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Titolo:
Effect of heat treatment on bioactivity and mechanical properties of PDMS-modified CaO-SiO2-TiO2 hybrids via sol-gel process
Autore:
Chen, Q; Miyata, N; Kokubo, T; Nakamura, T;
Indirizzi:
Kyoto Univ, Fac Engn, Dept Chem Mat, Sakyo Ku, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 Chem Mat, Sakyo Ku, Kyoto 6068501, Japan Kyoto Univ, Fac Med, Dept Orthopaed Surg, Sakyo Ku, Kyoto 6068507, Japan Kyoto Univ Kyoto Japan 6068507 paed Surg, Sakyo Ku, Kyoto 6068507, Japan
Titolo Testata:
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
fascicolo: 6, volume: 12, anno: 2001,
pagine: 515 - 522
SICI:
0957-4530(2001)12:6<515:EOHTOB>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANICALLY MODIFIED SILICATES; INORGANIC GLASSES; ACID CONTENT; CERAMERS; ORMOSILS; APATITE; TI;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Kokubo, T Kyoto Univ, Fac Engn, Dept Chem Mat, Sakyo Ku, Yoshida Honmachi,Kyoto 6068501, Japan Kyoto Univ Yoshida Honmachi Kyoto Japan 6068501 6068501, Japan
Citazione:
Q. Chen et al., "Effect of heat treatment on bioactivity and mechanical properties of PDMS-modified CaO-SiO2-TiO2 hybrids via sol-gel process", J MAT S-M M, 12(6), 2001, pp. 515-522

Abstract

Crack- and pore-free transparent monolithic disks of polydimethylsiloxane (PDMS)- modified CaO-SiO2-TiO2 hybrids were obtained by hydrolysis and polycondensation of PDMS, tetraethoxysilane, tetraisopropyltitanate and calciumnitrate. The product as-dried at 60 degreesC formed an apatite on its surface in a simulated body fluid (SBF) within only one day, indicating its high bioactivity. The apatite-forming ability decreased slightly by a heat treatment below 250 degreesC. The bending strength of the product was about 11MPa, independent of the heat treatment. This average strength value is comparable to that of the human cancellous bone. Young's modulus of the products increased from 100 to 500 MPa with increasing heat treatment temperaturefrom 60 to 250 degreesC, but its values were within the range of those of the human cancellous bone. The strain at failure of the products decreased with increasing heat treatment temperature. Failure strains went down to the magnitudes exhibited by the human cancellous bone, when the products wereheat treated in the temperature range from 150 to 250 degreesC. Thus, highly bioactive hybrids with mechanical properties analogous to those of the human cancellous bone were obtained. This new kind of bioactive hybrid may be useful as a bone-repairing material. (C) 2001 Kluwer Academic Publishers.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/17 alle ore 09:21:49