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A novolac epoxy resin modified polyurethane acylates polymer grafted network with enhanced thermal and mechanical properties

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Abstract

This paper describes the synthesis of novolac epoxy resin modified polyurethane acrylates (EPUAs) for generating a grafted polymer network, which is different from the conventional interpenetrating polymer networks (IPN). It starts with preparing epoxy acrylate resins (EA) by the ring-opening reaction of novolac epoxy resin (EP) and acrylic acid (AA). Epoxy acrylate copolymers (EPAcs) with hydroxyl groups were prepared by the copolymerization of EA and acrylic monomers. EPUAs were obtained by reacting EPAcs with curing agents (polyisocycanate HDI-trimer and phthalic anhydride). The chemical structures of the obtained EA and EPAcs were characterized by Fourier-transform infrared spectroscopy (FTIR) and 1H nuclear magnetic resonance spectra (1H NMR). The influence of EP on chemical and physical properties of EPUAs, including fracture surface morphology, thermal stability, tensile strength, elongation at break, glass transition temperature (Tg), cross-linking density, shore hardness, water absorption, adhesion, etc., were investigated as well. It is demonstrated that the incorporation of EP into EPUAs greatly enhances the above physico-chemical properties of EPUAs.

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Abbreviations

AA:

Acrylic acid

AIBN:

Azo-bis-isobutryonitrile

BA:

Butyl acrylate

DMF:

N,N-dimethylformamide

EA:

Epoxy acrylate resins

EP:

Novolac epoxy resin

EPAc:

Epoxy acrylate copolymers

EPUAs:

Novolac epoxy resin modified polyurethane acrylates

FTIR:

Fourier-transform infrared spectroscopy

GPC:

Gel permeation chromatography

HEMA:

2-hydroxyethyl methacrylate

H NMR:

1H nuclear magnetic resonance spectra

IPN:

Interpenetrating polymer networks

MWD:

Molecular weight distribution

PA:

Phthalic anhydride

PUAs:

Polyurethanes acylates

PS:

Polystyrene

SIN:

Simultaneous interpenetrating polymer networks

ST:

Styrene

TMAB:

Tetramethylammonium bromide

THF:

Tetrahydrofuran

Tg :

Glass transition temperature

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Acknowledgement

We are grateful for the financial support from the National Natural Science Funds of China (No. 21303026), Foundation for Distinguished Young Talents in Higher Education of Guangdong, China (NO:2013LYM0064), the Scientific Research Foundation of Guangzhou University (No. LJ08-2001), the Special Foundation for Young Scholars of Guangzhou University (No. LJ08-1001), and the Technology Project of Guangzhou (Grant No. 2013J4100023)

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, China

    Jing Lin, Xu Wu, Cheng Zheng, Qiaoyi Li & Wei Wang

  2. Worcester Polytechnic Institute, Worcester, MA, 01605, USA

    Peipei Zhang

  3. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China

    Zhuoru Yang

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  1. Jing Lin
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  2. Xu Wu
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  3. Cheng Zheng
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  4. Peipei Zhang
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  6. Wei Wang
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  7. Zhuoru Yang
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Correspondence to Jing Lin.

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Lin, J., Wu, X., Zheng, C. et al. A novolac epoxy resin modified polyurethane acylates polymer grafted network with enhanced thermal and mechanical properties. J Polym Res 21, 435 (2014). https://doi.org/10.1007/s10965-014-0435-2

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