Search results for "Sisa"

Impact of hydrothermal ageing on the thermal stability, morphology and viscoelastic performance of PLA/sisal biocomposites

2016

The influence of the combined exposure to water and temperature on the behaviour of polylactide/sisal biocomposites coupled with maleic acid anhydride was assessed through accelerated hydrothermal ageing. The biocomposites were immersed in water at temperatures from 65 to 85 °C, between the glass transition and cold crystallisation of the PLA matrix. The results showed that the most influent factor for water absorption was the percentage of fibres, followed by the presence of coupling agent, whereas the effect of the temperature was not significant. Deep assessment was devoted to biocomposites subjected to hydrothermal ageing at 85 °C, since it represents the extreme degrading condition. Th…

Thermal stability of PP with acetylated sisal fiber: Romero Garc�a kinetic method

2003

This work deals the effect of acetylated and non-acetylated sisal fiber 011 thermal degradation of polypropylene. Applying the R-G method at constant conversion levels of 0.1, 0.3, 0.5, 0.7 and 0.9 to thermograms of the ”PP/untreated sisal fiber” blend, E, values of 99, 213, 224, 187, and 145 kJ/mol were obtained, whereas they were 99, 299, 255, 205, 154 kJ/mol for the “PP/treated sisal fiber” blend. On the other hand, with the R-G method at constant temperature, activation energies within the range of 156-417 kJ/mol were obtained for the “PP/treated sisal fiber” blend and within the range of 126-344 kJ/mol for the “PP/untreated sisal fiber” blend. Additionally, the method establishes as do…

Optimal manufacturing and mechanical characterization of high performance biocomposites reinforced by sisal fibers

2018

Abstract The increasing interest about eco-sustainable materials in the industrial production (automotive, civil construction, packaging), has led to the increase of the research works dealing with biocomposites. However, until now the most attention has been devoted to the development of short fiber biocomposites for non-structural applications, whereas only a few works have considered high performance biocomposites for structural applications. Consequently, the development of structural biocomposites from robust natural fibers, as sisal fibers, is a result expected from the scientific community, but not yet achieved. In order to give a contribution to the implementation of high performanc…

RESISTENZA STATICA E A FATICA DI NUOVI LAMINATI BIOCOMPOSITI RINFORZATI CON FIBRE DI AGAVE

2018

L’obiettivo di ridurre l’inquinamento legato alla produzione ed allo smaltimento dei materiali sintetici ha portato recentemente alla messa punto di normative di protezione ambientale che impongono l’uso crescente di materiali ecocompatibili e/o rinnovabili, e conseguentemente Ad un notevole interesse verso i cosiddetti biocompositi, materiali innovativi ottenuti attraverso il rinforzo di polimeri ecocompatibili o rinnovabili con fibre naturali quali lino, juta, canapa, agave ecc. Nonostante numerosi lavori di ricerca siano stati indirizzati a tali materiali, allo stato attuale pochi lavori hanno riguardato lo sviluppo di biocompositi ad elevate performance per applicazioni strutturali. Al …

IBRIDIZZAZIONE SUPERFICIALE MEDIANTE BASALTO DI BIOCOMPOSITI AD ELEVATE PERFORMANCE RINFORZATI CON FIBRE DI AGAVE

2022

Una delle principali limitazioni nell’uso pratico dei biocompositi polimerici rinforzati con fibre naturali (lino, canapa, agave, ecc.), specie in applicazioni di tipo “outdoor”, è costituita dalla bassa resistenza all’invecchiamento prodotto dagli agenti ambientali (UV, umidita, acqua ecc.), caratteristica questa in genere strettamente derivante dalla elevata idrofilia delle fibre naturali e dalla limitata protezione offerta in tal senso dalle matrici polimeriche, specie se di tipo termoindurente. Con riferimento ai biocompositi ad elevate performance rinforzati con fibre di agave, materiali già messi a punto in letteratura e pure ampiamente caratterizzati nelle loro interessanti proprietà…

PROVE DI INVECCHIAMENTO SU BIOCOMPOSITI EPOSSIDICI AD ELEVATE PERFORMANCE RINFORZATI CON FIBRE DI AGAVE

2021

La riduzione dell'impatto ambientale nella moderna produzione di materiali compositi a matrice polimerica ha attratto una significativa attività di ricerca finalizzata alla messa a punto di nuovi materiali compositi “green” caratterizzati altresì da una apprezzabile riduzione dei costi e del peso specifico. Tra questi materiali giocano un ruolo importante i cosiddetti biocompositi, materiali costituiti da matrici a basso impatto ambientale o rinnovabili, rinforzate con fibre naturali. Nel presente lavoro, attraverso una sistematica campagna di prove sperimentali sono analizzati gli effetti dei principali agenti ambientali sulle proprietà meccaniche di biocompositi ad elevate prestazioni cos…

Environmental aging effects on high-performance biocomposites reinforced by sisal fibers

2023

Among the innovative materials, an important role is played by the so-called biocomposites, generally made by an eco-friendly matrix reinforced with natural fibers. Unfortunately, due to the degradability of the green matrixes as well as to hydrophilicity of the natural fibers, the resistance of such innovative materials to the environmental agents is, in general, relativity low, and it can significantly limit their use in outdoor conditions. To contribute to the knowledge of the effects of the leading environmental agents on the mechanical properties of highperformance biocomposites made of a green epoxy matrix reinforced by agave fibers, a systematic experimental testing campaign has been…

Analysis of the Parameters Affecting the Stiffness of Short Sisal Fiber Biocomposites Manufactured by Compression-Molding

2021

The use of natural fiber-based composites is on the rise in many industries. Thanks to their eco-sustainability, these innovative materials make it possible to adapt the production of components, systems and machines to the increasingly stringent regulations on environmental protection, while at the same time reducing production costs, weight and operating costs. Optimizing the mechanical properties of biocomposites is an important goal of applied research. In this work, using a new numerical approach, the effects of the volume fraction, average length, distribution of orientation and curvature of fibers on the Young’s modulus of a biocomposite reinforced with short natural fibers were stud…

Las sisas del vino y del general de entradas tras las Cortes Valencianas de 1626

1982

Water absorption and hydrothermal performance of PHBV/sisal biocomposites

2014

[EN] The performance of biocomposites of poly(hydroxybutyrate-co-valerate) (PHBV) and sisal fibre subjected to hydrothermal tests at different temperatures above the glass transition of PHBV (TH ¿ 26, 36 and 46 C) was evaluated in this study. The influences of both the fibre content and presence of coupling agent were focused. The water absorption capability and water diffusion rate were considered for a statistical factorial analysis. Afterwards, the physico-chemical properties of water-saturated biocomposites were assessed by Fourier-Transform Infrared Analysis, Size Exclusion Chromatography, Differential Scanning Calorimetry and Scanning Electron Microscopy. It was found that the water d…