CAJ | 학술논문

采用一种新型的扩链剂乙烯脲（ EU），在聚氨酯硬段引入具有刚性环状二取代脲基团，通过控制脲含量、交联度以及软段相对分子质量来制备一系列的EU改性水性聚氨酯脲（ PUU?EU），并利用透射电镜（ TEM ）、广角 X 射线衍射（ WAXD ）、动态力学机械分析（ DMA ）、热失重分析（ TGA）等测试方法，系统地研究PUU?EU微观结构与氢键化程度、微相分离、耐热性、力学强度的关系，并与1，4?丁二醇（BDO）扩链制备的水性聚氨酯（WPU）进行对比。结果表明，在一定范围内， PUU?EU随脲含量增加，其氢键化程度愈发完善，微相分离程度随之增加，力学强度逐步提高。
채용일충신형적확련제을희뇨（ EU），재취안지경단인입구유강성배상이취대뇨기단，통과공제뇨함량、교련도이급연단상대분자질량래제비일계렬적EU개성수성취안지뇨（ PUU?EU），병이용투사전경（ TEM ）、엄각 X 사선연사（ WAXD ）、동태역학궤계분석（ DMA ）、열실중분석（ TGA）등측시방법，계통지연구PUU?EU미관결구여경건화정도、미상분리、내열성、역학강도적관계，병여1，4?정이순（BDO）확련제비적수성취안지（WPU）진행대비。결과표명，재일정범위내， PUU?EU수뇨함량증가，기경건화정도유발완선，미상분리정도수지증가，역학강도축보제고。
Disubstituted cyclic urea group was introduced in polyurethane hard segment by using a novel chain extender?ethylene urea ( EU) . A series of the EU modified aqueous polyurethane urea dispersions( PUU?EU) was prepared by controlling the urea content,degree of crosslinking and the soft segment molecular weight. The relation?ship between microstructure of PUU?EU and degree of hydrogen bonding, microphase separation, heat resistance, mechanical strength, etc. was charactered by TEM,WAXD,DMA,TGA. It was compared with WPU which was u?sing BDO as chain extender. The experimental results showed that, with urea content increasing in PUU?EU sam?ples,the degree of hydrogen bonding become increasingly perfect, microphase separation also increased and the me?chanical strength improved gradually.