Search results for "Reactive extrusion"

showing 3 items of 3 documents

Evolution of the morphology and characterzation of compatibilized PBT/EVA blends prepared by reactive extrusion

2006

In this work, the possibility of preparing compatibilized blends of poly(butylene terephthalate) (PBT) and an ethylene vinyl acetate (EVA) copolymer by reactive extrusion in the presence of an ethylene acrylic acid copolymer (EAA) and a bisoxazoline compound (PBO) as compatibilization promoters has been studied. In addition, the evolution of the morphology of the blends under different annealing conditions in the presence and absence of the compatibilizing promoters has been studied. Binary blends of PBT and EVA showed behavior typical of incompatible blends with a gross morphology and bad mechanical performance. The situation was however different for ternary PBT/EVA/EAA and especially for…

Materials sciencePolymers and PlasticsOrganic ChemistryEthylene-vinyl acetateCompatibilizationReactive extrusionCondensed Matter Physicsblendchemistry.chemical_compoundextrusionchemistrymorphologyPolymer chemistryMaterials ChemistryCopolymerExtrusionPolymer blendPhysical and Theoretical ChemistryTernary operationIonomer
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Chemical Modification of Nitrile to Oxazoline Functionality on a Styrene-Acrylonitrile Copolymer in the Melt

1998

Oxazoline is a very interesting functionality for reactive extrusion and other applications. In this paper, we report the possibility of chemically transforming nitrile group attached to a copolymer of styrene and acrylonitrile (SAN) to oxazoline group using 2-amino-ethanol (AE). The chemical modification of SAN with AE was done in the molten state. Among various catalysts tested, zinc acetate turned out to be the most efficient. The effects of the catalyst concentration, temperature and mixing on the overall kinetics were studied. The formation of the expected oxazoline functionality was confirmed by infrared spectroscopy and by reacting with 1-naphthylacetic acid. The reaction between the…

Materials sciencecompatibilizationPolymers and PlasticsNitrilenitrilepoly-(butylene terephthalate)Chemical modificationGeneral ChemistryReactive extrusionCompatibilizationOxazolineStyrenechemistry.chemical_compoundSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiSANchemistryPolymer chemistryMaterials ChemistryCeramics and CompositesCopolymerOrganic chemistryPolyamide 6AcrylonitrileoxazolineJournal of Macromolecular Science, Part A
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Modyfikacja polietylenu kwasem itakonowym

2003

W celu nadania właściwości hydrofilowych, które powinny ułatwić rozkład odpadów w środowisku naturalnym, przeprowadzono szczepienie PE-LD kwasem itakonowym (KI) wobec nadtlenku dikumylu (DCP). Proces realizowano dwuetapowo w wytłaczarce jednoślimakowej, stosując różne stężenia KI (3—10% mas.) i DCP (do 1,1% mas.). Metodą pirolitycznej chromatografiigazowej (Py/GC/MS) zidentyfikowano produkty termicznego rozkładu KI. Analiza FT-IR wykluczyła ich obecność w kompozycjach po szczepieniu, natomiast sugerowała szczepienie KI. Metodą ekstrakcji wodnej ustalono, że wraz ze wzrostem stężenia KI i DCP wzrasta stopień szczepienia, natomiast w całym badanym zakresie stężeń DCP w kompozycjach zawierając…

kwas itakonowyreaktywne wytłaczaniepolyethylenereactive extrusionradical graftingsieciowanieszczepienie rodnikowecrosslinkingpolietylenitaconic acidmechanical propertieswłaściwości mechanicznePolimery
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