Structure of Nanoparticles Consisting of Poly(styrene) Shell and Poly(dimethylsiloxane) or Poly(5-(N,N-diethylamino) isoprene) Cores in Selective Solvents

M.D. NINAGO; A.J. SATTI; F.C. GIACOMELLI; I.C. RIEGEL; P. STEPÁNEK; C.L. PETZHOLD; A.E. CIOLINO; M.A. VILLAR; V. SCHMIDT; C. GIACOMELLI

Gramado, RS

Simposio; XII International Macromolecular Colloquium y 7th Internacional Symposium on Natural Polymers and Composites; 2010

Universidade Federal do Rio Grande do Sul

The internal structure of polystyrene(PS)-shell micelles having core-forming blocks consisting of poly(dimethylsiloxane) (PDMS) or poly(5-(N,N-diethylamino)isoprene)  (PAI) was determined in detail by accessing the multilevel structural organization using static and dynamic light scattering (SDLS) and small angle X-rays scattering (SAXS) techniques. Well-defined PS-b-PDMS and PS-b-PAI diblock copolymers with molar masses in the range of 12,000 to 18,200 g/mol were dispersed in cyclohexane, dimethylacetamide (DMAc) and dimethylformamide (DMF). Colloidal nanoparticles exhibiting either swollen core with large core surface area per corona chain that enable the PS chains to assume a random coil conformation with Gaussian statistics, or compact core and slightly stretched PS chains in the corona could be obtained.