Solvent-Induced Association of Polymers: Clustering and Network Formation

[img]PDF - Authorized users only
Language: English
180Kb
Title:Solvent-Induced Association of Polymers: Clustering and Network Formation
Creators:
Pouchlý, Julius
Živný, Antonín
Sikora, Antonín
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 70, 12, pp. 1987-2013
Uncontrolled Keywords:Polymer association theory, Two gel points, Sol-gel relationships, Solvent-complexed chain junctions, Functional group association equilibrium, Multiple chain junctions

Abstract

A thermodynamic treatment of a random, solvent-assisted association of polyfunctional macromolecules is developed. In the model proposed, a multiple association junction connecting <i>m</i> primary chains consists of <i>m</i> polymer functional groups with <i>bm</i> solvent molecules incorporated. Using Veytsman's procedure, basic thermodynamic functions and association equilibrium relations are derived. Different association characteristics are examined. When passing from a system with solvent-free junctions (<i>b</i> = 0) to our model with <i>b</i> &gt; 0, the shape of the calculated curves changes strikingly, e.g. the relative association degree α vanishes both in the neat solvent and neat polymer points, showing a maximum near the middle of the composition range. This results in the existence of two critical points of network formation (gel points), delimitating the compositional range of the coexistence of a network with finite clusters (gel region). Using extinction probability, the quantitative parameters characterizing the cluster-network relationships are calculated and analyzed. All of them display an extreme near the middle of the gel region, and various kinds of singularities appear in the two gel points. The effect of the stoichiometric ratio <i>b</i> on characteristic system parameters is discussed. <p>

Title:Solvent-Induced Association of Polymers: Clustering and Network Formation
Creators:
Pouchlý, Julius
Živný, Antonín
Sikora, Antonín
Uncontrolled Keywords:Polymer association theory, Two gel points, Sol-gel relationships, Solvent-complexed chain junctions, Functional group association equilibrium, Multiple chain junctions
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:12
Page Range:pp. 1987-2013
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20051987UNSPECIFIED
ID Code:2451
Item Type:Article
Deposited On:06 Feb 2009 17:18
Last Modified:06 Feb 2009 16:18

Citation

Pouchlý, Julius; Živný, Antonín; Sikora, Antonín (2005) Solvent-Induced Association of Polymers: Clustering and Network Formation. Collection of Czechoslovak Chemical Communications, 70 (12). pp. 1987-2013. ISSN 0010-0765

Repository Staff Only: item control page