Three-phase hierarchical structures from AB/CD diblock copolymer blends with complemental hydrogen bonding interaction
Three-phase hierarchical structures from AB/CD diblock copolymer blends with complemental hydrogen bonding interaction
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DOI：
10.1021/ma051156s
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发表时间：
2005-10-18
期刊：
影响因子：
5.5
通讯作者：
Matsushita, Y
中科院分区：
文献类型：
--
作者：
Asari, T;Matsuo, S;Matsushita, Y
研究了AB/CD两嵌段共聚物共混物的复杂相结构。使用两对具有不同摩尔比（5：5和9：1）的聚（异戊二烯-嵌段-2-乙烯基吡啶）（IP）和聚（苯乙烯-嵌段-4-羟基苯乙烯）（SH）二嵌段共聚物;它们分别被编码为IP-55、IP-91、SH-55和SH-91。两种聚合物物种，即聚（2-乙烯基吡啶）和聚（4-羟基苯乙烯），出四个组分是通过氢键相互作用，以及在溶液中相互混溶。通过TEM和SAXS的形态观察，证实IP/SH共混物是自组装形成的复杂的三相微相分离结构。即，观察到两种分级结构，即，一种是来自IP-55/SH-55 = 50/50共混物的独特的层状结构，其中来自P和H的混合的一个相形成交替的层状结构，而I和S相交替地排列在每隔一个层状相中。IP-91/SH-91 = 50/50时的另一种是由另一种特殊的片层结构组成，其中P/H混合相在片层S和I层之间形成孤立的圆柱体。
Complex phase structures of AB/CD diblock copolymer blends were investigated. Two pairs of poly(isoprene-block-2-vinylpyridine) (IP) and poly(styrene-block-4-hydroxystyrene) (SH) diblock copolymers with different molar ratios, 5:5 and 9:1, were used; they were coded IP-55, IP-91, SH-55, and SH-91, respectively. Two polymer species, that is, poly(2-vinylpyridine) and poly(4-hydroxystyrene), out of four components are miscible with each other via hydrogen bonding interactions in bulk as well as in solution. From morphological observation using TEM and SAXS, it was confirmed that IP/SH blends were self-assembled to form the complex three-phase microphase-separated structures. Namely, two kinds of hierarchical structures were observed, that is, one is a unique lamellar structure from a IP-55/SH-55 = 50/50 blend, where mixed one phases from P and H form alternating lamellae, whereas I and S phases are arranged alternatingly in every second lamellar phase. The other one from IP-91/SH-91 = 50/50 consists of another peculiar lamellar structure, where the P/H mixed phase forms isolated cylinders between lamellar S and I layers.