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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...
The linear viscosity of m-LLDPE/LDPE blends is adjusted to a free volume model, conceived for miscible blends. A deviation from the model is observed at 47.5% m-LLDPE/52.5% LDPE blend, suggesting immiscibility in the molten state at this composition. Time–temperature superposition method is used to confirm miscible and immiscible cases. The effect of miscibility on practical rheological features is...
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 effect of temperature on extrusion rheometry of single site metallocene-catalyzed polyethylenes and polyethylene copolymers is investigated. Samples of molecular weight, M w , ranging from 90,000 to 330,000 and short-chain branching degree (SCB) from 0 to 21.2 CH 3 /1000C, as well as samples with a small amount of long-chain branching, are analyzed. It is observed that all the...
Free radical copolymerization of 2-hydroxyethyl methacrylate with butyl methacrylate using 3.0moll −1 N,N′-dimethyl formamide, DMF, solution and 9.0×10−3moll−1 of 2,2′ azobisisobutyronitrile, AIBN, as initiator, was carried out at 50°C. Experiments performed in bulk have evidenced the possible solvent effect in the values of monomer reactivity ratios. Besides, the homopolymers glass transition...
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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