Effect of Foaming Temperature on Microstructure, Mechanical Properties and Flame Spread Rate in PET–PEN Copolymer

Byung Kyu Park, Charn-Jung Kim and Byeong Jun Lee
Additional contact information
Byung Kyu Park: Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, Korea
Charn-Jung Kim: Department of Mechanical Engineering, Seoul National University, Seoul 151-744, Korea
Byeong Jun Lee: School of Mechanical Engineering, Yeungnam University, Gyeongbuk 38541, Korea

Energies, 2021, vol. 14, issue 4, 1-14

Abstract: Polymer foams are expanding their applications into functional materials. Partial foam structure has been fabricated in polyethylene terephthalate–polyethylene naphthalate (PET–PEN) copolymer by solid state foaming. Through SEM image analyses, a potential to fabricate gradient foam structures with micropores and unfoamed skin layers has been identified. The post-foaming temperature T f tune the pore size distribution. Radial distribution of micromechanical properties, indentation hardness and elastic modulus were measured for the partial foam and their values were around 0.12 GPa and 2.0 GPa, respectively, for the outer foamed region. Foaming temperature affects the glass transition temperature T g , the coefficient of thermal expansion and the flame spreading rate. For the range of T f ? 60°C, thermal expansion coefficients for T > T g are about 0.5 m/m°C (steep expansion group, SEG). When T f is above 80 °C, they are around 0.02 m/m°C (mild expansion group, MEG). The burning rate of SEG is 2.8 times higher than that of MEG.

Keywords: copolymer; gradient foam; nano-indentation; flame spread rate; glass transition temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/14/4/957/pdf (application/pdf)
https://www.mdpi.com/1996-1073/14/4/957/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:14:y:2021:i:4:p:957-:d:497846

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().