Hydroxy-terminated oligomers with narrow molecular weight distribution using as soft segment of polyurethane can significantly increase the modulus, tensile strength, and elongation at break of the polyurethane. Thus, design and synthesis of new hydroxy-terminated oligomers having narrow molecular weight distribution can improve the properties of polyurethane and further expand the use range of polyurethane. A set of side-chain hydroxyl-terminated polybutadiene (HTPB) derivatives were successfully synthesized by anionic polymerization and blue light photocatalytic thiol-ene reaction. Firstly, HTPB with narrow molecular weight distribution was synthesized via anionic polymerization using mono-lithium based initiator and followed by de-protection. Then, HTPB derivatives with different side-chains such as butyl, ethyl acetate, or myristyl, namely HTPB_but, HTPB _eac and HTPB_tet, were obtained by blue light photocatalytic thiol-ene reaction using Ru(bpy)₃Cl₂ as photoredox catalyst and HTPB as matrix polymer. Similar with HTPB, those HTPB derivatives also have narrow molecular weight distribution. Polyurethane elastomers (PUs) were synthesized with HTPB or HTPB derivatives as soft segment, toluene diisocynate (TDI) as hard segment, and 1, 4-butanediol as chain extender. Compared study the performances of polymers, the results showed that glass transition temperature (T_g) and viscosity of HTPB derivatives were increased when short-chain side groups were introduced. But instead, T_g and viscosity of HTPB derivatives was reduced following long-chain side groups being grafted. Through comparing research of properties for PUs, tensile strength is reduced and elongation at break is augmented, when side groups were introduced in HTPB backbone. Research on the contact angle tests of PUs indicated that the contact angle of PUs using HTPB, HTPB_but or HTPB_eac as soft segment, is similar, and PUs using HTPB_tet as soft segment has a larger contact angle about 137.2 °C.

具有窄分子量分布的端羟基低聚物作为聚氨酯的软链段可以显着提高聚氨酯的模量、拉伸强度和断裂伸长率。因此，设计合成具有窄分子量分布的新型端羟基低聚物可以改善聚氨酯的性能，进一步扩大聚氨酯的使用范围。通过阴离子聚合和蓝光光催化硫醇-烯反应，成功合成了一组侧链羟基封端的聚丁二烯（HTPB）衍生物。首先，使用单锂基引发剂通过阴离子聚合合成窄分子量分布的HTPB，然后去保护。然后，具有不同侧链的HTPB衍生物，如丁基、乙酸乙酯或肉豆蔻基，即HTPB_但是，HTPB _eac和HTPB _tet是通过蓝光光催化硫醇-烯反应获得的，使用Ru(bpy) ₃ Cl ₂作为光氧化还原催化剂和HTPB 作为基质聚合物。与HTPB类似，这些HTPB衍生物也具有窄的分子量分布。聚氨酯弹性体 (PU) 以 HTPB 或 HTPB 衍生物为软链段，甲苯二异氰酸酯 (TDI) 为硬链段，1, 4-丁二醇为扩链剂合成。对聚合物的性能进行了比较研究，结果表明，当引入短链侧基时，HTPB衍生物的玻璃化转变温度（T _g）和粘度增加。但相反，T _g长链侧基接枝后，HTPB衍生物的粘度降低。通过对聚氨酯性能的比较研究，在 HTPB 主链中引入侧基后，拉伸强度降低，断裂伸长率增加。对聚氨酯接触角测试的研究表明，使用HTPB、HTPB _but或HTPB _eac作为软_链段的PU 的接触角相似，使用HTPB _tet作为软_链段的PU 的接触角更大，约为137.2 °C。