P(N-Phenylmaleimide-Alt-Styrene) Introduced with 4-Carboxyl and Its Effect on the Heat Deflection Temperature of Nylon 6.

Yufei Liu,Yang Li,Min He,Jie Yu,Shuhao Qin,Qian Zhao,Daohai Zhang

doi:10.3390/ma11112330

Abstract

P(N-phenylmaleimide-alt-styrene) (P(NPMI-alt-St)) and P(N-(4-carboxyphenyl)maleimide-alt-styrene) (P(CPMI-alt-St)) were designed and synthesized via free radical copolymerization. Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (1H NMR and 13C NMR), gel permeation chromatography (GPC), and differential scanning calorimetry (DSC) were used to confirm the structure of P(NPMI-alt-St) and P(CPMI-alt-St). Next, the effect of P(CPMI-alt-St) on the heat deflection temperature (HDT) of nylon 6 was studied. In comparison to the PA6/P(NPMI-alt-St) blend, with the addition of 10 wt %, the HDT value of the PA6/P(CPMI-alt-St) blend increased by 15.7 °C, and the glass transition temperature (Tg) by Dynamic mechanical analysis (DMA) increased 2.3 °C. According to the analysis of DMA, dynamic viscosity, and the SEM of PA6 and its blends, P(CPMI-alt-St) promoted its compatibility with PA6, and promoted the storage modulus and dynamic viscosity of the blends. Thus, the introduction of 4-carboxyl can significantly improve the effect of P(CPMI-alt-St) on the heat resistance modification of nylon 6.

Highlights

Since its discovery as a heat-resistant agent in 1981 by a Japanese catalyst chemical company, N-phenylmaleimide (NPMI) and its copolymers have been studied extensively [1,2,3,4] and used widely as a material in home appliances, automobiles, and the electronics industry [5,6,7]
Jianting Dong and his co-workers [11,12,13,14,15] synthesized an N-phenylmaleimide (NPMI)-styrene(St)-maleic anhydride (MAH) copolymer (NSM copolymer), and found that the Vicat softening point temperature of the acrylonitrile butadiene styrene (ABS)/NSM blend was significantly enhanced by increasing the Materials 2018, 11, 2330; doi:10.3390/ma11112330
Yuksel et al [18] found that the glass transition temperature and thermal stabilities of the liquid crystalline moiety containing N-cyclohexylmaleimide copolymers were increased by increasing the N-substituted maleimide (N-cyclohexylmaleimide) content

Summary

Introduction

Since its discovery as a heat-resistant agent in 1981 by a Japanese catalyst chemical company, N-phenylmaleimide (NPMI) and its copolymers have been studied extensively [1,2,3,4] and used widely as a material in home appliances, automobiles, and the electronics industry [5,6,7]. In order to improve the HDT, NPMI derivatives and their copolymers have attracted considerable interest with respect to applications in acrylonitrile butadiene styrene (ABS) [15] and poly(vinyl chloride) (PVC) [16,17]. Jianting Dong and his co-workers [11,12,13,14,15] synthesized an N-phenylmaleimide (NPMI)-styrene(St)-maleic anhydride (MAH) copolymer (NSM copolymer), and found that the Vicat softening point temperature of the ABS/NSM blend was significantly enhanced by increasing the Materials 2018, 11, 2330; doi:10.3390/ma11112330 www.mdpi.com/journal/materials. Yuksel et al [18] found that the glass transition temperature and thermal stabilities of the liquid crystalline moiety containing N-cyclohexylmaleimide copolymers were increased by increasing the N-substituted maleimide (N-cyclohexylmaleimide) content. The heat resistance modification of aliphatic series nylon via NPMI derivatives and their copolymers have not been reported to our knowledge

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Conclusion