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Title: Transparent Ethylene-Bridged Polymethylsiloxane Aerogels and Xerogels with Improved Bending Flexibility.
Authors: Shimizu, Taiyo
Kanamori, Kazuyoshi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-5087-9808 (unconfirmed)
Maeno, Ayaka
Kaji, Hironori  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-5111-3852 (unconfirmed)
Nakanishi, Kazuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-8069-4780 (unconfirmed)
Author's alias: 清水, 太陽
金森, 主祥
前野, 綾香
梶, 弘典
中西, 和樹
Issue Date: 20-Nov-2016
Publisher: American Chemical Society
Journal title: Langmuir : the ACS journal of surfaces and colloids
Volume: 32
Issue: 50
Start page: 13427
End page: 13434
Abstract: Transparent, monolithic aerogels with nanosized colloidal skeletons have been obtained from a single precursor of 1,2-bis(methyldiethoxysilyl)ethane (BMDEE) by adopting a liquid surfactant and a two-step process involving strong-acid, followed by strong-base, sol-gel reactions. This precursor BMDEE forms the ethylene-bridged polymethylsiloxane (EBPMS, O2/2(CH3)Si-CH2CH2-Si(CH3)O2/2) network, in which each silicon has one methyl, two bridging oxygens, and one bridging ethylene, exhibiting an analogous structure to that of the previously reported polymethylsilsesquioxane (PMSQ, CH3SiO3/2) aerogels having one methyl and three bridging oxygen atoms. Obtained aerogels consist of fine colloidal skeletons and show high visible-light transparency and a flexible deformation behavior against compression without collapse. Similar to the PMSQ aerogels, a careful tuning of synthetic conditions can produce low-density (0.19 g cm(-3)) and highly transparent (76% at 550 nm, corresponding to 10 mm thick samples) xerogels via ambient pressure drying by solvent evaporation due to their high strength and resilience against compression. Moreover, EBPMS aerogels exhibit higher bending strength and bending strain at break against the three-point bending mode compared to PMSQ aerogels. This improved bendability is presumably derived from the introduced ethylene-bridging parts, suggesting the potential for realizing transparent and bendable aerogels in such polysiloxane materials with organic linking units.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in 'Langmuir', copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://doi.org/10.1021/acs.langmuir.6b03249
The full-text file will be made open to the public on 20 November 2017 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
This is not the published version. Please cite only the published version.
URI: http://hdl.handle.net/2433/218200
DOI(Published Version): 10.1021/acs.langmuir.6b03249
PubMed ID: 27993023
Appears in Collections:Journal Articles

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