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Miscibility and morphology of AB/C‐type blends composed of block copolymer and homopolymer or random copolymer, 1. Polyisoprene‐ block ‐poly(methyl methacrylate)/modified polystyrene blends
Author(s) -
Jiang Ming,
Huang Tianzi,
Xie Jingwei
Publication year - 1995
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.1995.021960309
Subject(s) - miscibility , polymer chemistry , copolymer , materials science , polystyrene , methyl methacrylate , tetrahydrofuran , solvent , poly(methyl methacrylate) , hydrogen bond , methylcyclohexane , polymer blend , chemical engineering , polymer , chemistry , toluene , organic chemistry , molecule , composite material , engineering
The miscibility and morphology of AB/C‐type blends composed of polyisoprene‐ block ‐poly(methyl methacrylate) [PI‐ b ‐PMMA] and a modified polystyrene with hydroxyl‐containing units [PS(OH)] has been studied by transmission electron microscopy (TEM). In the blends the density of hydrogen bonding between C and B block is adjustable. The miscibility and morphology of the blends cast from toluene, which is inert to hydrogen bonding, are found to depend on the hydroxyl content in PS(OH). Immiscibility between PMMA blocks and PS(OH) alters to miscibility when the hydroxyl content in PS(OH) reaches 1,6 mol‐%. Little effect of the relative molecular weight of PS(OH) to that of the PMMA block is found, which is different from that for AB/A‐type blends. An apparent effect of the casting solvent on the miscibility and morphology is observed. Being a proton‐acceptor solvent, tetrahydrofuran (THF) considerably decreases the miscibility, and a homogeneous microphase structure appears only when the hydroxyl content reaches 10 mol‐%. This implies that the main driving force for the miscibility between PS(OH) and PMMA blocks is hydrogen bonding between hydroxyl groups of PS(OH) and carbonyl groups of PMMA.