Interlink between Tunable Material Properties and Thermoresponsiveness of Cross-Linked Poly(N‑vinylcaprolactam) Thin Films Deposited by Initiated Chemical Vapor Deposition
journal contributionposted on 30.08.2019, 18:41 by Fabian Muralter, Alberto Perrotta, Oliver Werzer, Anna Maria Coclite
In this contribution, we report on the thin-film synthesis of a novel thermoresponsive polymer, namely, poly(N-vinylcaprolactam) cross-linked by di(ethylene glycol)divinyl ether [p(NVCL-co-DEGDVE)] by initiated chemical vapor deposition (iCVD). Its transition between swollen and shrunken states in film thickness and the corresponding lower critical solution temperature (LCST) was investigated by spectroscopic ellipsometry in water. Water contact angle measurements and nano-indentation experiments reveal that the transition is accompanied by a change in wettability and elastic modulus. The amount of cross-linking was used to tune the thermoresponsive behavior of the thin films, resulting in higher swelling and LCST, increased surface rearrangement, and lower stiffness for less cross-linked polymers. For the first time, the filament temperature during iCVD synthesis was used to vary the chain length of the resulting polymeric systems and, thus, the position of their thermoresponsive transition. With that, swelling of up to 250% compared to the dry thickness and transition temperatures ranging from 16 to 40 °C could be achieved.
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thermoresponsive transitionchain lengthspectroscopic ellipsometryTunable Material Propertiesthermoresponsive behaviorThin Films DepositedLCSTfilament temperaturecross-linked polymersvinylcaprolactamnano-indentation experimentstransition temperaturesInitiated Chemical Vapor DepositioniCVD synthesisfilm thicknesssurface rearrangementnovel thermoresponsive polymersolution temperatureDEGDVECross-Linked Polythin-film synthesiswater contact angle measurementschemical vapor deposition