Synthesis of reactive DOPO-based flame retardant and its application in polyurethane elastomers

被引:39
作者
Wang, Hao [1 ]
Liu, Qiang [1 ]
Zhao, Xin [1 ]
Jin, Zhao [1 ]
机构
[1] Qingdao Univ Sci & Technol, Key Lab Rubber Plast, Minist Educ, Shandong Prov Key Lab Rubber Plast, Qingdao 266042, Peoples R China
关键词
Polyurethane elastomers; Phosphorus-containing polyester diol; Reactive flame retardants; Tensile strength; WATERBORNE POLYURETHANE; THERMAL-DEGRADATION; PHOSPHORUS-NITROGEN; COPOLYESTERS; POLYISOBUTYLENE; POLYPHOSPHATE; CALORIMETER; PERFORMANCE; COPOLYMERS; RESISTANCE;
D O I
10.1016/j.polymdegradstab.2020.109440
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
An inherently flame-retardant polyester diol (FRPE) containing phosphorus was successfully synthesized via condensation polymerization with the commercial reactive flame retardant 9,10-dihydro-10-[2,3-di(hydroxycarbonyl)propyl]-10-phospha-phenanthrene-10-oxide (DDP), adipic acid (AA), ethylene glycol (EG), and 1,4-butanediol (1,4-BDO). Flame-retardant polyurethane elastomers (FR-PUEs) were subsequently produced by employing FRPE, 4,4-diphenylmethane diisocyanate (MDI) and 1,4-BDO. The mechanical and thermal properties and flame retardancy of the resulting FR-PUEs were characterized by tensile tests, thermogravimetric analysis (TGA), differential scanning calorimetric (DSC) analysis, dynamic mechanical analysis (DMA), limiting oxygen index (LOI) analysis, vertical burning tests (UL-94), and cone calorimeter (CC) analysis. It was suggested that DDP would increase the interaction between the hard and soft segments, resulting in FR-PUEs of unexpected higher tensile strengths of up to 40.0 MPa. In addition, it was found that the introduction of DDP can give rise to an increase of the residual char yield and limiting oxygen index (LOI), whereas reduces the total heat release (THR). Especially, using a low phosphorus content of 0.72 wt.%, the vertical burning level and LOI of the resultant FR-PUE reached V-0 and 24% respectively, and reduced THR of 52.6 MJ/m(2) was obtained. The flame-retardant mechanism of phosphorus in DDP was proposed both in the gas and condensed phases based on cone calorimeter (CC), residual char analyses and TG-IR analysis. (C) 2020 Elsevier Ltd. All rights reserved.
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页数:11
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