热塑性聚氨酯硬段含量对CL-20钝感效果的影响研究

合成了以PET/PEPA为软段的不同硬段含量的热塑性聚氨酯弹性体(TPU),利用凝胶渗透色谱(GPC)、傅立叶变换红外(FTIR)对其进行了表征,并测试了其力学性能。通过水-溶液悬浮法将TPU包覆于六硝基六氮杂异伍兹烷(CL-20),对包覆后的CL-20进行了撞击感度、表面能和XPS测试。结果表明,不同硬段含量热塑性弹性体的包覆钝化效果不同,弹性体的力学性能与包覆效果(撞击感度、表面张力)具有一定关系。当硬段含量为50%时,TPU的强度和韧性适中,CL-20被其包覆后,撞击感度明显降低,特性落高达到46.2cm,XPS测试所得包覆度达到68.13%。

Influence of Thermoplastic Polyurethane Elastomers (TPU) with Different Fraction of Hard Segments on the Coating of CL-20

A series of thermoplastic polyurethane elastomers (TPU) with different fraction of hard segments based on poly(ethylene-propylene adipate) (PEPA)/ethylene oxide/tetrahydrofurancopolyether(PET)as soft segments were synthesized. The TPUs were characterized by GPC, FTIR and the tensile testing, and were used to coat the hexanitrohexaazaisowurtzitane (CL-20) by water suspension method. The coating effects were assessed by testing impact sensitivity , surface free energy and XPS .The results show that impact sensitivity of CL-20 coated with TPU is lowered and affected by fraction of hard segments of TPU. The coating effects of CL-20 is apparently related to the mechanical properties of TPU. The comprehensive properties of TPU with 50% hard segments content are optimum. The special height H50 of CL-20 coated by this kind of TPU is 46.2 cm, which increase 23.9 cm than that before coating. The coating degree achieved as 68.13%.