Journal
POLYMER ENGINEERING AND SCIENCE
Volume 42, Issue 6, Pages 1141-1150Publisher
SOC PLASTICS ENG INC
DOI: 10.1002/pen.11018
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X-ray diffraction methods and DSC thermal analysis have been used to investigate the structural change of nylon 6/clay nanocomposites. Nylon 6/clay has prepared by the intercalation of epsilon-caprolactam and then exfoliaton of the layered saponite or montmorillonite by subsequent polymerization. Both X-ray diffraction data and DSC results indicate the presence of polymorphism in nylon 6 and in nylon 6/clay nanocomposites. This polymorphic behavior is dependent on the cooling rate of nylon 6/clay nanocomposites from melt and the content of saponite or montmorillonite in nylon 6/clay nanocomposites. The quenching from the melt induces the crystallization into the gamma crystalline form. The addition of clay increases the crystallization rate of the alpha crystalline form at lower saponite content and promotes the heterophase nucleation of gamma crystalline form at higher saponite or montmorillonite content. The effect of thermal treatment on the crystalline structure of nylon 6/clay nanocomposites in the range between Tg and Tm is also discussed.
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