Growth Rate and Cross-Linking Kinetics of Poly(divinyl benzene) Thin Films Formed via Initiated Chemical Vapor Deposition

Langmuir : the ACS Journal of Surfaces and Colloids
Priya MoniKaren K Gleason

Abstract

Initiated chemical vapor deposition (iCVD) allows for the formation of highly cross-linked, polymer thin films on a variety of substrates. Here, we study the impact of substrate stage temperature and filament temperature on the deposition and cross-linking characteristics of iCVD from divinyl benzene. Maintaining a constant monomer surface concentration reveals that deposition rates upward of 15 nm/min can be achieved at substrate stage temperatures of 50 °C. The degree of cross-linking is limited by the rate of initiation of the pendant vinyl bonds. At a filament temperature of 200 °C, the pendant vinyl bond conversion is highly sensitive to the surface concentration of initiator radicals. A significant decrease of the pendant vinyl bond conversion is observed with increasing stage temperatures. At higher filament temperatures, the pendant vinyl bond conversion appears to plateau at approximately 50%. However, faster deposition rates yield lower conversion. This trade-off is mitigated by increasing the filament temperature to increase initiator radical production. A higher flux of initiator radicals toward the surface at a constant deposition rate increases the rate of initiation of pendant vinyl bonds and therefore their over...Continue Reading

References

Apr 12, 2005·Science·Du Yeol RyuThomas P Russell
Apr 20, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Yu Mao, Karen K Gleason
Jul 26, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·W Shannan O'ShaughnessyKaren K Gleason
Apr 25, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Wyatt E Tenhaeff, Karen K Gleason
Jan 21, 2016·Macromolecular Rapid Communications·Nan ChenKaren K Gleason
May 11, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Xavier LepróSalmaan Baxamusa

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