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Typology of polymers

If the basic units are identical we have a homo-polymer if there are more kinds of basic units (e.g. two or three) we have a copolymer. In that case the composition of the macromolecule may vary from ordered repetition to random distribution. In this book we confine ourselves to these synthetic macromolecules or polymers. [Pg.7]

In essence there are only two really fundamental characteristics of polymers their chemical structure and their molar mass distribution pattern. [Pg.7]

The molecular weight distribution (MWD) or molar mass distribution (MMD) informs us about the average molecular size and describes how regular (or irregular) the molecular size is. The MMD may vary greatly, depending on the method of synthesis of the polymer. [Pg.7]

These two fundamental characteristics, CS and MMD, determine all the properties of the polymer. In a direct way they determine the cohesive forces, the packing density (and potential crystallinity) and the molecular mobility (with phase transitions). In a more indirect way they control the morphology and the relaxation phenomena, i.e. the total behaviour of the polymer. [Pg.7]

In the geometrical arrangements of the atoms in a polymer chain two categories can be discerned  [Pg.8]

In this chapter we shall consider the main aspects of polymer typology, viz. the chemical structure, the MWD, the phase transition temperatures, the morphology, and the relaxation phenomena. Furthermore a short survey will be given on multicomponent polymer systems. [Pg.8]

Emerging in the 1950s and revolutionary at the time, polymers represent the largest proportion of marine htter which can constitute up to 100% in the case of floating debris. Their diversity and their properties make the imderstanding of the evolution of this htter in the sea more complex [THO 09]. The typological analysis... [Pg.30]

When producing polymeric membranes for crystallization purposes, the selection of the material is mainly driven by the necessity to achieve a good hydrophobicity (low surface energy), high chemical stability, controlled porosity, and thickness. The typology and main characteristics of the polymers frequently used as starting material for microporous hydrophobic membranes are given in Table 10.1. [Pg.336]

See other pages where Typology of polymers is mentioned: [Pg.7]    [Pg.9]    [Pg.11]    [Pg.13]    [Pg.15]    [Pg.17]    [Pg.19]    [Pg.21]    [Pg.23]    [Pg.25]    [Pg.27]    [Pg.29]    [Pg.31]    [Pg.33]    [Pg.35]    [Pg.37]    [Pg.39]    [Pg.41]    [Pg.43]    [Pg.45]    [Pg.47]    [Pg.1021]    [Pg.7]    [Pg.9]    [Pg.11]    [Pg.13]    [Pg.15]    [Pg.17]    [Pg.19]    [Pg.21]    [Pg.23]    [Pg.25]    [Pg.27]    [Pg.29]    [Pg.31]    [Pg.33]    [Pg.35]    [Pg.37]    [Pg.39]    [Pg.41]    [Pg.43]    [Pg.45]    [Pg.47]    [Pg.1021]    [Pg.455]    [Pg.37]    [Pg.304]   


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