Fabrication of Microcellular Polyimide Film using Hybrid Laser Process with Chemical Blowing Agents

Won, Yong Hyub; Kang, Moon Suk; Oh, Jae Yong; Shin, Bo Sung

doi:10.14775/ksmpe.2013.12.6.017

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Effect Of Laser Fluence On the Number Of Pores1

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2016

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“…4(c), Fig. 4(d) [14] shows that the volume and the number of pores increased and decreased, because the pores tended to combine with each other. And the pores gradually appeared to be enlarged by laser etching.…”

Section: Effect Of Laser Fluence On the Number Of Poresmentioning

confidence: 92%

A method for fabricating a micro-structured surface of polyimide with open and closed pores

Ma¹,

Oh²,

Ahn³

et al. 2016

Journal of the Korean Physical Society

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A new approach for fabricating open and closed porous structures based on laser processing is presented. Liquid polyimide (PI) was mixed with azodicarbonamide (ADC, ADA) which is a chemical blowing agent (CBA) and mixture was pre-cured in order to fabricate solid PI film. Porous PI was prepared by irradiating PI film mixed with azodicarbonamide. The PI film with azodicarbonamide was etched by laser ablation, and the CBA was decomposed by heat induced by the absorbed laser energy. The higher the laser beam irradiation, the more pores were fabricated due to the resulting increase in CBA decomposition from 27 mJ/cm 2 to 40 mJ/cm 2 per single pulse. Higher fluence at about 50 mJ/cm 2 resulted in fewer and larger open pores, which were formed by the coalescence of small pores. In contrast, a closed porous structure was fabricated at a fluence of less than 1 mJ/cm 2 because PI was barely etched. The proposed method can be sued to create open and closed micro porous structures selectively, and is not limited to thermosetting polymers, but is also effective with thermoplastic polymers.

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Section: Effect Of Laser Fluence On the Number Of Poresmentioning

confidence: 92%