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Poly(oxyethylene)s terminated at both ends with phosphonium ion end groups, 2 . Properties
Author(s) -
Kubisa Przemysław,
Biedroń Tadeusz
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970103
Subject(s) - polymer chemistry , phosphonium , chemistry , differential scanning calorimetry , glass transition , intrinsic viscosity , ionic bonding , end group , viscosity , polymerization , chloroform , polymer , ion , materials science , organic chemistry , thermodynamics , physics , composite material
Poly(oxyethylene)s with number‐average degrees of polymerization (DP n ) ranging from ≈ 6 to ≈ 80, terminated at both ends with phosphonium ion end groups (diionic poly‐EO), have been prepared and characterized as described in the preceding paper. Viscosities of diionic poly‐EO were measured, both in solution and in bulk. In chloroform solution, at low concentration (< 1 g/100 mL), the viscosity of diionic poly‐EO was lower than the viscosity of nonionic (terminated with HO‐groups) poly‐EO of the same DP n . At higher concentrations, the viscosity of diionic poly‐EO exceeded that of nonionic poly‐EO and increased sharply with increasing concentration. At the constant weight concentration of ≈4 g/100 mL, the viscosities of short‐chain diionic poly‐EO were higher and those of longer chain diionic poly‐EO were lower than the viscosities of the nonionic poly‐EO of the same chain lengths. These results were attributed to a predominant intramolecular aggregation of terminal ionic groups at low concentration of ionic groups in solution and predominant intermolecular aggregation at higher concentration of ionic groups. The results of bulk viscosity measurements as well as the results of differential scanning calorimetry measurements of the dependence of the glass transition temperature on the DP n of diionic poly‐EO indicated that in bulk physically cross‐linked networks were formed, due to intermolecular aggregation of terminal ionic groups.