作者：Bourbigot, Serge, Xavier Flambard, et Franck Poutch

发表：Polymer Degradation and Stability 74, no 2 (2001): 283 290. doi:10.1016/S0141-3910(01)00159-8

 

 

This work investigates the thermal degradation of high performance fibres. Poly-p-phenylenediamine-terephthalamide fibres (PPTA) and poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibres are examined when degrading in a furnace. Both gas and condensed phase are analysed. When degrading PPTA and PBO, CO, CO2 and H2O are detected by FTIR as major compounds composing the gas phase. As minor products, aromatic species, hydrocyanic acid (HCN) and ethylenic species are found (600 °C). Because of the higher thermal stability of PBO, their evolved amounts are always lower than those of PPTA and they are given off at much longer times. Moreover, no aromatic compound and a very low quantity of ethylenic species are detected in the gas phase suggesting they were involved in charring reactions. At 800 °C only nitric oxides are detected as minor products in the gas phase. A mechanism of formation of NOx from HCN is proposed. The investigation of the condensed phase by solid state NMR shows that PPTA and PBO are transformed into char when degrading. The char is composed of partially oxidised polyaromatic compounds, which can trap free radicals. It is suggested that the char structure of PBO may resist oxidation better than PPTA.

 

 

Poly-p-phenylenediamine-terephthalamide;

Poly(p-phenylene-2,6-benzobisoxazole);

Zylon纤维;

Kevlar;

Thermal degradation 热降解;

Charring 碳化;

Gas phase 气相;

Solid state NMR 固态核磁共振
 

 

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