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Properties and structure of poly(vinyl alcohol)/silica composites

✍ Scribed by Koji Nakane; Tomonori Yamashita; Kenji Iwakura; Fumio Suzuki

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 176 KB
Volume: 74
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19991003)74:1<133::aid-app16>3.0.co;2-n

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✦ Synopsis

The relationships between the properties and structure are discussed for poly(vinyl alcohol)(PVA)/silica composites prepared through the sol-gel process. The composites became stiff and brittle with increasing the silica content. The properties of the composites were changed drastically at around the composition of PVA/silica ϭ 70/30 wt %. For example, there was no large change in the Young's modulus above 30 wt % of silica content (Pure PVA: 31.8 MPa, silica 30%: 52.6 MPa, silica 50%: 55.2 MPa). Consequently, it was considered that the three-dimensional network structure of silica could be formed in the composite with more than 30 wt % of silica in PVA. From this behavior, it could be considered that the crystal growth of PVA was remarkably inhibited by silica network.

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