端胺基非异氰酸酯预聚体嵌段共聚聚醚型聚氨酯

用端胺基非异氰酸酯基聚氨酯预聚体与聚醚型聚氨酯预聚体嵌段共聚制备了改性聚醚型聚氨酯及其膜，分析了端胺基非异氰酸酯基聚氨酯预聚体，考查了聚醚型聚氨脂树脂成膜温度和预聚体NCO/ NH2配比对膜力学性能的影响，同时对比了聚氨酯材料的力学性能，采用差示扫描量热法（DSC）研究了相分离程度。结果表明，合成的端胺基非异氰酸酯基聚氨酯预聚体中成功地引入了氨基甲酸酯基团；最佳成膜温度为140 ℃；当预聚体NCO/NH2=1/0.9（摩尔比，下同）时膜的性能最好，拉伸强度为25.1 MPa，伸长100 %模量为5 MPa，；与普通聚氨酯相比，端胺基非异氰酸酯基聚氨酯预聚体嵌段的聚氨酯力学性能更高；DSC曲线显示其有2个不同的玻璃化转变温度，相分离明显。

Prepolymers of Amino-terminal Non-isocyanate Block Copolymerized with Polyether-based Polyurethane

Modified polyether polyurethane and its film were prepared from prepolymer of amino-terminal non-isocyanate polyurethane and prepolymer of polyether-based polyurethane via block copolymerization.Synthesis condition of non-isocyanate prepolymer was analyzed;The impact of film-forming temperature and value of NCO and NH2 ratio on mechanical properties of membrane were investigated;Mechanical properties of different polyurethane materials were compared;Degree of phase separation was studied using differential scanning calorimetry(DSC).It showed that carbamate group was introduced into the amino-terminal non-isocyanate prepolymer;The best film-forming temperature was 140 ℃;When NCO/NH2 of prepolymer was 1/0.9,the best performance was obtained,tensile strength of 25.1 MPa,modulus of 100 % elongation of 5 MPa.Compared with regular polyurethane,polyurethane block with amino-terminal non-isocyanate polyurethane prepolymer had higher mechanical properties;DSC curves showed two different glass transition temperatures indicating phase separation.