文档介绍：分类号 U D C 中南大学 CENTRAL SoUTH IJNlVERSITY 密级编号硕士学位论文论文题目:聚氯酯改性竖氯挝脂的剑餐及烛直S硒究学科、专业:???.材料学??~ 研究牛姓名: 任冬燕导师姓名及专业技术职务:???.李芝华?.量t数援?????. 中南火:学硕士学位摘要摘要本研究以聚醚二元醇(PPO)、甲苯二异氰酸酯(TDI)作为原料, 在催化剂有机锡的作用下,于70。C左右合成了具有较好柔顺性、优异的低温性能和耐水解性的聚醚型聚氨酯预聚体。采用该预聚体和扩链剂1,4-丁二醇(1,4-BDO)、交联剂三羟甲基丙烷(TMP)对环氧树脂进行改性,制各了互穿网络结构的聚氨酯环氧树脂体系。本实验采用电子万能试验机、冲击试验机对聚氨酯改性环氧树脂体系进行拉伸强度、冲击强度测定,并通过SEM对冲击断口进行了分析;通过红外光谱对改性体系进行了结构表征,探讨了聚氨酯对环氧树脂改性的过程中可能发生的反应种类及反应机理;通过场发射SEM分析了聚氨酯改性环氧树脂材料的两相相容性及形貌特征; 通过TG曲线对改性材料的热稳定性进行了测定分析,探讨了聚氨酯加入量及不同种类环氧树脂对改性材料的热性能影响;同时通过测定纯环氧树脂体系和聚氨酯改性环氧树脂体系固化过程的DSC蓝线, 确定了改性材料最佳固化条件,初步研究了两体系的固化反应动力学,测定了其表观活化能。此外,本实验重点研究了不同分子量的聚醚二元醇及不同聚氨酯含量对改性体系各项性能的影响,还对比了不同环氧树脂和不同固化剂对改性体系性能的影响。本研究结果表明:以聚醚型聚氨酯为改性原料制备的互穿网络结构的聚氨酯环氧树脂体系,其冲击强度、拉伸强度及热稳定性与纯环氧树脂固化物相比,均有较大程度的提高,采用此方法对环氧树脂进行增强、增韧、耐热改性是完全可行的。实验结果表明:以环氧树脂TDE一85和甲基四氢苯酐(MeTHPA)为环氧树脂原料,以分子量为1000的聚醚二元醇制备聚氨酯(PU)预聚体且当聚氨酯含量为15%时,改性环氧树脂体系的耐热性和综合力学性能最好,与纯环氧树脂体系相比有显著提高。关键词环氧树脂,聚氨酯,改性,互穿网络中南大学硕十学位 ABSTRACT ABSTRACT In this research,the polypropylene glycol(PPG)and toluene diisocyanate(TDI)were selected asraw materials,in thehelp anic polyether-type polyurethane with good flexibility, low..temperature characters and anti—hydrolysis attributes was synthesized at70℃.Extended reagent of 1,4butanediol,cross linker reagent of three hydroxymethyl groups ofpropane(TMP)and the prepared PU monomer were added totheepoxy resin formodification, thePU and EPIPN system was eventually prepared. The electronic powerful testing machine and impacting testing machine were applied to examine the tensile strength and impact strength,and the scan electronic microscopic(SEM)was applied to analyze characterization ofthe IPN structure was performed by theIR method;the patibility and pattern features of tWO phase was analyzed by felidemission SEM;thethermal stability ofthemodified materials was determined by TG method,the influence ofthe PU proportion prepolymer and type ofEP on the thermal stability ofmodified materials was discussed indetail,while the optimum curi