Characterization of low molecular mass thermosensitive diblock copolymers and their self-assembly by means of analytical ultracentrifugation

  • Alvaro Ortega /
  • Ramón Pamies /
  • Kaizheng Zhu /
  • Anna Lena Kjøniksen /
  • Bo Nyström /
  • José García De La Torre
Journal ar
Colloid and Polymer Science
  • Volumen: 290
  • Número: 4
  • Fecha: 01 February 2012
  • Páginas: 297-306
  • ISSN: 0303402X 14351536
  • Source Type: Journal
  • DOI: 10.1007/s00396-011-2542-5
  • Document Type: Article
The characterization of a series of four poly(N-isopropylacrylamide)-based copolymers with a hydrophilic block of poly(ethylene glycol) with a variable length (MPEG n -b-PNIPAAM 71) has been performed by means of analytical ultracentrifugation. Molecular mass, partial specific volume, sedimentation coefficient (s), and hydrodynamic radius (R h) have been determined and successfully compared with other techniques. In addition, the self-assembly process of these four copolymers has been evaluated, finding multimeric species at temperatures lower than low critical solution temperature in the case of the longest copolymer. © 2011 Springer-Verlag.

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