Preparation of Silica-Silk Fibroin-Polyurethane Composite Films via a Sol-Gel Route View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2000-12

AUTHORS

Manabu Tsujino, Tetsuhiko Isobe, Mamoru Senna

ABSTRACT

A tetraethoxysilane (TEOS)-derived sol aged for 0 h–6 h at room temperature was mixed with a polyurethane (PU) matrix. A composite of silk fibroin (SF) powders and acrylamide (AAm) was dispersed in the sol-PU mixture and dried isothermally at temperatures between 25°C and 120°C to obtain composite films. Three competitive reactions take place, i.e., those between silica-silica, SF-PU and silica-organic phases, during formation of the composite films. These reactions determine the properties such as morphology and homogeneity of the composite films. IR absorption bands for amide groups (–CONH–), ν C=O (amide I, 1730 cm−1) and δ N–H (amide II, 1530 cm−1) become larger with decreasing aging time of TEOS-derived sol, or increasing drying temperature. DTA exothermic peak due to the thermal decomposition of SF-AAm composite, on the composite films prepared from the 0 h-aged sol or dried at more than 50°C, shifts toward higher temperature by 44 K or more than 63 K respectively, as compared to the SF-AAm composite. Shorter aging time of TEOS-derived sol and higher drying temperature increased the extent of dispersibility, among SF-AAm composite, PU and silica, to bring a composite film more homogeneous. More... »

PAGES

785-789

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1008712200671

DOI

http://dx.doi.org/10.1023/a:1008712200671

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1025052389


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