A mesoscopic tiling pattern with 12-fold symmetry has been observed in a three-component polymer system composed of polyisoprene, polystyrene, and poly(2-vinylpyridine) which forms star-shaped terpolymer, polystyrene homopolymer blend. Transmission electron microscopy images reveal nonperiodic covered equilateral triangles squares, their triangle/square number ratio 2.3 ($\ensuremath{\approx}4/\sqrt{3}$), microbeam x-ray diffraction shows dodecagonal symmetry. The same kind quasicrystalline...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSuperlattice Structures in Morphologies of the ABC Triblock CopolymersYasuhiro Mogi, Mahito Nomura, Hiroyuki Kotsuji, Kouki Ohnishi, Yushu Matsushita, and Ichiro NodaCite this: Macromolecules 1994, 27, 23, 6755–6760Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https://pubs.acs.org/doi/10.1021/ma00101a013https://doi.org/10.1021/ma00101a013research-articleACS...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and morphology of triblock copolymers the ABC typeYasuhiro Mogi, Hiroyuki Kotsuji, Yuji Kaneko, Katsuaki Mori, Yushu Matsushita, Ichiro NodaCite this: Macromolecules 1992, 25, 20, 5408–5411Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pubs.acs.org/doi/10.1021/ma00046a043https://doi.org/10.1021/ma00046a043research-articleACS PublicationsRequest reuse...

Since the beginning of this century, new polymer morphologies beyond conventional ones have been found in several complex systems. This article summarizes very recent advances morphological studies on block copolymer-based multiple component systems that possess characteristic chain connectivity and noncovalent bonding interactions. Among those, three types multiphase are examined here. The first system consists star-shaped terpolymers ABC type, which exhibit Archimedean tiling structures....

Supramolecular polymer gels are precisely designed physical brought together by reversible secondary interactions to form three dimensional networks of melt macromolecules. Generally, they differ from supramolecular because comprised polymers instead low molecular weight compounds. Recently, much effort has focused on designing and related materials with excellent properties; indeed, improvements have been made in their interactions, complementarity the non-covalent bonding units, nature...

We report the thermoreversible viscoelastic properties of a supramolecular ion gel. Two building blocks were used to form "supramacromolecules". An ABA triblock copolymer (Mn = 50 000, poly(2-vinylpyridine)-b-poly(ethyl acrylate)-b-poly(2-vinylpyridine)) (P2VP−PEA−P2VP), with mole ratio 0.1/0.8/0.1 as telechelic polymer, and poly(4-hydroxystyrene) (PHS) homopolymer, Mn 6600 connector, physical gel via hydrogen bonding between P2VP PHS. The thermally stable, hydrophobic ionic liquid...

We propose a new strategy to enhance mechanical properties of ABA triblock copolymer-based elastomers by incorporating transient cross-links into the soft middle block. An triblock-type copolymer, poly(4-vinylpyridine)-b-[(poly(butyl acrylate)-co-polyacrylamide]-b-poly(4-vinylpyridine) (P–Ba–P), was synthesized via RAFT polymerization. In molecular design, poly(4-vinylpyridine) (P) end blocks with high Tg formed pseudo-cross-link domains due segregation against Ba block, while acrylamide...

The melt rheology of highly-purified ring polystyrenes in a wide range molecular weights (10K ≤ Mw 240K g/mol) was investigated. All the rings revealed no obvious rubbery plateau and faster terminal relaxation compared to linear counterparts. rheological data obtained were with some theoretical models such as Rouse model lattice-animal model. Moreover, two parameters, zero-shear viscosities η0 steady-state recoverable compliances Je, estimated, their dependence discussed. From these...

Abstract The Archimedean tiling (3 2 .4.3.4) is a regular but complex polygonal assembly of equilateral triangles and squares. This pattern with mesoscopic repeating distance has been found for an ABC star‐branched three‐component polymer composed polyisoprene, polystyrene, poly(2‐vinylpyridine). In this structure the environment molecule splits into multiple sites two microdomains different sizes shapes are formed one component. complexity first observation in systems can lead to new type...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTricontinuous morphology of triblock copolymers the ABC typeYasuhiro Mogi, Katsuaki Mori, Yushu Matsushita, and Ichiro NodaCite this: Macromolecules 1992, 25, 20, 5412–5415Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pubs.acs.org/doi/10.1021/ma00046a044https://doi.org/10.1021/ma00046a044research-articleACS PublicationsRequest reuse permissionsArticle...

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(2-vinylpyridine) (P); their volume ratios I:S:P about 1:1:0.7, 1:1:1.2, 1:1:1.9, respectively, components being connected at one branch point. From three-dimensional morphological observation by TEM combined with electron computerized tomography, a terpolymer ratio 1:1:0.7 shows honeycomb-type microdomain...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular weight dependence of lamellar domain spacing diblock copolymers in bulkYushu Matsushita, Katsuaki Mori, Ryuichi Saguchi, Yasushi Nakao, Ichiro Noda, and Mitsuru NagasawaCite this: Macromolecules 1990, 23, 19, 4313–4316Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 September 1990https://pubs.acs.org/doi/10.1021/ma00221a019https://doi.org/10.1021/ma00221a019research-articleACS...

A series of supramacromolecular ion gels were prepared from blends a poly(2-vinylpyridine)-b-poly(ethyl acrylate)-b-poly(2-vinylpyridine) (VEAV) triblock copolymer and poly(4-hydroxystyrene) (H) homopolymer in an ionic liquid. The VEAV concentration was held at 10 wt %, the H varied 0 to 8 %. solvent room temperature liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMITFSI). Above 160 °C all samples formed homogeneous solutions, but upon cooling due increased hydrogen...

We studied equilibrium conformations of ring polymers in melt over the wide range segment number N up to 4096 with Monte-Carlo simulation and obtained dependence radius gyration chains R(g). The model used is bond fluctuation (BFM), where polymer segments bear excluded volume; however, volume effect vanishes at N-->infinity, linear can be regarded as an ideal chain. Simulation for was performed, nu value relationship R(g) proportional N(nu) decreased gradually increasing N, finally it...

Ring polystyrenes (PSs) were synthesized by anionic polymerization technique and purified with preparative size-exclusion chromatography (SEC). Seven ring PSs their weight-average molecular weight (Mw) ranging from 17k to 570k prepared they confirmed have high purities all over 96% liquid at the chromatographic critical condition (LCCC) analyses. Their radii of gyration (Rgs) determined in benzene-d6 as a good solvent cyclohexane-d12 or cyclohexane-h12 Θ solvents small-angle neutron...

Highly extensible supramolecular elastomers are prepared from ABA triblock-type copolymers bearing glassy end blocks and a long soft middle block with multiple hydrogen bonds. The copolymer used is polystyrene-b-[poly(butyl acrylate)-co-polyacrylamide]-b-polystyrene (S-Ba-S), which synthesized via reversible addition–fragmentation chain transfer (RAFT) polymerization. Tensile tests reveal that the breaking elongation (εb) increases an increase in molecular weight (Mmiddle). Especially,...

Microphase-separated structures of diblock copolymers with narrow molecular weight distributions but various composition were investigated. Monodisperse nine parent block composed polystyrene and poly(2-vinylpyridine) having almost the same different volume fraction, φs, covering 0.1−0.9, prepared. Successively they blended variously to produce samples constant average composition; that is, φs was kept at approximately 0.5. Structures from solvent-cast well-annealed films observed through...

New tiling patterns with complex arrangements have been identified for ABC star-shaped terpolymers and ABC/A/B copolymer/homopolymer blends characterized by transmission electron microscopy microbeam small-angle X-ray scattering. The samples are composed of polyisoprene (I), polystyrene (S), poly(2-vinylpyridine) (P), whose volume ratios I:S:P 1.0:1.8:X, where X covers the range 0.8 ≤ 3.2. other series type I1.0SYP2.0 Y in 1.1 2.7 was also prepared adding I or S homopolymers to I1.0S1.8PX....

Complex phase structures of AB/CD diblock copolymer blends were investigated. Two pairs poly(isoprene-block-2-vinylpyridine) (IP) and poly(styrene-block-4-hydroxystyrene) (SH) copolymers with different molar ratios, 5:5 9:1, used; they coded IP-55, IP-91, SH-55, SH-91, respectively. polymer species, that is, poly(2-vinylpyridine) poly(4-hydroxystyrene), out four components are miscible each other via hydrogen bonding interactions in bulk as well solution. From morphological observation using...

We report on the morphological variations of SP/H blends containing a poly(styrene-block−2-vinylpyridine) diblock copolymer (SP) (Mw = 130K) and poly(4-hydroxystyrene) (H) 14K) with different blend compositions. The structures were observed by transmission electron microscopy (TEM) as well small-angle X-ray scattering (SAXS). results compared those obtained from SP/P blends, where P denotes poly(2-vinylpyridine) homopolymer. neat SP copolymer, an S block volume fraction, ϕs, 0.67, has...

We describe morphological variations in binary mixtures of a poly(styrene-b-2-vinylpyridine) diblock copolymer (SP) (Mw = 151K) and poly(4-hydroxystyrene)s 8K, 14K, 52K) (H8, H14, H52) as function molecular weight homopolymer H blend ratio. Transmission electron microscopy reveals ordered nanophase-separated structures for all samples regardless the amount added. As much 28-fold H52, which has Mw higher than that P block, can be added to SP block without inducing macrophase separation. This...

Thermoreversible supramolecular polymer gels were prepared via metal–ligand coordination by mixing a poly(4-vinylpyridine)-b-poly(ethyl acrylate)-b-poly(4-vinylpyridine) (P4VP–PEA–P4VP) triblock copolymer and zinc chloride (ZnCl2) in hydrophobic ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imidide. FT-IR spectroscopy revealed between ZnCl2 pyridine groups as ligands on P4VP blocks, even an liquid. viscoelastic properties semisolid (gel-like) state liquid-like...

Nonvolatile solvent swollen 1D periodic films were fabricated from lamellae-forming block copolymers with medium molecular weight by infiltrating an ionic liquid. A mixture of imidazole and imidazolium bis(trifluoromethanesulfonyl)imide as a room temperature liquid was added after spin-coating thin polystyrene-b-poly(2-vinylpyridine) (PS–P2VP) having approximately 50/50 composition to create photonic reflecting in the visible regime. Under normal conditions humidity, maintained their...