Starch nanocrystals

Preparation of starch nanocrystal-reinforced NR nanocomposites is often by the solution mixing method. The general steps are depicted as follows the first step is preparation of starch nanocrystals. Starch nanocrystals were usually extracted from natural starch crops (such as maize,cassava, potato, wheat, eZc.) by hydrolysis in the presence of strong acids (such as sulfuric acid or hydrochloric acid).The second step is the mixing of the starch nanocrystal... [Pg.146]

Angellier-Coussy,H.,Putaux, J.-L.,Molina-Boisseau,S.,Dufresne,A.,Bertoft,E., Perez,S. (2008). The molecular structure of waxy maize starch nanocrystals. Carbohydr. Res. (In press). [Pg.95]

Putaux, J. -L., Molina-Boisseau, S., Momaur, T., Dufresne, A. (2003). Platelet nanocrystals resulting from the disruption of waxy maize starch granules by acid hydrolysis. Biomacromol, 4,1198-1202. [Pg.97]

Song, S., Wang, C., Pan, Z., Wang, X. (2008). Preparation and characterization of amphiphilic starch nanocrystals. Journal of Applied Polymer Science, 107,418-422. [Pg.444]

The reaction appears to be well suited for selective conversion of biomass carbohydrates into their corresponding oxidized derivatives. This system serves to oxidize several polymeric carbohydrates including starches and pullulan.445 49 More recent work has described the TEMPO-catalyzed introduction of carboxyl groups in native cellulose and its different morphological forms,45(M52 cellulose derivatives,453 and the surface of cellulose nanocrystals.454 The related biopolymer, chitin, also is oxidized under these conditions.455... [Pg.1502]

ANG 06] Angeller H., Molina-Boisseau S., Dole P., etal, Thermoplastic starch-waxy maize starch nanocrystals nanocomposites . Biomacromolecules, vol. 7, no. 2, pp. 531-539,2006. [Pg.192]

The cellulose based materials that are used as nano-reinforcements are cellulose nanocrystals (i.e. whiskers and nanospheres), nanofibrillated cellulose, regenerated cellulose nanoparticles and electrospun nanofibers. A wide range of polymer matrices have been used to form cellulose nanocomposites. Synthetic polymers such as polypropylene, poly(vinyl chloride) (PVC) [102], waterborne epoxy [103], waterborne polyurethane [104], polyurethane [105], poly-(styrene-co-butyl acrylate) [106], poly(oxyethylene) [107], polysiloxanes [108], polysulfonates [109], cellulose acetate butyrate [110,111], poly(caprolactone) [112], poly(viny 1 alcohol) [113] and poly (vinyl acetate) [114]. Different biopolymers such as starch-based... [Pg.34]

Angellier, H., Boisseau, S.M., Lebrun, L., Dufresne, A. Processing and structural properties of waxy maize starch nanocrystals reinforced natural rubber. J. Macromolecules. 38, 3783-3792 (2005a)... [Pg.112]

Kristo, E., Biliaderis, C.G. Physical properties of starch nanocrystal-reinforced pullulan films. Caibohydr. Polym. 68, 146-158 (2007)... [Pg.116]

The reinforcing effect of starch nanocrystals was attributed to strong filler/matrix interactions due to the hydrogen bonding. The decrease of the permeability suggests that the nanocrystals were well dispersed, with few filler/filler interactions. [Pg.146]

Figure 3.1 (a) SEM image of HA nanocrystals synthesized with gelatinized starch matrix ... [Pg.51]

Yang L, Ning X, Bai Y, Jia W. A scalable synthesis of non-agglomerated and low-aspect ratio hydroxyapatite nanocrystals using gelatinized starch matrix. Mater Lett 2013 113 142-5. [Pg.71]

The incorporation of platelet-Uke starch nanocrystals into natural rubber may remarkably enhance the barrier performances, e.g., of water vapor and oxygen (16,17). [Pg.149]

The preparation, properties and applications of polysaccharide nanocrystals in advanced functional nanomaterials have been reviewed (27). Cellulose based nanocrystals decompose and undergo a carbonization reaction over 250°C, whereas starch nanocrystals... [Pg.152]

TPS Waxy-maize/Glycerol/ Water cast film Reseach" starch nanocrystals [151]... [Pg.335]

Cellulose, Composites, Nanocomposites, Natural fibres, Lignocellulosic fibres. Cellulose whiskers, Chitin Whiskers, Starch nanocrystals... [Pg.401]

Compared to cellulose or chitin, the morphology of constitutive nanocrystals obtained from starch is completely different. Figure 19.12 shows a TEM obtained from a dilute suspension of waxy maize starch nanocrystals. They consist of 5-7 nm thick platelet-like particles with a length ranging 20-40 nm and a width in the range of 15-30 nm. The detailed investigation on the stmcture of these platelet-like nanoparticles was reported [36]. [Pg.414]

The barrier properties of starch nanocrystals/natural rubber nanocomposites were also investigated [39]. For these systems, the water vapour transmission rate, the diffusion coefficient of oxygen, the permeability coefficient of oxygen and its solubility, were measured. It was observed that the permeabiUty to water vapour, as well as to oxygen, decreased when starch nanocrystals wctc added These effects were ascribed to the platelet-like morphology of the nanocrystals. [Pg.416]

Angellier H., Choisnard L., Molina-Boisseau S., Ozil P., Dufresne A., Optimization of the preparation of aqueous suspensions of waxy maize starch nanocrystals using a response surface methodology. Biomacromolecules, 5(4), 2004, 1545-1551. [Pg.418]

Big Chemical Encyclopedia

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