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Preparation and Properties of PAA/PHA/Organoclay Nanocomposite  

Yoon, Doo-Soo (Department of Bioenvironmental & Chemical Engineering, Chosun University College of Science & Technology)
Choi, Jae-Kon (Department of Polymer Science & Engineering, Chosun University)
Jo, Byung-Wook (Department of Chemical Engineering, Chosun University)
Publication Information
Polymer(Korea) / v.34, no.4, 2010 , pp. 326-332 More about this Journal
Abstract
Nanocomposite films were prepared by blending poly(amic acid)(PAA), poly(o-hydroxyamide)( PHA) and organically modified montmorillonite (OMMT) that has a layered structure. XRD, SEM and TEM were used to study the morphology of PAA/PHA nanocomposites, and DMA, TGA, UTM, LOI and PCFC techniques were used to characterize the mechanical and thermal properties, and flame retardancy of the nanocomposites. TEM images revealed that OMMT layers were well dispersed in the PAA/PHA matrix and showed exfoliation and intercalation behavior. The addition of 3 wt% OMMT to the PAA/PHA blend increased the initial modulus of PAA/ PHA blend to 3.68 GPa that was ca. 48% higher than that of the control PAA/PHA blend. Above 4 wt%, however, both the initial modulus and the tensile strength were found to decrease, which might be due to the aggregation of OMMT in PAA/PHA matrix. When the OMMT content was below 3 wt%, the thermal stability and flame retardancy of the PAA/PHA nanocomposites increased with increasing OMMT content.
Keywords
poly(amic acid); polyhydroxyamides; thermal cyclization reaction; nanocomposite;
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