Five types of perpolymers with various ——NCO content from 6.0％ to 8.0％ were respectively synthesized through two-step method using polycaprolactone (PCL-2000) and 4,4-diphenylmethane diisocyanate (MDI).And a series of cast polyurethane elastomers (CPUE) were prepared using 1,4-butanediol (BDO) as chain extender.The effects of——NCO content and crosslink coefficient on the properties of the CPUE were analysized by testing mechanical properties,XRD,TGA and vicat softening point.Results showed that,with the increase of——NCO content,hardness,tensile strength and tear strength of the CPUE increased,but impact elasticity and elongation at break decreased.The CPUE got the best mechanical properties when crosslink coefficient was 0.95.The crystalline ability of CPUE decreased with the increase of ——NCO content.Thermal stability analysis showed that CPUE had a good thermal stsbility,and its initial decomposition temperature was 320 ℃.The vicat softening point of CPUE increased with the increase of ——NCO content.When ——NCO content of prepolymer was 8.0％,vicat softening point reached 164.2 ℃.
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NSTL
万方数据
维普
