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International Journal of Spectroscopy
Volume 2011 (2011), Article ID 641257, 8 pages
http://dx.doi.org/10.1155/2011/641257
Research Article

Distribution of Heat Stabilizers in Plasticized PVC-Based Biomedical Devices: Temperature and Time Effects

1Gambro Dasco S.p.A, Via Modenese 30, 41036 Modena, Italy
2Department of Chemistry, University of Modena and Reggio Emilia, Via G. Campi 183, 41125 Modena, Italy
3INSTM, UdR of Modena, 41125 Modena, Italy

Received 20 April 2011; Revised 13 June 2011; Accepted 14 June 2011

Academic Editor: Ahmed Aamouche

Copyright © 2011 Lidia Maria Bodecchi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Thermoplastic polymers can be viewed as a dynamic framework in which additives allocation is strongly dependent on the system' chemistry. Considering the complexity of the distribution phenomena that may occur in plastics obtained by blending polymeric resins with different additives, this work constitutes an attempt to the description of the behavior of PVC heat stabilizers (calcium and zinc carboxylates), as regard temperature and time. Thanks to the Fourier Transform Infrared Spectroscopy, it is possible to observe a first decreasing trend of the additives related IR-bands as a function of the increasing temperature and the higher the temperature the faster the decrease of the heat stabilizers intensities bands is, with respect to time. Additives distribution in not sterilized, sterilized, aged not sterilized and aged sterilized materials have been investigated to determine their behavior with respect to temperature, from 30 to 120°C, and time. A simulated supplementary aging process equivalent to 9 months aging was carried out on aged not sterilized and aged sterilized materials to gain more data on the transport/reaction phenomena these additives in the plastic material. Experimental evidences allow hypothesizing that reaction and redistribution phenomena probably concur to determine the additives allocation in PVC as a function of temperature and time.