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Tailored rigid‐flexible block copolymers, 2 . Intrinsic viscosity behavior
Author(s) -
Cavalleri Piero,
Chavan Nayaku N.,
Ciferri Alberto,
Dell'Erba Carlo,
Novi Marino,
Marrucci Giuseppe,
Renamayor Carmen S.
Publication year - 1997
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/macp.1997.021980311
Subject(s) - copolymer , polymer chemistry , diluent , intrinsic viscosity , viscosity , macromolecule , materials science , block (permutation group theory) , chemistry , molecule , chemical engineering , polymer , organic chemistry , composite material , biochemistry , geometry , mathematics , engineering
The determination of single‐chain properties for heterogeneous molecules such as a rigid‐flexible block copolymer requires the use of solvents capable of reducing selective interactions involving the blocks and the diluent. Molecular dispersion is displayed by a two‐block copolymer of benzoyl‐terminated poly( p ‐benzamide) (poly(imino‐1,4‐phenyl‐enecarbonyl) and anilino‐terminated poly( m ‐phenyleneisophthalamide) in 96 wt.‐% sulfuric acid. For a series of such copolymers, intrinsic viscosities were measured avoiding degradation effects due to H 2 SO 4 . The intrinsic viscosity ([η]) of the copolymers was found to decrease with increasing length of the flexible block, but [η] remained larger than the value corresponding to an equimolar blend of rigid and flexible homopolymers. These results are explained by theoretical considerations within the framework of the hydrodynamic behavior of single rodlike and single coiled macromolecules.