Search results for "chain extension"

showing 2 items of 2 documents

New phosphazene-based chain extenders containing allyl and epoxide groups

2003

In this paper we present the synthesis and the characterization of cyclophosphazenes substituted with allyl groups, their transformation in epoxide-containing cyclophosphazenes and the final utilization of these compounds as chain extenders in combination with polyamides. The reaction at high temperature of Nylon-6 with epoxy-functionalized cyclophosphazenes leads to the opening of the epoxy units by the action of both amino (--NH2) and carboxylic (--COOH) end-groups of the polymer to enhance the final molecular weight of this material. The consequences of this fact on the thermal, mechanical and visco-elastic properties of treated Nylon-6 have been also evaluated and compared to those of t…

Polymers and PlasticsGeneral Chemical EngineeringEpoxidechemistry.chemical_compoundPolymer chemistryMaterials ChemistryOrganic chemistryThermal stabilityPhosphazenechemistry.chemical_classificationchain extensionpolyamideGeneral ChemistryEpoxyPolymerNMREnd-groupSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiNylon 6chemistryvisual_artPolyamidecyclophosphazeneNylon-6; cyclophosphazenes; chain extension; polyamides; NMR.visual_art.visual_art_mediumnylon-6Designed Monomers and Polymers
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On the Preparation and the Characterization of Polyethylene/Polyamide Blends by Melt Processing in the Presence of an Ethylene(co)acrylic Acid Copoly…

2006

Samples of HDPE and PA6 have been meltprocessed in the presence of two new phosphazene compounds, CP-2EPOX and CP-2OXA together with an ethylene/ acrylic acid copolymer. The blends have been prepared in an industrial twin-screw extruder by using PA6 and PE in weight ratios of 25/75 and 75/25. When used, 5 phr of EAA and 0.2 phr of CP have been added. The materials have been completely characterized from a rheological, morphological, and mechanical point of view. The results indicate that the additives used caused an increase in the rupture tensile properties, of the impact strength and viscosity especially in the PE-rich blend in the presence of CP-2EPOX. This result can be attributed both …

polyethylenechain extensionpolyamidereactive processingcompatibilizationmorphologymechanical propertiepolymer blendphosphazene compound
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