Bulk plastic materials obtained from processing raw powders of renewable natural polymers via back pressure equal channel angular consolidation (BP-ECAC)

Abstract Renewable natural polymers wheat starch (WS) and wheat gluten (WG) were successfully processed into plastic bulk materials using back pressure equal channel angular consolidation (BP-ECAC) without using any additional plasticizers at relatively low temperatures. The strong shear deformation occurred during the process caused an effective deformation of WS or WG granular structures and resulted in an efficient gelatinization of starch or plasticization of gluten with the natural moisture content. Sufficient chain entanglement was formed in both WS and WG materials for achieving strong cohesion among the macromolecule matrixes. The mechanical strength of the obtained plastic materials was comparable to that of conventional polymers but stronger than the strength of thermoplastic WS or plasticized WG. The processing temperature played an important role in determination of morphologies and properties of the plastic materials. Increasing processing temperature would cause more effective gelatinization or plasticization of the natural polymers, enhance the interactions among different components in the systems, and form materials with improved mechanical properties. Thermal cross-linking might play a positive role in the improvement of mechanical properties when processing temperature was increased. However, thermal decomposition could also occur under such severe shearing especially at high temperatures. The optimum temperature for conducting such process was around 100–120 °C for WS and WG. The BP-ECAC method provides a potential to manufacture natural polymer based plastic materials efficiently on an industrial scale for various applications.

[1]  Xiaoqing Zhang,et al.  The mechanical property and phase structures of wheat proteins/polyvinyl alcohol blends studied by high-resolution solid-state NMR , 2004 .

[2]  Xiaoqing Zhang,et al.  pH effect on the mechanical performance and phase mobility of thermally processed wheat gluten-based natural polymer materials. , 2006, Biomacromolecules.

[3]  R. Furneaux,et al.  Solid-state NMR studies on the structure of starch granules , 1995 .

[4]  Hung-Jue Sue,et al.  Simple shear plastic deformation behavior of polycarbonate plate due to the equal channel angular extrusion process. I: Finite element methods modeling , 1999 .

[5]  J. L. Willett,et al.  Properties of starch‐graft‐poly(glycidyl methacrylate)–PHBV composites , 1998 .

[6]  N. Gontard,et al.  New plasticizers for wheat gluten films , 2001 .

[7]  P. J. Lillford,et al.  Glass transitions and the fracture behaviour of gluten and starches within the glassy state , 1995 .

[8]  S. Guilbert,et al.  Extrusion of wheat gluten plasticized with glycerol: Influence of process conditions on flow behavior, rheological properties, and molecular size distribution , 1999 .

[9]  Xiaoqing Zhang,et al.  The phase composition and molecular motions of plasticized wheat gluten-based biodegradable polymer materials studied by solid-state NMR spectroscopy , 2006 .

[10]  G. Moates,et al.  Phase and glass transition behaviour of concentrated barley starch-glycerol-water mixtures, a model for thermoplastic starch , 1997 .

[11]  S. Hulleman,et al.  Crystallinity in starch bioplastics , 1996 .

[12]  D. H. Ramkumar,et al.  Effect of crystallinity on the mechanical properties of starch/synthetic polymer blends , 1997 .

[13]  Intermolecular interactions and phase structures of plasticized wheat proteins materials. , 2005, Biomacromolecules.

[14]  R. Smith.  Biodegradable polymers for industrial applications , 2005 .

[15]  Aristippos Gennadios,et al.  Effect of pH on properties of wheat gluten and soy protein isolate films , 1993 .

[16]  Richard P. Wool,et al.  Bio-based polymers and composites , 2005 .

[17]  Hung-Jue Sue,et al.  Mechanical behavior of polymethylmethacrylate with molecules oriented via simple shear , 2005 .

[18]  S. Guilbert,et al.  Thermal properties of raw and processed wheat gluten in relation with protein aggregation , 2001 .

[19]  H. Sue,et al.  Control of Orientation of Lamellar Structure in Linear Low Density Polyethylene Via a Novel Equal Channel Angular Extrusion Process , 1998 .

[20]  S. Guilbert,et al.  Rheological properties of gluten plasticized with glycerol: dependence on temperature, glycerol content and mixing conditions , 1999 .

[21]  L. Avérous,et al.  In-line determination of plasticized wheat starch viscoelastic behavior: impact of processing , 2003 .

[22]  Xiaoqing Zhang,et al.  Thermal decomposition chemistry of starch studied by 13C high-resolution solid-state NMR spectroscopy , 2002 .

[23]  Hung-Jue Sue,et al.  Impact fracture behavior of molecularly orientated polycarbonate sheets , 2001 .

[24]  S. Guilbert,et al.  Study of wheat gluten plasticization with fatty acids , 2003 .

[25]  E. Thomas,et al.  Biodegradable Polymers and Packaging , 1993 .

[26]  L. Avérous.  Biodegradable Multiphase Systems Based on Plasticized Starch: A Review , 2004 .

[27]  K. Xia,et al.  Back pressure equal channel angular consolidation of pure Al particles , 2005 .

[28]  C. Forte,et al.  13C and 1H solid state NMR investigation of hydration effects on gluten dynamics. , 2003, International journal of biological macromolecules.

[29]  S. Ringer,et al.  Ultrafine pure aluminium through back pressure equal channel angular consolidation (BP-ECAC) of particles , 2007 .

[30]  S. Hulleman,et al.  The role of water during plasticization of native starches , 1998 .

[31]  P. Zhu,et al.  Simple shear deformation of polypropylene via the equal channel angular extrusion process , 2006 .

[32]  Hung-Jue Sue,et al.  Morphological characterization of nylon-6 nanocomposite following a large-scale simple shear process , 2005 .

[33]  Hung-Jue Sue,et al.  Morphological Evolution of Poly(ethylene terephthalate) during Equal Channel Angular Extrusion Process , 2000 .

[34]  Z. Xia,et al.  Dynamic mechanical behavior of oriented semicrystalline polyethylene terephthalate , 2001 .

[35]  Z. Xia,et al.  Simple shear plastic deformation behavior of polycarbonate plate II. Mechanical property characterization , 2000 .

[36]  D. Lourdin,et al.  Influence of equilibrium relative humidity and plasticizer concentration on the water content and glass transition of starch materials , 1997 .

[37]  N. Gontard,et al.  Glass transition of wheat gluten plasticized with water, glycerol, or sorbitol. , 1999, Journal of agricultural and food chemistry.

[38]  H. Sue,et al.  Effects of clay orientation and aspect ratio on mechanical behavior of nylon-6 nanocomposite , 2005 .