Isotactic polybutene-1(i PB)and polybutene-1/polypropylene in-reactor alloy(PBA)pipes were prepared by single screw pipe extruder.The crystallization and mechani-cal properties of i PB and PBA pipes were investigated by differential scanning calorimetry,small angle X-ray diffraction,heat creep,bursting,hydrostatic pressure and mechanical tests.The results showed that the lamellar thickness,melting temperature and crystalliza-tion temperature of i PB in PBA pipes were increased,the thermal creep,bursting pressure,hydrostatic pressure and mechanical properties were better than those of i PB pipe,which could be used as a new generation of high performance hot-water pipe.
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