Thesis supervisor: Alec B. Scranton. Includes bibliographic references (p. 93-96).

Orientador: Lucia Helena Innocentini Mei / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica / Made available in DSpace on 2018-08-14T08:41:32Z (GMT). No. of bitstreams: 1 Barbosa_ValeriadoCarmo.pdf: 1009354 bytes, checksum: 5a59ac0da1d7f49b216506cc60cdc9e6 (MD5) Previous issue date: 2008 / Resumo: Vernizes obtidos por tecnologia de cura ultravioleta têm um grande campo de aplicação em revestimentos para madeira, sendo por isto bastante usada na Indústria Moveleira. Além disto, esta tecnologia é hoje importante do ponto de vista ambiental por ser considerada uma tecnologia limpa, já que sua formulação é livre de solvente, sendo considerada zero VOC [1, 2]. Sendo assim, esta tecnologia tem sofrido um grande avanço tecnológico, com o propósito de garantir revestimentos cada vez mais nobres e de melhor qualidade. Para isto buscam-se um aprimoramento das matérias-primas utilizadas nestas formulações, os oligômeros, monômeros e fotos-iniciadores. Além de matérias-primas, também processos de cura adequados são necessários para obter a excelência em acabamentos com tecnologia ultravioleta. Sendo assim este trabalho mostra a técnica de infravermelho, FT-IR, como uma poderosa ferramenta para avaliar e quantificar processos de cura para tecnologia ultravioleta [3]. / Abstract: Coatings that use technology of ultraviolet radiation (UV) cure have a big applicaton Field in wood recovering and are widely used in the furnitire industry. Besides that from the environmental point of view this technology is very important nowadays and the main reason is that the UV coatings formulations are free of solvent and considered zero VOC [1, 2]. Because of it, this technology has been having a great addvence, with the purpose of garantee films more and more noble and of higher quality. For this the raw mterials present in these formulations, the oligomers, monomers and photoinitiatos, are constantly being improved. Besides the raw materials, adequate cure process are necessary to obtain the best results in this technology. This work shows the infrared technic, FT-IR, as a powerful tool to evaluate and quantify the UV curing process[3]. / Universidade Estadual de Campi / Ciencia e Tecnologia de Materiais / Mestre em Engenharia Química

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Thesis (Ph. D.)--Chemical and Biomolecular Engineering, Georgia Institute of Technology, 2008. / Committee Chair: Dr. Victor Breedveld; Committee Member: Dr. Clifford Henderson; Committee Member: Dr. David Rosen; Committee Member: Dr. Peter Ludovice; Committee Member: Dr. Sai Kumar.

Thesis (Ph. D.)--University of Texas at Austin, 2003. / Vita. Includes bibliographical references. Available also from UMI Company.

Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2010. / Committee Chair: Das, Suman; Committee Member: Halloran, John; Committee Member: Henderson, Clifford; Committee Member: Kalaitzidou, Kyriaki. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Thesis (Ph. D.)--University of Texas at Austin, 2005. / Supervisor: C. Grant Willson. Vita. Includes bibliographical references.

Thesis (Ph. D.)--University of Iowa, 2007. / Supervisors: Alec B. Scranton, Chris N. Coretsopoulos. Includes bibliographical references (leaves 132-138).

L’objectif est d’étudier les propriétés optiques de formulations composites et leur évolution durant leur photopolymérisation. Une attention particulière est portée au phénomène de diffusion de la lumière engendré par la présence de charges d’indice de réfraction différent de celui de la matrice organique. Des relations indice-conversion sont établies pour des systèmes non chargés à partir des suivis cinétiques de l’évolution de l’indice de réfraction par réfractométrie et de la conversion par spectrométrie IR réalisés pour différentes compositions, température et intensité du rayonnement. L’étude des formulations chargées montre que la diffusion de la lumière est d’autant moins marquée que l’écart d’indice de réfraction entre charges et matrice est faible et la taille des particules est grande. Une modélisation basée sur un modèle à 4 flux décrivant l’évolution du rayonnement dans l’épaisseur de l’échantillon permet d’optimiser le mode opératoire le plus adapté au matériau visé. / The aim of this work is to study optical properties of loaded formulations and their variation during photopolymerization. This study is accentuated on light scattering phenomenon which is caused by presence of fillers having refractive index different from that of the organic matrix. Using real time monitoring of photopolymerization kinetics by IR spectroscopy and by refractometry, refractive index-conversion relationships are determined for unloaded systems of different compositions and at different temperatures and radiation intensities. Studying loaded formulations shows that light scattering is even less so pronounced as the difference in refractive index between fillers and matrix is lower and as the particle size is larger. Modeling based on four-flux theory was used to describe radiation evolution in terms of sample thickness in order to optimize the most appropriate operating procedure of the desired material.