含磷阻燃剂结构对阻燃共聚酯结构与性能的影响

摘要

Flame retardant copolyesters ( FR-PET) were synthesized by using three kinds of phosphorous flame retardant at the same content through copolycondensation .The effect of the phosphorous flame retardants structure on the polymerization reaction and the stability of copolyesters was studied .The structure of FR-PET was analyzed by nuclear magnetic resonance spectrometry and inductive coupling plasma emission spectrometry .The thermal property , flame retardance and hydrolytic retardance stability of FR-PET were characterized by differential scanning calorimetry , thermogravimetric analysis , limiting oxygen index and vertical flammability detection .The results showed that the three kinds of FR-PET exhibited the glass transition temperature , melting temperature, melting crystallization temperature and crystallinity lower than pure polyester due to the reactive phosphorous flame retardant structure;the introduction of the flame retardant structure could increase the thermal decomposition termperature and the residual carbon gield of FR-PET;a cold crystallization peak appeared as the FR-PET was modified with [(6-oxido-6H-dibenz[c, e][1,2]oxaphosphorin-6-yl)methyl]butanedioic acid, and the modified FR-PET had the excellent hydrolytic retardance stability and flame retardance stability .%采用共缩聚反应,合成了磷含量相同的3种含磷阻燃共聚酯(FR-PET),对比分析了3种含磷阻燃剂的结构对聚合工艺以及共聚酯稳定性的影响.采用核磁共振光谱仪、电感耦合等离子体发射光谱仪、对FR-PET的结构进行分析,采用差示扫描量热仪、热重分析仪、极限氧指数仪和垂直燃烧仪对FR-PET的热性能、阻燃性能以及耐水解稳定性进行了表征.结果表明:3种FR-PET由于反应型含磷阻燃结构的存在,导致其玻璃化转变温度、熔融温度、熔融结晶温度以及结晶度相对纯聚酯的低;阻燃结构的引入使FR-PET的热分解温度延后,且残炭率提高;[(6-氧代-6H-二苯并[c,e][1,2]氧磷杂己环-6-基)甲基]丁二酸改性的FR-PET出现冷结晶峰,且具有优异的耐水解稳定性,阻燃稳定性良好.