Lactose-filled composites of metallocene linear low-density polyethylene and their degradation in the composting environment

Lactose (L) filled (0-40 wt.%) composites of metallocene linear low-density polyethylene (mLLDPE) were prepared to get a new, environmentally friendly polymeric material. The effect of L on the material was characterized through its mechanical, physico-chemical and rheological properties, and biodegradability in the composting environment (up to 4 months). The microorganisms present in the compost bed have shown great influence on the properties of the new material, as proved by the weight loss data, changes in FTIR-ATR spectra, tensile and rheological properties.The presence of L in the system does not influence tensile properties significantly up to the content of 40 wt.%. The biodegradation of the highest-filled composite has been found substantially higher than that of the others. This is in agreement with the results obtained through surface morphology study by SEM and assessing the presence of microbes in the compost bed where the composites were placed for biodegradation.