以2,2,6,6-四丙酸环己酮为四官能团核心,进行己内酰胺的水解开环聚合,合成了四种不同臂长的四臂星型尼龙6,对产物的分子量进行了测定,并对其力学性能和流变行为进行了研究。结果表明,四臂星型尼龙6的分子量随着四丙酸环己酮含量的提高而降低,与相应分子量的线型尼龙6相比,星型尼龙6的拉伸强度和弯曲强度基本保持,冲击强度保持率在75%以上,断裂伸长率最大降低了15%,相对黏度降低了近25%,熔融指数提高了近4倍,平衡转矩降低了75%,表现出了较好的加工流动性。
Four kinds of star-shaped nylon 6 samples with different branched-chain length were prepared by the hydrolytic polymerization of ε-caprolactam using 2,2,6,6-tetra（β-carboxyethyl）cyclohexanone as tetrafunctional reactant.The molecular weight of prepared star-shaped nylon 6 was determined by end group titration, and mechanical properties and rheological behavior were also investigated.Compared with linear chain nylon 6 with similar molecular weight,the tensile and bending strength of star-shaped nylon 6 can be maintained,impact strength retention over 75%,elongation at break decreases by 15% maximally,relative viscosity reduces 25%,melting index increases nearly 4 times,balance torque reduces 75%.The prepared star-shaped nylon 6 presents good flow ability.
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