1,721,050 research outputs found
Influence of the transesterification catalyst structure on the reactive compatibilization and properties of poly (ethylene terephthalate) (PET)/dibutyl succinate functionalized poly(ethylene) blends
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POLYMERS WITH OXIME GROUPS - REACTIVITY OF KETOAROMATIC SIDE-CHAINS TOWARDS HYDROXYLAMINE
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Dynamic behaviour of fluorinated surfaces obtained from short and long side chain acrylate copolymers
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Molecular and mechanistic aspects of the functionalization of polyolefins with ester groups
No full textIn the present paper the functionalization reaction of polyolefins in the melt with diethylmaleate (DEM) in the presence of peroxide is revisited. The process was analyzed on the basis of several experiments carried out in the Brabender mixer with 30 min residence time and at constant temperature, 190 degrees C for EPR and 200 degrees C for LLDPE samples, while varying the number of branching in the starting polyolefin, the amount of DEM and of dicumyl peroxide (DCP). For reference purposes similar experiments were also examined as performed with EPDM and isotactic polypropylene (PP)
FUNCTIONALIZATION OF POLYOLEFINS - STRUCTURE OF FUNCTIONAL-GROUPS IN POLYETHYLENE REACTED WITH ETHYL DIAZOACETATE
No full textBlending of styrene-block-butadiene-block-styrene copolymer with sulfonated vinyl aromatic polymers
No full textDifferent polymers containing sulfonic groups attached to the phenyl rings were prepared by sulfonation of polystyrene (PS) and styrene-block- (ethylene-co-1-butene)-block-styrene (SEBS). The sulfonation degree (SD) was varied between 1 and 20mol% of the styrene units. Polyphase materials containing sulfonated units were prepared by blending styrene-block-butadiene-block-styrene (SBS), with both sulfonated PS and sulfonated SEES in a Brabender mixer. Such a procedure was performed as an alternative route to direct sulfonation of SBS which is actually not selective towards benzene rings because of the great reactivity of the double bonds in polybutadiene (PE) blocks to sulfonation agents. Thermal and dynamic-mechanic analysis, together with morphology characterization of the blends, is consistent with obtaining partially compatible blends characterized by higher T, of the polystyrene domains and improved thermal stability
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