Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Zein plastic

FT-IR analysis of film blown thermoplastic zein plasticized with polyethylene glycol highlighted the interdependence of structure and processing. Different batches of zein powder contained different ratios of p-sheets to a-helices and the best blown films were prepared from those with largest relative a-helical content. In turn, processing increased the a-helical content and decreased the presence of ordered p-sheet regions. Cross-links induced by y-radiation in whey, casein and soya films appeared to have reduced p-sheet regions." ... [Pg.230]

Good fihn-forming properties make sorghum kafirin a potential feedstock for biopolymer production. It has been demonstrated that kafirin films plasticized with glycerol and polyethylene glycol had similar tensile and water vapor barrier properties to the films made from commercial maize zein plasticized in the same way (Da Silva and Taylor, 2005). [Pg.14]

In this study it was seen that zein plastic sheets can be cast with tensile strengths as high as 6 MPa with strain to failure of 6%. In addition, ultrasonic treatment of the solution, prior to casting, reduced the tensile strength however, it did enhance the strain to failure. Lastly, the addition of nanoclay also reduced the tensile strength of the cast films. [Pg.1848]

Of these materials zein, the maize protein, has been used for plastics on a small scale. It can be cross-linked by formaldehyde but curing times are very long. Complicated bleaching processes have led to the production of almost colourless samples in the laboratory but the process cannot readily be extended to large-scale operation. The cured product has a greater water resistance than casein. Proteins from soya bean, castor bean and blood have also been converted into plastic masses but each have the attendant dark colour. [Pg.860]

Use Water-soluble lubricants solvents for dyes, resins, proteins plasticizers for casein and gelatin compositions, glues, zein, cork, and special printing inks solvent and ointment bases for cosmetics and pharmaceuticals intermediates for nonionic surfactants and alkyd resins. [Pg.237]

Several natural materials (waxes, clays, and asphalts) have rheological properties similar to synthetic products, but because they are not polymeric, are not considered true plastics. Certain proteins (casein, zein) are natural high polymers from which plastics are made (buttons and other small items), but they are of decreasing importance. [Pg.1000]

An increased interest has been shown in the use of biopolymers as material for food packaging, and NMR was employed to study the physicochemical properties of plasticized com zein films.103 The elucidation of freezing effects in foodstuffs was approached by studying the interactions between amino acids, sugars, and alcohols at temperatures below 273 K.104... [Pg.116]

Among other plasticizers, o- and p-toluene-sulfonamides are used to improve the processibility of urea and melamine resins, and cellulose-based adhesives. For the same reason, N-ethyl-o-toluenesulfonamide and N-ethyl-p-toluenesulfonamide are used for polyamides, casein, and zein. [Pg.136]

Figure 2.12. Tensile strength of zein films plasticized with different concentrations of polypropylene glycol. [Data from Tillekeratne M Easteal A J, Polym. Inti, 49, No.l, Jan.2000, p. 127-34.]... Figure 2.12. Tensile strength of zein films plasticized with different concentrations of polypropylene glycol. [Data from Tillekeratne M Easteal A J, Polym. Inti, 49, No.l, Jan.2000, p. 127-34.]...
Figure 15.7 Storage modulus (E ) and tan 8 as a function of temperature for (a-b) plasticized zein with 5,10, 15, 22, 30 and 40 per cent w/w of glycerol and (c-d) starch/zein blends with 22 per cent w/w of glycerol the proportions in the legend are starch zein. Reproduced with permission from Reference [138],... Figure 15.7 Storage modulus (E ) and tan 8 as a function of temperature for (a-b) plasticized zein with 5,10, 15, 22, 30 and 40 per cent w/w of glycerol and (c-d) starch/zein blends with 22 per cent w/w of glycerol the proportions in the legend are starch zein. Reproduced with permission from Reference [138],...
Corradini E., de Medeiros E.S., Carvalho A.J.E., Curvelo A.A.S., Mattoso L.H.C., Mechanical and morphological characterization of starch/zein blends plasticized with glycerol, J. Appl. Polym. Sci., 101, 2006, 4133-4139. [Pg.342]

Proteins are natural, renewable, and biodegradable polymers which have attracted considerable attention in recent years in terms of advances in genetic engineering, eco-friendly materials, and novel composite materials based on renewable sources. This chapter reviews the protein structures, their physicochemical properties, their modification and their application, with particular emphasis on soy protein, zein, wheat protein, and casein. Firstly, it presents an overview of the structure, classification, hydration-dehydration, solubility, denaturation, and new concepts on proteins. Secondly, it concentrates on the physical and chemical properties of the four important kinds of proteins. Thirdly, the potential applications of proteins, including films and sheets, adhesives, plastics, blends, and composites, etc. are discussed. [Pg.479]

Protein, Protein structure. Physicochemical properties. Industrial application, Denaturation, Soy protein, Zein, Wheat protein. Casein, Films, Adhesives, Plastics, Blends, Composites, Green materials. Biodegradability... [Pg.479]

Protein resin A generic term for resins derived from proteins, constituting casein plastics and zein. [Pg.797]


See other pages where Zein plastic is mentioned: [Pg.136]    [Pg.402]    [Pg.416]    [Pg.416]    [Pg.581]    [Pg.212]    [Pg.227]    [Pg.1846]    [Pg.136]    [Pg.402]    [Pg.416]    [Pg.416]    [Pg.581]    [Pg.212]    [Pg.227]    [Pg.1846]    [Pg.432]    [Pg.275]    [Pg.1205]    [Pg.112]    [Pg.615]    [Pg.89]    [Pg.1007]    [Pg.148]    [Pg.374]    [Pg.861]    [Pg.181]    [Pg.191]    [Pg.180]    [Pg.647]    [Pg.134]    [Pg.4975]    [Pg.334]    [Pg.483]    [Pg.484]    [Pg.485]    [Pg.197]    [Pg.570]    [Pg.526]    [Pg.336]   
See also in sourсe #XX -- [ Pg.581 ]




SEARCH



Zeins

© 2024 chempedia.info