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Effect of waste polyethylene addition on the properties of white portland cement
Miguel A. Valenzuela,Francisco J. Jiménez,Lucía Téllez,이수완,Heberto Balmori-Ramirez 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.2
The effect of the addition of organic compounds (OC) an ordinary white Portland cement (WPC), on the properties such as compressive strength, fluidity, setting time, porosity and heat of hydration has been studied by adding 0.10-0.80 weight % of OC into the cement. The mixture of organic compounds obtained from a thermo-depolymerization of waste polyethylene (WP)and hydroxylation was composed by alcohols, alkenes and alkanes. The compressive strength was significantly dependent on the amount of OC. The highest value (45.3MPa) was found by adding 0.35 wt.% of the OC. The porosity of the modified WPC did not change in the range 0-0.4 wt.% OC, however from 0.5-0.8 wt.% OC caused a linear increase of the porosity.
Lopera Alex A.,Bezzon Vinicius D. N.,Ospina Victoria,Higuita-Castro Jorge L.,Ramirez Francisco J.,Ferraz Humberto G.,Orlando Marcos T. A.,Paucar Carlos G.,Robledo Sara M.,Garcia Claudia P. 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.1
Many efforts in the tissue engineering field have been devoted to producing biomedical devices with several physico-chemical properties that could promote an increase in the quality of therapeutic treatments. Thus, 3D printing is an efficient method which facilitates manufacturing high quality products to be used as medical devices. However, high-performance materials are required for obtaining products that are able to be 3D printed to attend the biomedical concerns. In this work, fused PLA-calcium phosphate-tobramycin-based filaments with antimicrobial properties were produced. X-ray powder diffraction, Fourier transform infrared spectroscopy and thermal analysis were performed to characterize the pure compounds as well as the composite filaments, revealing that the drug is preserved into the filaments by the implemented methodology, even after the hot extrusion procedure. The filaments and the printed pieces presented great antimicrobial effect and a controlled-release profile was also observed by the drug-release assays for the filaments produced, thereby indicating this material as a promising candidate to be used for implantable medical devices in the future.