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PreprintCC BY-NCChemRxiv

Polymethylsilsesquioxane Aerogel-like Xerogels via a Surfactant-Free Base-Catalyzed Process

  • Gen Hayase1
  • Yuta Sakurai2
  • Yusaku Azuma2
  • Hironori Kaji2
  1. 1Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, Japan, 305-0044
  2. 2Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, Japan, 611-0011
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Abstract

Highly insulating polymethylsilsesquioxane (PMSQ) aerogel-like xerogels were prepared from methyltrimethoxysilane in 2-propanol (IPA)/water using 10 wt % aqueous tetraethylammonium hydroxide in a one-step reaction without an acid step or surfactant. Fine interconnected skeletons were obtained after ambient-pressure drying. Infrared spectroscopy and solid-state 29Si nuclear magnetic resonance indicated fewer residual silanols in the dried material than in a two-step reference. A 20-fold scale-up gave effective thermal conductivities of 0.018 W m−1 K−1 for granular material and 0.021 W m−1 K−1 for a PMSQ-filled panel with a polycarbonate casing at 20 °C. This provides a simple route to insulating granular PMSQ.

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Cite

BibTeXRIS
BibTeX
@misc{hayase2026polymethylsilsesquioxane,
  title = {{Polymethylsilsesquioxane Aerogel-like Xerogels via a Surfactant-Free Base-Catalyzed Process}},
  author = {Gen Hayase and Yuta Sakurai and Yusaku Azuma and Hironori Kaji},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv.15010592/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010592/v1},
  note = {CC BY-NC},
}
RIS
TY  - UNPB
TI  - Polymethylsilsesquioxane Aerogel-like Xerogels via a Surfactant-Free Base-Catalyzed Process
AU  - Gen Hayase
AU  - Yuta Sakurai
AU  - Yusaku Azuma
AU  - Hironori Kaji
PY  - 2026
DA  - 2026/10/16
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15010592/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010592/v1
AB  - Highly insulating polymethylsilsesquioxane (PMSQ) aerogel-like xerogels were prepared from methyltrimethoxysilane in 2-propanol (IPA)/water using 10 wt % aqueous tetraethylammonium hydroxide in a one-step reaction without an acid step or surfactant. Fine interconnected skeletons were obtained after ambient-pressure drying. Infrared spectroscopy and solid-state 29Si nuclear magnetic resonance indicated fewer residual silanols in the dried material than in a two-step reference. A 20-fold scale-up gave effective thermal conductivities of 0.018 W m−1 K−1 for granular material and 0.021 W m−1 K−1 for a PMSQ-filled panel with a polycarbonate casing at 20 °C. This provides a simple route to insulating granular PMSQ.
ER  -