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Three Gel States of Colloidal Composites Consisting of Polymer-Brush-Afforded Silica Particles and a Nematic Liquid Crystal with Distinct Viscoelastic and Optical Properties

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† Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
§ Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
‡ Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
*E-mail: [email protected]
*E-mail: [email protected]
Cite this: ACS Appl. Mater. Interfaces 2016, 8, 43, 29649–29657
Publication Date (Web):October 11, 2016
https://doi.org/10.1021/acsami.6b07893
Copyright © 2016 American Chemical Society
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Abstract

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Colloidal composites consisting of polymer-brush-afforded silica particles (P-SiPs) and a nematic liquid crystal (LC) exhibited three gel states with distinct viscoelastic and/or optical properties depending on temperature: (1) opaque hard gel, (2) translucent hard gel, and (3) translucent soft gel. We demonstrated that the transitions of the optical property and the hardness of the gels were due to the phase transition of the LC matrix and the glass transition of the grafted polymers of P-SiPs, respectively. We then revealed that the gelation (the formation of the translucent soft gel) was caused by the phase separation of P-SiPs and LC matrix in an isotropic phase based on spinodal decomposition. In addition, the particle concentration and molecular weight of the grafted polymer of P-SiPs were observed to significantly affect the elastic moduli and thermal stability of the composite gels. By the addition of an azobenzene derivative into an LC matrix, we achieved photochemical switching of the transparency of the composites based on the photoinduced phase transition of LCs, while keeping self-supporting ability of the composite gel.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.6b07893.

  • Hydrodynamic diameters of the P-SiPs (Table S1), FFT analysis method applied to optical microscopy images (Figure S1), temperature dependence of the viscoelastic parameters in a cooling process (Figures S2), solubility test of a dilute PMMA/ZLI-1083 blend (Figure S3), FFT analyses in the gelation process (Figure S4), optical microscopy images in a cooling process (Figure S5), temperature dependence of the turbidity (Figure S6), SEM images of the xerogels (Figure S7), and effective graft density of P-SiPs (Figure S8) (PDF)

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Cited By

This article is cited by 4 publications.

  1. William R. Lenart, Michael J.A. Hore. Structure–property relationships of polymer-grafted nanospheres for designing advanced nanocomposites. Nano-Structures & Nano-Objects 2018, 16 , 428-440. https://doi.org/10.1016/j.nanoso.2017.11.005
  2. Takahiro Yamamoto, Yasuo Norikane, Haruhisa Akiyama. Photochemical liquefaction and softening in molecular materials, polymers, and related compounds. Polymer Journal 2018, 50 (8) , 551-562. https://doi.org/10.1038/s41428-018-0064-4
  3. Takahiro Yamamoto, Jiro Noguchi, Motoi Kinoshita, Yoshiko Takenaka, Hideyuki Kihara. Near-infrared-light-responsive liquid-crystalline composite gels with photo-healing ability. Molecular Crystals and Liquid Crystals 2018, 662 (1) , 38-45. https://doi.org/10.1080/15421406.2018.1466239
  4. Yuki Kawata, Takahiro Yamamoto, Hideyuki Kihara, Yasuhisa Yamamura, Kazuya Saito, Kohji Ohno. Unusual photoresponses in the upper critical solution temperature of polymer solutions mediated by changes in intermolecular interactions in an azo-doped liquid crystalline solvent. Physical Chemistry Chemical Physics 2018, 20 (8) , 5850-5855. https://doi.org/10.1039/C7CP08335A

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