Utjecaj nano-ZnO na svojstva PLA/TPS mješavina

master's thesis

• Title (english): Influence of nano-ZnO on PLA/TPS blends properties
• Author: Hrvoje Dragozet
• Mentor: Mirela Leskovac (mentor)
• Committee member: Mirela Leskovac (predsjednik povjerenstva)
• Committee member: Domagoj Vrsaljko (član povjerenstva)
• Committee member: Lidija Furač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-09-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U posljednje vrijeme sve više raste briga o okolišu i svijest o nepovoljnom utjecaju plastičnog otpada na onečišćenje okoliša. Danas se kao ambalažni materijali najčešće koriste sintetski polimeri koji se dobivaju iz nafte. Velika iskorištavanja nafte ograničena su te uzrokuju globalne klimatske promjene, a dobiveni sintetski polimeri ne mogu se razgraditi u prirodi. Upravo iz tih razloga sve veći naglasak stavlja se na razvoj i korištenje biorazgadivih polimera. No njihova šira primjena je, u odnosu na sintetske polimerne materijale, još uvijek ograničena zbog lošijih svojstava i otežane prerade. Kako bi se nadvladali ti nedostatci i olakšala prerada, sve se više pažnje pridaje pripremi polimernih mješavina s dodatkom nanopunila koje će posjedovati željena svojstva važna za primjenu. Polilaktid (PLA) je trenutno jedan od široko proučavanih ekološki prihvatljivih polimera proizvedenih iz obnovljivih sirovina. Kako bi se proširilo područje njegove primjene često se miješa sa termoplastičnim škrobom (TPS-om). PLA/TPS mješavine pokazuju široku paletu fizikalnih svojstava koja se mogu kontrolirati promjenom uvjeta miješanja i udjela komponenata. Kako međusobno nisu mješljivi polimeri, dodatkom nanopunila moguće je povećati njihovu mješljivost, a time i poboljšati svojstva dobivenih polimernih mješavina. U ovom radu istražen je utjecaj nanopunila, ZnO, na svojstva PLA/TPS polimernih mješavina različitih omjera komponenata. Toplinska svojstva dobivenih mješavina ispitana su tehnikama diferencijalne pretražne kalorimetrije (DSC), termogravimetrijske analize (TGA) i mjerenjem toplinske vodljivosti. Mjerenjem kontaktnog kuta određena je slobodna površinska energija komponenata te su izračunati parametri adhezije. Mehanička svojstva određena su rasteznim ispitivanjem, a uvid u morfološku strukturu ispitan je pretražnom elektronskom mikroskopijom (SEM).

Abstract (english)

Recently, there has been a growing concern for the environment and awareness of the negative impact of plastic waste on pollution. Today, synthetic polymers derived from petroleum are the main materials used for packaging. The large petroleum deposits are limited and cause global climate change, and the resulting synthetic polymers cannot be degraded in nature. For this reason, increasing emphasis is being placed on the development and use of biodegradable polymers. However, their wider application is still limited compared to synthetic polymers due to their poorer properties and more difficult processing. To overcome these shortcomings and facilitate processing, increasing attention is being paid to the preparation of polymer blends with the addition of nanofillers that have the desired properties that are important for the application. Polylactide (PLA) is currently one of the most studied environmentally friendly polymers produced from renewable resources. To expand its range of applications, it is often blended with thermoplastic starch (TPS). PLA / TPS blends exhibit a wide range of physical properties that can be controlled by changing the blending conditions and component proportions. Since the polymers are not miscible with each other, it is possible to increase their miscibility by adding nanofillers and thus improve the properties of the obtained polymer blends. In this work, the influence of nanofillers, ZnO, on the properties of PLA / TPS polymer blends with different component ratios was investigated. The thermal properties of the obtained blends were investigated using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and thermal conductivity measurement techniques. The surface free energy of the components was determined by measuring the contact angle and the adhesion parameters were calculated. The mechanical properties were determined by tensile testing, and insights into the morphological structure were investigated by scanning electron microscopy (SEM).

• Keywords: polimerne mješavine; polilaktid (PLA); termoplastični škrob (TPS); nanopunilo ZnO
• Keywords (english): polymer blends; poly(lactide) (PLA); thermoplastic starch (TPS); nanofiller ZnO
• Language: croatian
• URN:NBN: urn:nbn:hr:149:509189
• Study programme: Title: Chemical 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: Access restricted to students and staff of home institution
• Created on: 2023-04-11 11:04:42