Stimuli-Responsive Films Based on N-Substituted Polyurethane with Different Alkyl Length

Yanyan Wang; Libin Liu; Congde Qiao; Tianduo Li

doi:10.1071/CH13178

RESEARCH ARTICLE

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Stimuli-Responsive Films Based on N-Substituted Polyurethane with Different Alkyl Length

Yanyan Wang ^A , Libin Liu ^A ^B , Congde Qiao ^A and Tianduo Li ^A ^B

+ Author Affiliations

- Author Affiliations

^A Shandong Provincial Key Laboratory of Fine Chemicals, Key Laboratory of Fine Chemicals in Universities of Shandong, Qilu University of Technology, Jinan 250353, China.

^B Corresponding authors. Email: lbliu@qlu.edu.cn; litianduo@163.com

Australian Journal of Chemistry 66(11) 1361-1369 https://doi.org/10.1071/CH13178
Submitted: 16 April 2013 Accepted: 24 June 2013 Published: 1 August 2013

Abstract

N-Alkyl-substituted polyurethanes with different alkyl chain lengths were prepared from the corresponding bromoalkane (1-bromooctane, 1-bromotetradecane, and 1-bromooctadecane) and polyurethane consisting of poly(propylene glycol) (PPG), 4,4′-diphenylmethane diisocyanate, and 1,4-butanediol. The synthesised materials were characterised by ¹H NMR and FTIR spectroscopy and the degrees of substitution were discussed by changing the reaction conditions. Differential scanning calorimetry and X-ray diffraction were used to characterise the thermal properties and crystalline state. Microphase-separated nanostructures, with hard segments (nanofibre-like) embedded into amorphous PPG soft segments, are observed by atomic force microscopy and scanning electron microscopy. A reversible behaviour of the films was revealed by contact angle measurement. Stimuli-responsive films were realised by solvent vapour annealing and heat treatment, and exhibited a reversible switching in surface wettability with a remarkable change in the water contact angle of 21°.

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Stimuli-Responsive Films Based on N-Substituted Polyurethane with Different Alkyl Length

Abstract

References

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