期刊
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
卷 52, 期 2, 页码 219-227出版社
SPRINGER
DOI: 10.1007/s10971-009-2019-x
关键词
Natural rubber; In situ silica; Sol-gel preparation; Nanocomposite materials; Mechanical properties
资金
- Chulalongkorn University [GDNS51-061-23-004]
- Center of Excellence for Petroleum
- Petrochemicals, and Advanced Materials, (NCE-PPAM)
- Graduate School, Chulalongkorn University
The in situ silica filling of natural rubber (NR) was carried out via the sol-gel reaction using tetraethoxysilane. The effect of the in situ silica content on the curing, mechanical, dynamic mechanical and thermal properties of the composite vulcanizate materials was investigated in comparison to that with a commercial silica preparation. The Mooney viscosity of the in situ silica filled NR vulcanizates showed a lower value compared with that of the commercial filled ones. The mechanical properties of the in situ silica composite materials, i.e., the moduli and compression set, were improved compared with the commercial silica filler NR vulcanizates. The reinforcement effect of in situ silica did not accord with the Smallwood equation but in contrast was in good agreement with the Guth and Gold equation using a shape factor (f) which itself was in close agreement with estimates derived from independent TEM analysis. The pseudo-network structure of the in situ silica was low, which resulted in a lower storage modulus at 25 degrees C. By filling NR with in situ silica, the thermal properties of the composite vulcanized material were also improved, and well dispersed in situ silica particles within the NR matrix were also observed.
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