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- Title
Heat-insulating materials with high-temperature resistance through binding hollow glass microspheres with vinyl-functionalized polyborosiloxane.
- Authors
Zhang, Yu-long; Zang, Chong-guang; Jiao, Qing-jie; She-li, Yun-fei
- Abstract
In this study, a kind of novel heat-insulating material composed by the vinyl-functionalized polyborosiloxane (BSiO) and hollow glass microspheres (HGM) was successfully prepared. Under solvent-free condition, the BSiO was synthesized by reacting triethoxyvinylsilane (VTEOS) and boric acid by one-pot method and characterized by GPC, FT-IR, NMR-29Si, NMR-11B and TGA analysis. The results indicated that the monomer feed ratio of the reactant made a great difference on the molecular structure and thermal stability of the BSiO and the BSiO-2 showed the best thermal stability when the feeding ratio of VTEOS and BA was 1.5. Moreover, the ceramic conversion analysis indicated that the BSiO-2 tended to form the inorganic SiBOC nanocomposite. Properties, such as the microstructure, density, linear shrinkage, compressive strength and thermal conductivity, burning behavior and flame retardancy of the BSiO-2/HGM composites after different heat treatment, were studied. The SEM results showed that the BSiO-2 could effectively wet the surface of HGM and the HGM was glued together firmly. With the increase in heat treatment temperature, the density and thermal conductivity of BSiO-2/HGM composites reached the minimum value at 600 °C, while the compressive strength reached the maximum value. The result of flame retardancy study showed that the composites possessed high LOI value (> 50%) and hardly any smoke could be observed during the burning process. This indicated that the BSiO-2/HGM composites possessed excellent flame-retardant property and fire safety. This paper will provide ideas for the design and preparation of heat-insulating materials with polyborosiloxane as heat-resistant binder.
- Subjects
HEAT treatment; STRENGTH of materials; THERMAL conductivity; MOLECULAR structure; COMPRESSIVE strength; FIRE resistant polymers; MICROSPHERES
- Publication
Journal of Materials Science, 2020, Vol 55, Issue 29, p14264
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-020-05046-y