On the internal morphologies of high-modulus polyethylene and polypropylene fibres

Citation
Mia. El-maaty et al., On the internal morphologies of high-modulus polyethylene and polypropylene fibres, J MATER SCI, 34(9), 1999, pp. 1975-1989
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF MATERIALS SCIENCE
ISSN journal
0022-2461 → ACNP
Volume
34
Issue
9
Year of publication
1999
Pages
1975 - 1989
Database
ISI
SICI code
0022-2461(19990501)34:9<1975:OTIMOH>2.0.ZU;2-Z
Abstract
High modulus polyethylene fibres, both melt and gel-spun, contain the same longitudinal density deficient regions, revealed by permanganic etching, as were found in specimens of the same fibres after treatment by the Leeds hi gh temperature compaction process. For these materials a new model of fibre structure is proposed, which develops as a consequence of nucleation on an extended network of entangled molecules permeating the fibres. Subsequent growth into spaces between the network will encounter stresses due to the c ontraction on crystallization leading to distributed density deficient regi ons of high free volume. Each of the four commercial PE fibres examined dif fers from the others in its characteristic outline and the details of its i nternal substructure. The structure of commercial polypropylene fibres is a lso compared. (C) 1999 Kluwer Academic Publishers.