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Solubilization of the polymers

The logical continuation of the stepladder strategy outlined above for minimizing the mutual distorsion of adjacent main chain phenylene units was the incorporation of the complete PPP-parent chromophore into the network of a completely planar ladder polymer. The complete flattening of the conjugated 7T-system by bridging of all the subunits should then lead to maximum conjuga-tive interaction. As with the PTHP 11 systems, alkyl or alkoxy side chains should lead to solubilization of the polymers. [Pg.177]

Latex thickening, a result of surfactant penetration and solubilization of the polymer, increases with the vinyl acetate content of vinyl acetate-butyl acrylate co-polymer latexes. [Pg.234]

Surfactants have also been used to overcome the solubility limitation of synthetic polymers in CO2 (most common synthetic polymers would be considered to be C02-phobic). For example, surfactants have been used to aid in the dispersion polymerization of poly(methylmethacrylate) (PMMA) in CO2 (58-60). The surfactants used in the polymerizations of PMMA are more accurately referred to as stabilizers. The C02-phobic region acts as anchor to the growing polymer, either by physical adsorption or by chemical grafting. The C02-philic region sterically stabilizes the growing polymer particles, preventing flocculation and precipitation. When a biopolymer is not soluble in CO2, specific surfactants may be designed to aid in the solubilization of the polymer into CO2. [Pg.17]

P/3BA Monolayers. All P/3BA monolayers were obtained on twice-distilled water, starting from two different spreading solvents. Spreading solvent I, composed of chloroform containing 0.8 vol % dichloroacetic acid, ensured complete solubilization of the polymer spreading solvent II... [Pg.358]

The complexation is reversible as the addition of acid dissolves the complex with release of ions and re-solubilization of the polymer inside the capsule. [Pg.73]

More likely, it may be concluded that 5 also plays a pivotal role in solubilization of the polymer in the heterogeneous reaction mixture and/or induces conformational changes in 4, thereby rendering the pendant ester groups more accessible towards attack by the amine. [Pg.149]

NMR spectroscopy is one of the most powerful techniques for the structural and physicochemical study of organic compounds, both small molecules and polymers. It seems to be highly suitable for studying NR-based blends and IPNs. Different NMR techniques have been used to study NR-based blends and IPNs, including NMR, and H NMR liquid state. However, only solid-state NMR can be used to study cured rubber, as this technique does not require the solubilization of the polymer. [Pg.480]


See other pages where Solubilization of the polymers is mentioned: [Pg.351]    [Pg.167]    [Pg.100]    [Pg.189]    [Pg.190]    [Pg.171]    [Pg.45]    [Pg.257]    [Pg.102]    [Pg.44]    [Pg.300]    [Pg.100]    [Pg.366]    [Pg.139]    [Pg.158]    [Pg.279]    [Pg.280]    [Pg.614]    [Pg.325]    [Pg.218]    [Pg.522]    [Pg.13]    [Pg.478]    [Pg.260]    [Pg.608]    [Pg.52]   


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