梳状支链水性聚氨酯的结构与性能  

Structure and Properties of Comb-branched Waterborne Polyurethane

作　　者：邓湘华[1] 罗远芳[1] 刘芳[1] 陈勇军[1] 贾德民[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510641

出　　处：《精细化工》2007年第12期1236-1239,共4页Fine Chemicals

基　　金：广东省自然科学基金团队项目(039172)~~

摘　　要：用梳状支链结构的聚合物二醇(CPD)和聚己内酯二醇(PCLD)共同作软段,制备了含有梳状支链结构的水性聚氨酯(CWPU),着重研究了CPD含量和梳状支链结构对CWPU力学性能、粘接性能和耐水性的影响。研究表明,随着聚合物多元醇中w(H-CPD)从0%增加到100%,CWPU的拉伸强度从46.1MPa降低到15.9MPa,断裂伸长率从651%降低到433%,吸水率从18.4%增加到49.6%,CWPU对PVC的T-剥离强度在w(H-CPD)=40%时最大,达9.58N/mm。保持聚合物多元醇中w(CPD)=40%时,随着CPD梳状支链末端烷基碳原子数从4增加到18,CWPU的T-剥离强度从7.65N/mm增加到8.21N/mm;在H-CPD/C18-CPD/PCLD为软段体系中,随着w(C18-CPD)从0%增加到40%,CWPU的粘接性能略微下降,吸水率从21.3%降低到13.1%。Waterborne polyurethane with comb-branched chains （CWPU） were prepared using polymeric diols with comb-branched chains （CPD） and polycaprolactone diols （PCLD） as soft segments. Effects of content and comb-branched structure of CPD on the mechanical property, adhesion and water-resistance of CWPU were studied. When w（H-CPD） in polyols increases from 0% to 100% , the tensile strength of CWPU decreases from 46. 1 MPa to 15.9 MPa,the elongation at break decreases from 651% to 433% , and the water absorption increases from 18.4% to 49.6%. CWPU with w （ H-CPD） =40% in soft segment has the maximum T-peel strength of 9.58 N/mm. When w（CPD） retains 40% in polyols, the T-peel strength of CWPU increases from 7.65 N/mm to 8.21 N/mm with the increase of number of carbon atoms from 4 to 18 in alkyl group located at the end of comb-branched chains;in the system with H-CPD/C18-CPD/PCLD as soft segment, the adhesion of CWPU slightly decreases and water absorption of CWPU decreases from 21.3% to 13.1% with increasing w （C18- CPD） from 0% to 40%.

关 键 词：梳状支链结构 水性聚氨酯 粘接性能 力学性能 耐水性 粘合剂 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]