Development and Research of Polyurethane Foam Composite Materials with Albucid
Tetiana Vislohuzova,
Rita Rozhnova,
Nataliia Galatenko
Issue:
Volume 7, Issue 3, September 2021
Pages:
38-43
Received:
12 July 2021
Accepted:
23 July 2021
Published:
4 August 2021
Abstract: In modern surgery there is a need for restorative and reconstructive operations in the orbit and periorbital area as a result of eye injuries. This study is aimed at the development and research of the structure and properties of polyurethane foam (PUF) composite materials filled by antimicrobial drug substance albucid as implants for ophthalmic surgery. PUF composite materials with albucid (in the amount of 5 wt.%) based on diisocyanate prepolymer (synthesized from polyoxypropylene glycol and 2.4-; 2.6-toluylene diisocyanate) were obtained. The structure, adhesive, thermophysical and thermogravimetric properties, morphology of composite materials have been characterized using Fourier transform infrared (FTIR), mechanical tests, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and transmission optical microscopy (TOM). It is established that the immobilization of albucid occurs due to intermolecular hydrogen bonds by the method of IR spectroscopy. According to the results of physical-mechanical tests the presence of albucid in the composition of polyurethane foams does not affect the value of the adhesive strength of composite materials. According to DSC the investigated systems are single-phase with a glass transition temperature from minus 48.40 to minus 48.64°C. The introduction of albucid into the PUF causes a decrease of the specific heat capacity at the glass-transition temperature and does not affect on the Tg of composite materials. According to the results of analysis of TOM photomicrograph, it was found that the presence of albucid in the composite materials leads to a decrease in the porosity percentage, an increase in the quantity of pores with a diameter less than 300 μm, which is 82% (while for PUF it is 69.5%) and the absence of pores with a diameter more than 954 μm. Thermogravimetric characteristics indicate the heat resistance of the synthesized PUF to a temperature of 162.84°C, which makes it possible to carry out dry sterilization of samples without changing their characteristics. Therefore, the obtained PUF composite materials with albucid exhibit adhesion, heat resistance and have a microporous structure. It allows us to conclude that they are promising materials that can be used in medical practice, in particular in ophthalmic surgery as implants with antimicrobial action.
Abstract: In modern surgery there is a need for restorative and reconstructive operations in the orbit and periorbital area as a result of eye injuries. This study is aimed at the development and research of the structure and properties of polyurethane foam (PUF) composite materials filled by antimicrobial drug substance albucid as implants for ophthalmic su...
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Mixed Agro-waste Biocomposites of Low Density Polyethene; Impact of Fillers on Mechanical, Morphological, Water Imbibition and Biodegradability Properties
Marcellinus Chibuike Ogudo,
Pauline Uchechukwu Chris-Okafor,
Joy Nwando Nwokoye,
Juliana Ozioma Anekwe
Issue:
Volume 7, Issue 3, September 2021
Pages:
44-49
Received:
1 August 2021
Accepted:
12 August 2021
Published:
23 August 2021
Abstract: In retrospect, the incorporation of agricultural waste as a natural, biodegradable filler in polymer composites is a scientific innovation that has received global attention. This is due to its impact in enhancing sustainability of composites and degradation of plastics. The mechanical, morphological, water imbibition and biodegradability properties of low density polyethene produced composites were investigated using agro wastes blend of corn cobs and sugarcane bagasse. Agro waste with a particle size of 75μm was blended in a 50:50 ratio and integrated into LDPE polymer matrix at different percentages of 0%, 5%, 10%, 15%, and 20%, with composites fabricated via injection molding. The mechanical properties like the tensile strength, percentage elongation at break, compressive strength, shear modulus and hardness test of the composites were studied in line with ASTM standards. Also, the morphological properties were studied with a Scanning Electron Microscope. From the results, there was a reduction in tensile strength of the composites with increasing filler loading. However, the percentage elongation at break of the LDPE composite increased as the filler loading increased as an indication that the composite is relatively ductile. Hardness, compressive strength and shear modulus of the polymer composites increased with increasing filler loading. Morphological study of the composites showed a good adhesion and interfacial bonding between the filler and the polymer matrix due to good dispersion of the fillers in the polymer matrix. Biodegradation test revealed a reduction in the mass of the composites after a 3- month burial period which was more pronounced after a 30-day test period indicating that the composite is more environmentally friendly. The highest degradation rate was observed at 20wt% CCSB-LDPE composite giving a 15% reduction after 90days. Result from the water imbibition test indicated no increase in the mass of the composites after immersion in water. This is an indication that the composite can be utilized in wet environments. Hence, from the findings, it is suggested that agro-wastes like rice husk and sugarcane bagasse be employed as fillers in the manufacture of plastics because they are cheaper and viable. Finally, the produced plastics would degrade when discarded.
Abstract: In retrospect, the incorporation of agricultural waste as a natural, biodegradable filler in polymer composites is a scientific innovation that has received global attention. This is due to its impact in enhancing sustainability of composites and degradation of plastics. The mechanical, morphological, water imbibition and biodegradability propertie...
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