Contributions to the study of the photostability of dyes in polymers

• Grant number: 05/03692-4
• Support Opportunities: Regular Research Grants
• Start date: December 01, 2006
• End date: February 28, 2010
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Organic Chemistry
• Principal Investigator: Carla Cristina Schmitt Cavalheiro
• Grantee: Carla Cristina Schmitt Cavalheiro
• Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

Considering the economical importance of the photodegradation of polymers and the stabilization of this kind of material in same cases and the acceleration of the degradation process promoted by the presence of dyes, the main goal of the present proposal is to investigate the photodegradation of dyes contained in polymeric matrixes. The importance of these studies are related with the evaluation of the efficiency of the dye as a photoprotector and its own photostability since the dye can be decomposed by the light causing the discoloration of the material or in extreme cases the polymer degradation.Such studies will be performed using spectrophotometric techniques, laser flash photolysis, among others. The photodegradation products will be characterized in order to establish the photodegradation mechanisms.The interaction of other photostabilizers, usually used in polymeric formulations with the dyes, as well as their effects in the photolysis of the dyes will also be investigated, using the techn iques described above. The experiments will be performed in the laboratories of the Grupo de Fotoquímica - IQSC/USP, which have large experience in this kind of work. (AU)

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

NEUMANN, MIGUEL G.; SCHMITT, CARLA C.; POLI, ALESSANDRA L.; NETTO-FERREIRA, JOSE CARLOS; OSAJIMA, JOSY A.. Photooxidative degradation of QTX (a thioxanthone derivative). Journal of the Brazilian Chemical Society, v. 22, n. 2, p. 217-222, FEB 2011. (05/03692-4, 07/08515-9)

LETICIA F. A. PINTO; ISABEL C. RIGOLI; MIGUEL G. NEUMANN; CARLA C. S. CAVALHEIRO. Curing, monomer leaching and water sorption of TEGDMA/BisGMA photopolymerized copolymers. Journal of the Brazilian Chemical Society, v. 24, n. 4, p. 595-600, 2013-04-00. (07/08515-9, 05/03692-4)

NEUMANN, MIGUEL G.; SCHMITT, CARLA C.; GOI, BEATRIZ E.. Thioxanthone Sensitized Photodegradation of Poly(alkyl methacrylate) Films. Journal of Applied Polymer Science, v. 115, n. 3, p. 1283-1288, FEB 5 2010. (03/07770-4, 05/03692-4)

BATISTA, TATIANA; CHIORCEA-PAQUIM, ANA-MARIA; OLIVEIRA BRETT, ANA MARIA; SCHMITT, CARLA C.; NEUMANN, MIGUEL G.. Laponite RD/polystyrenesulfonate nanocomposites obtained by photopolymerization. APPLIED CLAY SCIENCE, v. 53, n. 1, p. 27-32, JUL 2011. (07/08515-9, 05/03692-4)