可生物降解吸水树脂.pdf

Int J Plast Technol (June 2012) 16(1):50–66 DOI 10.1007/s12588-012-9026-4 RESE ARCH ART I CLE Fully biodegradable potato starch composites: effect of macro and nano fiber reinforcement on mechanical, thermal and water-sorption characteristics S. Arun K. A. Ajith Kumar M. S. Sreekala Received: 24 August 2011 /Accepted: 29 May 2012 / Published online: 1 August 2012 # Central Institute of Plastics Engineering Technology 2012 Abstract Nature provides an impressive array of polymers which are generally biode- gradable, as biodegradation is part of the natural biogeochemical cycle. Natural poly- mers, such as starch and cellulose have the potential to replace many current polymers if new material composites can be prepared to rival the performance of exisitng compo- sites. While the conventional composites offer excllent mechanical properties and durability, most commercial polymers are derived from petroleum feed stock. Even though the utilization of petroleum-based composites are non-biodegradable and envi- ronmentally undesirable. Environment-friendly “Green” composites, based on potato starch and reinforced with nanocellulose/ramie fabric were prepared by hot compression moulding technique. PCL was coated to reduce water sensitivity. In the absence of reinforcing fillers, residual thermal stress transfer is affected. For reinforced composites, mechanical properties were seen to increase as a result of reinforcement. In composites containing the hydrophilic nanofibres and the hydrophobic PCL, phase inhomogeneity causes lower mechanical properties. Elongation at break increased for multiphase composites due to low interfacial adhesion. The uniform web-like network of nanofibres decreases water sorption. However, the presence of hydrophilic lignocellulosics increases water sorption. The PCL- containing composites show a low water sensitivity as expected. The nanostructure of the composites