STUDY OF ENTANGLED NETWORK FORMATION IN CONCENTRATED-SOLUTIONS OF POLYMER BY C-13 NMR

Authors
MAO SH NI SR DU YR SHEN LF
Citation
Sh. Mao et al., STUDY OF ENTANGLED NETWORK FORMATION IN CONCENTRATED-SOLUTIONS OF POLYMER BY C-13 NMR, Science in China. Series B, Chemistry, life sciences & earth sciences, 39(2), 1996, pp. 187-191
Citations number
8
Categorie Soggetti
Chemistry
Journal title
Science in China. Series B, Chemistry, life sciences & earth sciences → ACNP
ISSN journal
1001652X
Volume
39
Issue
2
Year of publication
1996
Pages
187 - 191
Database
ISI
SICI code
1001-652X(1996)39:2<187:SOENFI>2.0.ZU;2-A
Abstract
Information about the exact location of topological and cohesional ent anglements at molecular level has been obtained by C-13 NMR relaxation analysis. The results show that about 20% of the carbon atonis in the main chain are entangled in the 25% (by weight) solution, which is in dependent of the content of the 1,2-segment in polybutadiene and of th e kind of solvent. However, the entanglement of the carbon atoms on th e end group of the side chain is very weak, they behave as slipping fr eely at the junctions.