Article (Scientific journals)
Viscoelastic Properties of Immiscible Telechelic Polymer Blends: Effect of Acid-Base Interactions
Charlier, Paulette; Jérôme, Robert; Teyssié, Philippe et al.
1992In Macromolecules, 25 (10), p. 2651-2656
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Keywords :
Calorimetry; Chromatographic analysis--Size exclusion; Polyisoprenes; Polymerization--Anionic polymerization; Polystyrenes; Cole-Cole Plots; Differential Scanning Calorimetry; SAXS; Plastics blends
Abstract :
[en] When a telechelic polyisoprene (PIP) end-capped with tertiary amine groups is blended with an immiscible telechelic polystyrene (PS) terminated with either sulfonic or carboxylic acid functions, a proton transfer occurs from the acid to the amine end groups. Viscoelastic properties of these blends support the formation of either ammonium sulfonate or ammonium carboxylate linkages between PS and PIP in a manner analogous to block copolymerization. Due to the low stability of ammonium carboxylates, the related polyblends have been investigated up to 100 °C and they show Tg of each polymeric partner. When PS and PIP chain ends are associated through more thermally stable ammonium sulfonates, the thermal dependences of storage and loss shear moduli show two additional relaxation processes at least in some range of PSand PIP molecular weights. By analogy with SAXS analysis of similar polyblends, these relaxations have been assigned to a classic order-disorder transition similar to that seen in traditional block copolymers and to the irreversible dissociation of the sulfonate salts at higher temperatures, respectively. These additional transitions which involve a change in phase morphology have been confirmed by the “Cole-Cole” log G″ vs log G′ plots. © 1992, American Chemical Society. All rights reserved.
Disciplines :
Chemistry
Author, co-author :
Charlier, Paulette ;  Université de Liège - ULiège > Département des sciences de la vie > Cristallographie des macromolécules biologiques
Jérôme, Robert ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Teyssié, Philippe ;  Université de Liège - ULiège > Relations académiques et scientifiques (Sciences)
Utracki, L. A.;  Industrial Materials Research Institute, National Research Council of Canada, Boucherville, Québec, J4B 6Y4, Canada
Language :
English
Title :
Viscoelastic Properties of Immiscible Telechelic Polymer Blends: Effect of Acid-Base Interactions
Publication date :
1992
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
American Chemical Society, United States - District of Columbia
Volume :
25
Issue :
10
Pages :
2651-2656
Peer reviewed :
Peer Reviewed verified by ORBi
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