7.6;样品在364.8℃开始分解,最大分解温度为393.7℃.该粘度指数改进剂主要为苯乙烯、甲基丙烯酸丁酯、甲基丙烯酸十二酯、甲基丙烯酸十四酯单体共聚的线性直链分子,单体比例依次为15∶20∶44∶21.本研究结果为聚甲基丙烯酸酯粘度指数改进剂的结构表征提供了一套完整、可行、简便的分析方法,也为制备高性能粘度指数改进剂提供了思路.Taking a kind of polymethacrylate viscosity index improver as an example,the molecular weight,thermal stability,and structure were characterized by using gel permeation chromatography(GPC),thermogravimetric analysis(TG),infrared spectrum(IR)and pyrolysis-gas chromatography/mass spectrometry(Py-GC/MS).The results showed that the number average molecular weight M_(n) is 9.1×10^(4) g·mol^(-1),weight average molecular weight M w is 6.9×10^(5) g·mol^(-1),and the dispersion D is 7.6.The decomposition of samples begins at 364.8℃,and the maximum decomposition temperature is 393.7℃.This viscosity index improver is mainly a linear straight chain molecule,which is copolymerized by styrene,butyl methacrylate,dodecyl methacrylate and tetradecyl methacrylate monomers,and the monomer ratio in sequence is 15∶20∶44∶21.The results of this study provide a complete,feasible and simple analytical method forthe structural characterization of polymethacrylate viscosity index modifiers,and also provide ideas forthe preparation of high performance viscosity index improvers.

关 键 词：聚甲基丙烯酸酯 粘度指数改进剂 裂解气相色谱-质谱联用 结构解析 

分 类 号：TE624.82[石油与天然气工程—油气加工工程]