scholarly journals DSC ANALYSIS OF NOVEL POLYETHILENE BIOFILM CARRIERS

2019 ◽  
Vol 2019 ◽  
pp. 204-207
Author(s):  
Ovidiu IORDACHE ◽  
Irina SANDULACHE ◽  
Ioana Corina MOGA ◽  
Cornelia MITRAN ◽  
Lucia SECAREANU ◽  
...  
Keyword(s):  
Organic Compounds ◽  
High Density Polyethylene ◽  
High Density ◽  
Biofilm Reactor ◽  
Treated Wastewater ◽  
Dsc Analysis ◽  
Treatment Technology ◽  
Inorganic Substances ◽  
Biofilm Development ◽  
Inorganic And Organic

MBBR (Moving Bed Biofilm Reactor) wastewater treatment technology relies heavily on the type of used HDPE (High Density Polyethylene) carriers, that use immobilized biofilm for the removal of organic and inorganic substances in the treated wastewater. Present work explored DSC (Differential Scanning Calorimetry) analysis on four novel variants of HDPE carriers. DSC is a thermoanalytical technique in which the difference in the amount of heat required to increase the temperature of a sample and reference is measured as a function of temperature. The four novel carriers were composed of novel recipes of mixes of polyethylene with inorganic and organic compounds (patent pending), designed for greater microbial biofilm development. DSC analysis. DSC analysis was carried out in order to understand the behavior of the developed carriers, in various scenarios. High density polyethylene (HDPE) is a weak, semi- crystalline, thermoplastic polymer that is part of the polyolefin class. Analysis revealed that the temperatures at which the melting process of crystalline zones in the macromolecular structures occur, gradually decreases from the sample with only HDPE in composition to the one with addition of a mix of inorganic and organic compounds.

scholarly journals Effect of the surface finishing methods on particleboard volatile organic compounds and formaldehyde emission

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5450-5463 ◽  
Author(s):  
Feng Chen ◽  
Jun Shen ◽  
Xinghua Xia
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
High Density Polyethylene ◽  
Indoor Air Pollution ◽  
Formaldehyde Emission ◽  
High Density ◽  
Surface Finishing ◽  
Volatile Organic ◽  
Total Volatile Organic Compounds ◽  
Water Borne

Chemical contaminants from wood-based panels, such as volatile organic compounds (VOCs) and formaldehyde, are the main sources of indoor air pollution. The particleboards were used as the substrate and five common finishing methods, including melamine-impregnated paper, high-density polyethylene decorative film, wood veneer, polypropylene water borne paintings coatings, and polyurethane water borne paintings coatings, were selected for this study. The emission curves in the first 6 h and the equilibrium concentrations of the total volatile organic compounds (TVOC) and formaldehyde processed with the finishing wood-based panel method for 24 h were obtained and measured using an airtight environmental chamber. The ingredients of the VOCs were investigated using the small chamber method and gas chromatography and mass spectrometry (GC/MS). The results indicated that the finishing methods were effective for reducing the emissions of TVOC (except the water borne coating) and formaldehyde of the particleboards. High density polyethylene film was the best finishing material to reduce the release of TVOC. The concentration of the veneered particleboard from the third to the tenth hour was higher than the unfinished particleboards. The veneered particleboard released six volatile ingredients to a lesser extent than the unfinished particleboard.

Permeation of Selected Organic Compounds Through Untreated and Barrier-Treated High-Density Polyethylene

1990 ◽  
Vol 215 ◽  
Author(s):  
Daniel J. Kathios ◽  
Robert M. Ziff
Keyword(s):  
Organic Compounds ◽  
Aromatic Hydrocarbons ◽  
High Density Polyethylene ◽  
Permeation Rate ◽  
High Density ◽  
Chemical Characteristics ◽  
Individual Contributions ◽  
The Individual ◽  
And Diffusion

AbstractThe permeation rates of alkanes, alcohols, and aromatic hydrocarbons through untreated, fluorinated, and sulfonated high-density polyethylene (HDPE) were measured at a variety of temperatures and solvent compositions. The results were then analyzed to separate the individual contributions that solubility and diffusion make to the overall permeation rate. These results are discussed in terms of the chemical characteristics of the permeating constituents, and the barrier treatments on the HDPE surface.

Composition and Surface Topography Effects on Apatite-Forming Ability of Ceramic-Polymer Composites

2003 ◽  
Vol 774 ◽  
Author(s):  
Susan M. Rea ◽  
Serena M. Best ◽  
William Bonfield
Keyword(s):  
Surface Topography ◽  
High Density Polyethylene ◽  
High Density ◽  
Apatite Layer ◽  
Biologically Active ◽  
Human Blood Plasma ◽  
Apatite Formation ◽  
Polyethylene Matrix ◽  
Composite Surface ◽  
X Ray

AbstractHAPEXTM (40 vol% hydroxyapatite in a high-density polyethylene matrix) and AWPEX (40 vol% apatite-wollastonite glass ceramic in a high density polyethylene matrix) are composites designed to provide bioactivity and to match the mechanical properties of human cortical bone. HAPEXTM has had clinical success in middle ear and orbital implants, and there is great potential for further orthopaedic applications of these materials. However, more detailed in vitro investigations must be performed to better understand the biological interactions of the composites and so the bioactivity of each material was assessed in this study. Specifically, the effects of controlled surface topography and ceramic filler composition on apatite layer formation in acellular simulated body fluid (SBF) with ion concentration similar to those of human blood plasma were examined. Samples were prepared as 1 cm × 1 cm × 1 mm tiles with polished, roughened, or parallel-grooved surface finishes, and were incubated in 20 ml of SBF at 36.5 °C for 1, 3, 7, or 14 days. The formation of a biologically active apatite layer on the composite surface after immersion was demonstrated by thin-film x-ray diffraction (TF-XRD), environmental scanning electron microscopy (ESEM) imaging and energy dispersive x-ray (EDX) analysis. Variations in sample weight and solution pH over the period of incubation were also recorded. Significant differences were found between the two materials tested, with greater bioactivity in AWPEX than HAPEXTM overall. Results also indicate that within each material the surface topography is highly important, with rougher samples correlated to earlier apatite formation.

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