Synthesis and Flame Retardancy of Novel Thermally Stable Poly(imideurethane)s Containing Imide and Alkynyl Groups in Main Chain

doi:10.7503/cjcu20130586

Abstract

Abstract:

A kind of glycol containing imide and alkynyl function was synthesized from pyromellitic dianhydride(PMAD), butynediol(2-butyne-1,4-diol) and D,L-phenylalanine(DLP). Linear imide and alkynyl modified thermoplastic poly(imide-urethane)s were prepared by the obtained glycol, 4,4'-diphenylmethane diisocyanate(MDI) and poly(tetrahydrofuran)(PTMG) via prepolymerization. The poly(imide-urethane)s structures were characterized with Fourier transform infrared spectroscopy(FTIR), universal testing machine tension, thermalgravimetric analysis(TGA), wide-angle X-ray diffraction(XRD). The results showed that the novel thermoplastic poly(imide-urethane)s elastomer with amorphous structure were successfully synthesized. The tensile strength increases with the hard segment contents. Comparing with the conventional thermoplastic polyurethanes extended by 1,4-butanediol, the poly(imide-urethane)s show slower thermal degradation rate during the degradation process. The polymers with different hard segments contents all reach a UL-94 V-2 rating, and the limiting oxygen index(LOI) value increases with different hard segments contents.

Key words: Thermoplastic polyurethane, Imide, Alkynyl, Thermal stability, Flame retardancy

CLC Number:

O631.1

TrendMD:

TANG Qiheng, AI Qingsong, YANG Rongjie, HE Jiyu. Synthesis and Flame Retardancy of Novel Thermally Stable Poly(imideurethane)s Containing Imide and Alkynyl Groups in Main Chain[J]. Chem. J. Chinese Universities, 2014, 35(1): 199.

Figures/Tables 5

References 28

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Sample	m(MDI)∶m(PTMG)∶m(CE)^*	T_5%/℃	LOI(%)	Dripping	UL-94(3.2 mm)
TPU20	17.35∶80.00∶2.65	308.5	19.5	Yes, burns until clamping	No class
TPIU20	12.71∶80.00∶7.29	323.5	22.5	Yes, immediate extinguishing after removing the fiame	V-2
TPIU30	14.52∶70.00∶15.48	312.0	27.0	Yes, immediate extinguishing after removing the fiame	V-2
TPIU40	16.32∶60.00∶23.68	293.0	29.5	Yes, immediate extinguishing after removing the fiame	V-2

Sample	m(MDI)∶m(PTMG)∶m(CE)^*	T_5%/℃	LOI(%)	Dripping	UL-94(3.2 mm)
TPU20	17.35∶80.00∶2.65	308.5	19.5	Yes, burns until clamping	No class
TPIU20	12.71∶80.00∶7.29	323.5	22.5	Yes, immediate extinguishing after removing the fiame	V-2
TPIU30	14.52∶70.00∶15.48	312.0	27.0	Yes, immediate extinguishing after removing the fiame	V-2
TPIU40	16.32∶60.00∶23.68	293.0	29.5	Yes, immediate extinguishing after removing the fiame	V-2