SELF-ASSEMBLY VIA A COMPLEX PHASE-TRANSITION IN MIXTURES OF POLYSTYRENE-BLOCK-POLYBUTADIENE BLOCK-COPOLYMER AND POLY(METHYL VINYL ETHER)

被引:15
作者
HASHIMOTO, T [1 ]
IZUMITANI, T [1 ]
OONO, K [1 ]
机构
[1] DAICEL CHEM IND LTD,RES CTR,ABOSHI KU,HIMEJI,HYOGO 67112,JAPAN
关键词
D O I
10.1002/masy.19950980182
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The self-assembly of a binary mixture of polystyrene-block-polybutadiene (SB) and poly(methyl vinyl ether) (PVME) was studied by transmission electron microscopy and time-resolved light scattering. The self-assembly studied involved first microphase separation, in which a microdomain structure composed of polybutadiene block chains (PB) was formed in a matrix composed of polystyrene block chains (PS) and PVME homopolymers, and subsequently macrophase separation of the PVME from the microdomain phase of SB. The microphase separation was induced in a film preparation process using a solution cast method at room temperature. The macrophase separation was induced by rapidly heating the film specimens to above a critical temperature where PVME and PS undergo spinodal decomposition (SD). This complex phase transition, involving microphase separation followed by macrophase separation, was found to generate a superlattice structure (or a modulated structure) with two characteristic spacings: Lambda(macro) associated with the SD and Lambda(micro) associated with the microphase separation, both being generally time-dependent. The growth of the ''macrodomains'' was found to be pinned at Lambda(macro) approximate to 840 nm due to the elastic effect of the microdomain structure. The microdomain structure with Lambda(micro) approximate to 57 nm was found to undergo a morphological transition (a transition between two ordered phases of block copolymers) as a consequence of the local composition change of the two polymers induced by the SD.
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页码:925 / 949
页数:25
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