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Effect of cyclophosphazene nucleated hyperbranched polyester on flame retardancy and mechanical properties of epoxy resins
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-03-22 , DOI: 10.1002/app.52404
Hailong Yu 1 , Li Tian 1 , Yingxue Zhu 1 , Anjun Zhu 1 , Xin Mao 1 , Baoping Yang 1 , Junhong Guo 1 , Bo Mu 1 , Jinfeng Cui 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-03-22 , DOI: 10.1002/app.52404
Hailong Yu 1 , Li Tian 1 , Yingxue Zhu 1 , Anjun Zhu 1 , Xin Mao 1 , Baoping Yang 1 , Junhong Guo 1 , Bo Mu 1 , Jinfeng Cui 1
Affiliation
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Hexakis(4-hydroxyphenoxy) cyclotriphosphazene (PN-OH) was synthesized by a nucleophilic substitution and aldehyde reduction reaction of hexachlorocyclotriphosphazene with p-hydroxybenzaldehyde, and then cyclophosphazene nucleated hyperbranched polyesters (HBP) were prepared via a one-pot esterification reaction of PN-OH and dimethylolpropionic acid. The chemical structure and molecular weight distribution of HBP were confirmed by 1H-NMR, FTIR, and GPC. The HBP was applied to epoxy resin (EP) to improve its mechanical properties and flame retardancy. The cone calorimeter test revealed that the maximum heat release rate, total heat release and total smoke release of HBP/EP composites were reduced by 35.9%, 21.6%, and 27.3%, respectively, when 7 wt% HBP was added to the EP matrix compared with pure EP. Meanwhile, when 7 wt% HBP was added to EP composites, the limiting oxygen index value was increased from 24.6% to 27.7% and the UL-94 test reached a V-1 rating. More importantly, the thermal stability and mechanical properties of the HBP/EP composites were enhanced. The flame retardant mechanism analysis showed that HBP primarily acted as a flame retardant in the condensed phase. These results indicate that the HBP/EP composites have exceptional overall performance and a broad range of applications in critical fields.
中文翻译：
环磷腈成核超支化聚酯对环氧树脂阻燃性能和力学性能的影响
通过六氯环三磷腈与对羟基苯甲醛的亲核取代和醛还原反应合成六(4-羟基苯氧基)环三磷腈(PN-OH)，然后通过PN-的一锅酯化反应制备环磷腈成核超支化聚酯(HBP)。 OH 和二羟甲基丙酸。HBP的化学结构和分子量分布由1H-NMR、FTIR 和 GPC。将 HBP 应用于环氧树脂 (EP) 以提高其机械性能和阻燃性。锥形量热仪测试表明，当在 EP 基体中添加 7 wt% HBP 时，HBP/EP 复合材料的最大放热率、总放热和总发烟量分别降低了 35.9%、21.6% 和 27.3%。与纯EP相比。同时，当 7 wt% HBP 添加到 EP 复合材料中时，极限氧指数值从 24.6% 增加到 27.7%，UL-94 测试达到 V-1 等级。更重要的是，增强了 HBP/EP 复合材料的热稳定性和机械性能。阻燃机理分析表明，HBP在凝聚相中主要起阻燃作用。
更新日期：2022-03-22
中文翻译：
环磷腈成核超支化聚酯对环氧树脂阻燃性能和力学性能的影响
通过六氯环三磷腈与对羟基苯甲醛的亲核取代和醛还原反应合成六(4-羟基苯氧基)环三磷腈(PN-OH)，然后通过PN-的一锅酯化反应制备环磷腈成核超支化聚酯(HBP)。 OH 和二羟甲基丙酸。HBP的化学结构和分子量分布由1H-NMR、FTIR 和 GPC。将 HBP 应用于环氧树脂 (EP) 以提高其机械性能和阻燃性。锥形量热仪测试表明，当在 EP 基体中添加 7 wt% HBP 时，HBP/EP 复合材料的最大放热率、总放热和总发烟量分别降低了 35.9%、21.6% 和 27.3%。与纯EP相比。同时，当 7 wt% HBP 添加到 EP 复合材料中时，极限氧指数值从 24.6% 增加到 27.7%，UL-94 测试达到 V-1 等级。更重要的是，增强了 HBP/EP 复合材料的热稳定性和机械性能。阻燃机理分析表明，HBP在凝聚相中主要起阻燃作用。
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