Conformational study on the thermal transition of chitosan-g-poly(N-vinylcaprolactam) in aqueous solution

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• 作者：Daniel Fernández-Quiroz ; Álvaro González-Gómez…
• 关键词：Chitosan ; g ; poly(N ; vinylcaprolactam) ; Conformational transition ; Dynamic light scattering ; ζ ; potential ; Ionic strength and pH effect
• 刊名：Colloid & Polymer Science
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：294
• 期：3
• 页码：555-563
• 全文大小：783 KB
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• 作者单位：Daniel Fernández-Quiroz (1)
  Álvaro González-Gómez (2) (3)
  Jaime Lizardi-Mendoza (4)
  Blanca Vázquez-Lasa (2) (3)
  Francisco M. Goycoolea (4) (5)
  Julio San Román (2)
  Waldo M. Argüelles-Monal (1)
  
  1. CIAD – Guaymas, Carret. al Varadero Nacional km 6.6, 85480, Guaymas, SON, Mexico
  2. ICTP-CSIC, c/ Juan de la Cierva 3, 28006, Madrid, Spain
  3. CIBER, Health Institute Carlos III, c/ Monforte de Lemos 3-5, Pabellón 11, 28029, Madrid, Spain
  4. CIAD-Hermosillo, Carret. a la Victoria km 0.6, 83304, Hermosillo, SON, Mexico
  5. Westfälische Wilhelms Universität Münster; IBBP, Schlossgarten 3, 48149, Münster, Germany
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Physical Chemistry
  Soft Matter and Complex Fluids
  Characterization and Evaluation Materials
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1536

文摘

Conformational changes of the thermal transitions of chitosan-graft-poly(N-vinylcaprolactam) copolymers in aqueous solution were studied by varying of the length of the grafted poly(N-vinylcaprolactam) (PVCL) chains, as well as the ionic strength and the pH of the solution. The conformational properties of the copolymer were monitored by means of dynamic light scattering and ζ-potential measurements. A series of copolymers with defined molecular architecture were synthesized. Obtained results point out that hydrophobic hydration plays a crucial role on the solubility of this copolymer at neutral and slightly alkaline solutions. The evolution of the size of macromolecular aggregates indicates that, in the coil state, there is a monomodal distribution, passing through a bimodal distribution in the pre-transition region, just before the phase separation. The role of the charge of the copolymers on the cooperative transition is also analyzed. The phase transition of these amphiphilic copolymers shows a strong dependence on the ionic strength of the solution.