Biodegradation of polystyrene (PS)-poly(lactic acid) (PLA) nanocomposites using Pseudomonas aeruginosa

Shimpi, Navinchandra G.; Borane, Mahesh; Mishra, Satyendra; Kadam, M. S.

doi:10.1007/s13233-012-0026-1

Cited by 65 publications

(27 citation statements)

References 28 publications

(16 reference statements)

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“…The FTIR spectrum of OMMT shows a characteristic peak at 3616 cm −1 (Fig. (d)) that corresponds to free –OH groups and clear –CH 2 – peaks at 2920 and 2854 cm −1 , in addition to the characteristic peaks of MMT …”

Section: Resultsmentioning

confidence: 99%

“…4(d)) that corresponds to free -OH groups and clear -CH 2 -peaks at 2920 and 2854 cm −1 , in addition to the characteristic peaks of MMT. 33 Figures 4(f)-(i) show FTIR spectra of OMMT-filled Viton rubber nanocomposites, which show characteristic peaks of both OMMT and Viton rubber in addition to new peaks at 2360 and 1635 cm −1 assigned to isocyanate and conjugated C C. There is a strong interaction between the rubber chains and Diak-3, which is generated at the time of vulcanization. Moreover, with increasing OMMT loading, the peak intensity of Viton:OMMT nanocomposites increases.…”

Section: Sample Preparationmentioning

confidence: 99%

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Thermal, mechanical and morphological properties of surface‐modified montmorillonite‐reinforced Viton rubber nanocomposites

Mali

Shimpi

Mishra

2013

Polymer International

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Thermal, mechanical and morphological properties of surface‐modified montmorillonite (OMMT)‐reinforced Viton rubber nanocomposites were studied. The surface of montmorillonite was modified with a column chromatography technique using quaternary long‐chain ammonium salt as an intercalant, which resulted in uniform exchange of ions between montmorillonite and the ion‐exchange resin, and increased the d‐spacing to 31.5 Å. This improved d‐spacing was due to the use of an ion‐exchange column of sufficient length (35 cm) and diameter (5 cm) with maximum retention time for exchange of ions. The Viton nanocomposites reinforced with OMMT (3–12 wt%) were prepared using a two‐roll mill and moulded in a compression moulding machine. Tensile strength increased 3.17 times and elongation at break from 500 to 600% for 9 wt% loading of OMMT in comparison to pristine Viton rubber. Thermogravimetric analysis revealed that the presence of OMMT greatly improved the thermal stability. This improvement in properties with increasing OMMT loading was due to insertion of rubber chains between the OMMT plates with good wetting ability. Overall, at an optimum OMMT loading of 9 wt%, the properties of the Viton rubber nanocomposites improved, and subsequently worsened at 12 wt% due to agglomeration of OMMT as revealed by scanning electron microscopy and atomic force microscopy images. © 2013 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Thermal, mechanical and morphological properties of surface‐modified montmorillonite‐reinforced Viton rubber nanocomposites

Mali

Shimpi

Mishra

2013

Polymer International

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“…Montmorillonite shows a characteristic peak at 1033 cm −1 originating from SiOSi, whereas the peaks observed at 914 cm −1 and 3616 cm −1 corresponds to SiOH groups and free –OH groups, respectively. The peak at 2920 and 2854 cm −1 are for CH 2 groups in OMMT . To determine the effect of fungal attack during degradation process, PS:PLA and PS:PLA:OMMT composites were investigated using FTIR.…”

Section: Resultsmentioning

confidence: 99%

Preparation, characterization, and biodegradation of PS:PLA and PS:PLA:OMMT nanocomposites usingAspergillus niger

2013

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Poly(lactic acid) (PLA) was synthesized using l‐lactic acid by condensation polymerization. Polystyrene (PS) and surface modified montmorillonite (OMMT) was used for the preparation of PS:PLA composites and PS:PLA:OMMT nanocomposites. The composite materials prepared had varying amount of PLA (10–30%) and OMMT (0.5–5 phr). These composites were subjected to degradation in minimal medium using the fungi Aspergillus niger (A. niger) under controlled conditions. Scanning electron microscopy (SEM) showed the growth of microorganism on the polymer surface and fracture within the polymer matrix as a result of degradation. Fourier transform infra red spectroscopy (FTIR) was further used to determine the mechanism leading to biodegradation. It was found that the biodegradation of both PS:PLA and PS:PLA:OMMT took place mainly via break down and utilization of ester group, as can be seen from disappearance of absorption peak of ester group and simultaneous appearance of a typical IR absorption of microbial mass at 1450 cm−1. The thermal stability of PS:PLA:OMMT nanocomposites was found to increase with increasing concentration of OMMT, as observed from thermo gravimetric analysis (TGA), while mechanical property was found to be decreased after degradation at 30% of PLA and 5 wt% of OMMT content. Change in extracellular protein content, biomass production and % degradation with respect to time (up to 28 days) were studied and correlated to evaluate the effectiveness of A. niger in biodegradation of the composites. POLYM. COMPOS., 35:263–272, 2014. © 2013 Society of Plastics Engineers

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“…Particulate objects such as bacterial cells absorb or scatter light in proportion to their cell mass or number. An increase in the turbidity of liquid media and broths indicates an increase in the number of microbial cells capable of utilizing the test material as a sole carbon source [32] .…”

Section: Turbiditymentioning

confidence: 99%

Biodegradability Characterization of Polymer Nanocomposites

Dean¹,

Sangwan²,

Way³

et al. 2012

Characterization Techniques for Polymer Nanocomposites

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Biodegradation of polystyrene (PS)-poly(lactic acid) (PLA) nanocomposites using Pseudomonas aeruginosa

Cited by 65 publications

References 28 publications

Thermal, mechanical and morphological properties of surface‐modified montmorillonite‐reinforced Viton rubber nanocomposites

Thermal, mechanical and morphological properties of surface‐modified montmorillonite‐reinforced Viton rubber nanocomposites

Preparation, characterization, and biodegradation of PS:PLA and PS:PLA:OMMT nanocomposites usingAspergillus niger

Biodegradability Characterization of Polymer Nanocomposites

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