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Related Experiment Videos

PHA-rubber blends: synthesis, characterization and biodegradation.

Rachana Bhatt1, Dishma Shah, K C Patel

  • 1Department of Biosciences, Sardar Patel University, Vallabh Vidyanagar 388 120, Gujarat, India.

Bioresource Technology
|September 4, 2007
PubMed
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This study blended medium chain length polyhydroxyalkanoates (mcl-PHA) with natural, nitrile, and butadiene rubbers. The resulting mcl-PHA rubber blends showed enhanced biodegradation by Pseudomonas sp. 202.

Area of Science:

  • Polymer Science
  • Materials Science
  • Environmental Science

Background:

  • Polyhydroxyalkanoates (PHAs) are biodegradable polyesters with potential applications as sustainable plastics.
  • Blending PHAs with conventional rubbers can modify their properties and enhance biodegradability.
  • Investigating the thermal properties and biodegradation of PHA-rubber blends is crucial for developing eco-friendly materials.

Purpose of the Study:

  • To synthesize and characterize blends of medium chain length polyhydroxyalkanoates (mcl-PHA) with natural, nitrile, and butadiene rubbers.
  • To evaluate the thermal properties and confirm effective blending using Differential Scanning Calorimetry (DSC).
  • To assess the biodegradability of the mcl-PHA/rubber blends using Pseudomonas sp. 202 and quantify weight loss.

Main Methods:

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  • Solution blending technique at room temperature to create mcl-PHA/rubber blends with varying mcl-PHA content (5%, 10%, 15%).
  • Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) for thermal characterization.
  • Biodegradation studies using soil isolate Pseudomonas sp. 202 for 30 days, monitoring microbial growth (OD660) and weight loss.
  • Scanning Electron Microscopy (SEM) to confirm biodegradation.

Main Results:

  • Differential Scanning Calorimetry confirmed effective blending, with mcl-PHA/natural rubber blends exhibiting a new melting point of 90°C.
  • Biodegradation studies showed a positive correlation between mcl-PHA content and the degradation rate, evidenced by increased Pseudomonas sp. 202 growth and weight loss.
  • Specific weight losses of 14.63%, 16.12%, and 3.84% were observed for mcl-PHA blends with natural, nitrile, and butadiene rubber, respectively.
  • SEM analysis visually confirmed the biodegradation of the blend films after incubation.

Conclusions:

  • mcl-PHA can be effectively blended with various rubbers, modifying their thermal properties.
  • The presence of mcl-PHA significantly enhances the biodegradability of the rubber blends by Pseudomonas sp. 202.
  • These PHA-rubber blends represent promising biodegradable materials with tunable properties for sustainable applications.