Effects of molecular weight on properties of PA1012 and its composites
Three kinds of long chain AABB-type even-even nylon nylon 1012(PA1012)with different molecular weight and molecular weight distribution were used as raw materials.The influences of molecular weight and molecular weight distribution on the structure and performance of pure PA1012 and PA1012/glass fiber(GF)composite materials were studied.The basic physical properties,thermodynamic properties,and crystallization behavior of different molecular weight and molecular weight distribution PA1012 were characterized and analyzed.The results show that high molecular weight and wide molecular weight distribution PA1012 have higher toughness,smaller thermal deformation,and larger molding shrinkage.The mechanical properties and heat resistance of PA1012/GF composite materials are significantly improved compared to pure PA1012,while the water absorption rate and shrinkage rate are significantly reduced.High molecular weight and wide molecular weight distribution reduce the crystalliza-tion ability of PA1012/GF composite materials,which is beneficial to the improvement of composite material toughness,while causing a decrease in rigidity and heat resistance,an increase in the longitudinal/lateral shrinkage rate difference.In practical appli-cations,PA1012 with low molecular weight/narrow molecular weight distribution can be selected in case higher rigidity matetial is required;PA1012 with high molecular weight/wide molecular weight distribution can be preferential in case high toughness is required.
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