Takeji Hashimoto

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDomain-Boundary Structure of Styrene-Isoprene Block Copolymer Films Cast from Solution. 4. Molecular-Weight Dependence of Lamellar MicrodomainsTakeji Hashimoto, Mitsuhiro Shibayama, and Hiromichi KawaiCite this: Macromolecules 1980, 13, 5, 1237–1247Publication Date (Print):September 1, 1980Publication History Published online1 May 2002Published inissue 1 September 1980https://pubs.acs.org/doi/10.1021/ma60077a040https://doi.org/10.1021/ma60077a040resear

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered structure in mixtures of a block copolymer and homopolymers. 2. Effects of molecular weights of homopolymersTakeji Hashimoto, Hideaki Tanaka, and Hirokazu HasegawaCite this: Macromolecules 1990, 23, 20, 4378–4386Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 October 1990https://pubs.acs.org/doi/10.1021/ma00222a009https://doi.org/10.1021/ma00222a009research-articleACS PublicationsRequest

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTime-resolved light scattering studies on kinetics of phase separation and phase dissolution of polymer blends. 1. Kinetics of phase separation of a binary mixture of polystyrene and poly(vinyl methyl ether)Takeji Hashimoto, Jiro Kumaki, and Hiromichi KawaiCite this: Macromolecules 1983, 16, 4, 641–648Publication Date (Print):April 1, 1983Publication History Published online1 May 2002Published inissue 1 April 1983https://pubs.acs.org/doi/10.1021/ma0023

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDomain-Boundary Structure of Styrene-Isoprene Block Copolymer Films Cast from Solutions. 5. Molecular-Weight Dependence of Spherical MicrodomainsTakeji Hashimoto, Mineo Fujimura, and Hiromichi KawaiCite this: Macromolecules 1980, 13, 6, 1660–1669Publication Date (Print):November 1, 1980Publication History Published online1 May 2002Published inissue 1 November 1980https://pubs.acs.org/doi/10.1021/ma60078a055https://doi.org/10.1021/ma60078a055research-ar

Unmixing kinetics of quenched critical polymer mixture of polystyrene and poly(vinyl methyl ether) was investigated by time-resolved light scattering technique. In the late stage of spinodal decomposition τ>60, τ being a reduced time, a simple dynamic scaling law was found on the scattering function I(q,t); I(q,t)∼ξ(t)3S̃[qξ(t)] with ξ(t)∼ta, where q is the scattering vector and ξ(t)=q−1m(t) is the correlation length of the periodic unmixed structure at time t which is measured by the pos

Abstract Un mixing kinetics and ordering processes of polymer mixtures quenched into thermo-dynamically unstable states are reviewed with particular emphasis on (i) universality in the polymer dynamics in comparison with the dynamics for other systems, such as small molecular fluid mixtures, metallic alloys and inorganic glasses, and (ii) some unique characteristics associated with long-chain molecules (polymer effects, especially the effects resulting from molecular entanglements). The isotherm

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered structure in block polymer solutions. 4. Scaling rules on size of fluctuations with block molecular weight, concentration, and temperature in segregation and homogeneous regimesTakeji Hashimoto, Mitsuhiro Shibayama, and Hiromichi KawaiCite this: Macromolecules 1983, 16, 7, 1093–1101Publication Date (Print):July 1, 1983Publication History Published online1 May 2002Published inissue 1 July 1983https://pubs.acs.org/doi/10.1021/ma00241a010https://d

The early-to-late stage of the spinodal decomposition (SD) of the critical mixtures of polystyrene and poly(vinyl methyl ether) was investigated by the time-resolved light scattering technique. The early stage SD where the time evolution of the fluctuations can be described, at least with a good approximation, by the linearized theory of Cahn was found to exist in the reduced time scale τ approximately less than 2. The later stage unmixing process (τ>2) was found to give the scaling laws

A novel process to produce a nanochannel comprised of a void in a polymer matrix is reported. The processing involves a selective degradation of one of the bicontinuous microdomain phases of microphase-separated block copolymers to create a continuous, tortuous hole having a diameter of nanometer scale (nanochannel) and plating of the surfaces with nickel metal. The nanochannel and the metal plating were confirmed by the transmission and scanning electron microscopies.

Transmission light micrographs show that domains in spinodal decomposition are elongated into extremely long strings in steady states of a polymer solution under strong shear flow. The shear flow stabilizes the string against their intrinsic surface tension instabilities. The string diameter decreases with increase in the shear rate and ultimately becomes of the order of the interface thickness, resulting in shear-induced homogenization.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered structure in blends of block copolymers. 1. Miscibility criterion for lamellar block copolymersTakeji Hashimoto, Komei Yamasaki, Satoshi Koizumi, and Hirokazu HasegawaCite this: Macromolecules 1993, 26, 11, 2895–2904Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 May 1993https://pubs.acs.org/doi/10.1021/ma00063a039https://doi.org/10.1021/ma00063a039research-articleACS PublicationsRequest reu

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTThe Effect of Temperature Gradient on the Microdomain Orientation of Diblock Copolymers Undergoing an Order−Disorder TransitionTakeji Hashimoto, Jeffrey Bodycomb, Yoshinori Funaki, and Kohtaro KimishimaView Author Information Hashimoto Polymer Phasing Project, ERATO, JST, Keihanna Plaza, 1-7 Hikari-Dai, Seika, Kyoto 619-0237 Japan, and Department of Polymer Chemistry, Graduate School of Engineering, Kyoto Univ

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDomain-Boundary Structure of Styrene-Isoprene Block Copolymer Films Cast from Toluene SolutionsTakeji Hashimoto, Kikuo Nagatoshi, Akira Todo, Hirokazu Hasegawa, and Hiromichi KawaiCite this: Macromolecules 1974, 7, 3, 364–373Publication Date (Print):May 1, 1974Publication History Published online1 May 2002Published inissue 1 May 1974https://pubs.acs.org/doi/10.1021/ma60039a019https://doi.org/10.1021/ma60039a019research-articleACS PublicationsRequest re

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered Structure in Blends of Block Copolymers.2.Self-Assembly for Immiscible Lamella-Forming CopolymersTakeji Hashimoto, Satoshi Koizumi, and Hirokazu HasegawaCite this: Macromolecules 1994, 27, 6, 1562–1570Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.org/doi/10.1021/ma00084a043https://doi.org/10.1021/ma00084a043research-articleACS PublicationsRequest reuse permissi