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http://dx.doi.org/10.7317/pk.2012.36.4.478

Transparent Polyimide Nanocomposite Films with Various Equi-biaxial Stretching Ratios  

Kim, Young-Min (School of Energy and Integrated Materials Engineering, Kumoh National Institute of Technology)
Chang, Jin-Hae (School of Energy and Integrated Materials Engineering, Kumoh National Institute of Technology)
Publication Information
Polymer(Korea) / v.36, no.4, 2012 , pp. 478-485 More about this Journal
Abstract
A series of transparent polyimide (PI) nanocomposite films was synthesized from bicyclo(2,2,2)oct-7-ene-2,3,5,6-tetracarboxylic dianhydride (BTDA) and 1,3-bis(3-aminophenoxy)benzene (BAPB) with various organoclay contents via solution intercalation polymerization to poly(amic acid)s, followed by thermal imidization. Varying organoclay loading in a range of 0 to 1.5 wt% produced variations in the optical transparency, morphology, and oxygen barrier property of the hybrids. An optimum oxygen barrier property was observed for the hybrids containing 1.0 wt% Cloisite 30B; these properties were degraded gradually by further increases in the clay content. The PI hybrid films were found to exhibit excellent optical transparency and almost no color. However, the transparency of the hybrid films decreased slightly with increasing organoclay content. Transparent PI hybrid films containing 1.0 wt% Cloisite 30B were stretched equi-biaxially with various stretching ratios in a range of 100-140% to investigate their optical transparency and oxygen permeability in detail; the variations of clay dispersion and morphology were also determined as a function of equi-biaxial stretching ratio. PI hybrid films with ${\geq}120%$ stretching were found to contain homogeneously dispersed clay in the polymer matrix and exfoliated nanocomposites. The highest barrier to oxygen permeation was found at an equi-biaxial stretching ratio of 130%.
Keywords
transparent polyimide; organoclay; nanocomposite; equi-biaxial stretching;
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