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Structural changes occurring in the ordering process of crystalline polymers have been investigated by combining various such kinds of techniques as X-ray scattering, infrared and Raman spectroscopy, etc. The methods to perform the time-resolved measurements under quick and stable temperature jumping process between two fixed temperatures, for example, were reviewed. Application of these techniques...
Infrared spectral measurement was carried out to find the crystallization of the amorphous poly(ethylene imine) (PEI) sample into the hydrates by absorbing water molecules. When PEI sample was melted and cooled to room temperature in dry state, it was found to crystallize into the anhydrate consisting of doubly stranded helices. But when the sample was melted and subjected to the humid atmosphere...
Structural change occurring in the cooling process of polyoxymethylene from the molten state has been investigated by carrying out the temperature dependent measurements of small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS). In the SAXS experiment the generation of lamellar stacking structure with long period of ca. 14nm was detected at first and then the new lamellae were...
To investigate the mechanism of high elongation of natural rubber attained by the ‘racking method’, a strip of smoked-sheet was elongated up to 150 times in length, by stretching rapidly at room temperature and forcing to shrink at 75–80°C repeatedly. On X-ray diffraction, a typical fibre pattern with an amorphous ring appeared already at ×10 (stretch ratio=10). The degree of crystallinity increased...
In order to clarify the origins of cocrystallization and phase segregation phenomena observed for blend samples between fully-deuterated high-density polyethylene (DHDPE) and hydrogeneous linear low-density polyethylene (LLDPE) with various degrees of ethyl branchings, diffusion process of deuterated (D) and hydrogeneous (D) polyethylene chains through the contact interface between the D and H films...
In order to clarify the photo-induced solid-state reactions of a series of dialkyl Z,Z-muconates, the time-resolved FT–IR measurements were performed. From the observations of the IR spectral changes in these reactions, the following three types of reactions were found: (1) the polymerization reaction to give the stereoregular polymer; (2) the isomerization reaction from Z,Z to E,E-form followed by...
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