Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

One-Pot Sol-Gel Synthesis of Highly Insulative Hybrid P(AAm-Co-AAc)-Silica Aerogels with Improved Mechanical and Thermal Properties

Akshay A. Ransing
,
Rushikesh P. Dhavale
ORCID logo ,
Vinayak G. Parale
ORCID logo ,
Uzma K.H. Bangi
ORCID logo ,
Haryeong Choi
,
Wonjun Lee
,
Jiseung Kim
,
Qi Wang
,
Varsha D. Phadtare
ORCID logo ,
Taehee Kim
,
Wook Ki Jung
,
Hyung-Ho Park
* ORCID logo
Version 1 : Received: 19 July 2023 / Approved: 19 July 2023 / Online: 19 July 2023 (09:45:48 CEST)

A peer-reviewed article of this Preprint also exists.

Ransing, A.A.; Dhavale, R.P.; Parale, V.G.; Bangi, U.K.H.; Choi, H.; Lee, W.; Kim, J.; Wang, Q.; Phadtare, V.D.; Kim, T.; Jung, W.K.; Park, H.-H. One-Pot Sol–Gel Synthesis of Highly Insulative Hybrid P(AAm-CO-AAc)-Silica Aerogels with Improved Mechanical and Thermal Properties. Gels 2023, 9, 651. Ransing, A.A.; Dhavale, R.P.; Parale, V.G.; Bangi, U.K.H.; Choi, H.; Lee, W.; Kim, J.; Wang, Q.; Phadtare, V.D.; Kim, T.; Jung, W.K.; Park, H.-H. One-Pot Sol–Gel Synthesis of Highly Insulative Hybrid P(AAm-CO-AAc)-Silica Aerogels with Improved Mechanical and Thermal Properties. Gels 2023, 9, 651.

Abstract

Silica aerogels and their derivatives have outstanding thermal properties with exceptional values in the thermal insulation industry. However, the brittle nature restricts its large-scale commercialization. Thus, enhancing their mechanical strength without affecting their thermal insulating properties is essential. Therefore, for the first time, highly thermally stable Poly(acrylamide-Co-acrylic acid) partial sodium salt is used as a reinforcing polymer to synthesize hybrid P(AAm-CO-AAc)-silica aerogels via epoxy ring-opening polymerization in the present study. Functional groups in P(AAm-CO-AAc) partial sodium salts, such as CONH2 and COOH, acted as nucleophiles for the epoxy ring-opening reaction with (3-glycidyloxypropyl)trimethoxysilane, which resulted in a seven-fold enhancement in mechanical strength compared to that of a pristine silica aerogel while maintaining the thermal conductivity at less than 30.6 mW/mK and porosity of more than 93.68%. Moreover, the hybrid P(AAm-CO-AAc)-silica aerogel demonstrated improved thermal stability up to 343 ⁰C owing to the synergetic effect between P(AAm-CO-AAc) and the silica aerogel, corresponding to thermal stability and strong covalent bonding among them. These excellent results illustrate that this new synthetic approach for producing hybrid P(AAm-CO-AAc)-silica aerogels is useful for enhancing the mechanical strength of a pristine silica aerogel without impairing its thermal insulating property and shows potential as an industrial heat insulation material.

Keywords

One-pot sol-gel synthesis; Hybrid P(AAm-CO-AAc)-silica aerogel; Epoxy ring-opening polymerization; Thermal stability; Mechanical properties

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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