Premium
Amphiphilic Block Copolymers with Pendent Sugar as Hydrophilic Segments and Their Surface Properties
Author(s) -
Chen Yongming,
Wulff Günter
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20011101)202:17<3273::aid-macp3273>3.0.co;2-8
Subject(s) - copolymer , polystyrene , polymer chemistry , amphiphile , contact angle , materials science , styrene , radical polymerization , polymerization , adsorption , chemistry , chemical engineering , polymer , organic chemistry , composite material , engineering
The block copolymers of styrene ( St ) and 2,3;4,5‐diisopropylidene‐1‐(4‐vinylphenyl)‐ D ‐gluco( D ‐manno)pentitol ( 1 ) were prepared by TEMPO‐mediated free‐radical polymerization. The polystyrene‐bearing TEMPO fragment at the chain end was used as the macromolecular initiator for 1 , and the poly1 ‐bearing TEMPO fragment at the chain end was used as the initiator for St . Corresponding amphiphilic block copolymers were produced after removing isopropylidene by treating the samples with trifluoroacetic acid and water (9/1, v/v). The surface properties of the cast films on silanized glass substrates from N,N ‐dimethylformamide solutions were characterized by contact‐angle analysis. The results show that the surface properties of the as‐cast films are hydrophobic and became hydrophilic when the films were treated with hot water. This suggests that the structures of the outermost surface could be reorganized according the treating conditions. The relatively longer polystyrene segments in the copolymers seem to increase the ability of the domain to reconstruct. The adsorption of the novel amphiphilic block copolymers on a polystyrene plate was also studied by the contact‐angle method. It was found that the surface quickly became hydrophilic simply by spreading a low concentration of an aqueous solution of the copolymer on the substrate.