2013 Annual Report
Objective 2: Develop novel technology to enable the commercial production of nanofibers from biopolymers. Objective 3: Develop commercially viable biobased polymers and polymer blends with improved functionality.
Objective 4: Develop technologies to enable the commercial production of non-fuel commodity bioproducts from agricultural and biorefinery feedstocks and byproducts.
In addition to composite materials, micro and nanofibers and/or nanoparticles will be made from biopolymers using a solution blow spinning technology recently developed. Biopolymer solutions will be used to make an array of micro and nanofibers with active agents that provide functionality for applications for medical products and personal hygiene items. Nanoparticles from starch and/or cellulose will be produced by chemical and mechanical means. The materials will be used to make nanocomposites with improved strength and modulus. Low molecular weight polyesters will be made based on di and triols/diacids that can plasticize polylactic acid (PLA) or polyhydroxyalkanoates (PHA). PLA and PHA polymers containing the plasticizers will be tested for strength and stability by recording mechanical properties. Green pathways for making styrene and terephthalic acid will be explored along with other WRRC cooperators. The Bioproducts Group’s main focus in this collaborative effort will be to assist in characterizing the mechanical and physical properties of the biopolymers and partnering with industry to facilitate scale-up. Non-fuel commodity bioproducts from crop residues, fish waste and wheat gluten will be made. Cellulose fiber will be extracted from crop residues and processed into bioproducts including agricultural mulches and tessellated fiber board. Bioproducts from fish waste will include gelatin polymers for biomedical applications such as tissue scaffolding. Nanofibers from fish gelatin or blends of fish gelatin and other polymers will be made by electrospinning. Processing parameters will be optimized and fiber properties will be characterized using microscopy and analytical methods. Antibiotics will be incorporated into the fibers and films. The antimicrobial effectiveness of fibers will be compared to films as to their effectiveness against different bacteria using an overlay inhibition technique. Work on wheat gluten bioproducts will also be performed with the goal of developing natural protein polymers from vital wheat gluten that can be chemically modified to impart greater ability to absorb water. Formerly 5325-41000-044-00D (6/09). Replacing 5325-41000-051-00D (8/10)
Progress was made on objective 2 where nanofibers were produced from fish gelatin and PLA using both electrospinning and solution blow spinning. Antimicrobial agents were incorporated into these fibers for controlled-release applications. The use of PLA nanofibers in metering the release of essential plant oils was also investigated. The nanofiber composites had improved mechanical properties and effectively controlled the release of the oil.
In research focused on objective 3, progress was been made in further developing a block-copolymer of d-lactide and a polyester for use in plasticizing PLA. The plasticizer improved the heat distortion temperature of PLA and a bio-based filler has been identified that further improved the heat distortion temperature. Efforts are being made to provide quantities of product to potential customers for evaluation.
As part of objective 4, phosphoric acid derivatives of vital wheat gluten were made and tested as sorbents for water, salt solutions, and ethanol in laboratory environments. The modified wheat gluten absorbed up to 78 times its weight in water. These materials were also added back to unmodified vital gluten at low concentrations and significantly altered the properties of the vital gluten during mixing by extending the stability of the material and retarding protein agglomeration. This suggests their possible use as a powerful modifier suitable for food applications and in preparing biobased product resins. The high degree of hydrophilicity may also overcome brittleness often reported for molded objects from biopolymers at low relative humidity. Several computational methods for analysis of gluten data using unique capabilities of Mathematica were advanced to enhance interpretation of gluten protein composition reported in two-dimensional electrophoresis vis a vis a polymer resource rather than a bread constituent. One of these methods led to a cover illustration for the cited article by Robertson, et al (Journal of Applied Polymer Chemistry).
Robertson, G.H., Blechl, A.E., Hurkman II, W.J., Anderson, O.D., Cao, T., Tanaka, C.K., Gregorski, K.S., Orts, W.J. 2013. Physical characteristics of genetically-altered wheat related to technological protein separation. Cereal Chemistry. 90(1):1-12.
Bilbao-Sainz, C., Chiou, B., Du, W., Gregorski, K.S., Orts, W.J. 2012. Influence of disperse phase characteristics on stability, physical and antimicrobial properties of emulsions containing cinnamaldehyde. Journal of the American Oil Chemists' Society. 90:233-241. DOI: 10.1007/S11746-012-2164-1.
Robertson, G.H., Hurkman II, W.J., Anderson, O.D., Tanaka, C.K., Cao, T., Orts, W.J. 2012. Differences in alcohol-soluble protein from genetically altered wheat using capillary zone electrophoresis, one- and two-dimensional electrophoresis and a novel gluten matrix association factor analysis. Cereal Chemistry. 90(1):13-23. DOI: 10.1094/cchem-10-11-0123.
Martinez-Sanz, M., Abdelwahab, M.A., Lopez-Rubio, A., Lagaron, J., Chiellini, E., Williams, T.G., Wood, D.F., Orts, W.J., Imam, S.H. 2013. Incorporation of poly(glycidylmethacrylate) grafted bacterial cellulose nano-whiskers in poly(lactic acid) nanocomposites: improved barrier and mechanical properties. European Polymer Journal. 49:2062-2072. DOI: http://dx.doi.org/10.1016/j.eurpolymj.2013.04.035.
Abdelwahab, M.A., Flynn, A., Chiou, B., Imam, S.H., Orts, W.J., Chiellini, E. 2012. Thermal, mechanical and morphological characterization of plasticized PLA-PHB blends. Polymer Degradation and Stability. 97(9):1822-1828.
Bilbao-Sainz, C., Chiou, B., De Campos, A., Du, W., Wood, D.F., Klamczynski, A., Glenn, G.M., Orts, W.J. 2012. Starch-lipid composites containing cimmamaldehyde. Starch. 64(3):219-228.
Robertson, G.H., Cao, T., Gregorski, K.S., Hurkman II, W.J., Tanaka, C.K., Chiou, B., Glenn, G.M., Orts, W.J. 2013. Modification of vital wheat gluten with phosphoric acid to produce high free solution capacity. Journal of Applied Polymer Science. DOI: 10.1002/app.39440.
Chen, H., Chiou, B., Wang, Y., Schiraldi, D.A. 2013. Biodegradable Pectin/clay Aerogels. ACS Applied Materials and Interfaces. 5:1715-1721.
Imam, S.H., Bilbao-Sainz, C., Chiou, B., Glenn, G.M., Orts, W.J. 2012. Biobased adhesives, gums, emulsions and binders: current trends and future prospects. Journal of Adhesion Science and Technology. DOI: 10.1080/01694243.2012.696892.
Avena-Bustillos, R.J., Chiou, B., Olsen, C.W., Bechtel, P.J., Olson, D.A., Mchugh, T.H. 2011. Gelation, oxygen permeability and mechanical properties of mammalian and fish gelatin films. Journal of Food Science. 76(7):E519-E524. DOI: 10.1111/j.1750-3841.2011.02312.x.
Chiou, B., Jafri, H.H., Avena Bustillos, R.D., Gregorski, K.S., Bechtel, P.J., Imam, S.H., Glenn, G.M., Orts, W.J. 2013. Properties of electrospun pollock gelatin/poly(vinyl alcohol) and pollock gelatin/poly(lactic acid) fibers. International Journal of Biological Macromolecules. 55:214-220.
Chiou, B., Jafri, H.H., Cao, T., Robertson, G.H., Gregorski, K.S., Imam, S.H., Glenn, G.M., Orts, W.J. 2013. Modification of wheat gluten with citric acid to produce superabsorbent materials. Journal of Applied Polymer Science. 129:3192-3197.