Mechanical Behavior and Failure Mechanism of Phosphoric Acid Modified Para-Aramid Fiber

doi:10.11901/1005.3093.2016.549

Chinese Journal of Materials Research

2017, Vol. 31

Issue (8): 597-602 DOI: 10.11901/1005.3093.2016.549

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Mechanical Behavior and Failure Mechanism of Phosphoric Acid Modified Para-Aramid Fiber

Zhaoqing LU(

), Zhiping SU, Meiyun ZHANG, Yang HAO

College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, China, 710021

Cite this article:

Zhaoqing LU, Zhiping SU, Meiyun ZHANG, Yang HAO. Mechanical Behavior and Failure Mechanism of Phosphoric Acid Modified Para-Aramid Fiber. Chinese Journal of Materials Research, 2017, 31(8): 597-602.

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Abstract

Para-aramid fiber was modified with phosphoric acid (PA) and then was characterized by means of scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction(XRD). The mechanical behavior of the modified fiber (PPTA) was evaluated via measurement of the tensile strength and force-displacement curve of monofilament. The results show that the maximal fracture force of the modified fibers shifted to lower displacement region in force-displacement curves and the tensile strength of the monofilament decreased due to the damage of the skin region of PPTA fiber induced by PA-modification. Some aramid groups can be hydrolyzed during PA-modification process, thus decreasing the monofilament tensile strength of the modified PPTA fibers. In addition, the crystallinity of the modified fibers was improved because the original para-crystalline skin region was peeled off from the surface of PPTA fiber by PA-modification, hence resulting in the decrease of toughness of PA-modified fiber. The monofilament tensile strength of PPTA fiber decreased remarkably once it was modified with PA with concentration of higher than 40%(mass fraction), which can be attributed to the decrease of crystallinity.

Key words: organic polymer materials para-aramid fiber phosphoric acid modification mechanical behavior failure mechanism

Received: 20 September 2016

ZTFLH:

TQ342

Fund: Supported by Shaanxi Province As a Whole the Innovation Project of Science and Technology Plan Projects (No.2016KTCQ01-87), State Key Laboratory of Pulp and Paper Engineering (No.201333), and Key Laboratory Project Funded by Education Department of Shaanxi Provincial Government (No.12JS018)

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.549 OR https://www.cjmr.org/EN/Y2017/V31/I8/597

Fig.1 Load-displacement curves of PPTA fiber under tensile load

Fig.2 Effect of PA-modification on the monofilament tensile strength of PPTA fiber

Fig.3 Surface morphology of virgin and PA-modified PPTA fibers (a-0, b-10%, c-20%, d-30%, c-40% PA)

Fig.4 Schematic representation of a skin-core structure and fracture model of PPTA fiber

Fig.5 FT-IR spectra of virgin and PA-modified PPTA fibers (a-0, b-10%, c-20%, d-30%, e-40% PA)

Fig.6 Scheme of electrophilic substitution reaction(a) and hydrolysis reaction process(b) on PA-modified PPTA fibers surface

Fig.7 XRD patterns of virgin and PA-modified PPTA fibers

Table 1 Effect of PA-modification on the degree of crystallinity (CI) of PPTA fiber

Fig.8 Schematic representation of a deformation model of PPTA fiber

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