Ultralight and Flexible Monolithic Polymer Aerogel with Extraordinary Thermal Insulation by A Facile Ambient Process
Abstract
High performance thermal insulation materials are desired for a wide range of applications in space, buildings, energy, and environments. Here, a facile ambient processing approach is reported to synthesize a highly insulating and flexible monolithic poly(vinyl chloride) aerogel. The thermal conductivity is measured respectively as 28 mW (m K)−1 at atmosphere approaching the air conductivity and 7.7 mW (m K)−1 under mild evacuation condition. Thermal modeling is performed to understand the thermal conductivity contributions from different heat transport pathways in air and solid. The analysis based on the Knudsen effect and scattering mean free paths shows that the thermal insulation performance can be further improved through the optimization of porous structures to confine the movement of air molecules. Additionally, the prepared aerogels show superhydrophobicity due to the highly porous structures, which enables new opportunities for surface engineering. Together, the study demonstrates an energy‐saving and scalable ambient‐processing pathway to achieve ultralight, flexible, and superhydrophobic poly(vinyl chloride) aerogel for thermal insulation applications.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 27, 2019
- Source ID
- 10.1002/admi.201900314
Entities
People
- Changyu Deng
- Chiyu Yang
- Hongyan Xia
- Joon Sang Kang
- Man Li
- Ying Cui
- Yongjie Hu
- Yunbo Wang
- Zihao Qin
Organizations
- Air Force Office of Scientific Research
- American Chemical Society Petroleum Research Fund
- National Science Foundation
- University of California, Los Angeles