Poboljšanje mješljivosti u kompozitima poli(alkil-metakrilata) i celuloze kemijskom funkcionalizacijom

master's thesis

• Title (english): Miscibility improvement in composites of poly(alkyl methacrylates) and cellulose by chemical functionalization
• Author: Matej Štivojević
• Mentor: Ante Jukić (mentor)
• Committee member: Ante Jukić (predsjednik povjerenstva)
• Committee member: Davor Dolar (član povjerenstva)
• Committee member: Fabio Faraguna (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Chemical Engineering in Material Development

Abstract

Polimerni kompoziti danas, zbog svojih svojstava, imaju brojne primjene u različitim granama ljudske djelatnosti i omogućavaju napredak svakodnevnog života. Celuloza kao punilo u kompozitima sve se više koristi zbog svoje velike dostupnosti, bioobnoljivosti i biorazgradljivosti zbog čega pridonosi zaštiti okoliša, na što se danas stavlja veliki naglasak. Osnovni problem primjene celuloze kao punila u polimernim kompozitima je njena mješivost s polimernom matricom. Kako bi se mješivost poboljšala, celuloza se kemijski modificira dodavanjem različitih funkcionalnih skupina. U ovom radu je pripravljeno 11 kompozita radikalskom polimerizacijom na bazi homopolimera poli(metil-metakrilata) i kopolimera poli(metil-metakrilata-ko-oktadecil-metakrilata) u molarnom omjeru 90:10 koji su upotrebljeni kao matrice te celuloze, odnosno kemijski modificirane celuloze, kao punila, u različitim masenim udjelima (1, 2,5 i 5 %). Celuloza se kemijski modificirala cijepljenjem poli(metil-metakrilatom) i na taj način se pokušala poboljšati njena mješivost u matrici. Pripravljenim polimerima, odnosno kompozitima, određivana su i uspoređivana neka ključna svojstva, poput raspodjele molekulskih masa, raspodjela punila u matrici, temperatura toplinskih prijelaza i toplinske stabilnosti. Navedena svojstva mjerena su različitim metodama karaterizacije: kromatografijom na propusnom gelu (GPC), pretražnom elektronskom mikroskopijom (SEM), diferencijalnom pretražnom kalorimetrijom (DSC) i termogravimetrijskom analizom (TGA).

Abstract (english)

Polymer composites today, due to their properties, have numerous applications in different branches of human activity and allow the advancement of everyday life. Cellulose as a filler in composites is increasingly used because of its high availability, biodegradibility and biodiversity, and contributes to environmental protection, which is currently being more and more popular. The basic problem of cellulose in composites is its matrix miscibility. To improve the miscibility, cellulose is chemically modified by adding different functional groups. In this work, 11 composites were synthesized by radical polymerization based on poly(methyl-methacrylate) homopolymer and poly(methyl-methacrylate-ko-octadecyl-methacrylate) copolymers which were used as matrices, while cellulose and chemically modified cellulose were used as fillers in various weight percentages (1, 2,5 and 5 %). To get improvement in miscibility, cellulose was chemically modified with poly(methyl-methacrylate). Some key composite properties, such as molecular mass distribution, matrix and filler distribution, thermal transition temperature, and thermal stability, were determined. These properties were measured by various methods such as: gel permeation chromatography (GPC), scanning electron microscopy (SEM), dynamic-mechanical analysis (DSC) and thermogravimetric analysis (TGA).

• Keywords: kompoziti; celuloza; alkil-metakrilati; radikalska polimerizacija; GPC; SEM; DSC; TGA
• Keywords (english): composites; cellulose; alkyl-methacrylates; radical polymerization; GPC; SEM; DSC; TGA
• Language: croatian
• URN:NBN: urn:nbn:hr:149:630864
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-10-30 11:20:05