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زبان فایل : انگلیسی
نوع فایل : PDF
Polymers of high molecular weight have now been accepted as respectable members
of the molecular community. This situation was not always true.(1) It is now recognized however that polymer molecules possess the unique structural feature of
being composed of a very large number of chain units that are covalently linked
together. This property is common to all macromolecules despite their diverse
origin their widely differing chemical and stereochemical structures and uses and
function. It is therefore possible to study this class of substances from a unified
point of view that encompasses the relatively simpler polymers prepared in the
laboratory as well as the more complex ones of nature. The characteristic thermodynamic hydrodynamic physical and mechanical properties possessed by high
polymeric substances can be explained in the main by their covalent structure and
the attendant large size of the individual molecules.
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