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Poly(aspartic acid) Super‐Absorbent Resin Produced by Chemical Crosslinking and Physical Freeze/Thawing
Author(s) -
Zhao Ying,
Tan Tianwei
Publication year - 2006
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200600168
Subject(s) - swelling , ionic strength , crystallization , chemical engineering , microstructure , polymer chemistry , materials science , chemistry , composite material , organic chemistry , aqueous solution , engineering
Summary: Novel crosslinked poly(aspartic acid) super‐absorbent resins have been prepared using a chemical crosslinking agent and a freeze/thawing technique. This resin shows improved swelling behaviors as a result of the crystallization that serves as the physical crosslink. For further identification of microstructures and properties, SEM, DSC, X‐ray diffraction, and FT‐IR analyses have been used. To a certain extent, final structures and properties can be controlled by regulating the freeze/thawing conditions, including not only the number of freeze/thawing cycles, but also the temperature and time of both freezing and subsequent thawing. Its swelling behavior is significantly influenced by environmental conditions, such as ionic strength. Furthermore, the swelling ratio is also investigated in various physiological solutions.Swelling ratios of the novel PAsp super‐absorbers obtained with increasing number of freeze/thawing cycles.