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Water-Insoluble Complexes of Poly(L-Lysine) with Mixed Alkyl Sulfates: Composition-Controlled Solid State Structures

Ponomarenko, Ekaterina A. and Tirrell, David A. and MacKnight, William J. (1998) Water-Insoluble Complexes of Poly(L-Lysine) with Mixed Alkyl Sulfates: Composition-Controlled Solid State Structures. Macromolecules, 31 (5). pp. 1584-1589. ISSN 0024-9297. http://resolver.caltech.edu/CaltechAUTHORS:PONm1998

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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 alkane-type 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 β-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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ma971388uDOIArticle
http://pubs.acs.org/doi/abs/10.1021/ma971388uPublisherArticle
ORCID:
AuthorORCID
Tirrell, David A.0000-0003-3175-4596
Additional Information:Copyright © 1998 American Chemical Society. Received September 19, 1997; Revised Manuscript Received January 2, 1998. Publication Date (Web): February 20, 1998.
Record Number:CaltechAUTHORS:PONm1998
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:PONm1998
Official Citation:Water-Insoluble Complexes of Poly(l-Lysine) with Mixed Alkyl Sulfates:  Composition-Controlled Solid State Structures Ekaterina A. Ponomarenko, David A. Tirrell, and William J. MacKnight Macromolecules 1998 31 (5), 1584-1589
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53437
Collection:CaltechAUTHORS
Deposited By: Anne Hormann
Deposited On:01 Feb 2015 04:41
Last Modified:01 Feb 2015 04:41

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