title: Combined photothermal lens and photothermal mirror characterization of polymers.
abstract: We propose a combined thermal lens and thermal mirror method as concurrent photothermal techniques for the physical characterization of polymers. This combined method is used to investigate polymers as a function of temperature from room temperature up to 170 °C. The method permits a direct determination of thermal diffusivity and thermal conductivity. Additional measurements of specific heat, linear thermal expansion, and temperature-dependent optical path change are also performed. A complete set of thermal, optical, and mechanical properties of polycarbonate and poly (methyl methacrylate) samples are obtained. Methods presented here can be useful for in situ characterization of semitransparent materials, where fast and non-contacting measurements are required.
authors.affiliation: Departamento de Física, Universidade Estadual de Maringá, Maringá, PR 87020-900 Brazil.
authors.forename: Odon S
authors.initials: OS
authors.lastname: Aréstegui
authors.forename: Patricia Y N
authors.initials: PY
authors.lastname: Poma
authors.forename: Leandro S
authors.initials: LS
authors.lastname: Herculano
authors.forename: Gustavo V B
authors.initials: GV
authors.lastname: Lukasievicz
authors.forename: Francine B
authors.initials: FB
authors.lastname: Guimarães
authors.forename: Luis C
authors.initials: LC
authors.lastname: Malacarne
authors.forename: Mauro L
authors.initials: ML
authors.lastname: Baesso
authors.forename: Stephen E
authors.initials: SE
authors.lastname: Bialkowski
authors.forename: Nelson G C
authors.initials: NG
authors.lastname: Astrath