EFFECT OF SILICA OBTAINED FROM RICE HUSK ON THE STRUCTURAL AND THERMAL PROPERTIES OF POLYLACTIC ACID/POLYETHYLENE GLYCOL FILMS

Yıl 2019, Cilt: 5 Sayı: 2, 91 - 96, 11.12.2019

Buğçe Aydın Feza Geyikçi

https://doi.org/10.22531/muglajsci.606112

Cited By: 2

Öz

Ambalaj sektöründe kullanılan plastik
malzemelerin çoğu petrol kökenlidir. Bu tür malzemeler doğada uzun yıllar
çözünmeyip atmosferdeki CO₂’in artmasına neden olur. Yenilenebilir
kaynaklardan elde edilen polilaktik asit (PLA) benzeri biyobozunur polimerler
petrol kökenli polimerlere alternatif olarak görülmektedir. PLA çevre dostu,
biyobozunur ve biyouyumlu olması gibi birçok avantaja sahip olmasına rağmen
düşük gaz bariyer özellikleri, termal dayanımı, kırılgan ve maliyetli olması
birçok uygulamada kullanımını sınırlamaktadır. Bu çalışmada ilk olarak atık
olarak görülen pirinç kabuğundan silika elde edilmiştir. Farklı katkı
yüzdelerinde (%5, 10 ve 20) silika %20 polietilen glikol (PEG) içeren PLA
çözeltilerine eklenmiş ve kompozit filmler çözücü döküm yöntemi ile
hazırlanmıştır. Filmlerin termal ve yapısal özellikleri Fourier Dönüşümlü
İnfrared Spektroskopi (FT-IR), Taramalı Elektron Mikroskobu (SEM),
Termogravimetrik Analiz (TGA), Diferansiyel Taramalı Kalorimetre (DSC) ve Su
Absorpsiyon Kapasitesi Testi ile belirlenmiştir. Analiz sonuçlarına göre,
silikanın PLA-PEG filmlerinin termal dayanımını iyileştirdiği ve su tutma
kapasitelerini artırdığı görülmüştür.

EFFECT OF SILICA OBTAINED FROM RICE HUSK ON THE STRUCTURAL AND THERMAL PROPERTIES OF POLYLACTIC ACID/POLYETHYLENE GLYCOL FILMS

Öz

Most of the plastic materials used in the
packaging industry are petroleum-based. These plastics do not decompose in soil
for many years and they lead to increase CO₂ in the atmosphere.
Biodegradable polymers derived from renewable resources such as polylactic acid
(PLA) are considered as promising alternatives to petroleum-based polymers.
Although PLA has attracted attention due to having properties such as biodegradable,
environment friendly, and biocompatible, it cannot be used in many applications
due to its poor gas barrier properties, low thermal stability, high brittleness,
and cost. In this study, in the first step silica was obtained from the rice
husk. The obtained silica (5,10 and 20%) were added to PLA solutions containing
20% polyethylene glycol (PEG) and the composite films were prepared using
solvent casting method. The thermal and structural properties of the composite
films were determined by Fourier Transform Infrared Spectroscopy (FT-IR),
Scanning Electron Microscope (SEM), Thermogravimetric Analysis (TGA),
Differential Scanning Calorimetry (DSC) and Water Absorption Capacity Test.
According to results of analysis, the addition of silica to the PLA-PEG films
improved the thermal stability and increased the water absorption capacities of
films.

Anahtar Kelimeler

Polylactic acid, Rice husk, Silica, Biodegradable polymer, Composite material

Kaynakça

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