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- W1742865472 abstract "This chapter presents an overview of the diffraction methods used to establish the crystal structure and crystallinity of polymers. X-ray diffraction is a major tool for studying the structure of matter. Because of the economy, around 90% of all polymer wide-angle x-ray diffraction investigations are performed with general-purpose sealed tubes. By far, the most commonly used anode metal is copper. This is primarily because of copper's high thermal conductivity (for heat dissipation). The basic experimental arrangement for obtaining x-ray scattering data from a polymer specimen consists of the collimated x-ray beam, the specimen, and an x-ray detection device to record the scattered radiation. The two detection systems used are photographic film, and electronic counters. Each plays an essential role in polymer crystallography and employs instrumentation of specific design. In this chapter, concepts related to crystal systems, space lattices, and the unit cell are described. Symmetry of crystals is described, and symbols of symmetry planes are discussed. Structure and space group of polyethylene is illustrated. Chain conformations and repeat units of two crystalline polymers—polytetrafluoroethylene and polyethylene are explained. Diffraction theory is discussed, and schematic illustration of scattering from a classical electron is presented. Crystal structure of polyisobutylene is elaborated." @default.
- W1742865472 created "2016-06-24" @default.
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- W1742865472 date "1980-01-01" @default.
- W1742865472 modified "2023-10-02" @default.
- W1742865472 title "6.1 Unit Cell and Crystallinity" @default.
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- W1742865472 doi "https://doi.org/10.1016/s0076-695x(08)60756-5" @default.
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