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Anomalous Sorption in Thin Films of Fluoroalkyl-Ended Poly(ethylene glycol)s

Tae, Giyoong and Kornfield, Julia A. and Hubbell, Jeffrey A. and Johannsmann, Diethelm (2002) Anomalous Sorption in Thin Films of Fluoroalkyl-Ended Poly(ethylene glycol)s. Langmuir, 18 (21). pp. 8241-8245. ISSN 0743-7463.

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Absorption, desorption and swelling behavior of polymers play important roles in polymer processing and performance, ranging from issues of dimensional stability and permeability to controlling adhesion. Rich, nonlinear phenomena are associated with transient swelling and drying of glassy and semicrystalline polymers. Anomalous, non-Fickian behaviors are broadly associated with the nonlinear effects of the penetrant on the dynamics of the polymers. Here we describe anomalous behavior of a different type that is associated with a sorbent-triggered first-order phase transition. The system of interest is a hydrophilic, semicrystalline polymer with hydrophobic end groups, placed in contact with humid air.Dueto the strong tendency to absorb water, the melting transition of the crystallites can be induced by contact with sufficiently humid air; during desorption, a sufficient supersaturation mustbe reached before nucleation and regrowth of crystals occur. This leads to very different hysteresis in the sorption isotherm and overshoot in transient sorption than has been reported previously in polymers.

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Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2002 American Chemical Society. Received 13 March 2002. Published online 17 September 2002. Published in print 1 October 2002. This research was supported in part by a grant from NSF (CTS-9729443), a graduate fellowship from the Korean Ministry of Education (Giyoong Tae), and by the MRSEC Program of NSF (DMR-0080065).
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Ministry of Education (Korea)UNSPECIFIED
Issue or Number:21
Record Number:CaltechAUTHORS:20170427-105022344
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Official Citation:Anomalous Sorption in Thin Films of Fluoroalkyl-Ended Poly(ethylene glycol)s Giyoong Tae, Julia A. Kornfield, Jeffrey A. Hubbell, and Diethelm Johannsmann Langmuir 2002 18 (21), 8241-8245 DOI: 10.1021/la020255l
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77001
Deposited By: Ruth Sustaita
Deposited On:27 Apr 2017 22:13
Last Modified:03 Oct 2019 17:52

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