Mechanical Properties of Novel Carbon Aerogels with Nanoscale Skeleton Derived from Resorcinol/Formaldehyde/Acetonitrile Sol-Gel System

作者：Wu Peidi; Zhou Bin^*; Du Ai; Li Yunong; Zhong Yanhong; Shen Jun; Wu Guangming; Ni Xingyuan; Zhang Zhihua

来源：Rare Metal Materials and Engineering, 2012, 41: 471-474.

• carbon aerogels
• acetonitrile
• room temperature
• mechanical properties
• glass transition

The novel carbon aerogels were synthesized at room temperature via sol-gel (solation-gelation) polymerization route using resorcinol and formaldehyde as precursor, acetonitrile as solvent and hydrochloric acid as catalyst, then followed by CO2 supercritical drying and carbonization in nitrogen atmosphere. By variation of the sol composition or catalyst concentration, the microstructure of the dry gels could be modified. The aerogels densities were in the range of 88 similar to 557 mg/cm(3). IR transmission spectra of the aerogels indicated that acetonitrile did not be contained in the final network, so the carbon aerogels were extremely pure. The particle sizes, determined by scanning electron microscopy(SEM), were maintained 40 similar to 70 nm. Dynamic mechanical analyzer showed that the carbon aerogels did not have phase transition at temperature (-150 similar to 300 degrees C) while density changing from 88 to 172 mg/cm(3); but when the density was 452 mg/cm(3), there was one phase transition at 50 degrees C, which meant a major glass transition; when the density was 577 mg/cm(3), there were two phases transition from -50 to 100 degrees C; the elastic modulus rose along the increase of density in the form of parabolic, and a of traditional system was larger than a of novel system.

• 出版日期2012-11
• 单位同济大学