Polytriazole adhesives are a new type of adhesives with excellent heat resistance, but the lap shear strength at room temperature is not ideal, which is about 15 MPa. In order to improve its adhesion performance at room temperature, a series of urethane-modified polytriazole (UPTA) adhesives were successfully synthesized via 1, 3-dipolar cycloaddition reaction between azides, and alkynes. Firstly, an alkynyl-terminated urethane monomer di(but-3-yn-1-yl) (1,3-phenylenebis(methylene)) dicarbamate (DBPMD) was synthesized and characterized. Then DBPMD was reacted with biphenyl dibenzyl azide (BPDBA) and N′,N′,N′,N′-tetrapropargyl-p,p′-diaminodiphenyl methane (TPDDM) to prepare UPTA adhesives. Curing behavior, thermal properties, bonding performance, and resistance to damp heat aging of UPTA adhesives were studied. The results show that the introduction of urethane group has almost no effect on the curing behavior. The glass transition temperature (T_g) and the 5% thermal weight loss temperature (T_d5) gradually decreased with the increased proportion of DBPMD added. T_g of UPTA adhesives ranged from 185 to 215°C and T_d5 of UPTA adhesives were all above 300°C, which indicated its outstanding thermal stability. The lap shear strength at room temperature of UPTA adhesives increased first and then decreased with the increasing amount of DBPMD, which ranged from 13.9 to 19.9 MPa. The highest lap shear strength of UPTA adhesives can reach 19.9 MPa, which was 31.8% higher than PTA adhesive. The lap shear strength retention rate of UPTA adhesives at 180°C was all over 75%. Lap shear strength retention rate of UPTA adhesives under 168 h damp heat aging time was all over 80%. UPTA adhesives have good bonding performance, heat resistance, and damp heat aging resistance, which can meet many complex construction requirements.

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氨基甲酸酯改性聚三唑胶粘剂的制备及性能

聚三唑胶粘剂是一种具有优良耐热性的新型胶粘剂，但室温搭接剪切强度不理想，约为15 MPa。为了提高其在室温下的粘合性能，通过叠氮化物和炔烃之间的 1, 3-偶极环加成反应，成功合成了一系列氨基甲酸酯改性的聚三唑 (UPTA) 粘合剂。首先，合成并表征了炔基封端的氨基甲酸酯单体二(but-3-yn-1-yl)(1,3-亚苯基双(亚甲基))二氨基甲酸酯(DBPMD)。然后 DBPMD 与联苯二苄基叠氮化物 (BPDBA) 和N ', N ', N ', N'-四炔丙基-p,p'-二氨基二苯基甲烷（TPDDM）制备UPTA粘合剂。研究了UPTA胶粘剂的固化行为、热性能、粘合性能和耐湿热老化性能。结果表明，氨基甲酸酯基团的引入对固化行为几乎没有影响。随着DBPMD加入比例的增加，玻璃化转变温度（T _g）和5%热失重温度（T _d5）逐渐降低。UPTA 粘合剂的T _g范围为 185 至 215°C 和T _d5UPTA 胶粘剂的温度均在 300°C 以上，这表明其具有出色的热稳定性。UPTA胶粘剂的室温搭接剪切强度随着DBPMD用量的增加先增加后减小，范围为13.9～19.9 MPa。UPTA胶粘剂的最高搭接剪切强度可达19.9 MPa，比PTA胶粘剂高31.8%。UPTA胶粘剂180℃搭接剪切强度保持率均在75%以上。UPTA胶粘剂在168h湿热老化时间下搭接剪切强度保持率均在80%以上。UPTA胶粘剂具有良好的粘接性能、耐热性、耐湿热老化性，可满足许多复杂的施工要求。