Priprava i karakterizacija PLA kompozita s kalcij karbonatnim punilma

undergraduate thesis

• Title (english): Preparation and characterization of PLA composites with calcium carbonate fillers
• Author: Tea Lovrinov
• Mentor: Elvira Vidović (mentor)
• Committee member: Elvira Vidović (predsjednik povjerenstva)
• Committee member: Fabio Faraguna (član povjerenstva)
• Committee member: Domagoj Vrsaljko (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-09-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Chemical Engineering in Material Development

Abstract

U ovom su radu provedena istraživanja utjecaja dodatka kalcij karbonata kao punila u polimernu matricu polilaktida. Pritom su korištena dva oblika kalcij karbonata: Socal (S) i Solvay (U). Uzorci su pripremljeni umiešavanjem u Brabender gnjetalici (masenih udjela punila 0,1; 0,5; 1 i 5 %) i umješavanjem u otopini (0,1 i 1 mas. %).
Ispitivana su mehanička i toplinska svojstva dobivenih kompozita koristeći dinamičko mehaničku analizu, diferencijalno pretražnu kalorimetriju, termogravimetrijsku analizu, univerzalnu kidalicu, te goniometar za mjerenja kontaktnog kuta.
Rezultati su pokazali poboljšanje svojstava s dodatkom kalcij karbonata kao punila u polimernu matricu. Rezultati DMA analize dali su uvid u primarne viskoelastične funkcije materijala. Moduli pohrane dobiveni DMA analizom viši su kod kompozita u odnosu na čisti polilaktid što pokazuje veću mogućnost materijala da podnese opterećenja. Iz DSC analize dobivene temperature i iznosi entalpije faznih prijelaza: staklišta, kristalizacije i taljenja pokazuju pomake prema višim temperaturama. TGA analiza pokazala je kako dodatak punila poboljšava toplinsku stabilnost materijala, a najbolje je rezultate imao kompozit s 0,1 mas. % oba punila. Također, znatno su poboljšana mehaniča svojstva za sve udjele punila. Ispitivanja goniometrom nisu dala jasne rezultate kako dodatak punila utječe na kontaknti kut kompozita i testnih kapljevina (voda, formamid i dijodometan).

Abstract (english)

In this study the addition of calcium carbonate as filler in PLA matrix was investigated. Two kinds of calcium carbonate were used: Socal (S) and Solvay (U). Samples were prepared by melt mixing in Brabender plasticoder (share of filler 0.1, 0.5, 1 and 5 wt. %) and in solution mixing (0.1 and 1 wt. %).
Mechanical and thermal properties were investigated using dynamic mechanical analysis, differential scanning calorimetry, thermogravimetric analysis, universal testing machine as well as surface properties by measuring contact angle with goniometer.
The results showed increased performance with the addition of calcium carbonate as filler in a polymeric matrix. DMA analysis results gave an insight into the primary viscoelastic material functions. Storage modules obtained are higher in the composite compared to pure polylactide indicating a greater ability of materials to withstand the load. The temperatures and enthalpy of phase transitions: glass transition, crystallization and melting obtained by DSC analysis show shifts towards higher temperatures. TGA analysis showed that the addition of filler improves the thermal stability of the materials, whereat the best results showed both composites containing 0.1 wt. % filler. Also, mechanical properties have been significantly improved for all shares of fillers. The results obtained on goniometer didn't give any clear conclusion on influence of added fillers on contact angle of composite and test liquids (water, formamide and diiodomethane).

• Keywords: polilaktid; kompoziti; punilo; kalcij karbonat
• Keywords (english): polylactide; composite; filler; calcium carbonate
• Language: croatian
• URN:NBN: urn:nbn:hr:149:324071
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2016-11-26 14:59:20