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- W3022627142 abstract "Publisher SummaryPolymers are in general use because they provide good mechanical properties at reasonable cost. The mechanical properties of polymers are not single-valued functions of the chemical nature of the macromolecules. They will vary also with molecular weight, branching, cross-linking, crystallinity, plasticizers, fillers and other additives, orientation, and other consequences of processing history and sometimes with the thermal history of the particular sample. When all these variables are fixed for a particular specimen, it will still be observed that the properties of the material will depend strongly on the temperature and time of testing compared to metals. Although the mechanical response of macromolecular solids is complex, it is possible to gain an understanding of the broad principles that govern this behavior. Sections of polymer chains must be capable of packing together in ordered periodic arrays for crystallization to occur. This requires that the macromolecules should be fairly regular in structure. Random copolymerization will prevent crystallization. A melting temperature range is observed in all semi-crystalline polymers, because of variations in the sizes and perfection of crystallites. The crystal melting point is the highest melting temperature observed in an experiment like differential scanning calorimetry. High-molecular-weight flexible macromolecules do not crystallize completely. When the polymer melt is cooled, the crystallites will be nucleated and start to grow independently throughout the volume of the specimen." @default.
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- W3022627142 date "1982-01-01" @default.
- W3022627142 modified "2023-09-26" @default.
- W3022627142 title "Mechanical Properties of Polymer Solids and Liquids" @default.
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- W3022627142 doi "https://doi.org/10.1016/b978-0-12-601680-2.50015-6" @default.
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