材料期刊网

采用缩二脲（HDI）封端端羟基丁腈橡胶预聚物,制备大分子橡胶改性活化剂,以氢氧化钠为催化剂,选择不同配比的ABS树脂加入熔融己内酰胺单体中,确定聚合温度为160℃~180℃,通过阴离子聚合制得ABS/尼龙6（PA6）共混物。在原位合成ABS改性尼龙体系中,以橡胶改性剂作为ABS与尼龙的相容剂,当ABS用量为m（ABS）/m（PA6）=10/100时可使改性尼龙基体冲击强度明显升高,效果优于橡胶改性体系;拉伸强度、弯曲强度随ABS加入而下降,低于纯尼龙的拉伸强度,但明显高于橡胶改性体系;相容剂用量的增加在一定程度上改善了基体强度、断裂伸长率。分析表明,ABS干扰了球晶的生长,使尼龙结晶度降低。

Macromolecule modification activator was prepared using prepolymer of hydroxyl terminated butadiene acrylonitrile copolymer（HTBN） end capped by hexamethylene diisocyanate（HDI） biuret（N-75）.Then the acrylonitrile butadiene styrene（ABS）/ nylon 6（PA6） co-blend polymer was prepared by anionic polymerization by putting ABS resin into molten caprolactam monomer at the temperature of 160 ℃～180 ℃ and the sodium hydroxide being used as activator.In the system of in-situ synthetic ABS modified nylon resin,when the content of ABS is m（ABS）/m（PA6）=10/100 with rubber modifier as the compatiblizing agent for ABS and nylon,the impact strength of matrices is stepped up obviously,and the effect is better than that in the system of rubber modification.Along with added ABS,the tensile strength and bending strength foll that are lower than the tensile strength of pure nylon but apparently higher than that of the rubber modification system.The increase usage of compatiblizing agent improves the intensity and rupture elongation of matrices.It is indicated that ABS obstructs spherulitic growth and results in the reduction of nylon crystallinity.