Poliuretanas: caracterização, avaliação estrutural e efeito induzido pela radiação gama

Lage, Laércio Gomes

doi:10.11606/t.46.2018.tde-28032018-113201

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…The ionizing radiation has two mechanisms of action, one being of direct effect on the molecules of the microorganisms, breaking, injuring and fusing the structures; the other effect is the indirect one that is caused by the formation of free radicals with the water radiolysis, in which they interact with the molecules in a chain reaction culminating in the death of microorganisms 13 .…”

Section: Introductionmentioning

confidence: 99%

Study of the interaction of ionizing radiation in polyurethane polymer films as biomaterial

Massei

Matos²,

Machado

et al. 2021

IJAMB

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New materials are being studied and widely applied in the health area, highlighting biocompatible polymers as the most versatile. Among these polymers, we developed the methodology for the manufacture of Thermoplastic Polyurethane films for application as Biomaterials. The proposed sterilization by ionizing radiation requires the study and characterization of the material to evaluate possible losses or modifications, due to the influence that the radiation can cause in the polymer chains, losing the characteristics for the purpose used. Therefore, the present work evaluates, through chemical and physical-chemical characterization, the possible extension of the changes caused by the radiation in the polyurethane film. The material is produced in an environment with controlled temperature and humidity and subjected to increasing doses of gamma (15, 25 and 50 kGy), ethylene oxide and plasma as comparative techniques. The techniques DSC (Differential Scanning Calorimetry), TGA (Thermogravimetry), FTIR-ATR (Fourier Transform Infrared Spectrometry), SEM (Scanning electron microscopy) and OCT (Optical coherence tomography), have proved that the material, after applied the sterilization techniques, maintains its physical-chemical characteristics and does not suffer any modifications after the treatment.

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Section: Introductionmentioning

confidence: 99%

Study of the interaction of ionizing radiation in polyurethane polymer films as biomaterial

Massei

Matos²,

Machado

et al. 2021

IJAMB

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“…A A banda intensa de absorção em 1743,9 cm -1 foi atribuída à deformação axial da ligação C=O. A banda de absorção em 1054,9 cm -1 foi atribuída a deformação axial de C⎯O e a de 1016,6 cm -1 à deformação axial assimétrica C⎯O⎯C [51].…”

Section: Barras Desenvolvidas De Poliuretana E De Poliuretana Com Carunclassified

“…A banda de absorção em 1222,9 cm -1 foi atribuída à ligação C⎯N e a de 725,2 cm -1 foi atribuída à deformação angular da ligação N⎯H [51]. Além das barras desenvolvidas com as fases citadas anteriormente, produziu-se novos tipos de barras, utilizando PDMS moficado com 30% de pirrol, 50% de DEGS e 50% de Silar 10C; entretanto nenhuma apresentou boa recuperação dos analitos.…”

Section: Barras Desenvolvidas De Poliuretana E De Poliuretana Com Carunclassified

Desenvolvimento, avaliação e aplicações de novas fases para extração por sorção em barra de agitação (SBSE)

Nogueira¹

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The development of different kinds of bars for stir bar sorptive extraction (SBSE) was described in this work. This technique has been applied for the extraction of organic compounds from aqueous matrices due to their sorption on the stir bar. Stir bars are composed of a magneto inserted into a glass tube and coated with a polydimethylsiloxane (PDMS) layer. SBSE presents many advantages over the conventional extraction techniques such as, solventless sample preparation, simple analytical instrumentation, reuse of stir bars and mainly the higher volume of coating when compared to solid phase microextraction. The bars have been developed with more selective phases, once the unique commercially available bar presents the disadvantage of being coated solely with PDMS polymer. The home-made stir bars were prepared using PDMS modified with different materials, often used in gas chromatography columns. The goal of this modification was to increase coating polarity and to improve efficiency and selectivity of the extraction for polar compounds. The developed bars were applied to the analysis of anticonvulsivant and antidepressant in human plasma and anthelmintic in bovine plasma. In all applications, the home-made bars showed better selectivity when compared to commercial bars. An interface for coupling SBSE to HPLC developed at Laboratory of Chromatography was also evaluated for antidepressant analysis in human plasma. This coupling presented satisfactory results, being desorption more efficient when high temperatures was used. Temperature increases affinity between analytes and desorption solvent.

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Poliuretanas: caracterização, avaliação estrutural e efeito induzido pela radiação gama

Abstract: exemplo de ser humano a ser seguido, com quem tive o prazer de trabalhar. Aos professores deste Instituto, em especial pelo agradável convívio com os professores do Laboratório de Espectroscopia Molecular (LEM):

Cited by 2 publications

References 3 publications

Study of the interaction of ionizing radiation in polyurethane polymer films as biomaterial

Study of the interaction of ionizing radiation in polyurethane polymer films as biomaterial

Desenvolvimento, avaliação e aplicações de novas fases para extração por sorção em barra de agitação (SBSE)

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