Unperturbed Dimensions of Atactic Poly(phenylacetylene)

[img]PDF - Authorized users only
Language: English
122Kb
Title:Unperturbed Dimensions of Atactic Poly(phenylacetylene)
Creators:
Rédrová, Dana
Sedláček, Jan
Žigon, Majda
Vohlídal, Jiří
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 70, 11, pp. 1787-1798
Uncontrolled Keywords:Unperturbed dimensions, Polymers, Conformation analysis, Polyvinylenes, Scaling law, Radius of gyration, Polyphenylacetylene, Polyacetylenes

Abstract

Dilute solution characteristics of atactic (ca. 30% <i>trans</i>) poly(phenylacetylene), PPA, were determined by using the SEC/MALS technique in order to obtain a deeper insight into discrepancy between presumed rigidity of conjugated polyvinylene molecules and their random-coil behavior in solutions resulting from earlier viscometry measurements. PPA was found to exhibit the molecular-weight dependence of the radius of gyration in tetrahydrofuran solution similar to that of atactic polystyrene (saturated analogue of PPA); also unperturbed dimensions of these polymers are almost equal. This rather surprising observation is explained as a consequence of the increased π-π attraction between highly polarizable PPA segments with well-delocalized π-electrons, which compensates the effect of stiffening of these segments due to conjugation. Possible influence of chain branching is also discussed. <p>

Title:Unperturbed Dimensions of Atactic Poly(phenylacetylene)
Creators:
Rédrová, Dana
Sedláček, Jan
Žigon, Majda
Vohlídal, Jiří
Uncontrolled Keywords:Unperturbed dimensions, Polymers, Conformation analysis, Polyvinylenes, Scaling law, Radius of gyration, Polyphenylacetylene, Polyacetylenes
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:70
Number:11
Page Range:pp. 1787-1798
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20051787UNSPECIFIED
ID Code:2439
Item Type:Article
Deposited On:06 Feb 2009 17:18
Last Modified:06 Feb 2009 16:18

Citation

Rédrová, Dana; Sedláček, Jan; Žigon, Majda; Vohlídal, Jiří (2005) Unperturbed Dimensions of Atactic Poly(phenylacetylene). Collection of Czechoslovak Chemical Communications, 70 (11). pp. 1787-1798. ISSN 0010-0765

Repository Staff Only: item control page