摘要
通过模拟不同的熔融加工条件,对高黏阻燃共聚酯(flame retardant co-polyesters,FRPET)在熔融加工过程中的热解行为进行研究。测试FRPET样品的特性黏度和端羧基含量的变化,表征其热解程度差异,并采用傅里叶变换红外光谱(Fourier transform infrared spectroscopy,FTIR)与核磁共振(nuclear magnetic resonace,NMR)技术对其热解前后的结构进行表征,剖析热解机理。结果表明:相同条件下,FRPET比高黏聚酯(polyethylene terephthalate,PET)更易发生热解,且随温度升高,热解程度更加显著;在高温作用下,键能较低的次磷酸脂P—O键容易发生断裂,其中阻燃单体相邻的键结结构在苯环的强烈位阻效应下,更易发生断裂,引发降解。
The pyrolysis behavior of FRPET(flame retardant co-polyester) with high intrinsic viscosity during melt processing was studied by simulating melt processing experiments. The intrinsic viscosity and end carboxyl content of the samples were tested to characterize the degree of pyrolysis. The structure of the samples before and after pyrolysis was characterized by FTIR(Fourier transform infrared spectroscopy) and NMR(nuclear magnetic resonance), and the pyrolysis mechanism was analyzed. The results show that FRPET is more prone to pyrolysis than PET under the same conditions, and the degree of pyrolysis increases significantly with elevating temperature. Under high temperature, the P-O bond of hypophosphoric acid with low bond energy is prone to fracture. The bond of two adjacent flame retardant unit is easier to fracture due to the strong steric effect from benzene ring, leading to degradation.
作者
姬洪
宋明根
薛勇
亓书奎
陈康
张玥
张玉梅
JI Hong;SONG Minggen;XUE Yong;QI Shukui;CHEN Kang;ZHANG Yue;ZHANG Yumei(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University,Shanghai 201620,China;Zhejiang Unifull Industrial Fiber Co.Ltd.,Huzhou 313017,China)
出处
《东华大学学报（自然科学版）》
CAS
北大核心
2022年第1期12-16,共5页
Journal of Donghua University(Natural Science)
基金
国家重点研发计划项目(2016YFB0303004)
湖州市南太湖精英计划创新团队资助项目(2016HJYLB-03-B)。
关键词
阻燃
共聚酯
热解
分子量
flame retardant
co-polyester
pyrolysis
molecular weight
