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Photoinitiation of polymerization and degradation of polymers multicomponent

Grant number: 12/19656-0
Support type:Regular Research Grants
Duration: May 01, 2013 - April 30, 2015
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal Investigator:Carla Cristina Schmitt Cavalheiro
Grantee:Carla Cristina Schmitt Cavalheiro
Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Assoc. researchers:Miguel Guillermo Neumann

Abstract

Photoinitiated polymerization is a process widely used in various practical applications, among which we can mention its use in dentistry (fillings and sealants), paints (drying and curing), and photomicrolithography (plates and printed circuits). In most of cases these works are developed in overall shape, and changes in formulations or procedures for obtaining specific characteristics of the polymers are empirically made. In our work we try to determine the fundamental physical and chemical parameters of elementary reactions involved in global processes to determine the overall polymerization mechanisms, to correlate well with the properties of materials and the polymerization conditions.Thus we are proposing to continue this type of studies with special emphasis on the elementary reactions that occur in the initiation of photopolymerization due to new initiators or mixtures in photopolymerization in the presence of microparticles. In all cases, the objective is the determination of the global mechanisms of polymerization reactions as a function of the rates of individual elementary processes. Likewise, the yields are determined for global polymerization and correlated with the stages of the photochemical quantum yields.On the other hand, physical and chemical properties of the polymers obtained will be studied and its dependence on the conditions of the polymerizations, through the influences of the polymerization rates in the structure of the materials.Meanwhile, processes that could lead to polymer degradation and photodegradation are being performed. These degradation studies include the studies of polymer films and solid solutions, in order to propose methodologies for degradation of polymeric materials potentially pollutants. In these cases, it is also made an approach to global mechanisms through the study of elementary processes. (AU)

Scientific publications (15)
(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)
VALANDRO, SILVANO R.; POLI, ALESSANDRA L.; NEUMANNA, MIGUEL G.; SCHMITT, CARLA C. Photochemical Synthesis of Ag and Au Nanoparticles Using a Thioxanthone Substituted Chitosan as Simultaneous Photoinitiator and Stabilizer. Journal of the Brazilian Chemical Society, v. 30, n. 12, SI, p. 2642-2648, DEC 2019. Web of Science Citations: 0.
SILVANO R. VALANDRO; ALESSANDRA L. POLI; MIGUEL G. NEUMANN; CARLA C. SCHMITT. Photochemical Synthesis of Ag and Au Nanoparticles Using a Thioxanthone Substituted Chitosan as Simultaneous Photoinitiator and Stabilizer. Journal of the Brazilian Chemical Society, v. 30, n. 12, p. 2642-2649, Dez. 2019.
MUNIZ GONZAGA, VIRGINIA DE ALENCAR; CHRISOSTOMO, BRUNO ALVIM; POLI, ALESSANDRA LIMA; SCHMITT, CARLA CRISTINA. Preparation, Characterization and Photostability of Nanocomposite Films Based on Poly(acrylic acid) and Montmorillonite. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 21, n. 4, p. -, 2018. Web of Science Citations: 0.
GONCALVES, JOYCE L. S.; VALANDRO, SILVANO R.; POLI, ALESSANDRA L.; SCHMITT, CARLA C. Influence of clay minerals on curcumin properties: Stability and singlet oxygen generation. Journal of Molecular Structure, v. 1143, p. 1-7, SEP 5 2017. Web of Science Citations: 3.
LOMBARDO, PATRICIA C.; POLI, ALESSANDRA L.; CASTRO, LUCAS F.; PERUSSI, JANICE R.; SCHMITT, CARLA C. Photochemical Deposition of Silver Nanoparticles on Clays and Exploring Their Antibacterial Activity. ACS APPLIED MATERIALS & INTERFACES, v. 8, n. 33, p. 21640-21647, AUG 24 2016. Web of Science Citations: 9.
PEDRO, RAFAEL DE OLIVEIRA; SCHMITT, CARLA C.; NEUMANN, MIGUEL G. Syntheses and characterization of amphiphilic quaternary ammonium chitosan derivatives. Carbohydrate Polymers, v. 147, p. 97-103, AUG 20 2016. Web of Science Citations: 17.
VALANDRO, SILVANO R.; POLI, ALESSANDRA L.; VENANCIO, TIAGO; PINA, JOAO; DE MELO, J. SEIXAS; BURROWS, HUGH D.; SCHMITT, CARLA C. A novel biopolymeric photoinitiator based on chitosan and thioxanthone derivative: Synthesis, characterization and efficiency in photopolymerization. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, v. 327, p. 15-20, AUG 15 2016. Web of Science Citations: 4.
FECCHIO, BRUNO D.; VALANDRO, SILVANO R.; NEUMANN, MIGUEL G.; CAVALHEIRO, CARLA C. S. Thermal Decomposition of Polymer/Montmorillonite Nanocomposites Synthesized in situ on a Clay Surface. Journal of the Brazilian Chemical Society, v. 27, n. 2, p. 278+, FEB 2016. Web of Science Citations: 2.
MARINA MARTINS TERRIN; ALESSANDRA LEVES POLI; MARCO ANTONIO HORN JR; MIGUEL GUILLERMO NEUMANN; EDER TADEU GOMES CAVALHEIRO; IVO CARLOS CORREA; CARLA CRISTINA SCHMITT. Effect of the loading of organomodified clays on the thermal and mechanical properties of a model dental resin. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 19, n. 1, p. 40-44, Fev. 2016. Web of Science Citations: 6.
MARINA MARTINS TERRIN; ALESSANDRA LEVES POLI; MARCO ANTONIO HORN JR; MIGUEL GUILLERMO NEUMANN; EDER TADEU GOMES CAVALHEIRO; IVO CARLOS CORREA; CARLA CRISTINA SCHMITT. Effect of the loading of organomodified clays on the thermal and mechanical properties of a model dental resin. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 19, n. 1, p. 40-44, Fev. 2016.
VALANDRO, SILVANO R.; POLI, ALESSANDRA L.; NEUMANN, MIGUEL G.; SCHMITT, CARLA C. Photophysics of Auramine O adsorbed on solid clays. Journal of Luminescence, v. 161, p. 209-213, MAY 2015. Web of Science Citations: 10.
SANTOS, WILLY G.; CARDOSO, DANIEL R.; ARRIVETTI, LEANDRO DE O. R.; SCHMITT, CARLA C.; NEUMANN, MIGUEL G. DFT, spectroscopic, and photoproduct study of 2-aminoethyldiphenylborinate and tetraphenyldiboroxane. JOURNAL OF ORGANOMETALLIC CHEMISTRY, v. 755, p. 125-133, APR 1 2014. Web of Science Citations: 2.
MENEGUSSI, LUKESE R.; VALANDRO, SILVANO R.; POLI, ALESSANDRA L.; SCHMITT, CARLA C.; NEUMANN, MIGUEL G. Behaviour of Pseudoisocyanine in Macromolecular and Hydrotropic Solutions. Journal of the Brazilian Chemical Society, v. 25, n. 8, p. 1455-1461, Ago. 2014. Web of Science Citations: 5.
VALANDRO, SILVANO R.; POLI, ALESSANDRA L.; NEUMANN, MIGUEL G.; SCHMITT, CARLA C. Organomontmorillonite/poly(methyl methacrylate) nanocomposites prepared by in situ photopolymerization. Effect of the organoclay on the photooxidative degradation. APPLIED CLAY SCIENCE, v. 85, p. 19-24, NOV 2013. Web of Science Citations: 7.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.