Preparation and properties of waterborne interpenetrating polymer networks composed of polyurethaneurea and graft vinyl ester resin

Abstract

Various waterborne interpenetrating polymer networks (IPNs) composed of polyurethaneurea (PUU) and graft vinyl ester resin were prepared from polyester polyol, dimethylolpropionic acid, isophorone diisocyanate, ethylenediamine and a well-defined graft vinyl ester resin containing butanol side chains (BO-g-VER). These anionic IPN aqueous dispersions were stable at the ambient temperature for >1 yr, and also had the excellent stability at low and high temperatures. The experimental results showed that the introduction of BO-g-VER network has not only greatly affected the particle morphology, stability and rheological behavior of these aqueous dispersions, but also rendered the films with the augmented surface hydrophobicity as well as the excellent water-resistance performance and mechanical properties. A synergistic effect was observed at a certain BO-g-VER composition (20 wt %) to give significant reinforcement to the PUU, resulting from the compatibility and/or the interpenetration between the PUU network and the BO-g-VER network.

Macroporous Polymers with Aligned Microporous Walls from Pickering High Internal Phase Emulsions

“…Then MMA was added to the VEO obtained to prepare VER (VEO/MMA = 64/36, wt/wt). PUU/VER were synthesized and characterized according to reported work. − A stoichiometric amount of P756, DMPA, and IPDI ([NCO]/[OH] = 1.8, molar radio) were added into a 250 mL, four-necked flask equipped with a mechanical stirrer, a nitrogen inlet, and a thermometer. The mixture was reacted at 85 °C for 2 h under a dry nitrogen atmosphere until the theoretical NCO value was reached.…”

Facile hydrophobic modification of hybrid poly(urethane-urea)methacrylate aqueous dispersions and films through blending with novel waterborne fluorinated acrylic copolymers

“…The composition of poly(urethane-urea), with 4 wt.% DMPA and 34% hard segments deriving from the IPDI content, was chosen as to obtain an aqueous dispersion of small-sized particles (comparable to the PBF ones) and provide a latex film with optimized hydrophobic and mechanical properties. The simultaneous chain extension of the polyurethane precursor and free radical polymerization of MMA is likely to result in the formation of a semiinterpenetrated network (semi-IPN) due to PUU crosslinking by the diamine chain extender, depressing the crystallization of the soft segments and increasing the thermal stability and the glass transition [37]. The presence of PMMA in the hybrid PUUA was expected to enhance its compatibility with the acrylic PBF copolymer.…”