Structural and thermal study of mesomorphic dodecylammonium carrageenates

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:341

Article

Vincekovic, M.¹  Pustak, A.²  Tusek-Bozic, Lj.³  Liu, F.⁴  Ungar, G.⁴  Bujan, M.¹  Smit, I.²  Filipovic-Vincekovic, N.³ 

[1] Rudjer Boskovic Inst, Fac Agron, Dept Chem, Zagreb, Croatia

[2] Rudjer Boskovic Inst, Dept Chem Mat, Zagreb, Croatia

[3] Rudjer Boskovic Inst, Dept Phys Chem, Zagreb, Croatia

[4] Univ Sheffield, Dept Mat Engn, Sheffield, S Yorkshire, England

关键词: Dodecylammonium chloride;    Carrageenans;    Surfactant-polymer complexes;   

DOI  :  10.1016/j.jcis.2009.09.021

来源: Elsevier

【 摘 要 】

Structural characteristics and thermal stability of a series of dodecylammonium carrageenates formed by stoichiometric complexation of dodecylammonium chloride and differently charged carrageenans (kappa-, iota- and lambda-carrageenan, respectively) were investigated. IR spectral analysis confirmed the electrostatic and hydrogen bond interactions between the dodecylammonium and carrageenan species. X-ray diffraction experiments show increased ordering in the complexes compared to that in the parent carrageenans. Dodecylammonium carrageenates have a layer structure, in which a polar sublayer contains layers of carrageenan chains and a nonpolar sublayer consists of conformationally disordered dodecylammonium chains electrostatically attached to the carrageenan backbone. The major factor that determines the dodecylammonium carrageenate structure is cationic surfactant, while the carrageenans moiety plays a major role in determining thermal properties. (C) 2009 Elsevier Inc. All rights reserved.

【 授权许可】

Free