摘要
以聚醚二元醇(PTMG)与二环己基甲烷二异氰酸酯(HMDI)反应,生成以异氰酸酯基(-NCO)封端的聚氨酯预聚体,然后与环氧树脂(E-44)反应,合成了韧性好、相对分子质量大小及其分布合理、力学性能优异的聚氨酯改性环氧树脂,探讨了原料摩尔比、稀释剂用量和合成工艺等因素对树脂性能的影响,研究结果表明,当原料摩尔比n(HMDI)∶n(PTMG)∶n(E-44)=2.3∶1∶2,稀释剂丙烯酸异冰片酯(IBOA)用量为20%,合成条件为65℃×2 h+75℃×50 min时,可以得到黏度为3.06×10~5 mPa·s (25℃)、M_n为1400、M_w为2900、相对分子质量分布宽度指数为2.07的聚氨酯改性环氧树脂。通过红外光谱、核磁共振碳谱和凝胶渗透色谱对其结构进行表征,结果与设计的一致,达到了预期效果,其拉伸强度、冲击强度、弯曲强度、储能模量(E′)、损耗模量(E″)、玻璃化转变温度(T_g)等综合性能优异。
The polyether diol(PTMG)reacted with dicyclohexylmethane diisocyanate(HMDI)to form a polyurethane prepolymer terminated with isocyanate group(-NCO),and then reacted with epoxy resin(E-44)to synthesize a polyurethane modified epoxy resin with good molecular weight,reasonable distribution and excellent mechanical properties.By investigating the effects of raw material mole ratio,diluent dosage and synthesis processing on the properties of the resin,the results show that when the raw material mole ratio n(HMDI)∶n(PTMG)∶n(E-44)=2.3∶1∶2,the amount of diluent isobornyl acrylate(IBOA)is 20%,and the synthesis condition is 65℃×2 h+75℃×50 min,the viscosity can be obtained as 3.06×105 mPa·s(25℃),Mn as 1400,Mw as 2900.And the polyurethane modified epoxy resin has a molecular weight distribution width index of 2.07.The structure is characterized by IR,13C-NMR and GPC.The results are consistent with the designed one and achieved the expect results.The tensile strength,impact strength,bending strength,storage modulus E′,loss modulus E″,Tg and the like are excellent.
作者
李会录
李涛
祁向花
李颖
Huilu Li;Tao Li;Xianghua Qi;Ying Li(College of Materials Science and Engineering,Xi’an University of Science and Technology,Xi’an 7100549 China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2020年第7期15-22,共8页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(51903207,21204072)
陕西省重点研发计划项目(2018GY-174,2018GY-115)。
关键词
聚氨酯
环氧树脂
合成工艺
力学性能
polyurethane
epoxy resin
synthesis process
mechanical properties
