Experimental Study on Acid Resistance of PCT Fiber

doi:10.12068/j.issn.1005-3026.2023.06.014

Abstract

Abstract: To understand the effect of acid solution treatment on poly 1，4-cyclohexylen dimethylene terephthalate(PCT) fiber， the surface morphology， mechanical properties， aging reaction activation energy and infrared spectrum of PCT fibers before and after sulfuric acid and nitric acid treatment were tested and analyzed by scanning electron microscope(SEM)， single fiber strength machine， synchronous thermal analyzer(STA) and Fourier transform infrared spectrometer(FTIR). The results show that the acid immersion treatment can cause the shrinkage of PCT fiber， leading to the surface corrosion of the fibers and the occurrence of dents and cracks; The entering of water molecules into the fiber macromolecule gap of PCT fiber causes a simultaneous decrease in breaking strength and elongation at break; The breaking strength of PCT fiber decreased with the increase of acid solution concentration， treatment time and treatment temperature; Unless at a lower concentration and temperature， the sulfuric acid resistance of PCT fiber is better than that of nitric acid; The sulfuric acid resistance of PCT fiber is weaker than that of the polyphenylene sulfide(PPS) and the polytetrafluoroethylene(PTFE) fiber， and better than that of the polyimide(PI) and the Aramid 1313 fiber; Acid solution treatment can lead to a decrease in the activation energy of the aging reaction and molecular stability of PCT fiber.

Key words: PCT； acid resistance； mechanical properties； activation energy； infrared spectrum

CLC Number:

X932

CHANG De-qiang， CHEN Lei， MAO Ning， LIU Jing-xian. Experimental Study on Acid Resistance of PCT Fiber[J]. Journal of Northeastern University(Natural Science), 2023, 44(6): 863-870.

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