Citation: Hong-ying Zhao, Jing-bo Zhao, Hao Li, Tong Zhao. Preparation and Characterization of Polyborosiloxanes and Their Blends with Phenolic Resin as Shapeable Ceramic Precursors[J]. Chinese Journal of Polymer Science, ;2014, 32(2): 187-196. doi: 10.1007/s10118-014-1393-1 shu

Preparation and Characterization of Polyborosiloxanes and Their Blends with Phenolic Resin as Shapeable Ceramic Precursors

1.
Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2.
Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy Science, Beijing 100190, China

Corresponding author: Jing-bo Zhao,
Received Date: 10 April 2013
Revised Date: 8 June 2013

Two polyborosiloxanes (PBSis) with char yield up to 74.13% at 800 ℃ were synthesized by the direct polycondensation of boric acid with phenyltrimethoxysilane in diglyme. The PBSis were characterized by gel permeation chromatography, IR spectroscopy as well as 1H-, 29Si- and 11B-NMR. PBSi modified phenol-formaldehyde resins (PBSi/PFs) were prepared at different PBSi/PF mass ratios and were cured at 150 ℃. The PBSi/PFs were characterized by IR spectroscopy, scanning electron microscopy, thermogravimetric analysis and tensile test. The results revealed that the cured PBSi/PFs had sea-island morphology and higher char yield than the common PF. PBSi/PF blend with PBSi/PF mass ratio of 0.4:1 had char yield up to 70.83% at 800 ℃. The PBSi/PFs had tensile strength similar to PF. The ceramization of PBSi/PFs was also studied. The silicon boron oxycarbide (SiBOC) ceramics formed were characterized by IR spectroscopy and elemental analysis. This method provided a valuable way to prepare easily shapeable polymer blends as ceramic precursors.
- Polyborosiloxane,
- Phenolic resin,
- Preparation,
- Ceramic precursors,
- SiBOC ceramics
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