Analysis of Thermal Radiation Properties of Polyimide and Polymeric Materials Based on ATR-IR spectroscopy

Okada, T.; Ishige, Ryohei; Ando, Shinji

doi:10.2494/photopolymer.29.251

Cited by 42 publications

(25 citation statements)

References 4 publications

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“…The transmittance spectra and absorption bands of both the studied PE polymers in Ref. [37] show close agreement with the spectroscopic analyses of PE samples studied here. Similarly, the reflectance and transmittance characteristics of 100 μm thick HDPE film was reported by Mastai et al [46] which also show close agreements with [37].…”

Section: Experimentalnumerical Comparisons For Ir Heating Of Pe Platesupporting

confidence: 84%

“…Therefore, it is assumed that all incident radiation is either absorbed or reflected on the surface of opaque medium, whereas no transmission of radiation through its medium is considered. However, this is not the case for PE polymer as it is semi-transparent [37,38,46], which is also shown in this study considering its spectroscopic measurements. Simply, the emissivity of semi-transparent materials is a global physical quantity which theoretically represent emission from medium but not from surface [20,47], due to volumetric absorption.…”

Section: Experimentalnumerical Comparisons For Ir Heating Of Pe Platementioning

confidence: 51%

“…Regarding the transmittance behavior of PE, it has several narrow bands in MIR range where it shows very low transmittance and therefore it is close to be opaque [5,37,38]. Therefore, accurate IR thermographic measurements may be performed on PE surface only considering these spectral bands.…”

Section: Ir Thermography In Semi-transparent Pe Medium and Preliminarmentioning

confidence: 99%

“…Nevertheless, it may be assumed that the emissivity measurements in very thin PE samples may represent ε surface . For instance, the optical properties of 100 μm thick HDPE and LDPE films was experimentally characterized by Okada et al [37] and the emissivity values for both type of PE polymer was found around 0.28. The transmittance spectra and absorption bands of both the studied PE polymers in Ref.…”

Section: Experimentalnumerical Comparisons For Ir Heating Of Pe Platementioning

confidence: 99%

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A combined experimental and numerical approach for radiation heat transfer in semi-crystalline thermoplastics

Boztepe

Almeida

Gilblas

et al. 2019

International Journal of Thermal Sciences

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This paper proposes a novel experimental-numerical approach for radiation heat transfer in semi-crystalline thermoplastics. The proposed experimental and numerical approaches were analyzed here for the case of IR heating of linear polyethylene (PE). The challenges for radiation transport in semi-crystalline polymers may be categorized into the two main aspects: optical heterogeneity in polymer medium due to semi-crystalline nature and, semi-transparency in certain type of such polymers, like PE. In this study, we address the temperature dependence in the thermo-optical properties of semi-crystalline thermoplastics concerning its effect as a thermal radiation parameter for radiation heat transfer modeling of such type of polymers. The temperature dependence in the optical properties of PE, namely transmittance and reflectance characteristics, were experimentally analyzed under heating condition and, the temperature-dependent thermo-optical properties of PE was determined. The experimental analyses showed that the change in the thermo-optical properties under heating is related to change in the optical scattering behavior in PE medium since it is strongly affected by its crystalline structure. The radiation heat transfer model was built based on optically homogeneous medium assumption at which the change in the amount of radiative energy absorbed by the PE medium under heating was introduced without modeling how the light scatters inside of the medium. Thus, the effect of optical scattering on the absorption characteristics of PE under varying temperature was taken into account without modeling the spatial distribution of the scattered light intensity at microscopic level, which offers computationally cost-effective numerical solutions. The accuracy of the numerical model was analyzed performing IR heating experiments where IR thermography and thermocouples were employed for the surface temperature measurements. Due to the semi-transparent nature of PE, an experimental method was developed for IR thermography of PE and its accuracy was analyzed. The experimental-numerical comparisons showed that the temperature field on PE can be closely predicted using its temperature-dependent thermo-optical properties. Thanks to the adopted comparative case study, it was demonstrated how the temperature field predictions may deviate from the experimental thermal measurements due to the ignorance of this temperature dependence. Considering any type of monochromatic or polychromatic radiation source, the combined experimental-numerical approach proposed here may be adopted for temperature field predictions and non-invasive surface temperature measurements on the radiatively heated semi-crystalline thermoplastics.-* Corresponding author.

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Section: Experimentalnumerical Comparisons For Ir Heating Of Pe Platesupporting

confidence: 84%

Section: Experimentalnumerical Comparisons For Ir Heating Of Pe Platementioning

confidence: 51%

Section: Ir Thermography In Semi-transparent Pe Medium and Preliminarmentioning

confidence: 99%

Section: Experimentalnumerical Comparisons For Ir Heating Of Pe Platementioning

confidence: 99%

See 2 more Smart Citations

A combined experimental and numerical approach for radiation heat transfer in semi-crystalline thermoplastics

Boztepe

Almeida

Gilblas

et al. 2019

International Journal of Thermal Sciences

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“…For each case studied, the actuator is not activated for initial 2 s and then turned on for 35 s. The surface emissivity of the Kapton is used to calculate the temperature, which is set at 0.83. 40 The surface temperature of the exposed electrode, made of copper, is not given in this study due to the different surface emissivity. Other parameters, including the working distance of the camera, the room temperature, and its relative humidity, are also taken into account for the temperature calculation.…”

Section: Fig 3 Schematic Illustration Of Sample Lines and Pointsmentioning

confidence: 99%

Mechanism study of coupled aerodynamic and thermal effects using plasma actuation for anti-icing

Meng

et al. 2019

Physics of Fluids

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Anti-icing performance using the surface dielectric barrier discharge plasma actuator is studied using detailed visualization and surface thermal measurements. To reveal the physical mechanism of coupled aerodynamic and thermal effects on anti-icing, three types of actuators are designed and mounted on a NACA 0012 airfoil. The coupled aerodynamic and thermal effects are confirmed in still air. The results show that the plasma actuation is effective for in-flight anti-icing, and the anti-icing performance is directly related to the design of the plasma actuators based on the coupled aerodynamic and thermal effects. When the direction of plasma induced flow is consistent with the incoming flow, the heat generated by plasma discharge is concentrated in the region of the actuator and the ability of the actuator for heat transfer downstream is relatively weak during the anti-icing. When the induced flow is opposite to the incoming flow, there is less heat accumulation in the actuator region, while the ability of heat transfer downstream becomes stronger. With the consistent and opposite direction of induced flow, the plasma actuation can ensure that 57% and 81% chord of the lower surface of the airfoil are free of the ice accumulation, respectively. Another actuator is designed to induce the air jets approximately perpendicular to the airfoil surface. This exhibits both a stronger ability of heat accumulation locally and heat transfer downstream and hence ensures that there is no ice on the entire lower surface of the airfoil.

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3D Printing by Two‐Photon Polymerization of Polyimide Objects and Demonstration of a 3D‐printed Micro‐Hotplate

Pagliano

Schröder

Stemme

et al. 2023

Adv Materials Technologies

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Polyimides are polymeric materials with outstanding thermal, chemical, and mechanical properties. For this reason, they find applications in several engineering sectors, including aerospace, microsystems, and biomedical applications. For realizing 3D structures made of polyimides, 3D printing is an attractive technique because it overcomes the limitations of polyimide processing using conventional manufacturing techniques such as molding and subtractive manufacturing. However, current polyimide 3D printing approaches are limited to realizing objects with the smallest dimensions of the order of a few hundred micrometers. 3D printing of polyimide objects featuring sub‐micrometer resolution using two‐photon polymerization by direct laser writing is demonstrated here. A negative photosensitive polyimide is applied that is widely used in microsystems applications. To demonstrate the utility of this polyimide 3D printing approach and the compatibility of the 3D objects with operation at elevated temperatures, a micro‐hotplate is 3D printed and characterized at operating temperatures of above 300 °C.

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Analysis of Thermal Radiation Properties of Polyimide and Polymeric Materials Based on ATR-IR spectroscopy

Cited by 42 publications

References 4 publications

A combined experimental and numerical approach for radiation heat transfer in semi-crystalline thermoplastics

A combined experimental and numerical approach for radiation heat transfer in semi-crystalline thermoplastics

Mechanism study of coupled aerodynamic and thermal effects using plasma actuation for anti-icing

3D Printing by Two‐Photon Polymerization of Polyimide Objects and Demonstration of a 3D‐printed Micro‐Hotplate

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