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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


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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