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Polystyrene–Polyperfluorooctylethyl acrylate Diblock Copolymers: The Effect of Dilution of the Fluorinated Mesogenic Chains on Bulk and Surface Properties
Author(s) -
Martinelli Elisa,
Fantoni Chiara,
Gallot Bernard,
Glisenti Antonella,
Galli Giancarlo
Publication year - 2010
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201051041
Subject(s) - copolymer , materials science , polymer chemistry , mesogen , acrylate , mesophase , contact angle , polymerization , polystyrene , thermoplastic elastomer , elastomer , wetting , polymer , chemical engineering , composite material , liquid crystal , liquid crystalline , optoelectronics , engineering
Summary : Three smectic poly(styrene‐ b ‐perfluorooctylethyl acrylate) block copolymers (S‐ b ‐AF8) with different degrees of polymerization ( n , m ) of the relative blocks were synthesized by atom transfer radical polymerization (S, n = 25; AF8 m = 2, 6, 23). The mesophase structure and transition temperatures were investigated by DSC and WAXD. The block copolymer having the shortest fluorinated block was blended with a thermoplastic elastomer SEBS in different proportions, in order to look at the effect of a further dilution of the perfluorinated groups on non‐wetting properties. Thin films of the block copolymers as well as the blends exhibited large contact angles with both water and n ‐hexadecane, which resulted in low solid surface tensions. XPS findings at different photoemission angles confirmed the effective surface segregation of the mesogenic chains of the fluorinated polymer block.