通过反相气相色谱法（IGC）,采用非极性和极性探针分子研究了新型热塑性聚氨酯弹性体（DTPU）的色散表面自由能和表面Lewis酸碱性质,并与传统的推进剂用热塑性聚氨酯粘合剂（BTPU）做了对比。结果表明,DTPU与BTPU的色散表面自由能较为接近,并且随着温度的升高而线性降低;DTPU的酸常数Ka和碱常数Kb分别为0.09和0.48,而BTPU的酸常数Ka和碱常数Kb分别为0.06和0.37,DTPU的酸性和表面总的酸碱作用能力较大,与推进剂中高能固体填料具有更好的相互作用。
Inverse gas chromatography（IGC） was employed to investigate the dispersive component of the surface free energy and the surface acid-base properties of the thermoplastic polyurethane elastomer（DTPU）,surface properties of which were then compared with those of the traditional thermoplastic polyurethane elastomer（BTPU） that can be used as the propellant binder.It is found that the dispersive component of the surface free energy of DTPU is close to that of BTPU and the dispersive component of the surface free energy decreases linearly with increasing temperature.The Lewis acidic number Ka and the basic number Kb of DTPU are 0.09 and 0.48 respectively.The surface Lewis base number and total acid-basic ability of DTPU are higher than those of BTPU,whose Lewis acidic number is 0.06 and basic number is 0.37.Therefore,DTPU has better interactions with high-energy solid fillings.
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