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Intermacromolecular Complexation due to Specific Interactions, 14. The Chain Architectural Effect of Block Ionomers on Complexation
Author(s) -
Zhang Guangzhao,
Jiang Ming,
Wu Chi
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(20010601)202:9<1750::aid-macp1750>3.0.co;2-5
Subject(s) - polymer chemistry , polystyrene , glass transition , materials science , ionomer , tetrahydrofuran , copolymer , styrene , block (permutation group theory) , chemical engineering , chemistry , polymer , composite material , organic chemistry , geometry , mathematics , solvent , engineering
Series of diblock and triblock ionomers based on carboxylated polystyrene‐ block ‐poly(ethylene‐ co ‐propylene) (CSEP) and carboxylated polystyrene‐ block ‐poly(ethylene‐ co ‐butylene)‐ block ‐styrene) (CSE‐BS), i. e., the zinc salts of diblock ZnCSEP and triblock ZnCSEBS were prepared and, respectively, mixed with poly[(butyl methacrylate)‐ co ‐(4‐vinylpyridine)] (BVP) in tetrahydrofuran (THF). It was found that ZnCSEBS/BVP blend solutions exhibit enhanced viscosities and increasing hydrodynamic radii with narrowing distributions in solution, as well as improved glass transition temperature ( T g ) of the ionomeric polystyrene (PS) blocks in bulk, which indicates complexation between ZnCSEBS and BVP chains. In contrast, ZnCSEP/BVP blends show viscosities and hydrodynamic radii close to the values calculated from the additivity law, and invariable T g s of two blocks of ZnCSEP, suggesting that ZnCSEP can not form complexes with BVP. This architectural effect of the block ionomers on their complexation behavior has been interpreted in terms of the difference in structural characters of the associations of the diblock and triblock ionomers in solutions formed due to the aggregation of the ionic groups.