Search results for "Composite"

Polypropylene/graphene nanoplatelets nanocomposites subjected to elongational flow

2018

In this work the effect of the presence of graphene nanoplatelets (GnP) on the morphology and mechanical properties of polypropylene/GnP nanocomposites has been investigated when these polymer systems are subjected to non-isothermal elongational flow in a melt spinning operation. The presence of the GnP magnifies the effect of the elongational flow. Indeed, the elastic modulus and the tensile strength increases with the orientation more than that observed for the pure matrix.

Photo-oxidative behavior of PP/GnP nanocomposites

2018

In this work the photo-oxidative behavior of neat polypropylene (PP) and PP based nanocomposites incorporating graphene nanoplatelets (GnP) was studied. In particular, the influence of the amount of incorporated GnP was evaluated. The photo-oxidation has been followed by monitoring the change of the rheological, mechanical and spectroscopic properties upon artificial exposure to UV-B light. The results revealed that the presence of GnP reduced the rate of photooxidation of the PP matrix and, in the investigated composition range, the photo-stabilizing action improved with increasing the GnP content.

Effect of Different Matrices and Nanofillers on the Rheological Behavior of Polymer-Clay Nanocomposites

2010

In this work, a comprehensive study of the rheologi-cal behavior under shear and isothermal and nonisothermal elongational flow of low density polyethylene (LDPE) and ethylene-vinyl acetate copolymer (EVA) based nanocomposites was reported to evaluate their "filmability", that is, the ability of these material to be processed for film forming applications. The influence of two different kinds of organoclay - namely Cloisite 15A and Cloisite 30B - and their concentration was evaluated. The presence of filler clearly affects the rheological behavior in oscil-latory state of polyolefin-based nanocomposites but the increase of complex viscosity and the shear thinning are not dramatic. A larger …

Mechanism of formation of char coating in LDPE/organoclay nanocomposites

2009

Characterization of annealed LDPE/clay nanocomposites

2009

Clay nanocomposites based on compatibilized PA6/HDPE blends

2009

Failure mechanisms of flax/epoxy laminates with open hole: a failure map

2017

Aim of this paper is the investigation of the pin/hole contact stress and failure mechanisms of flax/epoxy composite laminates underwent to tensile bearing tests. In particular, the maximum loads and failure modes are evaluated at varying joint geometry. In order to optimize the use of composite materials in structural applications, an experimental failure map, identifying main failure modes of mechanically fastened joints, is obtained by evaluating failure modes (i.e., net tension, shear out, cleavage and bearing) as a function of the pin diameter and the position of the hole from the free edge of the laminate. Main goal of this paper is give a simple experimental methodology to support th…

SVILUPPO DI SISTEMI CON STRUTTURE COMPLESSE A BASE BIOPOLIMERICA REALIZZATI ATTRAVERSO PROCESSI COMBINATI IN MULTI- O IN ONE-STEP

2022

L'analisi dello stato dell'arte suggerisce che la combinazione di processi di produzione, solitamente impiegati per l’elaborazione di strutture differenti, comporta la produzione di dispositivi a base biopolimerica con strutture complesse e proprietà rilevanti. L'obiettivo di questo lavoro di ricerca è stato quello di esplorare i diversi vantaggi dei metodi di elaborazione combinati sia in one-step che in two-steps. In particolare, sono state testate diverse combinazioni di processing al fine di ottenere dispositivi a base biopolimerica con strutture e proprietà non ottenibili da singoli processi, trattamenti o materiali. Ogni dispositivo è stato caratterizzato al fine di comprendere le rel…

3D PRINTED GREEN COMPOSITES BASED ON POLYMERIC MATRICES AND ANCHOVY FISHBONE WASTES

Advances in selective conversions by heterogeneous photocatalysis

2010

Selective photocatalytic conversions are offering an alternative green route for replacing environmentally hazardous processes with safe and energy efficient routes. This paper reports the most recent advances in the application of heterogeneous photocatalysis to synthesize valuable compounds by selective oxidation and reduction.