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Janus Polymer Single Crystal Nanosheet via Evaporative Crystallization
Journal article

Janus Polymer Single Crystal Nanosheet via Evaporative Crystallization

Hao Qi, Wenda Wang and Christopher Y. Li
ACS macro letters, v 3(7), pp 675-678
01 Jul 2014
PMID: 35590767

Abstract

Physical Sciences Polymer Science Science & Technology
We show that liquid/liquid interface can guide polymer chain folding during crystallization. Evaporation-induced crystallization of telechelic dicarboxyl end-functionalized poly(epsilon-caprolactone) (COOH-PCL-COOH) at a water/pentyl acetate interface produced millimeter-scale, uniform polymer single crystal (PSC) films. Due to the asymmetric nature at the interface, the PSC nanosheets exhibited a Janus structure: the two surfaces of the crystal showed distinct water contact angle, which are quantitatively confirmed by in situ nanocondensation using environmental scanning electron microscopy (ESEM).

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