Utjecaj udjela rižinih ljuskica na toplinska svojstva biokompozita linearni polietilen niske gustoće (LLDPE) / rižine ljuskice (RLJ)

master's thesis

• Title (english): Effect of the rice husk concentration on the thermal properties of linear low density polyethylene (LLDPE) /rice husk (RH) biocomposites
• Author: Valeria Marjanović
• Mentor: Emi Govorčin Bajsić (mentor)
• Committee member: Emi Govorčin Bajsić (predsjednik povjerenstva)
• Committee member: Ljerka Kratofil Krehula (član povjerenstva)
• Committee member: Mirela Leskovac (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-07-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Polietilen (PE) jedan je od najjednostavnijih i najpoznatijih polimernih materijala sa širokom primjenom. Linearni polietilen niske gustoće (LLDPE) predstavnik je sintetskog ambalažnog materijala te se najčešće koristi kao ambalaža za pakiranje hrane ili u obliku vrećica. Cilj ovog rada bio je ispitati utjecaj udjela rižinih ljuskica i punila mTiO2 na toplinska svojstva biokompozita linearni polietilen niske gustoće (LLDPE)/rižine ljuskice (RLJ). Rižine ljuskice su nusproizvod nastao preradom riže koji se odvaja od riže tijekom procesa mljevenja te zbog svojih svojstava može imati široku primjenu. Dodatak RLJ u polimernu matricu doprinosi biorazgradnji, maloj težini, žilavosti i otpornosti na vremenske uvjete. Uz rižine ljuskice dodan je i rutil (mTiO2) koji je jedan od najpoznatijih punila zbog svojih izvrsnih svojstva kao što je stabilnost i otpornost pri visokim temperaturama. Biokompoziti LLDPE/RLJ/TiO2 pripremljeni su umješavanjem RLJ u udjelu od 10, 20, 30, 40 i 50 mas % i 5 mas % mTiO2 u čisti LLDPE u Brabender gnjetilici. Utjecaj udjela RLJ i mTiO2 na fazne prijelaze određen je DSC tehnikom dok je toplinska stabilnost ispitana TGA tehnikom u biokompozitima LLDPE/RLJ/TiO2. Na osnovi DSC rezultata dobivenih za LLDPE/RLJ/TiO2 biokompozite promjene u temperaturama taljenja i kristalizacije ukazuju da postoji određeni stupanj interakcija između LLDPE – a, RLJ i mTiO2. TGA rezultati pokazuju bolju toplinsku stabilnost LLDPE – a dodatkom mTiO2.

Abstract (english)

Polyethylene (PE) is one of the simplest and well-known polymeric material with widely used. Linear low-density polyethylene (LLDPE) is a synthetic polymer most commonly used in food packaging or plastic bag production. The aim of this study was to examine the influence of the rice husks content and mTiO2 on the thermal properties of linear low densitiy polyethylene (LLDPE)/rice husks (RH)/TiO2 biocomposite and it can be widely used due to its properties. The incorporation of RH into polymer matrices provides advantageous characteristics, such as biodegradability, light weight, toughness, and resistance to weathering. In addition to rice husks, rutile (mTiO2) was added, which is one of the most famous fillers due to its excellent properties such as stability and resistance to high temperatures. LLDPE/RH/TiO2 biocomposites were prepared by mixing RH in content of 10, 20, 30, 40 and 50 wt % of RH and 5 wt % of mTiO2 in the neat LLDPE in a Brabender mixer. By DSC techniques phase transitions while by TGA technique the thermal stability of the LLDPE/RH/TiO2 biocomposites were obtained with the respect of RH content and addition of mTiO2. According to DSC results for LLDPE/RH/TiO2 biocomposites changes in the melting (Tm) and crystallisation (Tc) temperature indicated that there was some degree of interaction between LLDPE, RH and mTiO2. The TGA results show that the LLDPE is more thermally stable with addition of mTiO2.

• Keywords: linearni polietilen niske gustoće; rižine ljuskice; mTiO2; biokompoziti; diferencijalna pretražna kalorimetrija; termogravimetrijska analiza; rutil
• Keywords (english): linear low density polyethylene; rice husks; mTiO2; biocomposites; differential scanning calorimetry; thermogravimetric analysis; rutile
• Language: croatian
• URN:NBN: urn:nbn:hr:149:824559
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2020-07-15
• Created on: 2022-03-06 14:39:49