DISTRIBUTIONS OF CHAIN ENDS AND JUNCTION POINTS IN ORDERED BLOCK COPOLYMERS
DISTRIBUTIONS OF CHAIN ENDS AND JUNCTION POINTS IN ORDERED BLOCK COPOLYMERS
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DOI：
10.1021/ma00057a026
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发表时间：
1993-03-01
期刊：
影响因子：
5.5
通讯作者：
MAJKRZAK, CF
中科院分区：
文献类型：
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作者：
MAYES, AM;JOHNSON, RD;MAJKRZAK, CF
用中子反射率法研究了有序对称聚(苯乙烯-甲基丙烯酸乙酯)两嵌段共聚物的链构型。在薄膜几何结构中，共聚物组织成平行于衬底表面的层状微区。共聚物的合成是在链的末端或中心有少量的氢化链段。这种选择性标记允许表征垂直于薄膜平面的链端和连接点的空间分布。从反射率分析发现，结点局限在PS/PMMA界面区域。然而，链的末端通过它们各自的结构域分布得很好，只在结构域的中心显示出微弱的最大集中度。
Chain configurations in ordered symmetric poly(styrene-b-methyl methacrylate) diblock copolymers were examined by neutron reflectivity. In a thin-film geometry the copolymers organize into lamellar microdomains oriented parallel to the substrate surface. The copolymers were synthesized with small fractions of deuterated segments at either the chain ends or centers. This selective labeling permitted characterization of the spatial distribution of chain ends and junction points normal to the plane of the film. From the reflectivity analysis, the junction points are found to be confined to the PS/PMMA interfacial regions. The chain ends, however, are well distributed through their respective domains, exhibiting only a weak maximum in concentration at the center of the domains.