Annealing Effect on Microhardness and Elastic Constants of PMMA

Afifi, H.; Hasan, Ebtisam H.

doi:10.1081/ppt-120023094

Cited by 21 publications

(18 citation statements)

References 13 publications

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“…As stated in Ref. [34], the increase in microhardness may be due to the formation of such effects as crosslinking, modifications to chain structure, and modifications to the side group of the polymer. All these reasons may cause C H bonds and methyl groups to be more stable, and rigid structure can be obtained while the duration increases to 3 h. This structural phenomenon was tried to be supported by infrared results explained below.…”

Section: Glass Transition Temperature and Hardness Resultsmentioning

confidence: 98%

Heat treatment effect on erosion behavior of poly(methylmethacrylate) for optical transmittance efficiency

Çoban

2014

Applied Surface Science

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Section: Glass Transition Temperature and Hardness Resultsmentioning

confidence: 98%

Heat treatment effect on erosion behavior of poly(methylmethacrylate) for optical transmittance efficiency

Çoban

2014

Applied Surface Science

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“…Artery surrogates that mimic absorbing and scattering properties of vascular structures with varying compositions were , and imposes an acoustic contrast in our sample [2]. Both tubes first contained air, but we also mimic the presence of blood in the vessels with an infrared absorbing dye (Epolight TM 2057, Epolin, Newark, NJ, USA) dissolved in isopropyl alcohol.…”

Section: Methodsmentioning

confidence: 99%

Characterizing Phantom Arteries with Multi-channel Laser Ultrasonics and Photo-acoustics

Johnson

Wijk

Sabick

2014

Ultrasound in Medicine & Biology

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Multi-channel photoacoustic and laser-ultrasonic waves are used to sense the characteristics of proxies for healthy and diseased vessels. The acquisition system is non-contacting and non-invasive with a pulsed laser source, and a laser vibrometer detector. As the wave signatures of our targets are typically low in amplitude, we exploit multi-channel acquisition and processing techniques. These are commonly used in seismology, to improve the signal-to-noise ratio of our data. We identify vessel proxies with a diameter on the order of 1 mm, at a depth of 18 mm. Variations in scattered and photoacoustic signatures are related to differences in vessel wall properties and content. The methods described have the potential to improve imaging and better inform interventions for atherosclerotic vessels, such as the carotid artery.

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“…Temperature is a major parameter in the annealing of the polymer. From previous research, the PMMA used for this study has been observed to be most stable if annealed at 80°C below T g [9]. Therefore, annealing was performed at 80°C in order to minimize the residual stress within the structure, and an electricfurnace (Yamato Co., DR200) was used for a uniform heat treatment.…”

Section: Annealing Of the Polymer Microstructurementioning

confidence: 99%

“…An imprinted structure with such residual stress causes rearrangement by the surface tension and stabilized movement of the polymer chain, with its elastic modulus and hardness becoming affected, resulting in the dimensional change of the polymeric optical device. After a certain period of annealing at a given temperature, a polymer structure with residual stress is rearranged and stabilized, and its stress finally becomes relaxed [9]. Therefore, the aim of this study is to fabricate a new polymeric optical device by introducing the imprint technique and evaluating the long-term reliability of the imprinted structure.…”

Section: Introductionmentioning

confidence: 99%