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- W2065175026 abstract "Starting with a structural study of the crystallization behaviour of poly(vinyl alcohol), the author has been analysing the crystal and molecular structures of crystalline polymers for the past 35 years. One of the characteristic points of the methods used is the co-operative use of X-ray diffraction and infrared and Raman spectroscopy (normal coordinate treatment). There are many examples of the application of this technique to a series of polyethers, polythioethers, polyesters, polymer complexes etc. Furthermore, the intra- and intermolecular energy calculations have succeeded in accelerating the structural analyses of important but complicated polymer materials and in revealing the factors governing the stable crystal structure and molecular conformation of a polymer. Poly(ethylene oxygenzoate) x form and double-stranded helices of isotactic poly(methyl methacrylate), the first double helix ever found for synthetic polymers, are used as typical for the application of this method. The structural interpretation of the mechanism of optical compensation in racemic polymers is also a good example. The energy calculations have developed to the stage where the stability of two crystal forms of polyethylene can be discussed in terms of free energy. Utilizing the structural data thus accumulated and the spectroscopically obtained interaction parameters, the structure-property relationship has been clarified quantitatively by lattice dynamical theory. The calculated crystallite moduli of polymer chains agree well with the observed ones for many polymers such as poly-p-phenylene terephthalamide, etc. The study has been advanced by a new method of calculation of the three-dimensional elastic constant tensor and its application to polyethylene, poly(vinyl alcohol), nylon 6 etc. As an extension the general method of calculating the piezoelectric constant tensor has also been derived and successfully applied to poly(vinylidene fluoride) form I, resulting in the interpretation of the origin of macroscopic piezoelectricity of this polymer." @default.
- W2065175026 created "2016-06-24" @default.
- W2065175026 creator A5004860200 @default.
- W2065175026 date "1984-02-01" @default.
- W2065175026 modified "2023-10-14" @default.
- W2065175026 title "Structure and properties of crystalline polymers" @default.
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- W2065175026 doi "https://doi.org/10.1016/0032-3861(84)90321-5" @default.
- W2065175026 hasPublicationYear "1984" @default.
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