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Studies on the molecular flexibility of novel dendronized carboxymethyl cellulose derivatives

Pohl, M., Morris, Gordon, Harding, S. E. and Heinze, T. (2009) Studies on the molecular flexibility of novel dendronized carboxymethyl cellulose derivatives. European Polymer Journal, 45 (4). pp. 1098-1110. ISSN 0014-3057

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Water-soluble deoxy-azido cellulose derivatives were synthesized by heterogeneous carboxymethylation, applying 2-propanol/aqueous NaOH as slurry medium. The novel, carboxymethyl deoxy-azido cellulose provides a convenient starting material for the selective dendronization of cellulose via the copper-catalyzed Huisgen reaction yielding water-soluble carboxymethyl 6-deoxy-(1-N-[1,2,3-triazolo]-4-polyamidoamine) cellulose derivatives of first (degree of substitution, DS 0.51), second (DS 0.44) and third generation (DS 0.39). The novel biopolymer derivatives were characterized by FT-IR and NMR spectroscopy, intrinsic viscosity, sedimentation coefficient and weight average molar mass. Solution conformation and flexibility were estimated qualitatively using conformation zoning and quantitatively (persistence length) using the combined global method. Sedimentation conformation zoning showed a semi-flexible coil conformation and the global method applied to each carboxymethyl deoxy-azido cellulose and carboxymethyl 6-deoxy-(1-N-[1,2,3-triazolo]-4-polyamidoamine) cellulose derivative yielded persistence length all within the range of 2.8-4.0 nm with no evidence of any change in flexibility with dendronization. © 2009 Elsevier Ltd. All rights reserved.

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Item Type: Article
Uncontrolled Keywords: Cellulose Conformation analysis Dendronization Dendronized cellulose Polysaccharides Ultracentrifugation Biopolymers Cellulose derivatives Centrifugation Dendrimers Dielectric relaxation Land use Nuclear magnetic resonance spectroscopy Polymers Synthesis (chemical) Zoning Carboxy methyl cellulose Carboxymethyl Carboxymethylation Degree of substitutions Flexible coils Global methods Intrinsic viscosities IR and NMR spectroscopies Molecular flexibilities Persistence lengths Polyamidoamine Sedimentation coefficients Solution conformations Starting materials Third generations Carboxymethyl Cellulose Flexibility Molecular Structure Nuclear Magnetic Resonance Relaxation Sedimentation
Subjects: Q Science > QD Chemistry
Schools: School of Applied Sciences
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Depositing User: Gordon Morris
Date Deposited: 18 Sep 2012 13:13
Last Modified: 28 Aug 2021 20:32

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