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Structure and properties of crystalline polymers

✍ Scribed by Tadokoro, Hiroyuki

Publisher
Wiley (John Wiley & Sons)
Year
1979
Weight
531 KB
Volume
2
Category
Article
ISSN
0025-116X

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✦ Synopsis

Recent advances and status of x-ray structure analysis of crystalline polymers are described using examples of u-modification of poly(ethy1ene oxybenzoate) , poly(ethy1ene oxide), isotactic poly(methy1 methacrylate), and cellulose I. Next the relationship between crystal structures and crystaiiite mocdi (one-and threedimensional) is discussed.

Finally vibrational free energies of twc crystal modifications of poiyethylene are derived and discussed.

X-IIAY AKALYSIS OF CRYSTALLINE PCLYMERS

X-ray diffraction data of polymers are less abundant than in the case of single crystals of low-molecular-wetght substances. Therefore the essectial process of x-ray analysis of polgners is still now the repetition of trial-and-error method [e.g., 11. It is necessary to assume first the crystal structure model, calculate the diffraction intensities for the aocel, compare them with the observed values, end refine the r.odel so as to cbtain good agreerenis. Therefore

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