Isıl Yaşlandırmanın Yüksek Yoğunluklu Polietilen/Fındık Kabuğu Polimer Kompozitinin Mekanik Özelliklerine Etkisi

Year 2022, Volume: 3 Issue: 1, 1 - 9, 31.03.2022

Münir Taşdemir

Abstract

Selülozik bazlı doğal malzemeler uzun yıllardan beri plastiklerde güçlendirilme malzemesi olarak yaygın bir biçimde kullanılmaktadırlar.
Bu malzemelerin kullanılma nedenleri arasında maliyetlerinin düşük olması, yüksek fiziksel ve mekanik dirençe sahip olmaları sayılabilir.
Öğütülmüş fındık kabuğu plastik kompozitlerde dolgu malzemesi olarak da kullanılmaktadır. Türkiye’de fındık büyük ölçüde üretilmekte
ve dünyada ilk sırada yer almaktadır ancak kabukları genellikle evlerde yakılarak ısınma amaçlı kullanılmaktadır.
Bu çalışmada, fındık kabuğu tozu oranının ve 100 oC’de ısıl yaşlandırma süresinin (0, 15 ve 30 gün) yüksek yoğunluklu polietilen
kompozitinin mekanik özelliklerine etkileri incelenmiştir. İlk olarak fındık kabukları halkalı öğürücüde öğütülmüştür. Ağırlıkça %5, 10, 15
ve 20 oranlarında fındık kabuğu tozu yüksek yoğunluklu polietilene eklenerek çift vidalı ekstrüzyon makinesinde karıştırıldı. Daha sonra
elde edilen kompozitten enjeksiyon makinesinde çekme, Izod darbe, sertlik ve yoğunluk test numunelere basılarak testler gerçekleştirildi.
Yapılan testler sonucunda yüksek yoğunluklu polietilene fındık kabuğu tozunun ilavesiyle elastiklik modülü, akma mukavemeti, çekme
mukavemeti, % uzama değeri, yoğunluk, sertlik ve Izod darbe dayanımı değerlerinin azaldığı görüldü. Ayrıca yüksek yoğunluklu polietilen/
fındık kabuğu tozu polimer kompozitlerinin mekanik özellikleri (% uzama hariç), ısıl yaşlandırma süresinin (15 ve 30 gün) artmasıyla
arttığı görüldü.

Keywords

Yüksek yoğunluklu polietilen, fındık kabuğu tozu, mekanik özellikler, ısıl yaşlandırma

Supporting Institution

Marmara Üniversitesi Bilimsel Araştırma Projeleri Kordinasyon Birimi

Project Number

FEN-C-YLP-100719-0252

Effect of Thermal Aging on the Mechanical Properties of High Density Polyethylene/Nut Shell Polymer Composite

Abstract

Cellulosic-based natural materials have been widely used as a reinforcement material in plastics for many years. Among the reasons for
using these materials are their low cost, high physical and mechanical resistance. Ground hazelnut shells are also used as filling material in
plastic composites. Hazelnuts are produced on a large scale in Turkey and are in the first place in the world, but their shells are generally
burned in homes and used for heating purposes.
In this study, the effects of additions of hazelnut shell powder content and thermal aging time (0, 15 and 30 days) on the mechanical
properties of polyethylene composites were investigated. Nutshell powder, in four different concentrations (5, 10, 15 and 20 wt %) were
added to HDPE to produce composites. The tensile, Izod impact, hardness, density tests were conducted on specimens produced by means
of injection molding method. It was observed that, increasing the hutshell powder content in HDPE, values for elasticity modulus, yield
strength, tensile strength at break, % elongation, density, hardness and Izod impact strength decreased. On the other hand, mechanical
properties (except % elongation) of HDPE/nutshell powder polymer composites increased as the thermal aging time increases from 0 days
to 30 days.

Keywords

high density polyethylene, hazel nutshell, powder, mechanical properties.

Project Number

FEN-C-YLP-100719-0252

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