Příprava biokompozitních termoplastických laminátů s nanofibrilami celulózy
Loading...
Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Tato diplomová práce je rozdělena na dvě části. Teoretická část popisuje druhy kompozitních a nanokompozitních materiálů, jejich plniva, převážně poté přírodní vlákna. Dále je charakterizován polymer PLA, který je v dnešní době pro svou odbouratelnost často studován a modifikován. Pozornost je věnována také problematice submikronových plniv, konkrétně pak nanocelulóze. Podrobněji je popsána příprava a vlastnosti celulózových nanofibril. V experimentální části je realizována výroba biodegradovatelného kompozitního laminátu tvořeného PLA, konopnou tkaninou a nanocelulózovou suspenzí. Suspenze nanofibril byla připravena pomocí enzymatické předúpravy endoglukanázou s následnou defibrilací na ultrajemném frikčním mlýnu. Výroba laminátu byla provedena v experimentálním přípravku, který byl navržen a vyroben pro tento účel. Z laminátů byla poté vyrobena zkušební tělíska, na nichž byly zkoumány vybrané vlastnosti, a to na základě zkoušky v ohybu, tahu i zkoušek rázové houževnatosti. Dále byla zkoumána morfologie připravených nanofibril a lomových ploch porušených vzorků.
This thesis is divided into two parts. The theoretical part defines the types of composite and nanocomposite materials, their fillers, mostly natural fibrils. Subsequently, the polymer PLA is described, which is now often studied and modified for its degradability properties. Attention is also paid to the issue of submicron fillers, in particular nanocellulose. The preparation and properties of cellulose nanofibrils are explained in more detail.The experimental part was carried out by the production of a biodegradable composite laminate consisting of PLA, hemp fabric and nanocellulose suspension. The nanofibril suspension was prepared by enzymatic pre-treatment with endoglucanase, followed by defibrillation on an ultrafine friction mill. The production of the laminate was performed in an experimental preparation which was designed and manufactured just for this purpose. Subsequently, test specimens were made of laminates and selected properties were investigated, based on flexural, tensile and impact toughness tests. Furthermore, the morphology of the prepared nanofibrils and fracture surfaces of the damaged samples were examined.
This thesis is divided into two parts. The theoretical part defines the types of composite and nanocomposite materials, their fillers, mostly natural fibrils. Subsequently, the polymer PLA is described, which is now often studied and modified for its degradability properties. Attention is also paid to the issue of submicron fillers, in particular nanocellulose. The preparation and properties of cellulose nanofibrils are explained in more detail.The experimental part was carried out by the production of a biodegradable composite laminate consisting of PLA, hemp fabric and nanocellulose suspension. The nanofibril suspension was prepared by enzymatic pre-treatment with endoglucanase, followed by defibrillation on an ultrafine friction mill. The production of the laminate was performed in an experimental preparation which was designed and manufactured just for this purpose. Subsequently, test specimens were made of laminates and selected properties were investigated, based on flexural, tensile and impact toughness tests. Furthermore, the morphology of the prepared nanofibrils and fracture surfaces of the damaged samples were examined.
Description
Subject(s)
biopolymery, PLA, celulóza, nanokompozity, laminát, mechanické vlastnosti, biopolymers, PLA, cellulose, nanocomposites, laminate, mechanical properties