The influence of coupling agents on mechanical properties of lignin-filled polypropylene composites

Abstract

Natural fiber filled/reinforced composite materials are heavily studied in the academy and industry. Lignin is both a natural filling material and a side product of cellulosic bioethanol and paper industries. Lignin has been used as a filling/reinforcing material for twenty years in order to create value-added products. In this study, 10 % wt. soda lignin reinforced polypropylene composites with and without coupling agents was produced by using twin-screw extruder in order to investigate the effect of coupling agent type and the effect of coupling agent content (0.1 %, 0.3 %, and 0.5 % wt.). Mechanical, thermal and morphological properties of the composites were investigated. The results showed that the optimum amount of coupling agents in composites was 0.3% for the best interaction with lignin and polymer. According to TGA analysis, it can be concluded that lignin filled composite is more stable compared to neat copolymer.

Keywords

• Lignin,Polypropylene,Mechanical properties,Thermal properties

Lignin polipropilen kompozitlerinde ara yüzey kimyasallarının mukavemete etkisi

Abstract

Doğal elyaf ile takviye edilen kompozit malzemeler akademide ve endüstride yoğun çalışılan bir konudur. Lignin doğal bir dolgu maddesi olarak kullanılmasının yanı sıra selüloz esaslı biyoetanol ve kağıt endüstrilerinin de yan ürünüdür. Lignin çok farklı uygulamalarda 20 yıla yakındır kullanılmaktadır. Bu çalışmada soda lignin ve polipropilen kompozitleri çift vidalı polimer işleme makinasında karıştırılmıştır ve 2 farklı ara yüzey ajanı da % 0.1, % 0.3 ve % 0.5 oranlarında karıştırılmıştır. Mekanik özellikler, ısıl özellikler ve morfolojik etkileri incelenmiştir. Sonuçlar göstermiştir ki en iyi sonuçlar % 0.3 yüzey kimyasal oranı ile yapılmıştır. Termogravimetrik analizler lignin katkılı polipropilen kompozitlerinin ısıl kararlılığının daha yüksek olduğunu göstermiştir.

Keywords

• Lignin,Polipropilen,Mekanik özellikler,Isıl özellikler

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