Impact of Microorganisms on Mechanical Properties Changes of Composite Materials with Sawdust as Organic Filler
Jarosław SzuszkiewiczUniversity of Warmia and Mazury in Olsztyn
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
Copyright (c) 2021 Jarosław Szuszkiewicz
This work is licensed under a Creative Commons Attribution 4.0 International License.