Photoacoustic monitoring of adhesive curing

Torres-Filho, Afranio; Perondi, L. F.; Miranda, L. C. M.

doi:10.1002/app.1988.070350109

Cited by 35 publications

(16 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3][4][5] The photothermal techniques are essentially based upon sensing the temperature fluctuation of a given sample due to nonradiative deexcitation processes following the absorption of modulated or pulsed light. Apart from having been extensively used in the optical and thermal characterization of a wide spectrum of materials, ranging from semiconductors 6 to glasses 7,8 and biological specimens, 9,10 a growing number of applications of these photothermal techniques have been used for investigating the different physicochemical properties of polymers, [11][12][13] as well as how the processing conditions [14][15][16][17] of these materials affect their physical properties. Despite this growing interest and the importance of the applications of these techniques to the polymer research area, so far the photothermal measurements have been carried out mostly at near room-temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

Thermal lens scanning of the glass transition in polymers

Rohling

Caldeira

Pereira

et al. 2001

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

In this article we discuss the use of the thermal lens technique for investigating the thermal properties of polymers as a function of temperature. It is also discussed how the experimentally determined thermal lens parameters can be used to locate the glass transition in polymers. The methodology is tested using a solution casted films of poly͑vinyl chloride͒ as a testing sample. A comparison with conventional differential scanning calorimetry data is made. It is proposed that the current transient thermal lens methodology, with minor changes in its experimental configuration, could be adapted to develop a new methodology called differential thermal lens scanning especially designed for the investigation of the phase transitions in polymers. It is shown that this new methodology could be equally used for the measurement of the thermal expansion coefficient, above and below the glass transition.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal lens scanning of the glass transition in polymers

Rohling

Caldeira

Pereira

et al. 2001

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…The values of the thermal conductivity, k, were obtained by using the results of the thermal diffusivity, ␣. As the thermal conductivity is defined as k ϭ ␣c and the density, , and the specific heat, c, can be considered as constants, 26 k is straightforwardly related to the ␣ values. The values of density 11 and specific heat 27 used for these calculations were 1.16 g/cm 3 and Values of G I can be evaluated directly from the energy, U, absorbed in a Charpy impact test by the equation 28,29 :…”

Section: Table II Experimental Values Of the Energy Absorbed At The Imentioning

confidence: 99%

Analysis of the fracture behavior of epoxy resins under impact conditions

d’Almeida

Cella

2000

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

“…In 1976, Rosencwaig and Gersho published a theoretical model for the photoacoustic signal in solid samples -the Rosencwaig-Gersho Model 1 . Since then, the photoacoustic technique has been employed in different biological and biomedical sciences [2][3][4][5][6][7][8][9] . Until now, there have been few works using the photoacoustic technique to monitor resin polymerization.…”

Section: Introductionmentioning

confidence: 99%

“…Until now, there have been few works using the photoacoustic technique to monitor resin polymerization. Torres-Filho et al 5 monitored the adhesive curing of an epoxy-based resin, through photoacoustic measurements as a function of time. Yoon and coworkers also used dynamic thermoacoustic measurements to observe the curing of epoxy resins 10, 11 .…”

Section: Introductionmentioning

confidence: 99%

Study of the degree of photoactivation of the Z250 resin by photoacoustics

Rocha

Acosta‐Avalos

Barja

et al. 2003

Lasers in Dentistry IX

View full text Add to dashboard Cite

The aim of this work was to characterize the degree of photoactivation of the Z250 resin through photoacoustics. In this technique, the signal detected is proportional to the heat produced in a sample as a consequence of light absorption. This technique has been used for more than 20 years as a work tool in diverse fields of biological and biomedical sciences. Through photoacoustic measurements, it is possible to study optical and thermal properties of samples, and to obtain information on the characteristic times involved in photoinduced processes, as the photoactivation of composed resins. After application on the surface, the Z250 resin is photoactivated by incidence of continuous light (λ = 475 ± 15 nm) coming from a photodiode. This leads to the polymerization of the resin, modifying its thermal properties. The experimental method employed in this work was the following: a) the resin was applied on an aluminum sheet placed in contact with the photoacoustic cell (front incidence); b) modulated white light was applied in the lower surface of the aluminum sheet, black-painted to increase the light absorption; c) the photothermal signal was observed. Polymerization was evaluated through the alteration of the photoacoustic signal caused by the activation of the resin promoted by the incidence of the continuous light, for different activation times. The results show that the polymerization of the resin substantially modifies the photoacoustic signal, indicating that the degree of photoactivation can be evaluated through photoacoustic measurements.

show abstract

Photoacoustic monitoring of adhesive curing

Cited by 35 publications

References 11 publications

Thermal lens scanning of the glass transition in polymers

Thermal lens scanning of the glass transition in polymers

Analysis of the fracture behavior of epoxy resins under impact conditions

Study of the degree of photoactivation of the Z250 resin by photoacoustics

Contact Info

Product

Resources

About