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Testing and characterization of high-temperature degradation performance of para-aramid fibres.

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Titel: Testing and characterization of high-temperature degradation performance of para-aramid fibres.
Alternate Title: Testarea şi caracterizarea performanței de degradare la temperatură înaltă a fibrelor para-aramidice.
Autoren: CHUNYAN ZHU1 tree_0206@hotmail.com, YANPING LIN1 42579825@qq.com, XIANGAI ZHANG2 782131548@qq.com, CHEN YANG1,3 comradeyang@qq.com
Quelle: Industria Textila. 2024 Special Issue, Vol. 75, p102-110. 9p.
Schlagwörter: Intrinsic viscosity, Materials testing, Chemical kinetics, Molecular structure, Infrared spectroscopy
Abstract (English): Para-aramid fibres possess excellent properties, including high modulus, high strength, and high-temperature resistance, making them highly practical and cost-effective reinforcement materials. To further analyse the usage performance of para-aramid fibres under extreme conditions and explore their degradation behaviour and mechanisms at high temperatures, this paper investigates para-aramid fibres through high-temperature annealing. Various tests, including thermogravimetric analysis, infrared spectroscopy, X-ray diffraction, Ubbelohde viscometry, and universal material testing, were employed to analyse changes in the thermal degradation temperature, molecular structure, and mechanical properties of para-aramid fibres. Tests have shown that after high-temperature treatment of para-aramid fibres, different protruding particles and pits appear on the surface of the fibres, and the molecular structure gradually undergoes cleavage and cross-linking. This results in varying degrees of increase in the crystallinity, intrinsic viscosity, and apparent grain size of crystal planes in different directions of the para-aramid fibres with rising temperatures. On the other hand, the degree of orientation, the rate of the second type of lattice distortion, thermal performance, and mechanical properties show a declining trend. The thermal degradation conforms to the kinetics of a second-order reaction. [ABSTRACT FROM AUTHOR]
Abstract (Romanian): Fibrele para-aramidice posedă proprietăți excelente, inclusiv modul înalt, rezistență ridicată si rezistență la temperatură ridicată, făcându-le materiale de armare extrem de practice si rentabile. Pentru a analiza în continuare performanța de utilizare a fibrelor para-aramidice în condiții extreme si pentru a explora comportamentul si mecanismele de degradare ale acestora la temperaturi ridicate, această lucrare investighează fibrele para-aramidice prin tratament la temperatură înaltă. Diverse teste, inclusiv analiza termogravimetrică, spectroscopie în infrarosu, difracția de raze X, vâscozimetria Ubbelohde si testarea universală a materialelor, au fost utilizate pentru a analiza modificările temperaturii de degradare termică, structurii moleculare si proprietăților mecanice ale fibrelor para-aramidice. Testele au arătat că, după tratamentul la temperatură înaltă a fibrelor para-aramidice, pe suprafața fibrelor apar diferite particule proeminente si orificii, iar structura moleculară suferă treptat scindare si reticulare. Acest lucru are ca rezultat grade diferite de creştere a cristalinității, a vâscozității intrinseci si a mărimii aparente a granulelor planurilor cristalografice în diferite direcții ale fibrelor para-aramidice odată cu cresterea temperaturii. Pe de altă parte, gradul de orientare, rata celui de-al doilea tip de distorsiune a rețelei, performanța termică si proprietățile mecanice arată o tendință de scădere. Degradarea termică se conformează cineticii unei reacții de ordinul doi. [ABSTRACT FROM AUTHOR]
Datenbank: Supplemental Index
Beschreibung
Abstract:Para-aramid fibres possess excellent properties, including high modulus, high strength, and high-temperature resistance, making them highly practical and cost-effective reinforcement materials. To further analyse the usage performance of para-aramid fibres under extreme conditions and explore their degradation behaviour and mechanisms at high temperatures, this paper investigates para-aramid fibres through high-temperature annealing. Various tests, including thermogravimetric analysis, infrared spectroscopy, X-ray diffraction, Ubbelohde viscometry, and universal material testing, were employed to analyse changes in the thermal degradation temperature, molecular structure, and mechanical properties of para-aramid fibres. Tests have shown that after high-temperature treatment of para-aramid fibres, different protruding particles and pits appear on the surface of the fibres, and the molecular structure gradually undergoes cleavage and cross-linking. This results in varying degrees of increase in the crystallinity, intrinsic viscosity, and apparent grain size of crystal planes in different directions of the para-aramid fibres with rising temperatures. On the other hand, the degree of orientation, the rate of the second type of lattice distortion, thermal performance, and mechanical properties show a declining trend. The thermal degradation conforms to the kinetics of a second-order reaction. [ABSTRACT FROM AUTHOR]
ISSN:12225347
DOI:10.35530/IT.075.01.2023115