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Effect of center block structure on the physical and rheological properties of ABA block copolymers. Part II. Rheological properties
Author(s) -
Futamura Shingo,
Meinecke Eberhard A.
Publication year - 1977
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760170812
Subject(s) - copolymer , materials science , rheology , polybutadiene , polymer chemistry , ethylene , block (permutation group theory) , styrene , polystyrene , polymer science , composite material , polymer , chemistry , organic chemistry , catalysis , geometry , mathematics
The effect of the chemical structure of the center block on the rheological properties of ABA block copolymers with polystyrene end blocks has been investigated. The chemical structure of the center blocks investigated in the present paper are polybutadiene, polyisoprene, ethylene/butene copolymer, ethylene/propylene copolymer and polydimethyl‐siloxane. The chemical structure of the center block was found to have a pronounced effect on the rheological properties of the ABA block copolymer melts. The long range relaxation times of these block copolymer melts increases with increasing incompatibility between the styrene block and the center block. However, the rheological properties of the block copolymers are not influenced significantly by the glass transition or the entanglement molecular weight of the center block.