Synthesis and morphological behavior of model linear and miktoarm star copolymers of 2-methyl-1,3-pentadiene and styrene

Anastasios Mavroudis, Apostolos Avgeropoulos, Nikolaos Hadjichristidis*, Edwin L. Thomas, David J. Lohse

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

Three linear diblock copolymers (PS-b-P2MP), two 3-miktoarm [PS(P2MP)2] copolymers, and two 4-miktoarm star copolymers [PS(P2MP)3] of styrene (S) and 2-methyl-1,3-pentadiene (2MP) were synthesized by anionic polymerization/high vacuum techniques and controlled chlorosilane chemistry. Molecular characterization of the samples was carried out by size exclusion chromatography (SEC), membrane osmometry (MO), low-angle laser light scattering (LALLS), and 1H NMR spectroscopy, and indicated a high degree of molecular and compositional homogeneity. All samples had approximately the same total M̄w (∼100 000), different compositions, and high 1,4-microstructure for the P2MP blocks. The morphological behavior was determined via transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and differential scanning calorimetry (DSC). The experimental results were compared with those found for PS/PI block copolymer systems and with Milner's theoretical prediction. Significant discrepancies were found. Also, it is the first time that two morphologies (lamellae/double gyroid) coexist in a neat material, and especially in a 4-miktoarm star copolymer.

Original languageEnglish (US)
Pages (from-to)1976-1983
Number of pages8
JournalChemistry of Materials
Volume15
Issue number10
DOIs
StatePublished - May 20 2003

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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