Preprint Article Version 1 This version is not peer-reviewed

Thermal and Mechanical Characterization of Copolymer Structure with Gradient Foam Using Additive Manufacturing and CO2 Foaming

Version 1 : Received: 18 October 2019 / Approved: 19 October 2019 / Online: 19 October 2019 (02:10:29 CEST)

How to cite: Park, B.K.; Kim, C.; Kwon, D.E.; Lee, Y. Thermal and Mechanical Characterization of Copolymer Structure with Gradient Foam Using Additive Manufacturing and CO2 Foaming. Preprints 2019, 2019100222 (doi: 10.20944/preprints201910.0222.v1). Park, B.K.; Kim, C.; Kwon, D.E.; Lee, Y. Thermal and Mechanical Characterization of Copolymer Structure with Gradient Foam Using Additive Manufacturing and CO2 Foaming. Preprints 2019, 2019100222 (doi: 10.20944/preprints201910.0222.v1).

Abstract

Synthetic polymer-based gradient foams have considered as promising category of functionally graded materials with unique properties. In this study, the carbon dioxide (CO2) foaming technology has used for PET-PEN (Polyethylene Terephthalate - Polyethylene Naphthalate) copolymer towards porous functional materials with thermal insulation with reasonable mechanical strength. Through scanning electron microscope based morphological characterization, a potential to fabricate gradient foam structures with micro-pores has identified. It has shown that variation of post-foaming temperature can tune the pore size distribution although the very high post-foaming temperature tends to cause structural instability. Thermal measurement data set the limits of operation, confirmed by simultaneous differential scanning calorimeter and thermo-gravimetric analysis. Mechanical stress and thermal conductivity also has measured to find rationale of thermal insulation with reasonable mechanical strength and to elucidate the actual 3D grid foam of copolymer.

Subject Areas

3D structure; gradient foam; additive manufacturing; CO2 foaming; copolymer

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