Volume 49, Issue 19 pp. 4292-4305
Article

Synthesis, molecular, and morphological characterization of initial and modified diblock copolymers with organic acid chloride derivatives

Nikolaos Politakos

Nikolaos Politakos

Polymers' Laboratory, Department of Materials Science & Engineering, University of Ioannina, University Campus, Ioannina 45110, Greece

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Craig J. Weinman

Craig J. Weinman

Department of Materials Science & Engineering, Cornell University, Ithaca, New York 14853-1501

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Marvin Y. Paik

Marvin Y. Paik

Department of Materials Science & Engineering, Cornell University, Ithaca, New York 14853-1501

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Harihara S. Sundaram

Harihara S. Sundaram

Department of Materials Science & Engineering, Cornell University, Ithaca, New York 14853-1501

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Christopher K. Ober

Corresponding Author

Christopher K. Ober

Department of Materials Science & Engineering, Cornell University, Ithaca, New York 14853-1501

Christopher K. Ober, Department of Materials Science & Engineering, Cornell University, Ithaca, New York 14853-1501

Apostolos Avgeropoulos, Polymers' Laboratory, Department of Materials Science & Engineering, University of Ioannina, University Campus, Ioannina 45110, Greece

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Apostolos Avgeropoulos

Corresponding Author

Apostolos Avgeropoulos

Polymers' Laboratory, Department of Materials Science & Engineering, University of Ioannina, University Campus, Ioannina 45110, Greece

Christopher K. Ober, Department of Materials Science & Engineering, Cornell University, Ithaca, New York 14853-1501

Apostolos Avgeropoulos, Polymers' Laboratory, Department of Materials Science & Engineering, University of Ioannina, University Campus, Ioannina 45110, Greece

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First published: 22 July 2011
Citations: 16

Abstract

Six well defined PS-b-PB1,2 diblock copolymers (PS: polystyrene and PB: polybutadiene) with almost 100% of 1,2 microstructure for the PB segment were synthesized. Size exclusion chromatography (SEC), membrane osmometry (MO) and proton nuclear magnetic resonance spectroscopy (1H NMR) were used for verification of the molecular characteristics and the 100% -1,2 addition for the PB blocks. Modification with heptanoyl or pentadecafluorooctanoyl chloride was accomplished via hydroboration and subsequent oxidation, leading to hydroxylated PB blocks and was verified with 1H NMR and Fourier transform infrared (FTIR) spectroscopy. Only two samples were modified with both organic acid chloride derivatives. Structural characterization was accomplished via transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS) in all cases. The self-assembly was more evident in the modified copolymers with the corresponding halides due to the increase of the molecular weight of the modified PB block. Taking into consideration the χN values in each case and comparing the results with those of PS-b-PI copolymers already reported in the literature the discrepancies with the theoretical predictions are very small or minimal. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011

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