依据聚脲化学反应原理，对胺扩链剂改性增加位阻解决了合成聚脲反应速率过快带来的问题，如动力学研究受到限制，对涂层性能产生的不利影响等,改善了聚脲弹性体的性能。对扩链剂N,N'-2-丙酸甲酯-1,6-己二胺，N,N'-2-甲基-丙酸甲酯-1,6-己二胺进行了烷基化改性,对扩链剂乙二胺、己二胺和间苯二胺进行了酰基化改性。对比得出位阻型酰胺扩链剂反应活性最小。并用红外光谱、高分辨质谱、氮含量测定和核磁共振氢谱分析对酰胺扩链剂结构进行了表征，确定了合成产物的化学结构。.将改性前后的扩链剂与端氨基聚醚和4,4'-二苯甲烷二异氰酸酯（MDI）通过溶液法合成了新型聚脲，考察扩链剂改性对聚脲性能的影响。用位阻型酰胺扩链剂合成聚脲时，凝胶时间延长，即反应活性降低；软段和硬段的相容性较好，且能显著提高聚脲的力学性能。.用傅里叶变换红外光谱跟踪了聚脲固化反应，研究了扩链反应动力学，给出了动力学关系，计算出了反应活化能。针对聚脲在使用过程中，对凝胶时间有不同要求的特点，改变扩链剂的种类和用量调整聚脲体系配方，建立了不同凝胶时间的扩链剂复配体系，实现了聚脲凝胶时间的预设控制；并考察了聚脲涂层的耐热与防腐性能。

Based on principles of polyureas reactions, the amine chain extenders were modified to reduce the reaction activity of synthesizing polyureas with isocyanate and to resolve problems caused by rapid reaction rate, such as unfavorable for the research of polyurea reaction kinetics, as well as the preparation of polyurea coating with excellent properties. N,N'-2-methyl 1,6-hexanediamine, N,N'-2-methyl-methyl acrylate 1,6-hexanediamine were alkylated and ethylenediamine, hexamethylene diamine, and m-phenylenediamine were acetylated. The relative reactivity of amide groups was the smallest by comparison. Chemical structures of modified diamine chain extenders were confirmed through FTIR, the determination of the nitrogen content, High resolution ESI-FTICR mass spectrometry and 1H-NMR analysis. .Polyureas were synthesized via two-step solution process by reaction of 4,4'-diphenyl diisocyanate(MDI), amine terminated polyether with different chain extenders. The influence of modified diamine chain extenders on properties of polyurea was investigated. The gel time was prolonged, or the reaction activity was decreased when the novel sterically hindered chain extender was used to synthesize polyureas. Their miscibility between the soft and hard segments was better and mechanical properties were greatly heightened..The reaction kinetics of polyureas curing process was monitored with FTIR and the extender chain reaction kinetics were studied. The reaction kinetics orders were determined, and their apparent activation energy was calculated. Due to the different interfaces need different gel time in spraying polyureas, in the end, mixture systems of chain extenders were established and the pre-set control of polyureas elastomer gel time was achieved by changing the type and amount of chain extenders and adjusting polyurea system formula. Heat-resistant and corrosion resistance of polyureas coatings were studied also.

依据聚脲化学反应原理，对胺扩链剂改性增加位阻解决了合成聚脲反应速率过快带来的问题，如动力学研究受到限制，对涂层性能产生的不利影响等,改善了聚脲弹性体的性能。对扩链剂N,N'-2-丙酸甲酯-1,6-己二胺，N,N'-2-甲基-丙酸甲酯-1,6-己二胺进行了烷基化改性,对扩链剂乙二胺、己二胺和间苯二胺进行了酰基化改性。对比得出位阻型酰胺扩链剂反应活性最小。并用红外光谱、高分辨质谱、氮含量测定和核磁共振氢谱分析对酰胺扩链剂结构进行了表征，确定了合成产物的化学结构。将改性前后的扩链剂与端氨基聚醚和4,4'-二苯甲烷二异氰酸酯（MDI）通过溶液法合成了新型聚脲，考察扩链剂改性对聚脲性能的影响。用位阻型酰胺扩链剂合成聚脲时，凝胶时间延长，即反应活性降低；软段和硬段的相容性较好，且能显著提高聚脲的力学性能。用傅里叶变换红外光谱跟踪了聚脲固化反应，研究了扩链反应动力学，给出了动力学关系，计算出了反应活化能。针对聚脲在使用过程中，对凝胶时间有不同要求的特点，改变扩链剂的种类和用量调整聚脲体系配方，建立了不同凝胶时间的扩链剂复配体系，实现了聚脲凝胶时间的预设控制；并考察了聚脲涂层的耐热与防腐性能。