TY  - EJOU
AU  - Chen, Zijian 
AU  - Tang, Rui Hou, Jianbing Cheng, Fengjie Fang, Donglin 
AU  - Zhang, Guangzhao 

TI  - Polyisocyanuratoesters: Renewable Linear Polyesters with High Flame Retardancy
T2  - Journal of Renewable Materials

PY  - 2018
VL  - 6
IS  - 6
SN  - 2164-6341

AB  - 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.
KW  - Urea
KW  -  isocyanurate ring
KW  -  aliphatic diol
KW  -  linear polyester
KW  -  flame retardancy

DO  - 10.32604/JRM.2018.00120