Aromatic thermosetting copolyester nanocomposite foams: High thermal and mechanical performance lightweight structural materials

POLYMER

卷:123

Article

Bakir, Mete¹  Meyer, Jacob L.^1,3  Economy, James^2,3  Jasiuk, Iwona¹ 

[1] Univ Illinois, Dept Mech Sci & Engn, Urbana, IL 61801 USA

[2] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

[3] ATSP Innovat, Champaign, IL 61820 USA

关键词: Aromatic thermosetting copolyester;    Nanocomposite foam;    Carbon nanofillers;    In-situ polymerization;    Thermal degradation stability;    Compressive mechanical strength;   

DOI  :  10.1016/j.polymer.2017.07.030

来源: Elsevier

【 摘 要 】

In this study, we present carbon nanoparticle incorporated high-performance aromatic thermosetting copolyester (ATSP) nanocomposite foams. The ATSP nanocomposite foams were fabricated through a facile solid-state mixing method wherein carboxylic acid and acetoxy-functional group oligomers were initially combined with chemically pristine carbon nanofillers separately, while in powder form. The mixtures were then subjected to a thermal condensation polymerization reaction in which the constituent oligomers formed the ester backbone of the ATSP matrix and advanced the molecular weight while acetic acid was emitted as the by-product, and generated a porous nanocomposite morphology. As compared to a neat ATSP foam, the nanocomposite foams exhibited a reduced coefficient of thermal expansion by 25% to 75 x 10(-6) degrees C-1. Thermal stability temperature at 5% mass loss was increased by 30 degrees C exceeding 500 degrees C. Compressive mechanical strength was enhanced two-fold, reaching 16 MPa along with a nearly doubled fracture strain, which ultimately yielded improved material toughness. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free