PHA–rubber blends: Synthesis, characterization and biodegradation

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...

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Bibliographic Details
Published in:Bioresource technology 2008-07, Vol.99 (11), p.4615-4620
Main Authors: Bhatt, Rachana, Shah, Dishma, Patel, K.C., Trivedi, Ujjval
Format: Article
Language:English
Subjects:
Bacterial Proteins - metabolism
Biodegradation
Biodegradation, Environmental
Biological and medical sciences
Biotechnology
Calorimetry
Coconut Oil
Comamonas testosteroni
Comamonas testosteroni - metabolism
DSC
Fundamental and applied biological sciences. Psychology
PHA:rubber blends
Plant Oils - metabolism
Polyhydroxyalkanoates - biosynthesis
Polyhydroxyalkanoates - isolation & purification
Pseudomonas
Pseudomonas - growth & development
Rubber - chemical synthesis
TGA
Thermogravimetry
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Summary: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 °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 °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 OD 660 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.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2007.06.054