Preparation and Properties of Halogen-free Fire Retardant Acrylonitrile Copolymer

doi:10.7503/cjcu20130458

Abstract

Abstract:

Acrylonitrile(AN)-vinyl acetate(VAc) copolymer [P(AN-co-VAc)] was synthesized via aqueous phase precipitated radical copolymerization of AN and VAc using K₂S₂O₈-NaHSO₃ as initiator. The VAc unit of P(AN-co-VAc) was selectively hydrolyzed with KOH aqueous under different pH values. The halogen-free fire retardant AN copolymer was prepared by the phosphorylation reaction among phosphoric acid, urea and the hydrolyzed P(AN-co-VAc). The structure of AN copolymer was characterized by nuclear magnetic resonance hydrogen spectrum(¹H NMR), Fourier transform infrared spectroscope(FTIR), and the thermal property of them was studied by differential scanning calorimetry(DSC) and thermogravimetric analysis(TGA). The number-average molecular weight(M_n) and polydisperisity index(PDI) of the obtained P(AN-co-VAc) were determined by gel permeation chromatography(GPC). The char residue of the halogen-free fire retardant AN copolymer was analyzed by FTIR and SEM. The results show that AN is really copolymerized with VAc and P(AN-co-VAc) can be synthesized successfully. VAc unit is quickly hydrolyzed with the increase of pH. DSC indicates that with the increase of mass fraction of VAc in P(AN-co-VAc), the temperature of cyclic exothermic peak(T_p) improves, and T_p reaches to 328 ℃ with the mass fraction of VAc being 25%, while T_p of fire retardant AN copolymer can be 340 ℃. TGA demonstrates that the char residue of fire retardant AN copolymer at 800 ℃ is 55%, which is higher than that of P(AN-co-VAc) being 41%, it fully proves that fire retardant AN copolymer has good char forming capability. The fire retardant mechanism of fire retardant AN copolymer belongs to condensed phase flame retardant mechanism.

Key words: Acrylonitrile, Vinyl acetate, Aqueous phase precipitated radical polymerization, Halogen-free flame retardant, Thermal property

CLC Number:

O631.3

TrendMD:

REN Yuan-Lin, XIN Peng-Yue, SU Qian, CHENG Bo-Wen. Preparation and Properties of Halogen-free Fire Retardant Acrylonitrile Copolymer[J]. Chem. J. Chinese Universities, 2013, 34(9): 2216.

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