B. Yeşim BÜYÜKAKINCI, Nihal SÖKMEN, Haluk KÜÇÜK

DOĞAL ELYAF KARIŞIMLI POLİÜRETAN KOMPOZİTLERİN SES VE ISI YALITIM ÖZELLİKLERİNİN İNCELENMESİ

Bir kompozitin ses yutum ve ısı yalıtım özelliklerini iyileştirmek amacıyla poliüretan esaslı bir matrise doğal pamuk, bambu ve yün elyaf katılmıştır. Bu çalışmanın arkasındaki hedeflerden biri de tekstil atıklarının değerlendirilmesi ve malzeme üretiminde daha az poliüretan kullanılmasıdır. Genel olarak bakıldığında, doğal elyaf ilavesi, poliüretan köpüğün ses yalıtım özelliğini iyileştirmektedir. Yapılan deneylerde, pamuk elyaf destekli poliüretan kompozitin en iyi ses yutum katsayısı değerlerini verdiği gözlenmiştir. Poliüretan köpüğe katılan bambu ve yün elyaf oranlarının arttırılması, kompozitin yüksek frekanslardaki ses yutum katsayı değerlerini azaltmaktadır. Poliüretan köpük içerisine pamuk, bambu veya yün elyaf katılması ısıl özelliklerde kayda değer bir değişim oluşturmamaktadır. En iyi ısıl iletkenlik özelliği %4 pamuk elyaf içeren kompozit için gözlenmiştir

Anahtar Kelimeler:

Poliüretan, Ses yalıtımı, Isıl özellikler, Kompozit, Doğal elyaf

THERMAL CONDUCTIVITY AND ACOUSTIC PROPERTIES OF NATURAL FIBER MIXED POLYURETHANE COMPOSITES

Natural cotton, bamboo and wool fibers were used as reinforcement agents in a polyurethane-based matrix to improve the sound absorption and thermal conductivity properties of the composite. Generally, adding cotton, bamboo or wool fibers to polyurethane foam, improves its sound absorption coefficient. In this study, cotton fibers were observed to provide the best sound absorption coefficient. At higher frequencies, increasing the bamboo or wool fiber content decreases the sound absorption coefficient for the composite. Adding cotton, wool or bamboo fibers to polyurethane foam does not result in a significant change in the thermal conductivity of the material. The best thermal conductivity value was observed with a composite including 4% cotton fiber

Keywords:

Polyurethane, Sound absorption, Thermal properties, Composites, Natural fiber,

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