Surface property of thermoplastic polyurethane elastomer by contact angle
Zhang Wenyu1,2, Zhu Hongli3, Luo Yunjun4, Ren Liping1
1.Standardization Research Institute of China North Industries Group Corporation,Beijing 100089; 2.School of Materials Science and Engineering,Tsinghua,Beijing 100084; 3.53th Research Institute of China North Industries Group Corporation,Jinan 250031; 4.School of Material Science and Engineering,Beijing Institute of Technology,Beijing 100081
Abstract: Contact angle method was employed to investigate the surface properties of thermoplastic polyurethane elastomers(BTPU) and modified thermoplastic polyurethane elastomers(DTPU),both of which were used as binders for propellants.And the interactions of two kinds of thermoplastic polyurethane elastomers with high-energy ammonium nitrate hexogen (RDX) in propellants were further evaluated and compared.Results showed that the surface free energy of DTPU(40.55mJ/m2) was higher than BTPU(34.59mJ/m2),the interface adhesion energy between DTPU and RDX was 81.83mJ/m2 and the interface adhesion energy between BTPU and RDX was 72.30mJ/m2.That was to say that the adhesion energy between DTPU and RDX in solid propellants was better than that between BTPU and RDX.Thus DTPU was more suitable to be used as solid propellant binders than BTPU.
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