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One-Pot Sol–Gel Synthesis of Highly Insulative Hybrid P(AAm-CO-AAc)-Silica Aerogels with Improved Mechanical and Thermal Properties.
- Source :
- Gels (2310-2861); Aug2023, Vol. 9 Issue 8, p651, 15p
- Publication Year :
- 2023
-
Abstract
- Silica aerogels and their derivatives have outstanding thermal properties with exceptional values in the thermal insulation industry. However, their brittle nature restricts their 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 CONH<subscript>2</subscript> 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 pristine silica aerogel while maintaining 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 °C, owing to the synergetic effect between the P(AAm-CO-AAc) and the silica aerogel, corresponding to the 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 pristine silica aerogel without impairing its thermal insulating property and shows potential as an industrial heat insulation material. [ABSTRACT FROM AUTHOR]
- Subjects :
- THERMAL properties
SOL-gel processes
AEROGELS
POLYMERIZATION
FUNCTIONAL groups
Subjects
Details
- Language :
- English
- ISSN :
- 23102861
- Volume :
- 9
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Gels (2310-2861)
- Publication Type :
- Academic Journal
- Accession number :
- 170739774
- Full Text :
- https://doi.org/10.3390/gels9080651