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Effect of polyurethane molecular weight on the properties of polyurethane–poly(butyl methacrylate) hybrid latex prepared by miniemulsion polymerization
Author(s) -
Tian Cun,
Zhou Qing,
Cao Li,
Su Zhiqiang,
Chen Xiaog
Publication year - 2011
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/app.34149
Subject(s) - miniemulsion , polyurethane , materials science , prepolymer , miscibility , polymer chemistry , emulsion polymerization , methacrylate , polymerization , differential scanning calorimetry , coating , chemical engineering , composite material , polymer , physics , engineering , thermodynamics
Polyurethane (PU) prepolymer was first prepared via introducing double bonds on‐to the PU chains, and then polyurethane–poly (butyl methacrylate) (PU–PBMA) hybrid latex was prepared via miniemulsion polymerization. Transmission electron microscopy, Differential scanning calorimeter (DSC), Fourier transform infrared, and dynamic mechanical analysis were adopted to characterize the hybrid latex and its coating film. Both the coating property and the miscibility of PU–PBMA emulsion have been greatly improved through introducing double bonds into PU prepolymer. With an increase in the molecule weight of PU ( M PU ), the increase in the particle size of PU–PBMA emulsion was observed plus decreases in the stability of the hybrid latex and conversion of methacrylate. Besides, as M PU increased, the final dried coating film of the hybrid latex showed decreased water resistance, weakened miscibility, and improved mechanical properties. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011