Open Access

ARTICLE

Polyisocyanuratoesters: Renewable Linear Polyesters with High Flame Retardancy

Zijian Chen¹, Rui Hou, Jianbing Cheng, Fengjie Fang, Donglin Tang^*, Guangzhao Zhang

School of Materials Science and Engineering, South China University of Technology, 381 Wushan Road, Tianhe District, Guangzhou 510640, P. R. China

*Corresponding author:

Journal of Renewable Materials 2018, 6(6), 584-590. https://doi.org/10.32604/JRM.2018.00120

Abstract

Biobased urea nowadays attracts increasing attention as a biomass resource with giant potential, which benefits from the development of biobased ammonia and ecological sanitation system. Urea is an ideal feedstock for chemical industry and developing new urea-based pol ymer materials can take advantage of the urea resource. In this work, a class of renewable linear polyesters, nam ely polyisocyanuratoesters (PICEs) were synthesized from a urea-based monomer bis(2-carbomethoxyethyl) isocyanurate and biobased aliphatic diols. Compared with conventional aliphatic polyesters, PICEs containing isocyanurate rings in the polymer chain backbone exhibit outstanding flame retardancy that both PICE-4 (the number ‘4’ refers to the number of methylene in diols, e.g. 4 for butylene and 6 for hexylene) and PICE-6 have hig h limiting oxygen index values over 30%. In the UL 94 tests, PICE-6 reaches V-1 rating; while V-2 is found for PI CE-10. All PICEs exhibit similar pyrolysis behavior that the temperatures of 5% weight loss are around 320°C. PI CEs are found to have glass transition among 20°C-45°C. No crystallization behavior is observed without annealing except for PICE-10, which can crystallize even at room temperature.

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Keywords

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