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W. Balcerowiak



The degree of crystallinity of polymer systems as determined by DSC


Polimery 1998, No 6, 373


DOI: dx.doi.org/10.14314/polimery.1998.373


Summary

The definition of the degree of crystallinity wc of homopolymers was extended to comprise the polymeric (composite) system containing more than one type of the polymeric crystalline phase and/or nonpolymeric components (in amounts of wn weight parts). For a polymeric system the degree of crystallinity wc* was assumed to be the sum of fractional contents of crystalline phases in the polymeric portion of the system. With DSC used to determine the degree of crystallinity of a polymeric system, the degree of crystallinity (wc,h*) was shown to be the weighted average of the degrees of crystallinity of component polymers, wc,h {i} with the weights equal to their weight fraction in the polymer portion of the system, wi, (1 – wn)-1. The crystallinity degree can thus be determined by DSC, even if the fractions remain unknown: the quantitative composition of the polymeric part of the (composite) system examined need not be known. Quantitative interpretation of DSC curves is illustrated for homopolymers, copolymers and polymeric composites.


Keywords: differential scanning calorimetry, definition of degree of crystallinity of composite polymer systems, DSC determination of degree of crystallinity of homo- and co-polymers and composites


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