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Morphological core/shell structure and dispersion stability of water‐dispersible copolyester graft polymerized with acrylic acid and ethyl acrylate
Author(s) -
Um Sung Il,
Ko Sohk Won
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960606)60:10<1587::aid-app10>3.0.co;2-2
Subject(s) - copolyester , polymer chemistry , materials science , ethylene glycol , condensation polymer , polymerization , chemical engineering , polymer , chemistry , organic chemistry , polyester , composite material , engineering
Abstract Anionic water‐dispersible copolyester was prepared by the polycondensation of dimethyl isophathalate (DMI)/5‐sodium sulfo dimethyl isophathalate (DMS) with ethylene glycol (EG)/ diethylene glycol (DEG) to synthesize water‐dispersible copolyester ‐g ‐AA/EAs by chemical method. In the case of graft polymerization of AA/EA onto DMI/DMS/EG/DEG copolyester does not. This is a result of the core/shell structure that was ascertained by the graft yield and the zeta potential of copolyester ‐g ‐AA/EAs. It appears that grafted AA/EA exists at the surface of copolyester ‐g ‐AA/EA particles, and the backbone polymer, i.e., DMI/DMS/EG/DEG copolyester, exists in the inner phase of the copolyester, ‐g ‐AA/EA particles. The complete solubility of copolyester ‐g ‐AA/EAs in 1N NaOH aqueous solution seems to come mainly from the electrostatic repulsion between COOs that are present at the surface of copolyester ‐g ‐AA/EA particles due to AA grafting and OHs that are present at the dispersion medium due to NaOH decomposition and which cause the hydrolytic breakage and consequently the coagulation of copolyesters in alkaline medium. © 1996 John Wiley & Sons, Inc.