Properties of biocomposites produced with polypropylene and willow (Salix babylonica L.) wood/bark

Year 2023, , 134 - 145, 29.12.2023

Seyyed Khalil Hosseinihashemi , Ayoub Eshghi , Younes Shirmohammadli

https://doi.org/10.33725/mamad.1382624

Abstract

The present study investigates the influence of various components of wood-plastic composites (WPCs) namely wood (W), inner bark (IB), outer bark (OB), and their varied percentage mixture on the mechanical behaviour. To achieve this goal, willow W, IB and OB flours were used as reinforcements at different weight percentages (17%, 27%, and 40%) in combination with polypropylene (PP) at varying weight percentages (44%, 58%, and 64%) along with a 2% compatibilizer. These constituents were processed in a twin-screw extruder with each treatment having a distinct mass proportion of reinforcement to polypropylene. Subsequently, test samples were fabricated using an injection molding machine from the obtained pellets. The mechanical properties of the resulting biocomposites were evaluated in accordance with ASTM standards. It was observed that, the flexural and tensile characteristics of the WPCs improved by the increasing inner bark content. Based on the findings of this investigation, a formulation comprising 27% wood, 27% inner bark, 44% polypropylene and 2% compatibilizing agent (W/IB/PP/MAPP) can be recommended where high mechanical properties are required. However, the other reinforced biocomposites exhibited notably lower notched impact strength compared to pure polypropylene.

Keywords

Willow wood and bark, mechanical properties, biocomposites, polypropylene

Polipropilen ve söğüt (Salix babylonica L.) odunu/kabuğu ile üretilen biyokompozitlerin özellikleri

Abstract

Bu çalışmada, odun-plastik kompozitlerin OPK'lar) çeşitli bileşenlerinin, yani odun (O), iç kabuk (İK), dış kabuğun (DK) ve bunların çeşitli yüzdelerdeki karışımlarının mekanik davranış üzerindeki etkisi araştırıldı. Bu amaç için, farklı ağırlık yüzdelerinde (17%, 27% ve 40%) söğüt O, İK ve DK unları, değişen ağırlık yüzdelerinde (44%, 58%, 40%) ve 64%, ayrıca 2%'lik bir bağdaştırıcı ve polipropilen (PP) ile kombinasyon halinde takviye olarak kullanıldı. Bu bileşenler çift vidalı bir ekstrüderde işlendi; her işlemde polipropilene göre farklı bir kütlesel takviye oranı vardı. Daha sonra, elde edilen peletlerden bir enjeksiyon kalıplama makinesi kullanılarak test numuneleri üretildi. Elde edilen biyokompozitlerin mekanik özellikleri ASTM standartlarına uygun olarak değerlendirildi. İç kabuk içeriğinin artmasıyla OPK’larıneğilme ve çekme özelliklerinin arttığı gözlemlendi. Bu araştırmanın bulgularına dayanarak, yüksek mekanik özelliklerin gerekli olduğu durumlarda 27% odun, 27% iç kabuk, 44% polipropilen ve 2% uyumlaştırıcı madde (O/İK/PP/MAPP) içeren bir formülasyon önerilebilir. Bununla birlikte, diğer güçlendirilmiş biyokompozitler, saf polipropilenle karşılaştırıldığında belirgin şekilde daha düşük çentikli darbe dayanımı sergiledi.

Keywords

Söğüt ağacı ve kabuğu, mekanik özellikler, biyokompozitler, polipropilen

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