Temperature-dependent dynamic moduli of Parylene-C columnar microfibrous thin films

Chandraprakash Chindam, Nicole Brown, Akhlesh Lakhtakia, Osama O. Awadelkarim, Wasim Orfali

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Columnar microfibrous thin films (μFTFs) of the polymer Parylene C with different microfiber inclination angles were fabricated using a physicochemical vapor deposition process whereby a collimated flux of hot monomers is obliquely directed towards a planar substrate. Each μFTF was then subjected to cyclic elastic loading in one of two orthogonal directions lying wholly in the substrate plane: either (i) normal or (ii) parallel to the morphologically significant plane of the μFTF. Dynamic storage and loss moduli were determined in the 1–80 Hz frequency range for temperatures between −40 °C and 125 °C. For all columnar μFTFs, the storage and loss moduli for normal loading did not exceed their counterparts for parallel loading. All columnar μFTFs were found to be softer than a bulk film of Parylene C. In both bulk and columnar forms, Parylene C was found to be rheologically not simple.

Original languageEnglish (US)
Pages (from-to)89-97
Number of pages9
JournalPolymer Testing
Volume53
DOIs
StatePublished - Aug 1 2016

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Thin films
Vapor deposition
Substrates
Monomers
Fluxes
Temperature
Polymers
parylene
Direction compound

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics

Cite this

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abstract = "Columnar microfibrous thin films (μFTFs) of the polymer Parylene C with different microfiber inclination angles were fabricated using a physicochemical vapor deposition process whereby a collimated flux of hot monomers is obliquely directed towards a planar substrate. Each μFTF was then subjected to cyclic elastic loading in one of two orthogonal directions lying wholly in the substrate plane: either (i) normal or (ii) parallel to the morphologically significant plane of the μFTF. Dynamic storage and loss moduli were determined in the 1–80 Hz frequency range for temperatures between −40 °C and 125 °C. For all columnar μFTFs, the storage and loss moduli for normal loading did not exceed their counterparts for parallel loading. All columnar μFTFs were found to be softer than a bulk film of Parylene C. In both bulk and columnar forms, Parylene C was found to be rheologically not simple.",
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Temperature-dependent dynamic moduli of Parylene-C columnar microfibrous thin films. / Chindam, Chandraprakash; Brown, Nicole; Lakhtakia, Akhlesh; Awadelkarim, Osama O.; Orfali, Wasim.

In: Polymer Testing, Vol. 53, 01.08.2016, p. 89-97.

Research output: Contribution to journalArticle

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