Vpliv recikliranja HDPE na materialne lastnosti polimernega izdelka

Capuder, Žiga (author), Slemenik Perše, Lidija (mentor)

Zaradi splošne uporabnosti polimernih izdelkov narašča njihova uporaba, s tem pa se povečuje tudi število odpadkov. V skrbi za okolje želimo čim več odpadkov reciklirati, vendar to vpliva na materialne lastnosti polimerov. V okviru zaključne naloge smo se osredotočili na polietilen visoke gostote (HDPE) in pregledali vpliv recikliranja na mehanske, termične in tokovne lastnosti za mešanice surovega in večkrat recikliranega HDPE. Analizirane so bile mešanice surovega in 10x, 30x, 50x in 100x recikliranega materiala. Pri tem so bile v okviru te naloge opravljene meritve tokovnih lastnosti za vzorce z dodanim 10x in 30x recikliranim materialom, ostali rezultati pa so bili pridobljeni iz predhodno opravljenih nalog. Opravili smo amplitudne, frekvenčne in tokovne teste na rotacijskem reometru. Recikliranje skoraj nima vpliva na temperaturo taljenja in kristalizacije, drugače pa je pri stopnji kristaliničnosti. Ta se zmanjšuje s povečevanjem deleža recikliranega materiala in povečevanjem ciklov recikliranja, kar vpliva tudi na vrednosti trdote in modula elastičnosti. Opazili smo poslabšanje tokovnih lastnosti že pri 10x recikliranih vzorcih v mešanicah, kjer prevladuje recikliran material, pri večkratnem recikliranju pa je degradacija še večja. Vzrok za poslabšanje materialnih lastnosti pri večkratnem recikliranju so spremembe v strukturi materiala.

• Language: Slovenian
• Keywords: HDPE, recikliranje, mehanske lastnosti, termične lastnosti, reologija, tokovne lastnosti
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [Ž. Capuder]
• Year: 2021
• Number of pages: XV, 40 f.
• PID: 20.500.12556/RUL-130020
• UDC: 678.742.2:678.058.6:532.135(043.2)
• COBISS.SI-ID: 78507523
• Publication date in RUL: 10.09.2021

CAPUDER, Žiga, 2021, Vpliv recikliranja HDPE na materialne lastnosti polimernega izdelka [online]. Bachelor’s thesis. Ljubljana : Ž. Capuder. [Accessed 2 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=130020

Secondary language

• Language: English
• Title: Effect of HDPE recycling on material properties of polymer product

Abstract

Due to general applicability of polymer products, their use is increasing, and so does plastic waste. In care of the environment, we want to recycle as much waste as possible, but this affects the material properties of polymers. In research, we focused on high density polyethylene (HDPE) and studied the effect of recycling on mechanical, thermal and flow properties for blends of raw and recycled HDPE. Mixtures of raw and 10x, 30x, 50x and 100x recycled material were analysed. As part of this research, we measured flow properties for blends with added 10x and 30x recycled HDPE, other results were obtained from previous studies. We performed amplitude, frequency and flow tests on rotational rheometer. Recycling has almost no effect on melting and crystallization temperature, but more on degree of crystallinity. Degree of crystallinity decreases with increasing percentage of recycled material and increasing recycling cycles, which also affects the values of hardness and elastic modulus. Flow properties deteriorate already at 10x recycled samples in mixtures where recycled material predominates and degradation is even higher after more recycling cycles. The reason for degradation of material properties after multiple recycling cycles are changes in material structure.

• Keywords: HDPE, recycling, mechanical properties, thermal properties, rheology, flow properties