Synthesis and Properties of PAAS/PVA/Zn0.2Fe2.8O4 Magnetic Composite Hydrogels

doi:10.19491/j.issn.1001-9278.2021.04.003

Abstract

Abstract:

The citric acid-coated zinc-doped nano?ferroferric oxide（Zn_0.2Fe_2.8O₄，ZFO）nanoparticles with good dispersibility in water were prepared by a chemical coprecipitation method and then characterized by X-ray diffractometer， transmission electron microscope and comprehensive physical property tester. The results indicated that the nanoparticles presented a relatively uniform distribution with a particle size of 3~8 nm as well as saturation magnetization up to 60 emu/g. A new type of PVA/PAAS/ZFO interpenetrating network hydrogels were prepared through the initiates polymerization of sodium acrylate by crosslinking in the aqueous phase， followed by freezing and thawing cross-linking. It was found that the introduction of nano-ZFO particles increased the tensile strength of the hydrogels by about 1.5 times and also improved their thermal stability. Moreover， the addition of nano-ZFO particles accelerated the electrical response rate and strength of hydrogels.

Key words: sodium polyacrylate, polyvinyl alcohol, zinc-doped nano-ferroferric oxide, electrical response

CLC Number:

TQ 325.9

WU Shouang, TU Zheng, LIU Beijun, GONG Xinghou. Synthesis and Properties of PAAS/PVA/Zn_0.2Fe_2.8O₄ Magnetic Composite Hydrogels[J]. China Plastics, 2021, 35(4): 12-17.

Figures/Tables 5

Fig.1. Analysis of the morphology and magnetic properties of nanoparticles

Fig.2. TEM image of PAAS/PVA/ZFO composite hydrogel containing 3 %ZFO particles

Fig.3. TG curves of PAAS/PVA and PAAS/PVA/Zn0.2Fe2.8O4 composite hydrogel

ZFO含量/%	拉伸强度/kPa	断裂伸长率/%
0.0	112±38	178±21
0.5	166±33	168±23
1.0	220±30	185±25
3.0	279±40	143±32
5.0	211±45	132±30

Tab. 1. Tensile strength and elongation at break of the compo?site hydrogels with different ZFO contents

Fig.4. Electrical response behavior of hydrogels with different ZFO contents

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Synthesis and Properties of PAAS/PVA/Zn_0.2Fe_2.8O₄ Magnetic Composite Hydrogels

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References 17

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