Wydział Technologii Materiałowych i Wzornictwa Tekstyliów / Faculty of Material Technologies and Textile Design / W4
Stały URI zbioruhttp://hdl.handle.net/11652/4
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Pozycja Accelerated hydrolysis of PLA fibers at low temperature(Wydawnictwo Politechniki Łódzkiej, 2022) Tarbuk, Anita; Čorak, Ivana; Đorđević, Dragan; Draczyński, ZbigniewThe polylactide (PLA) is the most common biodegradable material. However, its biodegradation requires hydrolysis of PLA to oligomers or monomers before microbes can act. Hydrolytic degradation of PLA depends on temperature, time and relative humidity. It takes months and years until complete biodegradation. If a catalyst is introduced, i.e. alkali or alcohol, it can be done in weeks. In this article, the alkaline hydrolysis was performed at low temperatures 40-60°C without and with the addition of cationic compound as an accelerator for the purpose of saving energy and time for complete PLA degradation. It has been shown that complete degradation can be achieved in only 10 min at 40°C.Pozycja In-Compost Biodegradation of PLA Nonwovens(Instytut Biopolimerów i Włókien Chemicznych (IBWCh) , Łódź, Polska, 2014) Gutowska, Agnieszka; Jóźwicka, Jolanta; Sobczak, Serafina; Tomaszewski, Wacław; Sulak, Konrad; Miros, Patrycja; Owczarek, Monika; Szalczyńska, Magdalena; Ciechańska, Danuta; Krucińska, IzabellaPresented in this work are the results of an investigation into the biodegradation of selected nonwoven materials made of commercial poly[(DL)-lactide] – PLA 6252D supplied by Nature Works® LLC, USA. The biodegradation was examined under laboratory conditions, simulating composting by the mass-loss method at constant process parameters: temperature t = 58 ± 2 °C, pH 7 and inoculum humidity W = 52.6%. The nonwovens examined, with a surface density of about 60 g/m2, revealed a varied crystallinity degree in the range of 10.4 - 35.6% and fibre diameter of 8.2 - 10.9 μm. The nonwovens were formed by the spun-bond method from a melt at 211 - 213 °C on a laboratory stand. The commercial PLA 6252D was also examined. The polymer PLA 6252D and nonwoven materials made thereof are entirely biodegradable in the research environment applied, and after 16 weeks of biodegradation weight loss in the materials reaches 100%.