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Structural studies on polymer whiskers by transmission electron microscopy: I. Morphological and high‐resolution observations
Author(s) -
Tosaka Masatoshi,
Yamakawa Masahiro,
Tsuji Masaki,
Kohjiya Shinzo,
Ogawa Tetsuya,
Isoda Seiji,
Kobayashi Takashi
Publication year - 1999
Publication title -
microscopy research and technique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 118
eISSN - 1097-0029
pISSN - 1059-910X
DOI - 10.1002/(sici)1097-0029(19990815/01)46:4/5<325::aid-jemt10>3.0.co;2-0
Subject(s) - whisker , crystallite , transmission electron microscopy , whiskers , materials science , orthorhombic crystal system , high resolution transmission electron microscopy , monomer , dark field microscopy , resolution (logic) , mica , electron microscope , crystallography , polymer , microscopy , crystal structure , chemistry , nanotechnology , composite material , optics , physics , artificial intelligence , computer science
Abstract The structures of poly( p ‐hydroxybenzoic acid) (PHBA) whisker crystals and crystalline fine fibrils of copolymer prepared from p ‐hydroxybenzoic acid (HBA) and 2‐hydroxy‐6‐naphthoic acid (HNA), namely poly(HBA/HNA) (monomer molar ratio: 97/3), were investigated by transmission electron microscopy (TEM). As for a PHBA whisker, microfibril‐like bright regions were recognized in the 210 dark‐field image. In the high‐resolution TEM image of another PHBA whisker, however, lattice fringes were continuous through the whisker, showing that the whisker is highly crystalline and almost perfect. On the other hand, in the high‐resolution images of poly(HBA/HNA) fine fibrils, granular crystallites (20– 40 nm in lateral dimension) were observed. The lattice fringes in the crystallites were not successfully indexed with the orthorhombic unit cells of the homopolymer crystal, suggesting the coexistence of another different structure as a minor component. Microsc. Res. Tech. 46:325–333, 1999. © 1999 Wiley‐Liss, Inc.