A polystyrene- block -poly(1,2-butadiene)- block -poly( tert -butyl methacrylate) (SBT) triblock copolymer and its analogues with different degrees of saponification, SB(T/A) with A being poly(methacrylic acid) are characterized in terms of their morphologies and infrared spectroscopic features. The chemical modification of the third block leads to a change of the overall morphology from a gyroid to a lamellar structure. Blends of these SB(T/A) triblock copolymers with polystyrene- block -poly(2-vinylpyridine) (SV) diblock copolymer and poly(2-vinylpyridine)- block -poly(cyclohexyl methacrylate) (VC) diblock copolymer were prepared and characterized. Attractive segmental interactions through hydrogen bonds between A and V blocks have been monitored by infrared spectroscopy. Upon increasing the amount of proton donors, the amount of hydrogen bonds between A and V units also increased. Superlattices composed of the two block copolymers were obtained by casting films from a mixed solution of these block copolymers in tetrahydrofuran (THF) and were investigated by transmission electron microscopy (TEM). Varying the amount of hydrogen-bonding donors via controlled saponification of the SBT triblock copolymer lead to different superlattices in blends with SV and VC diblock copolymers.
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Jiang et al. (2003) studied this question.
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