Rachana Bhatt - PHA-rubber blends: Synthesis, characterization and biodegradation

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      Publication Details (including relevant citation   information):

      Bioresour.   Technol. 2008

        Rachana Bhatt - Google Scholar Citations


        Medium chain length polyhydroxyalkanoates (mcl-PHA) and different   rubbers; namely natural rubber, nitrile rubber and butadiene   rubber were blended at room temperature using solution blending   technique. Blends constituted 5%, 10% and 15% of mcl-PHA in   different rubbers. Thermogravimetric analysis of mcl-PHA showed   the melting temperature of the polymer around 50 degrees C.   Thermal properties of the synthesized blend were studied by   Differential Scanning Calorimetry which confirmed effective   blending between the polymers. Blending of mcl-PHA with natural   rubber led to the synthesis of a different polymer having the   melting point of 90 degrees C. Degradation studies of the blends   were carried out using a soil isolate, Pseudomonas sp. 202 for 30   days. Extracellular protein concentration as well as OD660 due to   the growth of Pseudomonas sp. 202 was studied. The degradation of   blended plastic material, as evidenced by % weight loss after   degradation and increase in the growth of organism correlated   with the amount of mcl-PHA present in the sample. Growth of   Pseudomonas sp. 202 resulted in 14.63%, 16.12% and 3.84% weight   loss of PHA:rubber blends (natural, nitrile and butadiene   rubber). Scanning electron microscopic studies after 30 days of   incubation further confirmed biodegradation of the films.

      Address (URL): http://www.sciencedirect.com/science/article/pii/S0960852407005810