Synthesis, Properties, and Processing of New Siloxane-Substituted Poly(p-xylylene) via CVD

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Bier, Anna K. ; Bognitzki, Michael ; Schmidt, Alexander ; Greiner, Andreas ; Gallo, Emanuela ; Klack, Patrick ; Schartel, Bernhard:
Synthesis, Properties, and Processing of New Siloxane-Substituted Poly(p-xylylene) via CVD.
In: Macromolecules. Bd. 45 (2012) Heft 2 . - S. 633-639.
ISSN 1520-5835
DOI: https://doi.org/10.1021/ma2021369

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Abstract

The synthesis of a disiloxane-functionalized [2.2]paracyclophane and its polymerization to the corresponding siloxane-substituted poly(p-xylylene) via chemical vapor deposition (CVD) has been described. Because of the enhanced solubility of the siloxane substituted poly(p-xylylene) analysis of the molecular structure by NMR, molecular weight, and polydispersity by gel permeation chromatography (GPC), and processing by film casting as well as nanofiber formation by electrospinning was possible. Structural isomers were found by NMR which was expected due to the isomeric mixture of the precursor. High molecular weights at moderate polydispersities were found by GPC which was unexpected for a vapor phase deposition polymerization. The amorphous morphology in combination with a low glass transition temperature led to high elongation at break for the siloxane substituted poly(p-xylylene). Significant difference for the wetting versus water was found for as-deposited films,.solution cast films, and nanofibers obtained by electrospinning with contact angles up to 135 degrees close to superhydrophobic behavior.