Synthesis and solid state structures of macromolecular cylindrical brushes with varying side chain length

• Published in: Polymer (Guilford) 2004-05, Vol.45 (12), p.4009-4015
• Main Authors: Zhang, Bin, Zhang, Shanju, Okrasa, Lidia, Pakula, Tadeusz, Stephan, Tim, Schmidt, Manfred
• Format: Article
• Language: English
• Subjects: Applied sciences; Comb-like polymers; Exact sciences and technology; Macromolecular brushes; Organic polymers; Physicochemistry of polymers; Properties and characterization; Structure, morphology and analysis; X-ray scattering
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2004.04.012

Cylindrical brushes with a macromolecular backbone and well-defined side chains of different length (4≤ P n sc≤38) were synthesized by polymerization of macromonomers. The effect of side chain length on the intermolecular order has been investigated by means of X-ray scattering on the melt-extruded samples. The increase of the side chain molar mass results in an increase of the intermolecular distance d according to d∼( M n sc) 0.476. The contour length of the cylindrical brush polymers per main chain monomer unit, l m, was determined to slightly vary with side chain molar mass M n sc according to l m∼( M n sc) 0.059. The resulting values are much less than the maximum extension, l m =0.25 nm, which is found to be almost independent of side chain molar mass. Also, supermolecular structure formation of a random copolymer brush prepared by radical copolymerization of methacryloyl end functionalized polyvinylpyridine and polymethylmethacrylate macromonomers has been observed and is interpreted as a consequence of intramolecular phase separation.