Search results for " SCIENZA"

showing 10 items of 1301 documents

An investigation of the compatibilization of blends of polyethylene and a semirigid liquid crystalline polymer

1996

The mechanical properties of blends with liquid crystalline polymers are in general poor and lower than those expected on the basis of additivity rule because of the strong incompatibility between the flexible and rigid components. Compatibilization is then necessary to enhance the adhesion between the two phases and then to improve the final properties of these blends. The addition of maleic anhydride functionalized polymers could give rise to some compatibilization because of possible reactions between the maleic anhydride group and the end groups of the liquid crystalline polymers. These reactions do not seem to occur in blends of polyethylene and a semirigid liquid crystalline polymer. …

polyethyleneSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialicompatibilizationLCPmechanical propertieblend

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The use of in-line quantitative analysis to follow polymer processing

2009

In this work it is presented three applications of real time analysis during extrusion process using an optical device developed by our research group, which applies the concepts of light extinction. Monitoring of polymer blends morphology takes place to infer data concerned to dispersed phase size and concentration. The detector also enables information about melting temperature of polymer during extrusion and the level of viscous heating, and the exfoliation step during processing of a polymer-clay nanocomposite.

polymer blend morphologychemistry.chemical_classificationWork (thermodynamics)Materials scienceNanocompositePolymers and PlasticsOrganic ChemistryDetectorPolymerCondensed Matter PhysicsExfoliation jointextrusionSettore ING-IND/22 - Scienza E Tecnologia Dei Materialichemistryin-line measurementviscous heatingPhase (matter)nanocompositesMaterials ChemistryExtrusionPolymer blendComposite material

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Recycling of Thermoset Materials and Thermoset-Based Composites: Challenge and Opportunity

2022

Thermoset materials and their composites are characterized by a long life cycle with their main applications in aircrafts, wind turbines and constructions as insulating materials. Considering the importance of recovery and valorization of these materials at their end-of-life, avoiding landfilling, the interest concerning their recycling grows continuously. The thermoset materials and their composites, to be successfully recovered and valorized, must degrade their three-dimensional structures and recover the mono-oligomers and/or fillers. The thermoset materials could successfully degrade through thermal treatment at different temperatures (for example, above 1000 °C for incineration, ca. 50…

polymer recycling recycling thermoset thermoset compositesSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiPolymers and PlasticsGeneral ChemistryPolymers

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Performances Recovery of Flax Fiber Reinforced Composites after Salt-Fog Aging Test

2022

In the present paper, the performance recovery under conditions of discontinuous exposure to a marine environment of a natural fiber-reinforced composite (NFRC) reinforced by flax fibers was assessed. In particular, this laminate was initially exposed to salt-fog for 15 and 30 days, and then stored in a controlled air condition for up to 21 days. The flax fiber-reinforced composite showed coupled reversible and irreversible aging phenomena during the wet stage, as well as evidencing a significant mechanical recovery during the dry stage. Unlike the stiffness, the laminate showed a noticeable recovery of its flexural strength. This behavior affected the composite material toughness. A simpli…

polymer–matrix composites (PMCs); environmental degradation; natural fibers; wet–dry; agingSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiCeramics and Compositesaging environmental degradation natural fibers polymer–matrix composites (PMCs) wet–dryEngineering (miscellaneous)

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