Impact of Microorganisms on Mechanical Properties Changes of Composite Materials with Sawdust as Organic Filler


Abstract

The beginning of the XXIst century is characterized by rapid development of polymer materials, including polymer composite materials, which consist of a natural organic filler (wood flour, sawdust, cellulose fiber, flax fiber, sisal fiber) and reinforcement carrier (polymer). In case of that kind of the fillers under the influence of weathering (humidity, temperature) they might be subject to biodegradation due to effect of microorganisms, including funguses, which are responsible for degradation of natural organic fillers. In case of the low melting temperature polymers (e.g. PE-LD) the processing temperature does not entirely eliminate some of the fungal spores. The paper has presented the research results of twelve months. The development of the microorganisms in the natural conditions was examined in a pure filler (sawdust) as well as in a composite. Simultaneously, change of one of the fundamental strength properties, which is the impact strength, was being tested. For the investigated composite the PE-LD as the matrix and a sawdust mixture of pine, larch and oak were used. The sawdust formed the composite in 30% vol. The research results confirmed that in the natural conditions the microorganisms development depends on weathering which varies in the time of the year. The value of the V notch impact strength changed from 12.5 kJ/m2 for the composite in initial phase to the value of 6.7 kJ/m2 after twelve months operation, which is close to 54%.


Keywords:

polymer, composite, organic filler, microorganisms, impact strength, polyethylene

Barton J. 2014. Polymer composites, biocomposites and nanocomposites. Obtaining, composition, properties and fields of application. Chemik, 68(4): 280-287.   Google Scholar

Garbarczyk J., Paukszta D., Borysiak S. 2009. Thermoplastic polymer composites with lignocellulosic materials. Mechanics, 106(1-M): 93-97.   Google Scholar

Koszkul J. 1999. Polymer Materials. Wydawnictwo Politechniki Częstochowskiej, Częstochowa.   Google Scholar

Mańka M. 2011. Forest Trees Diseases. Powszechne Wydawnictwo Rolnicze i Leśne, Warszawa.   Google Scholar

Miedzianowska J., Masłowski M., Strzelec K. 2018. The natural fiber reinforced polymer composites - factors affecting the mechanical performance. Technologia i Jakość Wyrobów, 63: 45-54.   Google Scholar

Postawa P., Stachowiak T., Szarek A. 2010. Research of properties of wood-polymer composite using DMTA method. Kompozyty, 10(3): 266-269.   Google Scholar

Poszytek K. 2016. Microbial cellulose utilization. Postępy Mikrobiologii, 55(2): 132-146.   Google Scholar

Download


Published
2021-03-12

Cited by

Mazur, P., & Szuszkiewicz, J. (2021). Impact of Microorganisms on Mechanical Properties Changes of Composite Materials with Sawdust as Organic Filler . Technical Sciences, 24(1), 5–11. https://doi.org/10.31648/ts.5845

Piotr Mazur 
Jarosław Szuszkiewicz 



License

Copyright (c) 2021 Jarosław Szuszkiewicz

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.