engleski

Characterization of recycled PVC/PP blend containing surface modified nanofiller

Polymeric waste generated in the processing of coverings made of soft poly (vinyl chloride) (PVC) reinforced with polypropilene (PP) fibres is rather hard to recycle due to the incompatibility of PVC and PP. To enhance the interphase properties of those polymers the commercially CaCO3 filler was partially replaced with precipitated and surface modified CaCO3 (nanofiller). The samples were prepared on laboratory roller mill in the sheet form in a way that the polymeric waste was added to the virgin PVC formulation. Morphology of such blends was monitored using SEM and followed by EDAX analysis. Microphotographs show distinction between organic (PVC) matrix and inorganic filler, only. Surface free energy was determined by contact angle measurements and shows that the PP from waste has no significant effect on the total surface free energy. On the other hand, surface modified filler reduces total surface free energy due to the low surface free energy of the filler. According to the DSC measurements crystallinity degree of PP in the blends were reduced. Perhaps the crystallization of PP is partially disabled due to its low content. Thermal degradation in air was performed thermogravimetrically up to the 650°C. TG curves differ only in the number of degradation steps as well as in the residual mass.

recycling; nano-fillers; compatibilization

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