Poly(tyrene-b-Tetrahydrofuran)/Clay Nanocomposites by Mechanistic Transformation

 Poly(tyrene-b-Tetrahydrofuran)/Clay Nanocomposites by Mechanistic Transformation, Z. Yenice, M. A. Tasdelen, A. Oral, C. Guler, Y. Yagci, J. Polym. Sci. Polym. Chem. Ed., 47, 2990-2997 (2009) DOI: 10.1002/pola.23332


Synthesis of poly(styrene-block-tetrahydrofuran) (PSt-b-PTHF) block copolymer
on the surfaces of intercalated and exfoliated silicate (clay) layers by mechanistic
transformation was described. First, the polystyrene/montmorillonite (PSt/
MMT) nanocomposite was synthesized by in situ atom transfer radical polymerization
(ATRP) from initiator moieties immobilized within the silicate galleries of the
clay particles. Transmission electron microscopy (TEM) analysis showed the existence
of both intercalated and exfoliated structures in the nanocomposite. Then, the
PSt-b-PTHF/MMT nanocomposite was prepared by mechanistic transformation from
ATRP to cationic ring opening polymerization (CROP). The TGA thermogram of the
PSt-b-PTHF/MMT nanocomposite has two decomposition stages corresponding to
PTHF and PSt segments. All nanocomposites exhibit enhanced thermal stabilities
compared with the virgin polymer segments. VVC 2009 Wiley Periodicals, Inc. J Polym Sci
Part A: Polym Chem 47: 2190–2197, 2009
Keywords: atom transfer radical polymerization (ATRP); block copolymers; cationic
polymerization; cationic ring opening polymerization; clay; mechanistic transformation;