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Structure‐property relationships of core‐shell type waterborne polyacrylate‐polyurethane microemulsions
Author(s) -
Dong Anjie,
Feng Shiyou,
Sun Duoxian
Publication year - 1998
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/(sici)1521-3935(19981201)199:12<2635::aid-macp2635>3.0.co;2-c
Subject(s) - polyurethane , copolymer , acrylate , materials science , shell (structure) , microemulsion , polymer chemistry , phase (matter) , core (optical fiber) , monomer , butyl acrylate , composite material , chemical engineering , polymer , chemistry , organic chemistry , pulmonary surfactant , engineering
Different cross‐linking types of core‐shell types waterborne polyacrylate‐polyurethane (PAC‐PU) microemulsions, in which polyurethane acts as the shell of the latex particles and a copolymer of acrylate monomers as the core, were synthesized. In the anionic polyurethane film. there is a certain degree of softhard phase mixing and different extents of short‐range order of the hard segments. The introduction of a polyacrylate core increases the soft‐hard phase separation in the polyurethane and breaks the short‐range order of the hard segments in polyurethane to some extent. The hard segments in the shell and the core cause a widened tan δ peak. This peak shifts to higher frequencies as the core‐shell ratio increases and also when a Type A or Type B cross‐linking structures exist. The cross‐linking structure, especially Type B, improves the soft‐hard separation and the phase mixing of the core and the hard segments in the shell and at the same time breaks the short‐range order in the hard segments. The cross‐linking structure does not affect the thermogravimetric properties of the PAC‐PU films.