Synthesis of hyperbranched polymers and its effect on sanitary properties of PA6 microfiber/PU composite materials

摘要

A series of hyperbranched poly(amine-ester) polyol were synthesized by the polycondensation of N, N-diethylol-3-amine-methylpropionate (prepared by the Michael addition reaction of methyl acrylate with diethanolamine) as an AB2-type monomer and trimethylol propane as the core moiety using p-toluenesulfonic acid as a catalyst in a one-step melt reaction procedure. The obtained monomer and polymers were characterized by FTIR and 1H-NMR spectroscopy. It was suggested that the hyperbranched poly (amine-ester) polyol was formed via a mechanism of a combination of transesterification and addition reactions. The solubility and surface activity in aqueous solution of the polymers were also examined. PA6 microfiber/PU composite materials were treated by hyperbranched polymer, and then the gas permeability, water vapor permeability and moisture absorption were studied. When the dosage of dye was 5% and the dosage of hyperbranched polymer was 10%, PA6 microfiber/PU composite materials’ water vapor permeability and moisture absorption were 0.5254 mg/10cm2·24h and 0.0467 mg/10cm2·24h, respectively, which was increased by 15% and 35% compared to the untreated materials, but the dosage of hyperbranched polymer had little influence on gas permeability of synthetic leather. SEM results showed that PA6 microfiber/PU composite materials treated by hyperbranched polymer were incompact.