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Crystallization Behavior and Morphology of Poly(ethylene 2,6-Naphthalate) by Wan Duk Lee; Eui Sang Yoo; Seung Soon Im is a Materials Science article available to read on EtoBox.

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The crystallization behavior and morphology of poly(ethylene 2,6-naphthalte) (PEN) were investigated by means of differential scanning calorimetry (DSC), polarized optical microscopy (POM) and transmission electron microscopy (TEM). POM results revealed that PEN crystallized at 240 8C shows the coexistence of a and b-form spherulite morphology with different growth rates. In particular, when PEN crystallized at 250 8C, the morphology of spherulites showed a squeezed peanut shape. The Avrami exponents decreased from 3 to 2.8 above the crystallization temperature of 220 8C, indicating a decrease in growth dimension. Analysis from the secondary nucleation theory suggests that PEN crystallized at 240 8C has crystals with both regime I and regime II. In TEM observation, the ultra-thin PEN film crystallized at 200 8C showed the spherulitic texture with characteristic diffractions of a-form, while PEN crystallized at 240 8C generated an axialite structure with only b-form diffraction patterns. In addition, despite a long crystallization time of 24 h, amorphous regions were also observed in the same specimen. It was inferred that the initiation of PEN at 240 8C generates only b-form crysta

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Author

Wan Duk Lee; Eui Sang Yoo; Seung Soon Im

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

2003

Language

EN

Field

Materials Science (Physical Sciences)