Two kinds of nylon 6 elastomer,J7013 with Shore hardness of 70 D and 6510 with Shore hardness of 65 D,were selected for melt blending with nylon 12,then the alloy materials of PA12 modified by PA6 elastomer were prepared,the influences of the contents of these two types of nylon 6 elastomers on the mechanical properties and heat resistance of nylon 12 were studied,and the compatibility between nylon 6 elastomers and nylon 12 was investigated by differential scanning calorimetry.It is found that with the increase of the mass fraction of nylon 6 elastomer from 0%to 60%,the tensile breaking strength and elongation at break of the material increase.While the mass fraction of nylon 6 elastomer exceeds 60%,the tensile breaking strength and elongation at break tend to values of each nylon 6 elastomer.The flexural strength and modulus of the material decrease as the content of nylon 6 elastomer increases,while which remain almost invariable when the mass fraction of J7013 is not higher than 20%.The toughness of nylon 12 is increased by nylon 6 elastomer significantly,6510 has a better toughening effect than J7013 when the mass fraction of nylon 6 elastomer is less than 40%,but when the mass fraction of nylon 6 elastomer reaches or exceeds 40%,the toughening effect of J7013 is better,which can increase the notched impact strength of the material to over 80 kJ/m2.Nylon 6 elastomer also improves the heat resistance of nylon 12,when the mass fraction of nylon 6 elastomer exceeds 50%,J7013 has a better effect on improving heat resistance than 6510.Although nylon 6 elastomer has a good filling and toughening effect on nylon 12 in terms of performanc-es,the two are incompatible at the molecular level.
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