| Synthesis of Castable HTPB Polyurethane and Its Properties |
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| DOI： |
| Key Words: castable polyurethane elastomer；hydroxy-terminated polybutadiene；chain extender；mechanical property |
| Author Name | Affiliation | | Hao Lixin | Qingdao Institute of Chemical Technology | | Zhu Shaoqing | Qingdao Institute of Chemical Technology | | Zhang Hong | Qingdao Institute of Chemical Technology | | Su Guichen | Qingdao Institute of Chemical Technology | | Li Dehe | Qingdao Institute of Chemical Technology |
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| Abstract: |
| A prepolymer was prepared using hydroxy-terminated polybutadienes (HTPB) with different molecular weight and 2，4-toluene diisocyanate.A castable polyurethane was prepared with the said prepolymer and N，N-bis（2-hydroxypropyl）aniline chain extender.The influence of the free isocyanate content in the prepolymer，the extender level，the molecular weight of HTPB，the blend of HTPB with different molecular weight and the blend of various chain extenders on the mechanical properties of the resultant elastomer were investigated.The structure and morphology of the elastomer were preliminary analysed and discussed.The results showed that the maximum tensile strength and the optimum comprehensive properties were obtained when the free isocyanate content in the prepolymer was 9.0%；the maximum tensile strength，modulus and hardness were obtained when the chain extension coefficient was 0.89；the mechanical properties of the elastomer decreased as the molecular weight of HTPB increased.It was showed by TEM that there were micro-phase seperation and irregular distribution of soft and hard blocks in HTPB polyurethane. |
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