Polyisocyanuratoesters: Renewable Linear Polyesters with High Flame Retardancy

Flame retarded polyurethane vitrimers containing isocyanurate rings: Synthesis and properties

“…Inert gases released by decomposition of isocyanurate, which could take away the heat in the gas phase and dilute the oxygen concentrate, 17,23,62 thereby accelerating the extinguishment of combustion. These results are in line with previous studies in lecture, 23,24,26 in which isocyanurate-based materials showcase excellent flame retarded behavior. In addition, the CO production (COP, see Figure S2d) is as low as 0.53 mg/s.…”

“…The DCs used in this study are DC4, DC6 and DC10 (based on BDA, HDA and DDA, respectively) so that the products with a certain feed ratio of DC and THEIC (DC/THEIC = 3/2) are nominated as VPICU4-3/2, VPICU6-3/2, and VPICU10-3/2, respectively. The introduction of isocyanurate ring offers flame retardancy for VPICUs, 23,24,50 thus the content of isocyanurate moiety in the obtained VPICUs determines the flame retardancy. In addition, the degree of reactive functions (represented by free hydroxyl group in THEIC) has an influence on the reaction degree, the relaxation time and the retardancy.…”

“…18 Due to the certain reactivity of ICA, lots of derivatives bearing reactive functions can be obtained, 22 for instance, triglycidyl isocyanurate (TGIC), tri(2-hydroxyethyl) isocyanurate (THEIC), tri(2-carboxyethyl) isocyanurate (TCEIC), bis(2-carboxyethyl) isocyanurate (BCEIC), etc. In our previous study, 23,24 polyisocyanuratoesters (PICE) were prepared from BCEIC and diols, and epoxy resins (ER) were synthesized using TGIC and diacids. Both polymers possess inherently isocyanurate structure, which bring them excellent thermal stability and flame resistance.…”

“…Moreover, when comparing crosslinked and linear PICEs, the crosslinked ones are found to exhibit superior mechanical properties. 23,24 Although many different isocyanurate-based flameretarded polyurethanes (PUs) are available, [23][24][25][26] they are chemical crosslinked and non-reprocessable, which limits their further applications and reusability.…”

Transparent, Hydrolysable and Flame Retarded Bio-based Epoxy Resins via Catalyst-free Polymerization of Triglycidyl Isocyanurate and Aliphatic Diacids

“…However, there is some negative influence in this case, such as poor compatibility between ERs and flame retardant additives, migration of additives from ERs, etc. One of the solutions is to introduce flame retardant segments containing P [13][14][15], N [16][17][18][19], Si [4] or other flame retarded elements [5,20,21] into the backbones or side groups in bio-based ERs. Tailoring compounds with (poly)aromatic structure from biomass to the structure of epoxy building blocks can also improve the flame retardancy of ERs [11,16,22].…”