New methods for the determination of dopant site distributions and dopant rates of diffusion in polymer films: emission from pyrenyl groups covalently attached to low-density polyethylene

A low density polyethylene (LDPE) is one of the hazardous polymers accelerates land and water pollution. Standardizing the protocol for degradation of plastics in an aesthetic approach is a big task. Low density polyethylene polymer can be degraded by microbial enzymes by means of cutting down the molecular chains. Two fungal strains Aspergillus fumigus and Xylaria sp. were showing high degradable activity through the determination of pH variation and carbon di oxide estimation. Aspergillus fumigus and Xylaria sp shows pH variation in the culture media containing LDPE strips after 30 days and was recorded as 6.5 to 8.4 and 6.5 to 7.7 respectively. The efficacy of polyethylene degradation was confirmed further by CO2 estimation of culture filtrate and was recorded as 1.460 g/l in Aspergillus fumigus and 1.350 g/l in Xylaria sp. Surface erosion and the formation of pits and cavities on the surface of the LDPE strips were also observed using Scanning Electron Microscope and significant disappearance in carbonyl peak with respect to the control band absorbance (2361.61 cm-1) and increase or decrease in peak intensity with respect to control indicates structural changes in chemical bond due to degradation process.

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Characterization and determination of thermal and radioluminescence properties of low-density polyethylene (LDPE)-(nanozeolite + Y2O3) composite

Polymers and Polymer Composites ◽

10.1177/0967391119866031 ◽

2019 ◽

Vol 28 (2) ◽

pp. 112-118

Author(s):

Murat Çanlı ◽

İlker Çetin Keskin ◽

Murat Türemiş ◽

Kamil Sirin ◽

Mehmet İsmail Katı

Keyword(s):

Low Density Polyethylene ◽

Low Density ◽

X Ray Diffraction ◽

Twin Screw ◽

Nanocomposite Fibers ◽

To Come ◽

Ldpe Composites ◽

Dispersing Medium ◽

Extrusion Method

Nanotechnology has become one of the most popular areas of interdisciplinary research. In the vast majority of nanotechnology applications, polymer-based matrices were used as the dispersing medium of nanoparticles. The combination of polymer–zeolite nanocomposite has the potential to come out with the advantages of polymers and zeolites while coping with the deficiencies of both materials. In this study, the synthesis and properties of low-density polyethylene (LDPE) composites with nanozeolite + Y2O3 are investigated. Polyethylene nanocomposite fibers containing nanozeolite + Y2O3 at 5% by mass using a melt extrusion method were composed in a laboratory type twin screw extruder. The thermal properties of the composite fibers were determined by analysis of both thermal gravimetric and differential thermal spectra. Their structural properties were enlightened by scanning electron microscopy, Fourier transform infrared, and ultraviolet absorption. According to the results of X-ray diffraction tests, the samples contain crystals in semicrystalline and α form. The mechanical properties of LDPE matrices increased with the addition of nanoparticles. In addition, radioluminescence properties of the polymer were also improved after composing with nanozeolite and Y2O3.

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