Preparation and Properties of Highly Hydrophobic Polyacrylonitrile Fiber

doi:10.19491/j.issn.1001-9278.2020.04.003

Abstract

Abstract:

Water?based phosphoric acid?modified epoxy resin (PAER) was prepared by using phosphoric acid and epoxy resin (E20) as raw materials, and its molecular structure was characterized by Fourier?transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The potassium salt of phosphoric acid?modified epoxy resin (PAERK) was obtained by a neutralization reaction of PAER with KOH, and then the fluorine?containing epoxy resin potassium salt (PAERKF) was prepared by using PAERK and fluorine?containing surfactant as raw materials. The results indicated that the optimum sizing concentration and coating amount for PAERKF was 0.6 wt % and 5.0 mg/g, respectively. After modification with PAERKF, the contact angle between the polyacrylonitrile (PAN) fiber and water reached 146.94°, indicating a highly hydrophobic feature. The PAERKF?modified PAN fiber achieved a dispersion coefficient of 0.89 in the epoxy matrix, and the dispersibility of fibers in the matrix was improved.

Key words: phosphoric acid, epoxy resin, water?based sizing agent, highly hydrophobic feature, polyacrylonitrile fiber

CLC Number:

TQ 342

Cun ZHOU, Chunlong ZUO. Preparation and Properties of Highly Hydrophobic Polyacrylonitrile Fiber[J]. China Plastics, 2020, 34(4): 12-19.

Figures/Tables 10

Fig.1. Reaction mechanism

Fig.2. Influence of reaction time, feed ratio and temperature on epoxy value and conversion rate

Fig.3. FTIR spectra of epoxy resin E20 and PAERK

Fig.4. 1H?NMR spectrum of epoxy resin E20 and PAERK

Fig.5. Effect of emulsion concentration on surface tension of PAEK emulsion and contact angle of PAN fiber

Fig.6. TG curves of epoxy resin E20 and PAERK

环氧值/ mol?（100g）^-1	转化率/%	平均粒径/μm	乳液外观	离心稳定性/ g
0.034	84.55	0.039	澄清透明	0
0.054	75.45	0.071	澄清发蓝光	0
0.063	71.36	0.094	澄清发蓝光	0.002
0.075	65.91	0.401	浑浊乳白色	0.066

Tab. 1. Effect of epoxy value on emulsion properties

Fig. 7. Effect of fluorine surfactant content on fiber contact angle

Fig.8. FE?SEM images of PAN fiber treated by PAERKF

Fig.9. Influence of adsorption amount of PAERKF on dispersion of PAN fiber

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