Alternating Lamellar Structure of Triblock Copolymers of the ABA Type

Matsushita, Yushu; Nomura, Mahito; Watanabe, Jun; Mogi, Yasuhiro; Noda, Ichiro; Imai, Masayuki

doi:10.1021/ma00122a004

Cited by 65 publications

(75 citation statements)

References 7 publications

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“…The in-situ SAXS experiments of MH-b-(PCL 2.5k ) 2 and MH-b-(PCL 1.7k ) 3 220 -250 °C) also exhibited similar microphaseseparated structures. Previous studies had revealed that the phase and domain-spacing of the ABA triblock copolymers are almost identical to those of the AB diblock copolymers obtained by cutting the B block at the center [33,34]. Therefore, the similarity in the microdomain structures between MH-b-PCL 5k -b-MH and MH-b-PCL 2.5k is consistent with the previous reports.…”

Section: Microphase Separation In Mh-b-(pcl) 2 and Mh-b-(pcl)supporting

confidence: 89%

Sub-20 nm Microphase-Separated Structures in Hybrid Block Copolymers Consisting of Polycaprolactone and Maltoheptaose

Isono

Otsuka

Halila

et al. 2015

J. Photopol. Sci. Technol.

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The present review summarizes our recent results regarding the synthesis and morphological characterization of sugar-based hybrid block copolymers (BCPs) consisting of maltoheptaose (MH) and poly( -caprolactone) (PCL). The AB-, AB 2 -, AB 3 -, ABA-, and A 2 B-type BCPs, in which the A and B blocks are MH and PCL, respectively, were synthesized by combining the living polymerization and click reaction. The in-situ small angle X-ray scattering experiments revealed the formation of ordered microphase-separated structures with a sub-20 nm periodicity.

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Section: Microphase Separation In Mh-b-(pcl) 2 and Mh-b-(pcl)supporting

confidence: 89%

Sub-20 nm Microphase-Separated Structures in Hybrid Block Copolymers Consisting of Polycaprolactone and Maltoheptaose

Isono

Otsuka

Halila

et al. 2015

J. Photopol. Sci. Technol.

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“…[59] It has been reported in the literature that the used PAni derivative is insoluble in TOL, while maintaining solubility in THF and CHO. [60,40,41] Thus, the PAni A blocks have a strong tendency to minimize the effective interface with the solvent, whereas the poly-(fluorene) B blocks maximize the effective interface with the TOL, resulting in a probably bridge-type conformation, as schematically shown in Figure 15a. [59, [61][62][63][64][65][66][67] As a result of such a conformation the dipole-dipole interaction of the poly(fluorene) B blocks with the substrate is hindered yielding a situation where the molecules do not get bound to the substrate during the drying process. Therefore, the observed agglomerate structures result from the drying behavior of the TOL solvent by means of a typically dewetting behavior, whereby the triblock …”

Section: Film Formation Of Triblock Copolymer Prepared From Tolmentioning

confidence: 99%

Structural and Electronic Properties of the First Monolayers of Spin‐Cast Poly(fluorene)‐Based Conjugated‐ Polymer Films

Plank

Güntner

Scherf

et al. 2007

Adv Funct Materials

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This study is an extended investigation on the formation of the first few monolayers of conjugated poly(fluorene)‐based polymer films prepared from solution on defined polar and nonpolar surfaces. In particular, a symmetrical A–B–A triblock copolymer consisting of poly(2‐alkylaniline) as A blocks and poly(9,9‐dialkylfluorene) as B blocks and a poly(9,9‐dialkylfluorene) homopolymer is used for this study. The dependence on drying conditions by means of solvent selection, the influence of a subsequent heat treatment, and the influence of the substrate polarity are investigated for ultrathin films as well as the transition from the first monolayers to the bulk polymer. The study is performed with optical absorption and photoluminescence spectroscopy, and atomic force microscopy to obtain complementary information of optical properties and morphological details. We find that ultrathin films (ca. 1–2 nm) prepared on mica from various solvents form highly defined, flat monolayers at the interface without lateral regularities indicating a dipole–dipole interaction between conjugated‐polymer segments and mica surface dipoles. This is further confirmed by bathochromic photoluminescence shifts observed for the ultrathin layers compared to the bulk polymer. Complementary experiments on nonpolar surfaces, highly oriented pyrolytic graphite (HOPG), show a total absence of defined flat films supporting the assumption of a dipole–dipole assisted formation on mica. For increased film thickness on mica (5 nm and more) the homopolymer does not form any regular structures or ordered layers on top of the monolayer. In contrast, the triblock copolymer, shorter in length, revealed a tendency to form a less‐defined layer‐type growth (3–3.5 nm thick) above the monolayer that was of higher order for higher‐boiling‐point solvents, indicating that the polymers are found in a different conformation. Moreover, one finds that some solvents that show partial immiscibility with the polymer strongly alter the formation of the film. The observations made for the two different types of polymers allow for an assignment of film‐formation driving forces to individual polymer segments and allow for the formulation of a growth model that explains the observed results and indicates the importance of appropriate substrate selection for organic electronic/optoelectronic devices.

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“…The P2VP sample containing ring structure was tentatively prepared by the reaction of linear P2VP having two living ends with R,R′-dibromop-xylene as a bifunctional coupling agent. 10 Thus, prepared crude product was then fractionated in order to enrich the cyclic polymer portion by removing multiply coupled products. The existence of the ring structure in the fractionated P2VP sample was confirmed by detecting the characteristic fragments reflecting the coupling moiety of the polymers in which the coupling agent combined with the living 2VP units in both functional points by using Py-GC/MS.…”

Section: Introductionmentioning

confidence: 99%

Ring Structure of Cyclic Poly(2-vinylpyridine) Proved by Pyrolysis−GC/MS

et al. 1999

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Poly(2-vinylpyridine) (P2VP) with cyclic structure was tentatively prepared through the reaction of linear P2VP having two living ends followed by coupling with a bifunctional coupling agent. Thus, prepared crude product was fractionated by preparative size exclusion chromatography in order to enrich the cyclic polymer portion. Then the existence of the ring structure in the fractionated P2VP sample was directly confirmed for the first time by pyrolysis-gas chromatography/mass spectrometry by detecting the characteristic fragments reflecting the coupling moiety of the polymers at which the coupling agent combined the living 2VP units at both functional points.

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Alternating Lamellar Structure of Triblock Copolymers of the ABA Type

Cited by 65 publications

References 7 publications

Sub-20 nm Microphase-Separated Structures in Hybrid Block Copolymers Consisting of Polycaprolactone and Maltoheptaose

Sub-20 nm Microphase-Separated Structures in Hybrid Block Copolymers Consisting of Polycaprolactone and Maltoheptaose

Structural and Electronic Properties of the First Monolayers of Spin‐Cast Poly(fluorene)‐Based Conjugated‐ Polymer Films

Ring Structure of Cyclic Poly(2-vinylpyridine) Proved by Pyrolysis−GC/MS

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