PVA Microcrystalline Cross-linking and SA/PAA Double Network Synergistic Modification of SA Fiber †

doi:10.7503/cjcu20190473

Abstract

Abstract:

In order to improve the breaking strength and elongation at break of sodium alginate(SA) fiber, acrylic acid(AA) was used as chemical crosslinking component, SA was used as ion crosslinking component, and polyvinyl alcohol(PVA) was used as microcrystalline crosslinking group. The sodium alginate/polyacrylic acid/polyvinyl alcohol(SA/PAA/PVA) composite fiber containing PVA microcrystalline cross-linking point and SA/PAA double network structure was prepared by wet spinning and freeze-thaw cycle method. The effects of cross-linking agent N,N-methylenebisacrylamide(MBA) content and PVA microcrystalline cross-linking on the structure and properties of SA/PAA/PVA spinning dope and composite fiber were studied by rheological properties, mechanical properties, infrared spectroscopy, X-ray diffractometer(XRD) and sweeping electron microscope(SEM) tests. The results showed that when the MBA content is 0.5%, the loss modulus(G″) of the spinning dope is the smallest and the spinnability is the best. The breaking strength of the composite fiber reached 2.83 cN/dtex, and the elongation at break reached 9.38%, which was 15.98% and 38.96% higher than that of the regenerated SA fiber. PVA formed a microcrystalline cross-linking point after freezing and PAA and PVA had been compounded into the system. The crystallinity of composite fibers increased after joining PAA and PVA. The surface morphology of the composite fiber tends to be smooth and regular, and the fiber cross section is more dense.

Key words: Sodium alginate, SA/PAA double network, Microcrystalline cross-linking, Polyvinyl alcohol

CLC Number:

O636

TrendMD:

YAN Ming,ZHOU Weidong,ZHANG Hong,SHI Junfeng,ZHAO Yunhe,YE Yongming,GUO Jing,YU Yue. PVA Microcrystalline Cross-linking and SA/PAA Double Network Synergistic Modification of SA Fiber ^†[J]. Chem. J. Chinese Universities, 2020, 41(2): 349.

Figures/Tables 12

Scheme 1 Preparation of flow chart

Fig.1 Characterization of rheological properties of SA/PAA/PVA blend solution a—g. Loss modulus; a'—g' storage modulus. a, a'. Regenerated SA; b, b'. SA/PAA/PVA, not frozen; c, c'. SA/PAA/PVA, already frozen; d, d'. SA/PAA/PVA, 0.25%MBA; e, e'. SA/PAA/PVA, 0.5%MBA; f, f'. SA/PAA/PVA, 0.75%MBA; g, g'. SA/PAA/PVA, 1%MBA.

Scheme 2 Schematic diagram of SA/PAA composite fiber dual network structure

Fig.2 Breaking strength(a) and breaking elongation(b) of SA/PAA/PVA composite fibers at different MBA contents

Scheme 3 Roles of dynamic victim keys

Fig.3 Mechanical properties of regenerated SA fiber and SA/PAA/PVA composite fibers treated under different conditions a. Regenerated SA; b. not frozen, SA/PAA/PVA; c. 0.25% MB and already frozen, SA/PAA/PVA; d. 0.5% MBA and already frozen, SA/PAA/PVA.

Fig.4 Infrared spectra of regenerated SA fiber(a) and SA/PAA/PVA composite fiber(b)

Fig.5 Fitted IR curves of regenerated SA fiber(A) and SA/PAA/PVA composite fiber(B) (A) a—f. Fitted curves 1—6; g. originaL curve. (B) a—e. Fitted curves 1—5; f. original curve.

Sapmle	Type of hydrogen bond	Structural formula	$ν ˙$ /cm^-1	Peak area	Relative Strength(%)
Regenerated SA fiber	Free hydroxyl	—OH	3599	1.55	3.5
	Intramolecular hydrogen bond	OH…OH	3442	18.33	54.2
		Four association	3097	5.99
	Intermolecular hydrogen bond	OH…O(in ether)	3266	12.10	42.3
		OH…π	3543	6.25
		OH…N	3126	0.68
SA/PAA/PVAComposite fiber	Free hydroxyl	—OH	3582	5.21	8.9
	Intramolecular hydrogen bond	OH…OH	3403	14.85	37.1
		Four association	3165	6.95
	Intermolecular hydrogen bond	OH…O(in ether)	3287	12.80	54.0
		OH…π	3492	18.90

Sapmle	Type of hydrogen bond	Structural formula	$ν ˙$ /cm^-1	Peak area	Relative Strength(%)
Regenerated SA fiber	Free hydroxyl	—OH	3599	1.55	3.5
	Intramolecular hydrogen bond	OH…OH	3442	18.33	54.2
		Four association	3097	5.99
	Intermolecular hydrogen bond	OH…O(in ether)	3266	12.10	42.3
		OH…π	3543	6.25
		OH…N	3126	0.68
SA/PAA/PVAComposite fiber	Free hydroxyl	—OH	3582	5.21	8.9
	Intramolecular hydrogen bond	OH…OH	3403	14.85	37.1
		Four association	3165	6.95
	Intermolecular hydrogen bond	OH…O(in ether)	3287	12.80	54.0
		OH…π	3492	18.90

Fig.6 XRD patterns of regenerated SA fiber(a) and SA/PAA/PVA composite fiber(b)

Fig.7 TG(A) and DTG(B) curves of regenerated SA fiber(a) and SA/PAA/PVA composite fiber(b)

Fig.8 SEM images of surface(A, B) and cross-sectional(C, D) of regenerated SA fiber(A, C) and SA/PAA/PVA composite fiber(B, D)

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