Crosslinking, acid

Acrylonitrile N-methylol acrylamide Acrylamide Ethylene sulfonic acid Allyl sulfonic acid Crosslinker (3) Semicrystalline polymers (2)... [Pg.188]

Beet pectin and wheat-flour pentosans undergo an oxidative gelation (Neukom, 1976 Neukom and Markwalder, 1978) instigated by ferulic acid peroxidase through diferulic acid crosslinking. Crowe (1989) and Thibault et al. (1991) effected the same crosslinking with persulfate and chlorine, respectively. [Pg.62]

Provansal, M.M.P., Cuq, J.-L.A. and Cheftel, J.-C. (1975). Chemical and nutritional modifications of sunflower proteins due to alkaline processing. Formation of amino acid crosslinks and isomerization of lysine residues. J. Aqric. Pood Chem. 23, 938-943. [Pg.187]

CS nanogels were synthesized by carbodiimide coupling of CS with an oligo(ethylene glycol) dicarboxylic acid crosslinker in an aqueous homogeneous chemical gelation process [92], The hydrodynamic diameter of the resulting... [Pg.80]

In previous papers, we have (a) reviewed elimination reactions of disulfide bonds in amino acids, peptides, and proteins under the influence of alkali (5) (b) analyzed factors that may operate during alkali-induced amino acid crosslinking and its prevention (6) (c) demonstrated inhibitory effects of certain amino acids and inorganic anions on lysinoalanine formation during alkali treatment of casein, soy protein, wheat gluten, and wool and on lanthionine formation in wool ( 7, 9) (d) demonstrated that... [Pg.225]

Inoue K, Yamashiro M, Iji M (2009) Recyclable shape-memory polymer poly(lactic acid) crosslinked by a thermoreversible Diels-Alder reaction. J Appl Polym Sci 112 876-885... [Pg.287]

A different mechanism is postulated for acid crosslinking, involving the liberation of both isobutanol and its formal, ultimately producing crosslinked units as ... [Pg.332]

Polycarbophils are polymers of acrylic acid crosslinked with divinyl glycol. The molecular weight of these polymers is theoretically estimated to range from 700 000 to 3-4 billion. However, there are no methods currently available to measure the actual molecular weight of a crosslinked (i.e. three-dimensional) polymer of this type. [Pg.539]

Empirical formula calcium polycarbophil is the calcium salt of polyacrylic acid crosslinked with divinyl glycol. [Pg.540]

Starch is carboxymethylated by reacting it with sodium chloroacetate in an alkaline medium followed by neutralization with citric acid or some other acid. Crosslinking may be achieved either by physical methods or chemically by using reagents such as phosphorus oxytrichloride or sodium trimetaphosphate. [Pg.703]

The acid-crosslinkable prepolymers are polyester-alkyd, urea-formaldehyde, or melamine-formaldehyde resin adducts combined with a "blocked" acid catalyst that becomes "unblocked" at the dryer temperatures f7, 11, 12). e. g., a melamine-polyester resin adduct with "blocked" -toluenesulphonic acid catalyst (12). These acid-crosslinkable prepolymers are stable on the press distribution system but are converted to tiiree-dimensional polymer networks by heating to 275-325° F. [Pg.168]

Polybasic Acid Crosslinking Agents Acid-Peroxide Activators. Biased on encouraging cursory results obtained with glycols, a study was undertaken with Pohlman (12) to effect bonding using... [Pg.178]

Heterogenization of catalytic nanoparticles stabilized by block copolymers can be carried out by their incorporahon into porous membranes based on poly(acrylic acid) crosslinked with a difunctional epoxide [20-22]. Membranes with defined porosities and amounts of palladium were studied in the selective hydrogenahon of propyne to propene as a model reaction. The porosity of the polymer membrane, the content of catalyst, and the residence time of the reaction mixture were found to influence the conversion and selectivity. The main advantage of these membranes compared to other heterogeneous catalysts is simple adjustment to reaction conditions and fadhtated mass transfer. [Pg.94]

Definition Homopolymer of acrylic acid crosslinked with an allyl ether of pentaerythritol or an allyl ether of sucrose Properties Wh. fluffy powd., odorless dens. 1.41 anionic Toxicology LD50 (oral, rat) 4100 mg/kg mod. toxic by ingestion TSCA listed... [Pg.1025]

Definition Polymer of acrylic acid crosslinked with allyl ether of pentaerythritol... [Pg.1025]

Definition Polymer of acrylic acid crosslinked with allyl ether of sucrose Properties Wii. fluffy powd., si. char, odor when neutralized with alkali hydroxides or with amines, dissolves in water, alcohol, and glycerin m.w. nominally 3,000,000 vise. 30,500-39,400 cps (0.5% aq. disp.) pH 3 (1% disp.) anionic... [Pg.1026]

Definition Calcium sait of polyacrylic acid crosslinked with divinyi giycoi Empin cal (C2oHi8Ca40i8)n Properties Wh. to creamy wh. powd. insol. in water, dil. acids, dil. alkalis, common org. soivs. Toxicology LD50 (oral, rat) 20 g/kg Uses Bulking agent for pharmaceutical laxatives... [Pg.705]

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