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Ethylene–vinyl alcohol, EVOH, copolymers with two different vinyl alcohol compositions have been modified to incorporate different reactive functional groups by using phthalic anhydride, chloroacetyl chloride and 4-nitrophenyl chloroformate. Moreover, coupling reactions between EVOH copolymers functionalized with 4-nitrophenyl carbonate groups and three aminosaccharides (d-(+)-glucosamine, d-(+)-galactosamine...
The morphology and rheological properties have been studied for poly(tert-butyl acrylate-g-styrene), PtBA-g-S, graft copolymers through the analysis of different samples that varied in the number of grafted repeat units. Small-angle X-ray scattering (SAXS) measurements confirmed phase separation in these samples, and showed the presence of disordered microdomains on those copolymers with a grafting...
A family of amphiphilic poly(acrylic acid-g-styrene), P(AA-g-S), graft copolymers has been prepared by quantitative hydrolysis from poly(tert-butyl acrylate-g-styrene), P(tBA-g-S), precursors and evaluated by 1 H NMR and FTIR. The thermal characterization of these copolymers as a function of the number of grafted repeat units has been performed by thermogravimetric analysis, TGA, differential...
The radical polymerization of methyl methacrylate has been studied in toluene and benzonitrile at 30, 45 and 60°C using 2-2′ azobisisobutyronitrile as initiator. Under the conditions of our experiments both the rates of polymerization and the molecular weights of the polymer obtained are dependent on the nature of the solvent. Determination of the effective initiation rate and the coupled parameter...
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