Photodegradation of bisphenol A polycarbonate under blue light radiation and its effect on optical properties

Mehr, M. Yazdan; Driel, W.D. van; Jansen, K.M.B.; Deeben, P.; Boutelje, M.; Zhang, G.Q.

doi:10.1016/j.optmat.2012.10.001

Cited by 76 publications

(25 citation statements)

References 20 publications

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“…A serious problem in LED‐based lighting is the decrease of the light output over time due to the age‐related yellowing of the optical component. Various studies have shown yellowing of plastics can be caused by both UV radiation and blue light …”

Section: Introductionmentioning

confidence: 99%

Investigations on the aging behavior of transparent bioplastics for optical applications

Baltscheit

Schmidt

Schröder

et al. 2020

InfoMat

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In this study, the optical properties of transparent bioplastics have been investigated. The long‐term technological goal is to establish biopolymers in a new market segment for demanding optical applications and to contribute to a more sustainable economy. A collection of transparent bioplastics has been tested with respect to the long‐term stability and the possibility of an application in optical components for LED lighting. The focus of materials testing was on the influence of short wavelength visible radiation as well as thermal loads. The results show, that some materials may be candidates for subsequent feasibility studies. To the best of our knowledge, the application of such polymers in complex technical products and in particular in luminaires has not yet been realized. The use of bio‐based plastics for optical components therefore represents a novelty and has a high development potential.

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Section: Introductionmentioning

confidence: 99%

Investigations on the aging behavior of transparent bioplastics for optical applications

Baltscheit

Schmidt

Schröder

et al. 2020

InfoMat

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“…In these investigations, mostly commercial aging setups based on xenon arc lamps manufactured by ATLAS TM were used. Both purely thermal- [ 17 , 18 , 19 ] and photodegradation by blue light [ 20 , 21 , 22 , 23 , 24 , 25 , 26 ] of bispenol A PC were investigated by Mehr et al For the experiments, a self-made apparatus was used, in which samples are heated simultaneously by a hot plate and irradiated by several LEDs. Sikora et al investigated the effects of pulsed UV and white light irradiation on PMMA.…”

Section: Introductionmentioning

confidence: 99%

Advanced Test Setup for Accelerated Aging of Plastics by Visible LED Radiation

2020

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In this article, a newly developed test setup for the aging of optical plastics by visible radiation (450 nm) is presented. In addition to a comprehensive monitoring of the operating parameters and an efficient cooling of the high-power multiple chips on board the LEDs used, the plastic samples can be fully temperature-controlled, independent of the radiant power of the LED, due to fluid driven thermostatization. The sample surface temperatures and irradiance values were verified by in situ measurements and simulations. To validate the test setup, polycarbonate samples with well-known aging behavior were aged for 1896 h. By spectroscopic IR and UV/vis analysis of the samples at different aging times, known optical aging results of polycarbonate could be observed, which proves the intended operationality of the system.

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“…It is known that the UV-absorptivity of polycarbonate (PC) increases due to photo-degradation [9][10][11][12][13]. The extinction coefficient of polycarbonate is relatively high for wavelengths between 330 nm and 350 nm, which corresponds to a relatively high absorptivity of light at these wavelengths [14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Bulk Temperature on Laser-Induced Periodic Surface Structures on Polycarbonate

Mezera

Römer

2019

Polymers

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In this paper, the influence of the bulk temperature (BT) of Polycarbonate (PC) on the occurrence and growth of Laser-induced Periodic Surface Structures (LIPSS) is studied. Ultrashort UV laser pulses with various laser peak fluence levels F 0 and various numbers of overscans ( N OS ) were applied on the surface of pre-heated Polycarbonate at different bulk temperatures. Increased BT leads to a stronger absorption of laser energy by the Polycarbonate. For N OS < 1000 High Spatial Frequency LIPSS (HSFL), Low Spatial Frequency LIPSS perpendicular (LSFL-I) and parallel (LSFL-II) to the laser polarization were only observed on the rim of the ablated tracks on the surface but not in the center of the tracks. For N OS ≥ 1000 , it was found that when pre-heating the polymer to a BT close its glass transition temperature ( T g ), the laser fluence to achieve similar LIPSS as when processed at room temperature decreases by a factor of two. LSFL types I and II were obtained on PC at a BT close to T g and their periods and amplitudes were similar to typical values found in the literature. To the best of the author’s knowledge, it is the first time both LSFL types developed simultaneously and consistently on the same sample under equal laser processing parameters. The evolution of LIPSS from HSFL, over LSFL-II to LSFL I, is described, depending on laser peak fluence levels, number of pulses processing the spot and bulk temperature.

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Photodegradation of bisphenol A polycarbonate under blue light radiation and its effect on optical properties

Cited by 76 publications

References 20 publications

Investigations on the aging behavior of transparent bioplastics for optical applications

Investigations on the aging behavior of transparent bioplastics for optical applications

Advanced Test Setup for Accelerated Aging of Plastics by Visible LED Radiation

Influence of Bulk Temperature on Laser-Induced Periodic Surface Structures on Polycarbonate

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