Chain Localization and Interfacial Thickness in Microphase-Separated Structures of Block Copolymers with Variable Composition Distributions
Chain Localization and Interfacial Thickness in Microphase-Separated Structures of Block Copolymers with Variable Composition Distributions
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DOI：
10.1021/ma061487k
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发表时间：
2006-10
期刊：
影响因子：
5.5
通讯作者：
Atsushi Noro;Masatoshi Okuda;Fumitake Odamaki;D. Kawaguchi;N. Torikai;A. Takano;Y. Matsushita
中科院分区：
文献类型：
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作者：
Atsushi Noro;Masatoshi Okuda;Fumitake Odamaki;D. Kawaguchi;N. Torikai;A. Takano;Y. Matsushita
通过中子反射率的测量，从分子水平上研究了AB两嵌段和BAB三嵌段共聚物的组成分布对微相分离结构的影响。采用活性阴离子聚合法合成了单分散的三嵌段聚苯乙烯-d8-聚2-乙烯基吡啶共聚物（DP）和三嵌段标记的三嵌段共聚物（PDP）以及未标记的三嵌段共聚物。选择性标记方法采用共混的共聚物的链段分布的研究，而标记的聚合物混合的界面研究。通过中子反射率测量，观察到散射长度密度分布的混合薄膜由旋涂和连续热退火。据证实，共混薄膜表现出简单的交替层状结构，观察与所观察到的散装试样的结构一致。长、短的局部化现象。
The effect of composition distribution on microphase-separated structures of AB diblock and BAB triblock copolymers was investigated at the molecular level by measurements of neutron reflectivity. Monodispersed three poly(styrene)-d8-block-poly(2-vinylpyridine) (DP) and three labeled triblock copolymers (PDP) and unlabeled counterparts were synthesized by a living anionic polymerization process designed to yield constant molecular weight with different volume fractions. The selective labeling method employs the blending of copolymers for a segmental distribution study while the labeled polymers are mixed for an interfacial study. Scattering length density profiles were observed by neutron reflectivity measurements for blended thin films produced by spin-coating and successive thermal annealing. It was confirmed that the blended thin films exhibit simple alternating lamellar structures, an observation consistent with the observed structures of bulk specimens. The localization phenomenon of longer and short...