In this work, we modified nylon 6 with liquid rubber by in-situ polymerization. The infrared analysis suggested that HDI urea diketone is successfully blocked by caprolactam after grafting on hydroxyl of HTPB, and the rubber-modified nylon copolymer is generated by the anionic polymerization. The impact section analysis indicated the rubber-modified nylon 6 resin exhibited an alpha crystal form.With an increase in the rubber content, nylon 6 was more likely to generate stable α crystal. Avrami equation was a good description of the non-isothermal crystallization kinetics of nylon-6 and rubber-modified nylon-6 resin. Moreover, it is found that the initial crystallization temperature of nylon-6 chain segment decreased due to the flexible rubber chain segment. n value of rubber-modified nylon-6 indicated that its growth was the coexistence of two-dimensional discoid and three-dimensional spherulite growth. Finally, the addition of the rubber accelerated the crystallization rate of nylon 6.

中文翻译：

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阴离子原位聚合制备橡胶改性尼龙6的形貌和结晶动力学

在这项工作中，我们通过原位聚合用液态橡胶对尼龙6进行了改性。红外分析表明，HDI脲二酮接枝到HTPB的羟基上后，己内酰胺能成功地将其封堵，而阴离子改性的橡胶改性尼龙共聚物。冲击截面分析表明，橡胶改性的尼龙6树脂表现为α晶型，随着橡胶含量的增加，尼龙6更有可能产生稳定的α水晶。Avrami方程很好地描述了尼龙6和橡胶改性的尼龙6树脂的非等温结晶动力学。此外，发现尼龙-6链段的初始结晶温度由于柔性橡胶链段而降低。橡胶改性尼龙6的n值表明，其生长是二维盘状和三维球晶生长的并存。最后，橡胶的添加加速了尼龙6的结晶速度。