Reologija polimerno - kovinskih kompozitov z visoko koncentracijo kovinskih delcev

Kopušar, Tim (author), Slemenik Perše, Lidija (mentor)

Visoko polnjeni kompoziti so običajno polimeri z visoko koncentracijo organskih ali anorganskih delcev. Matrici polimera se dodajo trdni delci in novo nastali material prevzame lastnosti obeh snovi. Razvoj na tem področju teži k optimalnemu kombiniranju lastnosti obeh sestavin. Kombiniranje polimerov s trdnimi delci ima tako velik industrijski pomen, saj predstavlja učinkovit način pridobitve novih materialov z želenimi mehanskimi, termičnimi, magnetnimi, ipd. lastnostmi. Cilj zaključne naloge je določiti vpliv različnih koncentracij kovinskih magnetnih delcev v polimeru poliamida na termične in reološke lastnosti kompozitnega materiala. Pod vplivom konstantnih merilnih pogojev temperature in frekvence obremenitve smo določali stabilnost materiala v izbranem časovnem intervalu. Pri tem je potrebno določiti linearno viskoelastično območje materiala, kjer je odziv polimera sorazmeren in linearen vsiljeni strižni deformaciji. Določili smo tudi vpliv koncentracije kovinskih delcev in naraščajoče strižne napetosti na viskoznost materiala ter vpliv temperature na viskoelastične lastnosti materiala v temperaturnem območju od 170 do 240°C. Ugotovili smo, da koncentracija magnetnih delcev vpliva na zmanjšanje specifične toplote materiala. Določili smo točko taljenja in steklastega prehoda za preiskovane materiale. Ugotovili smo, da višja kot je koncentracija kovinskih delcev v polimeru, krajše je območje linearnega odziva polimera, višja je njegova viskoznost ter večje so vrednosti elastičnega in viskoznega modula materiala.

• Language: Slovenian
• Keywords: polimeri, visoko polnjeni kompoziti, poliamidi (PA), viskoelastičnost, reološke lastnosti, viskoznost
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [T. Kopušar]
• Year: 2021
• Number of pages: XIV, 38 str.
• PID: 20.500.12556/RUL-130353
• UDC: 532.135:678.7:669(043.2)
• COBISS.SI-ID: 84482051
• Publication date in RUL: 14.09.2021

Secondary language

• Language: English
• Title: Rheology of polymer - metal composites with a high concentration of metal particles

Abstract

Highly filled composites are polymers with high concentration of organic or inorganic particles. Particles are added to the polymer matrix and the newly formed material exhibits the properties of both substances (from polymer and filler particles). Development in this field is leaning towards optimal combination of properties, from both components. Combining polymers with solid particles is a great industrial importance and efficient way to obtain new materials with desired mechanical, thermal, magnetic, etc. properties. The aim of the thesis is to determine the influence of different concentrations of magnetic particles in polyamide, to determine thermal and rheological properties of the materials. One of the goals was also to determine the stability of material in time period under constant measuring conditions of temperature and strain frequency and to determine the range of linear viscoelastic response of the material. Moreover, we wanted to determine the influence of concentration of metal particles and increasing shear stress on material viscosity and the influence of temperature on viscoelastic properties of the material in temperature range from 170 to 240°C. The results showed that the concentration of metal magnetic particles reduces the specific heat of the material. We determined the melting point and the temperature of glass transition for all the materials. We found out that at higher particle concentration in polymer, the range of its linear response is shorter, the viscosity of the composite is higher and the values of storage and loss modulus of the material are higher.

• Keywords: polymers, highly filled composites, polyamide (PA), viscoelasticity, rheological properties, viscosity