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Your search keyword '"Tomoyuki Yamamoto"' showing total 5 results
Start Over Author "Tomoyuki Yamamoto" Journal macromolecules
5 results on '"Tomoyuki Yamamoto"'

1. Synthesis and Characterization of Thieno[3,4-b]thiophene-Based Copolymers Bearing 4-Substituted Phenyl Ester Pendants: Facile Fine-Tuning of HOMO Energy Levels

Author

Takayuki Kuwabara, Shigeyoshi Kanoh, Tomoyuki Yamamoto, Kohshin Takahashi, Tomoyuki Ikai, Katsuhiro Maeda, and Mitsuhiro Kuzuba

Subjects
Bearing (mechanical), Materials science, Polymers and Plastics, Organic Chemistry, law.invention, Characterization (materials science), Inorganic Chemistry, chemistry.chemical_compound, chemistry, law, Polymer chemistry, Materials Chemistry, Thiophene, Copolymer
Published
2011

2. Morphological Alterations Induced by Temperature and Humidity in Ethylene−Vinyl Alcohol Copolymers

Author

David Cava, Enrique Giménez, Jose M. Lagaron, Pilar Hernández-Muñoz, Rafael Gavara, Amparo López-Rubio, and Tomoyuki Yamamoto

Subjects
chemistry.chemical_classification, Ethylene, Materials science, Polymers and Plastics, Annealing (metallurgy), Small-angle X-ray scattering, Organic Chemistry, Humidity, Polymer, humanities, Inorganic Chemistry, chemistry.chemical_compound, Crystallinity, symbols.namesake, chemistry, Chemical engineering, Polymer chemistry, Materials Chemistry, symbols, Raman spectroscopy, Monoclinic crystal system
Abstract

The morphologies of a number of high barrier ethylene−vinyl alcohol food packaging films with different ethylene contents have been evaluated by simultaneous WAXS/SAXS, FT-IR, DSC, and Raman spectroscopy. This rather descriptive pioneering study was aimed at the understanding of the morphological changes that occur in these polymers as a result of temperature, humidity, and combination of temperature and humidity treatments. From the results, the temperature effect was, as expected, found to improve polymer crystalline morphology, leading to a higher, denser, and more stable crystallinity. Lower ethylene content copolymers underwent partial solid−solid phase transition toward a more thermodynamically stable monoclinic morphology upon sufficient annealing. On the other hand, moisture sorption was found to result in melting of ill-defined crystals, particularly for the lowest ethylene content copolymers. This water sorption-induced crystal melting process has not been reported before and was seen to be larg...

Published
2003

4. Structure characterization of polyurethanes containing poly(dimethylsiloxane)

Author

Mitsuhiro Shibayama, Tomoyuki Yamamoto, Masakatsu Suetsugu, Shinichi Sakurai, and Shunji Nomura

Subjects
Materials science, Polymers and Plastics, Ethylene oxide, Organic Chemistry, Soft segment, Dynamic mechanical analysis, body regions, Inorganic Chemistry, chemistry.chemical_compound, Differential scanning calorimetry, chemistry, Polymer chemistry, Materials Chemistry, human activities
Abstract

The degrees of completion in microphase separation for segmented polyurethanes containing a block segment of poly(ethylene oxide)-b-poly(dimethylsiloxane)-b-poly(ethylene oxide) (PES) were investigated. The results were compared with those for PES-free polyurethanes having the same molecular weight of the soft segment.

Published
1991

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