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In this paper, a PVC filled with a biodegradable polymer, such as polyhydroxybutyrate, was investigated. Polyhydroxybutyrate is a natural biopolymer, but its use limits its high cost. These polymeric composites were obtained by rolling. Thermal and thermomechanical properties of polymer composites based on PVC containing various amounts of polyhydroxybutyrate are studied. It has been determined by differential scanning calorimetry method that the glass transition temperature of PVC decreases with increasing percentage of polyhydroxybutyrate filling. For these composite materials, the TMA method yields flow curves, thermomechanical curves. It is determined that unfilled PVC shows a slight deformation and the smallest irreversible deformation. With an increase in the PHB content, both elastic deformation and a viscous flow increase in polymer composites, i.e. with increasing the proportion of polyhydroxybutyrate in the mixture, the elastic properties of the composite increase. Thus, in general, the addition of polyhydroxybutyrate does not significantly impair the performance properties of the resulting composite materials. [ABSTRACT FROM AUTHOR]

In the current work, a series of poly(sodium acrylate)-co-acrylamide (polyNaA-co- AAm/pectin and polyNaA-co-AAm/bentonite) superabsorbent composites were prepared using pectin, bentonite, acrylamide and acrylic acid (AA) in the presence of N,N-methylenebisacrylamide (MBAAm) as cross-linker and a mixture of ammonium persulfate and TEMED as initiator. The structure and sorption capacity of the developed composites were characterized by Fourier transform infrared spectroscopy (FTIR), voltammetry and UV-visible spectroscopy. In this paper, the sorption capacity of a series of samples of composite materials polyNaA-co-AAm/pectin and polyNaA-co- AAm/bentonite were determined and compared. Studies and the analysis of absorption processes of copper ions from aqueous solutions showed that the pectin and bentonite-containing polymer composites has high degree of affinity with of heavy metal ions. Developed pectin-containing hydrogel composite can be effectively used for removal from water solutions of toxic connections. [ABSTRACT FROM AUTHOR]

In order to reduce the negative impact of PVC on the environment, it is becoming popular to produce composite materials based on PVC filled with various natural fillers. For example, bentonite as filler in a polymer matrix can absorb volatile toxic components and accelerate the degradation of PVC. Also in this paper, natural polysaccharides pectin and starch are considered as fillers. Pectin and starch are also capable of accelerating biodegradation of PVC. Nevertheless, the thermal stability of the resulting polymer composites is also of interest. For these polymeric composites, the thermal stability was studied by thermogravimetry, the destruction mechanism was studied, and the kinetic parameters of the thermal destruction were determined. [ABSTRACT FROM AUTHOR]