PREPARATION AND PRPOPERTIES OF ENERGETIC THERMOPLASTIC ELASTOMERS FROM GAP AND POLY-BAMO

摘要

This work presents the preparation and analysis results of Energetic Thermoplastic Elastomers (ETPEs), which have been prepared from commercial available GAP and Poly-BAMO via chain elongation with difunctional isocyanates and chain extenders. The aim of this work was to evaluate the influence of different chain extenders and a variation of the diisocyante on the melting temperature of ETPEs. Chain extenders that have been evaluated were 1,4-Butanediol (BDO), N,N'-Dimethyl urea (DMU) and Hydrochinone (HC). 2,4-Toluene diisocyanate (TDI) and 1,4-Phenylene diisocyanate (PHDI) have been used as diisocyanates. Twelve compositions have been prepared and analysed by DSC and viscometer. The variations on chain extenders with BDO, DMU and HC did not show any significantly improvement in melting temperature. All ETPEs with high Glycidylazide polymer (GAP) content of 65 % and chain extenders showed decreasing viscosity and softening before the melting temperature. The ETPEs with GAP contents of less than 50 % did not show this softening behaviour. When oligomeric Poly-BAMO-urethanes have been used for chain elongation two samples have shown higher melting points of 86 and 87 °C at DSC and only slightly decrease of the viscosity and softening before the melting temperature even with high GAP content of 65 %. PHDI did not show any significantly influence on the melting point.