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dc.contributor.authorEdiger, Mark
dc.contributor.authorPellerin, Christian
dc.contributor.authorLebel, Olivier
dc.contributor.authorGujral, Ankit
dc.contributor.authorLaventure, Audrey
dc.date.accessioned2017-04-20T18:21:40Z
dc.date.available2017-04-20T18:21:40Z
dc.date.issued2017
dc.identifier.citationLaventure, A., Gujral, A., Lebel, O., Pellerin, C. and Ediger, M.D., 2017. Influence of Hydrogen Bonding on the Kinetic Stability of Vapor-Deposited Glasses of Triazine Derivatives. The Journal of Physical Chemistry B.en
dc.identifier.urihttp://digital.library.wisc.edu/1793/76412
dc.descriptionThe effect of hydrogen bonding on the properties of vapor deposited glasses is studied.en
dc.description.abstractIt has recently been established that physical vapor deposition (PVD) can produce organic glasses with enhanced kinetic stability, high density, and anisotropic packing, with the substrate temperature during deposition (Tsubstrate) as the key control parameter. The influence of hydrogen bonding on the formation of PVD glasses has not been fully explored. Herein, we use a high-throughput preparation method to vapor-deposit three triazine derivatives over a wide range of Tsubstrate, from 0.69 to 1.08Tg, where Tg is the glass transition temperature. These model systems are structural analogues containing a functional group with different H-bonding capability at the 2-position of a triazine ring: (1) 2-methylamino-4,6-bis(3,5-dimethyl-phenylamino)- 1,3,5-triazine (NHMe) (H-bond donor), (2) 2-methoxy-4,6-bis(3,5-dimethyl-phenylamino)-1,3,5-triazine (OMe) (H-bond acceptor), and (3) 2-ethyl-4,6-bis(3,5-dimethyl-phenylamino)-1,3,5-triazine (Et) (none). Using spectroscopic ellipsometry, we find that the Et and OMe compounds form PVD glasses with relatively high kinetic stability, with the transformation time (scaled by the α-relaxation time) on the order of 103 , comparable to other highly stable glasses formed by PVD. In contrast, PVD glasses of NHMe are only slightly more stable than the corresponding liquid-cooled glass. Using IR spectroscopy, we find that both the supercooled liquid and the PVD glasses of the NHMe derivative show a higher average number of bonded NH per molecule than that in the other two compounds. These results suggest that H-bonds hinder the formation of stable glasses, perhaps by limiting the surface mobility. Interestingly, despite this difference in kinetic stability, all three compounds show properties typically observed in highly stable glasses prepared by PVD, including a higher density and anisotropic molecular packing (as characterized by IR and wide-angle X-ray scattering)en
dc.description.sponsorship1) U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award (DESC000216) 2) Natural Sciences and Engineering Research Council of Canada (NSERC) 3) University of Wisconsin− Madison MRSEC (DMR-1121288)en
dc.language.isoen_USen
dc.publisherAmerican Chemical Societyen
dc.subjectStable glass, hydrogen bonding, vapor deposition, X-Ray scattering, Infrared spectroscopy,Ellipsometryen
dc.titleInfluence of Hydrogen Bonding on the Kinetic Stability of Vapor Deposited Glasses of Triazine Derivativesen
dc.typeJournal Issueen
dc.identifier.doi10.1021/acs.jpcb.6b1267


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