2021.
Undergraduate thesis
University of Zagreb, University of Zagreb, Faculty of Chemical Engineering and Technology
https://urn.nsk.hr/urn:nbn:hr:149:833932
Polimerni nanokompoziti hibridni su organsko-anorganski materijali kojima je najmanje jedna dimenzija punila manja od 100 nm. Postoje različite vrste punila, a jedno od njih je i grafen, dvodimenzionalan atomski kristal koji zahvaljujući svojim izvanrednim svojstvima sve češće pronalazi svoje mjesto u naprednim materijalima i tehnologijama. U ovome su radu iznesena dosadašnja saznanja o utjecaju grafena na svojstva polimernih materijala. Proučavao se utjecaj grafena na mehanička svojstva, električnu i toplinsku vodljivost, toplinsku stabilnost, gorivost te propusnost polimernih materijala. Dodatkom grafena dolazi do porasta Youngovog modula elastičnosti i vlačne čvrstoće, porasta električne vodljivosti zbog stvaranja vodljive mreže te porasta toplinske vodljivosti. Najveći naglasak u istraživanju toplinske vodljivosti nanokompozita na bazi grafena ili s ugljikovim nanočesticama je na kompozitima s epoksidnom matricom zbog postignutih značajnih poboljšanja toplinske vodljivosti. Dodatak grafena u polimernu matricu utječe i na toplinsku stabilnost te gorivost. Smanjenje gorivost je vrlo poželjno svojstvo za mnoge primjene, a do njega dolazi zbog stvaranja barijernog učinka na površini polimera što smanjuje razmjenu topline i mase između plina i kondenzirane faze te štite materijal od daljnjeg izgaranja. Nadalje, dodatak grafena utječe i na propusnost polimernih materijala. Do smanjenje propusnosti dolazi zbog nastajanja mreže slojeva grafena te posljedično molekula koja difundira mora preći duži put u odnosu na put koji bi morala proći ukoliko nanopunilo ne bi bilo prisutno. Tijekom posljednjeg desetljeća, interes za nanokompozite je porastao kako u znanosti tako i u industriji zbog niže cijene te značajnog poboljšanja svojstva konvencionalnih polimera dodatkom male količine nanoaditiva.
polimerni nanokompoziti grafen električna vodljivost toplinska vodljvost propusnost gorivost mehanička svojstva toplinska stabilnost
Authors Delač, Vanessa (Author)
Advisors Lučić Blagojević, Sanja (Thesis advisor)
Committee members Lučić Blagojević, Sanja (Committee chair) ; Leskovac, Mirela (Committee member) ; Movre Šapić, Iva (Committee member)
Alternative titles
(English) Polymer nanocomposites based on graphene
Alternative abstracts
(English) Polymer nanocomposites are hybrid organic-inorganic materials with at least one dimension of the filler phase less than 100 nm. There are many different types of fillers, and one of them is graphene, a two dimensional atomic crystal which, thanks to its extra ordinary properties, is increasingly finding its place in modern technologies. To date findings of graphene influence on polymer properties have been presented in this thesis. The influence of graphene on mechanical properties, electric and heat conductivity, heat stability, burning properties and permeability has been studied. By adding graphene, an increase of Young's modulus of elasticity and tensile strength is obtained, increase in electrical conductivity due to creation of conductive net as well as increase in heat conductivity. The biggest emphasis in heat conductivity researchof graphene based nanocomposite is on epoxy matrix composites due to significant heat conductivity increase achieved. Adding graphene to polymer matrix affects also heat stability and flammability properties. Decrease of flammability is a very desirable property in many applications and is achieved by creating barrier effect on polymer surface which reduces heat exchange between gas and condensed phase thus protecting the material from further burning. In addition, adding graphene affects also the permeability of polymers. Decrease of permeability is caused by the creation of net of graphene layers causing the diffusing molecule to pass a longer path compared to a path with no nanofiller present. Over the last decade, interest in nanocomposites has increased in both science and industry due to lower cost and significant improvement in the properties of conventional polymers by the addition of a small amount of nanoadditives.
Alternative keywords
polymer nanocomposites
graphene
electrical conductivity
thermal conductivity
permeability
flammability
mechanical properties
thermal stability
Degree grantor
University of Zagreb, University of Zagreb, Faculty of Chemical Engineering and Technology
Study program
Primijenjena kemija; smjerovi: Kemija u zaštiti okoliša i izvori energije, Specifični materijali i napredne tehnologije, Primijenjena organska kemija; university; undergraduate
Areas, fields, branches
Technical Sciences / Chemical Engineering
Dates
Defence date: September 24, 2021
Languages
Croatian
Object creation date
March 27, 2023
Identifiers
