ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
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.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
