Self-Assembly in a Mixture of Two Poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) Copolymers in Water

Journal of Colloid and Interface Science
D ZhouAli Khan

Abstract

The self-assembly behavior in water of a mixture of two poly (ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) copolymers, (EO)13(PO)30(EO)13 (L64) and (EO)37(PO)58(EO)37 (P105), was explored at 25°C. The phase boundaries were established using 2H-NMR and inspection under polarized light; the structure of the various lyotropic liquid crystalline (LLC) phases was determined with small-angle X-ray scattering, while viscosity and differential scanning calorimetry measurements were used to probe the isotropic water-rich solution region. Isotropic regions, similar to the neat polymers, are stable at high polymer content. The addition of water induces structure in the amphiphilic block copolymer system. An extended lamellar (D) LLC phase is formed at 20-25% water content; a hexagonal (E) and a cubic (I) LLC phases supersede D at higher water contents. In addition to the above, a narrow isotropic region (L') is observed on the L64-water binary axis, in equilibrium with the E and the D phases. The hexagonal and lamellar LLC phases extended all the way from the L64-rich to the P105-rich side of the ternary L64-P105-water phase diagram; the characteristic hexagonal and lamellar structural dimensions varied linearly with...Continue Reading

Citations

Sep 28, 2018·Expert Opinion on Drug Delivery·Andrew M Bodratti, Paschalis Alexandridis
Jan 3, 2016·Journal of Colloid and Interface Science·Kazuhiro Kaizu, Paschalis Alexandridis
Aug 7, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Chiraphon ChaibunditColin Booth
Dec 19, 2014·The Journal of Physical Chemistry. B·Ammu PrhashannaShing Bor Chen
Mar 9, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Cornelia SommerVasil M Garamus
Mar 16, 2007·Bioconjugate Chemistry·Tatiana Segura, Jeffrey A Hubbell
May 19, 2006·The Journal of Physical Chemistry. B·R GangulyS K Kulshreshtha

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