Synthesis and barrier properties of poly(ε‐caprolactone)‐layered silicate nanocomposites

Wiley - Tập 33 Số 7 - Trang 1047-1057 - 1995
Phillip B. Messersmith1, Emmanuel P. Giannelis1
1Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853.

Tóm tắt

AbstractA new polymer‐ceramic nanocomposite has been synthesized consisting of well‐dispersed, two‐dimensional layers of an organically modified mica‐type silicate (MTS) within a degradable poly(ε‐caprolactone) matrix. A protonated amino acid derivative of MTS was used to promote delamination/dispersion of the host layers and initiate ring‐opening polymerization of ε‐caprolactone monomer, resulting in poly(ε‐caprolactone) chains that are ionically bound to the silicate layers. The polymer chains can be released from the silicate surface by a reverse ion‐exchange reaction and were shown to be spectroscopically similar to pure poly(ε‐caprolactone). Thick films of the polymer nanocomposite exhibit a significant reduction in water vapor permeability that shows a linear dependence on silicate content. The permeability of nanocomposite containing as low as 4.8% silicate by volume was reduced by nearly an order of magnitude compared to pure poly(ε‐caprolactone). © 1995 John Wiley & Sons, Inc.

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The apparent aspect ratio of approximately 70 is the result of curve‐fitting eq. (7) of Ref. 63 to the permeability data shown in Table IV. The use of this equation carries the assumption that permeability through the composite film is dominated by the tortuous diffusion paths created by overlapping silicate layers oriented parallel to the plane of the film.

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Wiley

Tập 33 Số 7

1047-1057

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