Article
Water-Insoluble Complexes of Poly(L-Lysine) with Mixed Alkyl Sulfates: Composition-Controlled Solid State Structures
Macromolecules
(1998)
Abstract
Structures of the water-insoluble complexes of poly(L-lysine) with octyl and octadedecyl
sulfates, and with the mixtures of these surfactants, were examined via X-ray diffraction, infrared
spectroscopy, and differential scanning calorimetry. The solid-state structures of the complexes were
shown to be governed by their compositions. In the stoichiometric poly(L-lysine) complex with octadecyl
sulfate, surfactant chains crystallize on a hexagonal lattice. In the poly(L-lysine)-octyl sulfate complex
of nearly stoichiometric composition, the surfactants are arranged on an alkane-type two-dimensional
lattice. In the complex with 20 mol % octadecyl sulfate and about 75 mol % octyl sulfate, the longer
surfactant chains form hexagonal crystalline blocks, and the shorter chains are arranged on an alkanetype
two-dimensional lattice. In the poly(L-lysine) complex with 10 mol % octadecyl sulfate and about 85
mol % octyl sulfate, all surfactant chains are arranged on a two-dimensional alkane-type lattice. All
complexes are organized in lamellar structures consisting of layers of poly(L-lysine) chains in /J-sheet
conformations, separated by layers of surfactants. Complexes with crystalline and partially crystalline
surfactants adopt lamellar structures with identical long periods and with interdigitated octadecyl chains.
Complexes with two-dimensional order in the surfactant arrangement also adopt lamellar structures
with identical long periods and with octyl chains packed tail to tail.
Keywords
- Water-Insoluble Complexes,
- Poly(L-Lysine),
- Mixed Alkyl Sulfates,
- Composition-Controlled,
- Solid State Structures
Disciplines
Publication Date
1998
Citation Information
William MacKnight, Ekaterina A. Ponomarenko and David A Tirrell. "Water-Insoluble Complexes of Poly(L-Lysine) with Mixed Alkyl Sulfates: Composition-Controlled Solid State Structures" Macromolecules Iss. 31 (1998) p. 1584 - 1589 Available at: http://works.bepress.com/william_macknight/261/