Studies on Microstructure of Radiation-Synthesized PAM, PNaA and P(AM-NaA) Copolymer Hydrogels by Scanning Electron Microscope

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (9): 1467.

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Studies on Microstructure of Radiation-Synthesized PAM, PNaA and P(AM-NaA) Copolymer Hydrogels by Scanning Electron Microscope

SHAN Jun¹, LIU Zhan-Jun²

1. Department of Chemical Engineering, Hefei University of Technology, Hefei, 230009;
2. Department of Applied Chemistry, University of Science & Technology of China, Hefei, 230026

Received:1994-11-23 Revised:1995-03-31 Online:1995-09-24 Published:1995-09-24

Abstract

Abstract: The polymer hydrogels polyacrylamide (PAM),poly sodium acrylate (PNaA) and P(AM-NaA) in different AM/NaA monomer unit ratios with lower crosslinking densities were synthesized by ⁶⁰Co-γ ray radiation polymerization in aqueous solutions.The microstructure of these dry hydrogel samples in which water was extracted by acetone was observed by scanning electron microscope, The results indicate that different ratios of AM/NaA in these homopolymer and copolymer hydrogels have much influence on their microstructure. It is attributed to the relative strength of two kinds of opposite forces──hydrogen bond attraction and electrostatic repulsion which exist in chain segments of polymers. However,the relative strength depends on different ratios AM/NaA,and finally affects the ways of polymer chain packing. As a result, there are obvious differences in microstructure between homopolymers and copolymers.

Key words: Radiation polymerization, Hydrogel, Acrylic amide (PAM), Sodium acrylate (PNaA), P(AM-NaA) copolymer

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SHAN Jun, LIU Zhan-Jun. Studies on Microstructure of Radiation-Synthesized PAM, PNaA and P(AM-NaA) Copolymer Hydrogels by Scanning Electron Microscope[J]. Chem. J. Chinese Universities, 1995, 16(9): 1467.

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Studies on Microstructure of Radiation-Synthesized PAM, PNaA and P(AM-NaA) Copolymer Hydrogels by Scanning Electron Microscope

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