Observation of Cylinder-Based Microphase-Separated Structures from ABC Star-Shaped Terpolymers Investigated by Electron Computerized Tomography

Takano, Atsushi; Wada, Saori; Sato, Shinya; Araki, Takuma; Hirahara, Kazuro; Kazama, Tomohiko; Kawahara, Seiichi; Isono, Yoshinobu; Ohno, Akichika; Tanaka, Nobuo; Matsushita, Yushu

doi:10.1021/ma048893t

Cited by 134 publications

(151 citation statements)

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“…The details of preparation and characterization methods were described earlier. 21 It was confirmed in a previous work that the sample with x ¼ 1.2 shows (4.8 2 ) two-dimensional pattern, while the sample with x ¼ 1.9 possesses (4.6.12). 21 The sample film was given by solventcasting from dilute solution of tetrahydrofuran followed by drying and annealing at 150 8C for 4 days in a vacuum oven.…”

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confidence: 54%

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A mesoscopic Archimedean tiling having a new complexity in an ABC star polymer

Takano

Kawashima

Noro

et al. 2005

J Polym Sci B Polym Phys

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156

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The Archimedean tiling (3 2 .4.3.4) is a regular but complex polygonal assembly of equilateral triangles and squares. This tiling pattern with mesoscopic repeating distance has been found for an ABC star-branched three-component polymer composed of polyisoprene, polystyrene, and poly(2-vinylpyridine). In this structure the environment of a molecule splits into multiple sites and two microdomains with different sizes and shapes are formed for one component. This complexity is the first observation in complex polymer systems and can lead to a new type of mesoscale self-organization. The tiling pattern has been observed for the other materials on much shorter length-scale; therefore, the experimental fact observed in the present study is demonstrating that the complexity is universal over different hierarchies.

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mentioning

confidence: 54%

“…8 2 ), and (4.6.12), have been observed systematically at a time with changing compositions of ABC molecules. 21 Thus, if we regard polygons as polymeric domains directly tiled, a complex Archimedean tiling (3 2 .4.3.4) cannot exist. However, if we employ a tiling as a skeleton, the argument is different.…”

mentioning

confidence: 99%

A mesoscopic Archimedean tiling having a new complexity in an ABC star polymer

Takano

Kawashima

Noro

et al. 2005

J Polym Sci B Polym Phys

Self Cite

156

175

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“…32,33 To extend the capability and applicability of the topology-transformable systems based on M2R, we synthesized a topology transformable ABC terpolymer. 82 A pseudo [2]rotaxane initiator (3F) capable of linking three polymer chains by the rotaxane linkage was designed as the key trifunctional compound for the star polymer synthesis (Scheme 12).…”

Section: Topology-transformable Polymers T Takata and D Aokimentioning

confidence: 99%

“…Matsushita and colleagues 32,33 reported the interesting topologydependent morphology of two types of three-component polymers with linear and star shapes. As shown in Figure 3, the linear ABC triblock copolymer and star polymer composed of three different polymer chains show unique characteristics, such as microphase-separated structures, owing to their topology.…”

Section: Introductionmentioning

confidence: 99%

“…As shown in Figure 3, the linear ABC triblock copolymer and star polymer composed of three different polymer chains show unique characteristics, such as microphase-separated structures, owing to their topology. 32,33 It is no wonder that these two polymers with different topologies cannot interconvert unless the covalent bond is broken and rearranged.…”

Section: Introductionmentioning

confidence: 99%

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Topology-transformable polymers: linear–branched polymer structural transformation via the mechanical linking of polymer chains

Takata

Aoki

2017

Polym J

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In this review article, we discuss the synthesis and dynamic nature of macromolecular systems that have mechanically linked polymer chains capable of undergoing a topology transformation driven by a rotaxane molecular switch. The rotaxane linking of polymer chains plays a crucial role in these systems. A linear polymer possessing a crown ether/sec-ammonium salt-type [1] rotaxane moiety at the axle chain terminal was prepared via the rotaxane linking of a single polymer chain. A linear-cyclic polymer topology transformation was achieved via the movement of the wheel component from one end to the other end of the axle component using the rotaxane macromolecular switch function. The successful synthesis of a macromolecular [2]rotaxane (M2R) possessing a single polymer axle and one crown ether wheel led to a variety of unique applications, such as the development of topology-transformable polymers and the synthesis of rotaxane crosslinked polymers (RCPs). The introduction of a polymer chain to the wheel component of M2R (rotaxane linking of two polymer chains) produced a rotaxane-linked AB block copolymer that transformed its topology from linear to branched. Furthermore, a rotaxane-linked three-component polymer and an ABC triblock copolymer were synthesized and transformed to the corresponding 3-arm star (co)polymers, and the transformation was confirmed by measuring the hydrodynamic volume change. The structural transformation of 4-arm and 6-arm star polymers was also accomplished using the dynamic mobility of a similar rotaxane. As a useful application, M2R-based vinylic crosslinkers (RCs) were prepared and applied to the synthesis of RCPs, whereby the addition of RCs into radical polymerization systems of vinyl monomers afforded polymers with excellent toughness by enhancing both of tradeoff properties that cannot be achieved using typical covalent crosslinkers.

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Morphologies of Block and Star‐Branched Polymers with Three Components

Hasegawa

2011

Complex Macromolecular Architectures

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Observation of Cylinder-Based Microphase-Separated Structures from ABC Star-Shaped Terpolymers Investigated by Electron Computerized Tomography

Abstract: Characteristic cylindrical microphase-separated structures have been found for three ABC star-shaped terpolymers. The samples are composed of polystyrene (S), polyisoprene (I), and poly(2vinylpyridine) (P); their volume ratios of I:

Cited by 134 publications

References 23 publications

A mesoscopic Archimedean tiling having a new complexity in an ABC star polymer

A mesoscopic Archimedean tiling having a new complexity in an ABC star polymer

Topology-transformable polymers: linear–branched polymer structural transformation via the mechanical linking of polymer chains

Morphologies of Block and Star‐Branched Polymers with Three Components

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