Hyper-cross-linked thin polydimethylsiloxane films

Evelien Maaskant, Kristianne Tempelman, Nieck E. Benes (Corresponding Author)

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
118 Downloads (Pure)

Abstract

Polydimethylsiloxane (PDMS) elastomers are widely used in many applications, such as in microfluidic devices or as membranes. These slightly cross-linked PDMS networks suffer from severe swelling upon contact with, especially non-polar, organic solvents, thereby drastically reducing the performance of the device. Here, we report on a new method to prepare ultra-thin, highly cross-linked PDMS films in a localized fashion by the interfacial polymerization of PDMS with polyhedral oligomeric silsesquioxane (POSS). The resulting thin poly(PDMS-POSSimide) films (150 nm) showed to have a drastic reduction in swelling upon contact with n-hexane vapor (15-fold decrease) and ethyl acetate vapor (5-fold decrease). These poly(PDMS-POSSimide) films showed an increase in swelling upon contact with ethanol vapor (up to a 4-fold increase) as compared to conventional PDMS. We attribute this increase in swelling to the enhanced affinity for polar solvents of these poly(PDMS-POSSimide) films due to the presence of positively charged ammonium groups. Despite the highest swelling in ethanol, the poly(PDMS-POSSimide) films are found to have extremely low ethanol permeances (<0.1 L m−2 h−1 bar−1), thereby making them potential barrier materials.
Original languageEnglish
Pages (from-to)214-221
Number of pages8
JournalEuropean polymer journal
Volume109
Early online date28 Sep 2018
DOIs
Publication statusPublished - Dec 2018

Keywords

  • UT-Hybrid-D
  • Thin films
  • Interfacial polymerization
  • Hybrid materials
  • POSS
  • PDMS

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