Effects of the addition PDLA on crystallization behavior PLLA was investigated by means differential scanning calorimetry, wide-angle X-ray diffraction, melt rheology, and polarized optical microscopy. Nonisothermal isothermal including low (l-PDLA) high molecular weight (h-PDLA) were studied. PLLA/PDLA asymmetric blends form stereocomplex (SC) crystal stay unmelted at 200 °C in melt. measurement from showed monotonous rise temperature for PLLA/h-PDLA blend, while peculiar concentration...

Transport of ions in polymer electrolytes is significant practical interest, however, differences the transport anions and cations have not been comprehensively addressed. We present measurements electrochemical properties lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) poly(ethylene oxide) (PEO) over a wide range PEO molecular weights salt concentrations. Individual self-diffusion coefficients Li+ TFSI– ions, D+ D–, were measured using pulsed-field gradient nuclear magnetic resonance...

Well-entangled monodisperse linear polystyrene melts exhibit monotonic thinning of the steady state elongational viscosity with increasing strain rate ε̇ even beyond Rouse relaxation frequency, τR-1. This behavior is quite different from followed by hardening at > τR-1 observed for entangled semidilute solutions. We attempt to elucidate molecular origin this difference focusing on concept stretch/orientation-dependent monomeric friction ζ recently proposed Ianniruberto and co-workers....

Quasi-elastic neutron scattering experiments on mixtures of poly(ethylene oxide) and lithium bis(trifluoromethane)sulfonimide salt, a standard polymer electrolyte, led to the quantification effect salt segmental dynamics in 1-10 Å length scale. The monomeric friction coefficient characterizing these scales increases exponentially with concentration. More importantly, we find that this change alone is responsible for all observed nonlinearity dependence ionic conductivity Our analysis leads...

Abstract Ligand‐stabilized noble metal nanoclusters, prepared by various chemical methods different research groups in Japan and Germany, were characterized examined a common method for application to the catalysis hydrogenation of olefins homogeneous heterogeneous systems liquid phase. The mean diameters palladium, platinum, rhodium Pd/Pt nanoclusters stabilized ligands range from 1.3 3.2 nm if single reaction, 2.2 4.0 stepwise growth method. Stokes radii surfactants 1.7 2.1 nm, suggesting...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterdependence of shear deformations and block copolymer morphologyKaren I. Winey, Sanjay S. Patel, Ronald G. Larson, Hiroshi WatanabeCite this: Macromolecules 1993, 26, 10, 2542–2549Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 1993https://pubs.acs.org/doi/10.1021/ma00062a024https://doi.org/10.1021/ma00062a024research-articleACS PublicationsRequest reuse permissionsArticle...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of poly(2-vinylpyridine)-poly (styrene) block copolymers from toluene solutionsEdward Parsonage, Matthew Tirrell, Hiroshi Watanabe, and Ralph G. NuzzoCite this: Macromolecules 1991, 24, 8, 1987–1995Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 1991https://pubs.acs.org/doi/10.1021/ma00008a041https://doi.org/10.1021/ma00008a041research-articleACS PublicationsRequest reuse...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShear Orientation and Rheology of a Lamellar Polystyrene-Polyisoprene Block CopolymerS. S. Patel, R. G. Larson, K. I. Winey, H. WatanabeCite this: Macromolecules 1995, 28, 12, 4313–4318Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995https://pubs.acs.org/doi/10.1021/ma00116a038https://doi.org/10.1021/ma00116a038research-articleACS PublicationsRequest reuse permissionsArticle...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSlow Dielectric Relaxation of a Styrene-Isoprene-Styrene Triblock Copolymer with Dipole Inversion in the Middle Block: A Challenge to Loop/Bridge ProblemHiroshi WatanabeCite this: Macromolecules 1995, 28, 14, 5006–5011Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995https://pubs.acs.org/doi/10.1021/ma00118a032https://doi.org/10.1021/ma00118a032research-articleACS PublicationsRequest...

Flow behavior was examined for a 1.0 wt % aqueous solution of hydrophobically modified ethoxylated urethane (HEUR; Mw = 4.6 × 104). In the linear viscoelastic regime, exhibited single-Maxwellian attributable to thermal reorganization transient network composed strings HEUR flower micelles. Under shear flow at intermediate rates γ̇ just above equilibrium relaxation frequency 1/τ, thickening characterized by monotonic increase viscosity growth function η+(t;γ̇) with time t η+(t) and...

We compare the linear and nonlinear rheological response of three entangled polystyrene solutions with same concentration polymer, but diluted using different solvents. The have exactly physical tube model parameters when normalized to time scale. Although behave identically in small amplitude oscillatory shear flow, they markedly large strain extensional flow. experimental observations presented here directly demonstrate that its governing are insufficient describe behavior polymer...

Previous studies indicate that immunostimulatory DNA‐based injectable hydrogels harboring unmethylated cytosine‐phosphate‐guanine (CpG) dinucleotides meet the requirements of an effective antigen delivery system, including safety, biodegradability, ease administration, and stimulation innate immune system. However, rapid release model ovalbumin (OVA) from hydrogel limits its potential. Here, aim is to achieve sustained OVA a DNA through cationization antigen. Ethylenediamine (ED)‐conjugated...

We revisit previously published dielectric and viscoelastic data of binary blends linear cis-polyisoprene [Watanabe, H.; Ishida, S.; Matsumiya, Y.; Inoue, T. Macromolecules2004, 37, 6619] in order to test the validity dynamic tube dilution (DTD) picture determine most appropriate value exponent α. conclude that DTD with α = 1 is more at short times, while longer time, a larger 4/3 gives better description experiments. Furthermore, between these two time regions, broad crossover zone found,...

Enabling the use of lithium metal anodes is a critical step required to dramatically increase energy density rechargeable batteries. However, dendrite growth in batteries, and lack fundamental understanding factors governing this growth, limiting factor preventing their adoption. Herein we present effect battery cycling temperature, ranging from 90 120°C, on through polystyrene-block-poly(ethylene oxide)-based electrolyte. This temperature range encompasses glass transition polystyrene...

Journal Article "ALLITHIAMINE" A NEWLY FOUND DERIVATIVE OF VITAMIN B1: I. DISCOVERY ALLITHIAMINE Get access MOTONORI FUJIWARA, FUJIWARA Department of Hygiene, Faculty Medicine, Kyoto UniversityKyoto Search for other works by this author on: Oxford Academic PubMed Google Scholar HIROSHI WATANABE, WATANABE KIYOO MATSUI The Biochemistry, Volume 41, Issue 1, January 1954, Pages 29–39, https://doi.org/10.1093/oxfordjournals.jbchem.a126421 Published: 01 1954 history Received: 21 September 1953

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurement of forces in symmetric and asymmetric interactions between diblock copolymer layers adsorbed on micaHiroshi Watanabe Matthew TirrellCite this: Macromolecules 1993, 26, 24, 6455–6466Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November 1993https://pubs.acs.org/doi/10.1021/ma00076a023https://doi.org/10.1021/ma00076a023research-articleACS PublicationsRequest reuse...

For highly entangled cis-polyisoprene (PI) star polymers having more than 10 entanglements in each arm, dielectric and viscoelastic properties were examined within a context of the generalized tube model incorporating dynamic dilation (DTD) mechanism. The PI had type A dipoles parallel along arm backbone, global motion results as well relaxation. DTD relationship between relaxation functions Φ(t) μ(t), μ(t) ≅ [Φ(t)]2 (derived under an assumption random displacement entanglement segment...

The molecular picture of dynamic tube dilation (DTD) was tested for viscoelastic and dielectric data two series entangled binary blends linear cis-polyisoprenes (PI) having 10-3M2 = 308 10-3M1 94.0 or 21.4. volume fraction υ2 the high-M chains varied from 0.005 to 0.5. Struglinski−Graessley parameter rSG (= M2Me2M1-3), specifying constraint release (CR) contribution relaxation at small υ2, quite different (rSG 0.0093 0.79). For large 0.5), full-DTD treating relaxed portions as a simple...