@article{a2de4c98b3ac44b2a36b8ab8777d947f,
title = "Processing-dependent mechanical properties of solvent cast cyclic polyphthalaldehyde",
abstract = "Cyclic polyphthalaldehyde (cPPA) is a metastable polymer that undergoes rapid depolymerization in the solid state making it useful as a packaging and substrate material for transient electronics. Here, we report solvent based processing methods to fabricate free standing polymeric films and the mechanical properties of those films. Three solvents: dioxane (bp 101 °C), chloroform (bp 61 °C), and DCM (bp 40 °C) were explored for solvent casting of cPPA. Higher residual solvent concentrations were observed with an increase in the boiling point of the solvent, leading to large variations in the glass transition temperature (64–95 °C), as measured by dynamic mechanical analysis. Quasi-static tensile testing of solvent cast cPPA films gave an elastic modulus (2.5–3 GPa), tensile strength (25–35 MPa), and failure strain (1–1.5%) that vary depending on the type of solvent used.",
keywords = "Metastable polymer, Plasticizer, Polyphthalaldehyde, Solvent casting",
author = "{Lopez Hernandez}, Hector and Takekuma, {Satoshi K.} and Mejia, {Edgar B.} and Plantz, {Christopher L.} and Sottos, {Nancy R.} and Moore, {Jeffrey S.} and White, {Scott R}",
note = "Funding Information: Satoshi Takekuma and Edgar Mejia contributed equally to this work with a focus on the processing and mechanical characterization of cPPA. Christopher Plantz polymerized and synthesized much of the cPPA for this work. The authors thank the Microanalysis Laboratory in the School of Chemical Sciences at the University of Illinois for halide analysis of cPPA films. We also thank AFOSR Center for Excellence in Self-Healing, Regeneration and Structural Remodeling (grant number FA9550-16-1-0017 ) and Defense Advanced Research Projects Agency ( FA8650-15-C-7522 ). Funding Information: This work was supported by the Defense Advanced Research Projects Agency ( FA8650-15-C-7522 ) and the AFOSR Center for Excellence in Self-Healing, Regeneration and Structural Remodeling (grant number FA9550-16-1-0017 ). HLH was partially supported by a Beckman Institute Graduate Fellowship . Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",
year = "2019",
month = jan,
day = "24",
doi = "10.1016/j.polymer.2018.12.016",
language = "English (US)",
volume = "162",
pages = "29--34",
journal = "Polymer",
issn = "0032-3861",
publisher = "Elsevier BV",
}