By David I. Bower

ISBN-10: 0511077572

ISBN-13: 9780511077579

ISBN-10: 0521631378

ISBN-13: 9780521631372

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The integer n, which is the number of wavelengths path difference for scattering from adjacent planes, is called the order of diffraction or ‘reflection’. e. to regard nth-order scattering from a set of planes with spacing d that actually all pass through lattice points as if it were first order (n ¼ 1) scattering from a set of planes separated by d* ¼ d=n, some of which do not pass through lattice points. It has already been seen above that every diffraction spot can be associated with a set of diffraction indices (hkl), so that the separation d* can be replaced by dhkl.

The chains still have reactive ends and a second type of monomer can then be added to the reaction to produce a block of a different type of polymer. 1. 6 Data from Industrial Commodities Statistics Yearbook, UN, New York, 1995. book. Some of the uses have also been mentioned. This section contains some rather general comments on the reasons why the properties of polymers make them so important for a wide variety of applications. 2 give first some statistical information about the production and use of polymers.

Two processes, the Phillips process and the Ziegler–Natta process, which differ according to the catalyst used, are of particular importance. The emergence of a new generation of catalysts led to the appearance of linear low-density polyethylenes. These have a higher level of co-monomer incorporation and have a higher level of branching, up to that of low-density material, but the branches in any given polymer are of one type only, which may be ethyl, butyl, isobutyl or hexyl. 13 14 Introduction Polyethylene is a special example of a generic class that includes many of the industrially important macromolecules, the vinyl and vinylidene polymers.

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An Introduction to Polymer Physics by David I. Bower

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