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Thermoanalytical study of polyurethane, subjected to ionizing radiation, as raw material for catheters for clinical practice

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Abstract

The present work aimed to study the thermal behavior of commercial polyurethane catheters before and after irradiation, in order to characterize the polymeric material of these catheters. Fourier transform infrared spectroscopy (FTIR) enabled the identification of functional groups in the structure of macromolecules, such as poly(esterurethane) and poly(etherurethane) in catheters of various origins, and it was confirmed that is a poly(etherurethane) sample. DSC and TG were employed to observe the changes in the properties of the material before and after degradation. DSC curve at the constant heating and cooling rate allowed the characterization of thermal properties, such as T m and T g of copolymers, as well as highlighting the main thermal events. TG provided T onset and T peak DTG, where it was possible to evaluate the thermal degradation and the mass loss of the polymer, resulting from a physical transformation such as evaporation or chemical as degradation, in a continuous process as a function of temperature. The comparative assessment conducted between the catheters before and after irradiation by FTIR, Raman and DSC enabled the use of radiation as agent of sterilization.

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Acknowledgements

The authors thank FAPESP, CNPq and CAPES and the collaboration of doctors students, Fabiana Advincula Schafer of Martini Soares of FCF-USP and Simone Garcia Davila of IQUSP in the execution of thermal analysis tests.

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Authors and Affiliations

  1. Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN/SP, Centro da Tecnologia das Radiações – CTR, Av. Prof. Lineu Prestes, 2242 Cidade Universitária, Sao Paulo, SP, Brazil

    Sonia Heilman & Leonardo Gondim de Andrade e Silva

  2. Universidade de São Paulo/Instituto de Química Laboratório de Análise Térmica Prof. Dr. Ivo Giolito (LATIG), Av. Prof. Lineu Prestes, 748 Cidade Universitária, Sao Paulo, SP, Brazil

    Jivaldo do Rosário Matos

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  1. Sonia Heilman
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  2. Jivaldo do Rosário Matos
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  3. Leonardo Gondim de Andrade e Silva
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Correspondence to Sonia Heilman.

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Heilman, S., do Rosário Matos, J. & de Andrade e Silva, L.G. Thermoanalytical study of polyurethane, subjected to ionizing radiation, as raw material for catheters for clinical practice. J Therm Anal Calorim 127, 2353–2358 (2017). https://doi.org/10.1007/s10973-016-5822-y

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  • DOI: https://doi.org/10.1007/s10973-016-5822-y

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