Open Access

ARTICLE

Polyisocyanuratoesters: Renewable Linear Polyesters with High Flame Retardancy

by Zijian Chen, 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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