FTIR, 1H-NMR Spectra, and Thermal Characterization of Water-Based Polyurethane/Acrylic Hybrids

O.R. PARDINI; J.I. AMALVY

JOURNAL OF APPLIED POLYMER SCIENCE

Wiley

Año: 2008 vol. 107 p. 1207 - 1214

0021-8995

Polyurethane (PU) polymer was synthesized following a prepolymer mixing process, by polyadditionof isophorone diisocyanate (IPDI), poly(propylene glycol) (PPG), 2-hydroxyethyl methacrylate (HEMA), and2,2-bis(hydroxymethyl)propionic acid (DMPA). The PU anionomer having 2-ethoxymethacrylate terminal groupswas dispersed in water by prior neutralization of carboxylic acid groups of DMPA with triethylamine (TEA), chainextended with hydrazine (HZM) in water and a dispersion polymerization with methyl methacrylate/n-butyl acrylate/ acrylic acid mixture was performed. The above polymerization reactions lead to the formation of PU/acrylichybrids having a chemical bond between PU and acrylic moieties. Acrylic content was varied from 0 to 50 wt %and samples were purified to eliminate oligomers and impurities before characterization. The FTIR and 1H-NMRspectra of these purified hybrid samples were obtained and bands and peaks assignments were discussed. Thermalproperties (DSC and TGA) were also discussed. Breaking hydrogen bonds is the main reason for changes inproperties with increasing acrylic content. Particle size data of dispersions is also presented and discussed