SINGLE-CHAIN SINGLE-CRYSTALS OF GUTTA-PERCHA

Citation
Lz. Liu et al., SINGLE-CHAIN SINGLE-CRYSTALS OF GUTTA-PERCHA, Journal of macromolecular science. Physics, B36(2), 1997, pp. 195-203
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Polymer Sciences
ISSN journal
0022-2348
Volume
B36
Issue
2
Year of publication
1997
Pages
195 - 203
Database
ISI
SICI code
0022-2348(1997)B36:2<195:SSOG>2.0.ZU;2-P
Abstract
Single-chain single crystals of gutta-percha have been observed by tra nsmission electron microscopy of atomizer-sprayed particles deposited from a very dilute solution in chloroform onto a carbon film which had a filter paper wetted with ethanol in contact with its under side. Se lected-area electron diffraction patterns of crystals having no defini te crystal profiles showed that the crystals were of the low-melting c rystalline form and that the chain segments in the single crystals wer e standing up from the substrate during crystallization. In cases of s ingle crystals showing sharply defined crystal profiles, electron diff raction patterns showed that they were neither of the low-melting form nor the high-melting form. The structure of this new crystalline modi fication needs further studies.