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Issue 107, 2015
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Synthesis and properties of star-branched nylon 6 with hexafunctional cyclotriphosphazene core

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Abstract

A novel star-branched nylon 6 with hexafunctional cyclotriphosphazene core was synthesized using hexa(4-carboxylphenoxy)cyclotriphosphazene (HCPCP) with six carboxyl groups as multifunctional agent in the hydrolytic ring-opening polymerization of ε-caprolactam, and then used for the investigation of mechanical properties, crystallization and rheology behaviors. Star-branching structure and molecular weight have great effects on its properties. Compared with linear nylon 6, star-branched nylon 6 has lower relative viscosity and higher melt flow rate while its mechanical properties can be almost retained by the use of star-branching and an appropriate molecular weight. Research on crystallization behavior indicates that the degree of crystallinity (Xc) of star-branched nylon 6 decreases slightly, but its crystal structure still belongs to α form. The peak crystallization temperature (Tc) and crystallization rate (1/t1/2) of star-branched nylon 6 are significantly higher than that of linear nylon 6 because of heterogeneous nucleation induced by HCPCP core, which is beneficial for the use of rapid molding process. As the molecular weight increases, the Tc and 1/t1/2 of star-branched nylon 6 first increase and then decrease. Capillary rheometer measurement exhibits that the shear viscosity of star-branched nylon 6 decreases with decreasing molecular weight, and the shear viscosity of star-branched nylon 6 with an appropriate molecular weight shows a low value and little or no sensitivity to shear rate and temperature. Such rheology behavior allows for processing at low temperature and low pressure and reduces system cost.

Graphical abstract: Synthesis and properties of star-branched nylon 6 with hexafunctional cyclotriphosphazene core

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Supplementary files

Article information


Submitted
04 Aug 2015
Accepted
09 Oct 2015
First published
12 Oct 2015

RSC Adv., 2015,5, 88382-88391
Article type
Paper
Author version available

Synthesis and properties of star-branched nylon 6 with hexafunctional cyclotriphosphazene core

C. Wang, F. Hu, K. Yang, T. Hu, W. Wang, R. Deng, Q. Jiang and H. Zhang, RSC Adv., 2015, 5, 88382
DOI: 10.1039/C5RA15598C

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