MORPHOLOGY OF POLY(ETHYLENE NAPHTHALENE-2,6-DICARBOXYLATE) - FIRST STAGES OF CRYSTALLIZATION

Citation
Fjb. Calleja et al., MORPHOLOGY OF POLY(ETHYLENE NAPHTHALENE-2,6-DICARBOXYLATE) - FIRST STAGES OF CRYSTALLIZATION, Journal of macromolecular science. Physics, B37(4), 1998, pp. 411-419
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Polymer Sciences
ISSN journal
0022-2348
Volume
B37
Issue
4
Year of publication
1998
Pages
411 - 419
Database
ISI
SICI code
0022-2348(1998)B37:4<411:MOPN-F>2.0.ZU;2-Z
Abstract
The morphology of poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) w ith a wide range of crystallinities has been determined by transmissio n electron microscopy (TEM). PEN thin films undergoing cold crystalliz ation during annealing at temperatures above T-g have been investigate d after selective chemical staining and cutting in an ultramicrotome. Crystallization appears in amorphous areas distributed in a noncrystal lizable matrix by formation of lamellae inside these amorphous areas. For low annealing temperatures (T-c similar to 145 degrees C), the eme rging morphology of PEN is seen prior to the occurrence of crystallini ty in the x-ray diffraction patten. With increasing time and temperatu re of crystallization, the number and thickness of lamellae increase, in accordance with increasing crystallinity and crystalline thickness, as determined by x-ray investigations. Dendritic superstructures are also observed with a rough starting internal structure that becomes fi ner with increasing crystallization time.