Abstract
Interpenetrating polymer networks (IPN) coating were synthesized from castor oil-based polyurethane (PU), methyl acrylate (MA), and coated onto the surface of regenerated cellulose (RC) film to obtain biodegradable water-resistant films. The tensile strength (σb), water resistance (R), water vapor permeability (P) percent light transmittance (T) and biodegradation rate of the coated films cured at 80°C for 5 minutes changed with the content of methyl acrylate in the coating. The introduction of methyl acrylate can enhance the water resistance, but reduce the biodegradation rate of the films. The most excellent values such as σb, 444 kg cm−2 in wet state, R, 0.59, P, 3.2 × 10−2 mg cm−2 day−1 were obtained at 30 wt% methyl acrylate in the coating. The interfacial bonding of the coated film was investigated with infrared spectroscopy (IR), ultraviolet spectroscopy (UV), transmission electron microscopy (TEM), electron probe microanalysis (EPMA), and differential thermal analysis (DTA). The results showed that the coated films exist strong interfacial bonding caused by covalent and hydrogen bonds between the RC film and the coating. Furthermore, while there was formation of IPN in the coating, the PU prepolymer in the coating penetrated into the RC film and crosslinked with the cellulose formed another semi-IPN.
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