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Citation: Jian-jun Shi, Lei Kong, Xiao-biao Zuo, Deng-yao Liu, Jiao Yan, Zhi-hai Feng. Preparation of PR/SiO2 Hybrid Phenolic Aerogel with Bi-component Gel Networks[J]. Acta Polymerica Sinica, ;2018, 0(10): 1307-1314. doi: 10.11777/j.issn1000-3304.2018.18054 shu

Preparation of PR/SiO2 Hybrid Phenolic Aerogel with Bi-component Gel Networks

  • Aerospace Research Institute of Materials & Processing Technology, Science and Technology on Advanced Functional Composites Technology, Beijing 100076

  • Hybrid phenolic resin/silica (PR/SiO2) hybrid aerogels with bicomponent and interpenetrating gel networks were prepared through co-gelating reaction by controlling Sol-Gel reaction and tuning gel time of hybrid solution. In this study, variations of the hybrid aerogels properties, including apparent density, linear shrinkage, pore texture, micromorphology, thermal stability and mechanical performance, with their silica aerogel contents were investigated. The results showed that apparent density of PR/SiO2 hybrid aerogels increased proportionally with increasing content of the silica aerogels. Compared to the pure organic phenolic (PR) aerogels, pore texture for PR/SiO2 hybrid aerogels were remarkably affected by the content of silica aerogels introduced by co-gelating reactions of phenolic resin and tetraethoxysilane (TEOS) monomers. Specific surface area of PR/SiO2 hybrid aerogels was improved and the average pore diameter decreased after incorporation of silica aerogels. As studied in the research, when the concentration of TEOS monomers increased to 1.50 mol/L, the average pore diameter of PR/SiO2 hybrid aerogel extremely decreased to 0.25 μm and the specific surface area increased from 24.6 m2/g for pure PR aerogel to 44 m2/g. Micromorphology detected by scanning electron microscopy (SEM) displayed that larger pores of hybrid aerogels were gradually filled by silica sol particles with increasing content of silica aerogels, which brought forth much more small openings and wider distribution for the pore diameter. Additionally, the skeleton’s strength and thermal stability of PR/SiO2 hybrid aerogels were efficiently enhanced after the incorporation of silica aerogels. As the concentration of TEOS monomers was 1 mol/L, the temperature corresponding to the maximum pyrolysis rate (Tmax) was improved from 539 °C to 602 °C, and the thermal decomposition zone of phenolic resin was evidently widened, which suggested that incorporation of silica aerogels effectively inhibited the pyrolysis of phenolic resins. The big promotion of thermal stability for PR/SiO2 hybrid aerogels was attributed to the thermal barrier and nano-dispersion of SiO2 sol particles in organic skeletons.
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