Abstract
Abstract In order to connect the mechanical properties of high polymers with their fundamental architecture, several structural characteristics must be considered. There is, first, the average molecular weight or the average polymerization degree of the substance, which varies between 20,000 and 1,000,000 or between 100 and 5000, respectively. There is the chain-length distribution curve, which describes the heterogeneity of the material, and is comparatively narrow in some cases and fairly wide in others. There is the chemical nature of the monomer, which can be a hydrocarbon, an alcohol, ester, ether, amine, acid, nitrile, etc., so that the polymer can have very different chemical characteristics. There are, finally, the intermolecular forces between the chain molecules, which are a consequence of the chemical nature of the monomer, and which, together with the flexibility of the chains, have a preponderant influence on mechanical performance.
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