A new class of oligomeric dimethylsiloxane-terminated thiol-based adsorbates was designed, synthesized, and used to generate self-assembled monolayers (SAMs) on gold that mimic the surface of polydimethylsiloxane (PDMS). Four oligomeric dimethylsiloxane-terminated alkanethiols, HS(CH2)nSi[O(Si(CH3)2O)mSi(CH3)3]3 where m ≥ 1 and n = 4, 5, 10, and 13, were synthesized and characterized. Subsequently, the SAMs generated from these new adsorbates were characterized using ellipsometry, polarization modulation infrared reflection-absorption spectroscopy (PM-IRRAS), and X-ray photoelectron spectroscopy (XPS). Furthermore, the wettabilities of these dimethylsiloxane-terminated SAMs and their polymer counterpart, PDMS, were evaluated using a variety of contacting liquids having a wide range of polarities. The results showed that the new SAMs can serve as suitable models for evaluating the interfacial properties of PDMS without interference from surface reconstruction.

Oligomeric dimethylsiloxane–terminated self–assembled monolayers for mimicking polydimethylsiloxane surfaces

ACS Fall 2021

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