低分子量聚异戊二烯的烷氧基硅封端改性

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中图分类号：TQ333.3 文献标志码：A

End-Capping Modification of Low Molecular Weight Polyisoprene with Alkoxy Silicon

MA Enwang1，MA Jil，GAO Wenxi1，LI Wei²，DING Naixiu²，HELixia² （1.CollegeofPolymer Scienceand Enginering;2.EngineeringResearch Center forHighPerformancePolymersand Molding Technology （Ministry of Education）， Qingdao University of Science and Technology， Qingdao 266042， Shandong， China）

Abstract：The low molecular weight polyisoprene （LPI） obtained byanionic polymerization was end-cappedwith3- chloropropyl alkoxysilane.Theconditions for this end-capping modification were investigated.The structureof LPI terminated with alkoxysilanewas characterizedby Fourier transform infrared spectroscopy （FT-IR），nuclear magnetic resonance spectroscopy （H-NMR），gel permeationchromatography（GPC），diferential scaning calorimetry （DC），and thermogravimetric analysis （TGA）.Additionally，the end-capping atios of the modified products were determined from 1H 1 NMR hydrogen spectra.Results indicatedthatthereactionoccurredattheendof the molecule，and hadlitleefecton the microstructure，glass transition temperature，or heat resistance of the product. However，itledto a slight decrease in the numberaverage molecular weight and an increase in the molecular weight distribution index.The end-cappngratio increased withthe increaseof termination temperature，anddecreased significantlywiththeincreaseoftheamountof3-chloropropyl alkoxysilane. When the termination was conducted at 50°C with an equivalent amount of terminator to initiator， the endcappingratio reached 91.35%

Key words： polyisoprene; anionic polymerization;alkoxy silicon; end-capping modification; functional material

随着轮胎标签法规在欧美各国的强制实施，对轮胎用原材料的环保性、轮胎复合材料的滚动阻力和抗湿滑性能都提出了更高的等级要求，功能型环保高分子材料的设计开发与应用研究备受关注[，2]。（剩余11874字）