41 Result(s)
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Tisato Kajiyama
Biomaterials
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Article
Effects of Static and Dynamic Forces on Surface Viscoelastic Response of Polymer Films in Scanning Viscoelasticity Microscopy
Scanning force microscopy with force-modulation mode enables one to gain direct insights into local viscoelastic properties at polymer surfaces. Changing modulation condition such as dynamic amplitude and freq...
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Article
Further Study of Chain End Effect on Surface Mobility in Monodisperse Polystyrene Films
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Article
Effect of Cyclic Fatigue Conditions on Nonlinear Dynamic Viscoelasticity and Fatigue Behaviors for Short Glass-Fiber Reinforced Nylon 6
Fatigue behaviors of short glass-fiber reinforced nylon 6 (GF/Ny6) under three cyclic fatigue conditions, tension–tension (T–T), tension–compression (T–C) and compression–compression (C–C), were investigated o...
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Article
Surface Relaxation Processes of Poly(methyl methacrylate) Brushes Prepared by Atom Transfer Radical Polymerization
Well-defined poly(methyl methacrylate) (PMMA) brush layers were prepared onto silicon wafers by surface-initiated atom transfer radical polymerization using 2-(4-chlorosulfonylphenyl)-ethyltrichlorosilane as a...
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Article
Effect of Interfacial Interaction between Glass-Fiber and Matrix Nylon-6 on Nonlinear Dynamic Viscoelasticity and Fatigue Behavior for Glass-Fiber Reinforced Nylon-6
Effect of (glass-fiber/matrix nylon-6) interfacial interactions on fatigue behaviors of glass-fiber reinforced nylon-6 (GF/Ny6) under a strain controlled condition was investigated on the basis of in situ nonline...
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Article
Polymer-stabilized liquid crystal blue phases
Blue phases are types of liquid crystal phases that appear in a temperature range between a chiral nematic phase and an isotropic liquid phase. Because blue phases have a three-dimensional cubic structure with...
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Article
Plasma-Grafting of Polymers with Pendant Oligo(oxyethylene) Chains onto the Surface of a Polyaniline Electrode
This paper reports experiments on forming a layer composed of graft polymers with pendant oligo(oxyethylene) chains directly onto the surface of a polyaniline film by plasma-graft polymerization. The graft pol...
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Article
Molecular Weight Dependence of Hysteresis in Electro-Optical Switching of (Polymer/Liquid Crystal) Composite Systems
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Article
Chain End Group-Induced Surface Ordering in Poly(styrene-b-4-vinylpyridine) Symmetric Diblock Copolymer Films
The proton-terminated and fluoroalkyl-terminated poly(styrene-b-4-vinylpyridine) [P(St-b-4VP)] symmetric diblock copolymers were synthesized by a sequential anionic polymerization. The surface chemical compositio...
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Article
Effect of Chain End Group–Substrate Interaction on Surface Molecular Motion of Polystyrene Ultrathin Films
Surface molecular motions of monodisperse proton-terminated polystyrene (PS-H), monocarboxyl-terminated PS (PSCOOH) and dicarboxyl-terminated PS (α,ω-PS(COOH)2) ultrathin films were investigated on the basis of l...
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Article
Polymer Surface-Induced Order of Liquid Crystalline Molecular Alignment Based on Nematic–Isotropic Phase Transition Behavior
Alignment order of liquid crystal (LC) molecules at the (polymer/LC) interface was evaluated by comparing nematic-isotropic phase transition temperatures (TNI) at the interface with TNI in the bulk. The thickness...
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Article
Effect of End Group–Substrate Interaction on Aggregation Structure of Polystyrene Ultrathin Films
The aggregation structure of proton-, monocarboxyl-, and dicarboxyl terminated polystyrene (PS) ultrathin films spin-coated onto different substrate surfaces was investigated on the basis of atomic force micro...
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Article
Surface Modification of Polyaniline Film by Plasma-Graft Polymerization and Its Effect on the Redox Reaction
Poly(vinylsulfonic acid) chains having cation-exchangeable groups are introduced onto a surface of polyaniline film by means of plasma-graft polymerization, and the redox reaction mechanism of the plasma-graft...
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Article
Low Voltage Light Switching of Hybrid-Type Cell Composed of (Polymer/Liquid Crystal) Composite System
(Polymer/liquid crystal: LC) composite films consisting of a continuous LC phase embedded in a three-dimensional network of polymer matrix were prepared by a solvent-induced phase separation method. The (compo...
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Article
Highly Crystalline Polyimide Particles
Several kinds of highly crystalline polyimide particles were obtained by heating polyamic acid solutions at 180°C that induced the thermal imidization of polyamic acids in N-methyl-2-pyrrolidone (NMP). The morpho...
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Article
Effect of Main-Chain Rigidity on Fatigue Behavior of Polymeric Fibers Based on Zone Nonlinear Viscoelastic Analysis
Fatigue behavior of high-strength and high-modulus polymeric fibers was investigated based on nonlinear dynamic viscoelastic analysis under tension-tension cyclic strain condition. Poly(vinyl alcohol) (PVA) an...
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Article
Higher Order Structure and Thermo-Responsive Properties of Polymeric Gel with Crystalline Side Chains
Crosslinked polymeric gel films were prepared by a radical copolymerization of stearyl acrylate (SA) and acrylic acid (AA) with N,N′-methylenebisacrylamide (MBAA) as a cross-linker. Aggregation structure of the (...
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Article
Control of Phase-Separated Structure in (Polymer/Liquid Crystal) Composite Films and Their Electro-Optical Switching Characteristics
Phase-separation behavior and electro-optical properties were investigated for the composite films consisting of the three dimensional polymer network and low molecular weight liquid crystals (LCs) embedded in...
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Chapter and Conference Paper
Selective Adsorption of Plasma Protein Onto Phase-Separated Domain of Immobilized Organosilane Monolayer Surfaces
The phase-separated surfaces of mixed organosilane monolayers on silicon wafer are excellent model system with which to study the interaction of proteins with organic surfaces. The phase-separated structures o...
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Article
Mechanism of Electro-Optical Switching Hysteresis for (Polymer/Liquid Crystal) Composite Films
The relationship between the hysteresis characteristics of electro-optical switching and the compatibility at the polymer–low molecular weight liquid crystal (LC) interface was studied for the (polymer/LC) com...
