CAJ | 학술논문

采用相对分子质量不同的聚氧化丙烯二醇（ PPG ）与甲苯二异氰酸酯合成聚氨酯预聚物，将该预聚物用甲基丙烯酸-2-羟乙酯（ HEMA）封端后与甲基丙烯酸甲酯（ MMA）、甲基丙烯酸丁酯（ BMA）进行自由基聚合得到一系列交联聚合物。利用红外光谱（ FT-IR）、力学性能测试及动态力学热分析（ DMTA）等手段对交联聚合物进行了表征。聚氨酯／聚甲基丙烯酸甲酯（ PU／PMMA）交联聚合物具有较高的阻尼值和较宽的阻尼温域，当两组分的质量比为5∶5时，阻尼性能最佳。 PU／PMMA 交联聚合物的拉伸强度随聚甲基丙烯酸甲酯含量的增加而增加，断裂伸长率随其含量的增加而减小；聚氨酯／聚甲基丙烯酸丁酯（ PU／PBMA）交联聚合物的拉伸强度随聚甲基丙烯酸丁酯含量的增加而减小，断裂伸长率随其含量的增加而增大。
채용상대분자질량불동적취양화병희이순（ PPG ）여갑분이이청산지합성취안지예취물，장해예취물용갑기병희산-2-간을지（ HEMA）봉단후여갑기병희산갑지（ MMA）、갑기병희산정지（ BMA）진행자유기취합득도일계렬교련취합물。이용홍외광보（ FT-IR）、역학성능측시급동태역학열분석（ DMTA）등수단대교련취합물진행료표정。취안지／취갑기병희산갑지（ PU／PMMA）교련취합물구유교고적조니치화교관적조니온역，당량조분적질량비위5∶5시，조니성능최가。 PU／PMMA 교련취합물적랍신강도수취갑기병희산갑지함량적증가이증가，단렬신장솔수기함량적증가이감소；취안지／취갑기병희산정지（ PU／PBMA）교련취합물적랍신강도수취갑기병희산정지함량적증가이감소，단렬신장솔수기함량적증가이증대。
The polyurethane prepolymer was prepared by different relative molecular mass PPG and toluene di-isocyanate. A series of crosslinked polymers were synthesized by the prepolymer with terminated HEMA, methyl methacrylate( MMA) , butyl methacrylate( BMA) by free radical polymerization reaction. The blends were charac-terized by FT-IR, DMTA and mechanical measurement. Compared with pure polyurethanes cured by alcohols or a-mines, polyurethane/polymethacrylate had better damping property, such as higher damping factor and wider damping temperature range. The polyurethane/polymethacrylate showed optimum damping property when the weight ratio of two components was 5∶5 . It was found that the tensile strength of PU/PMMA increased with PMMA content increasing, but the elongation at break decreasing. However, the tensile strength of PU/PBMA decreased, and the elongation to break increased when the content of PBMA increased.