Preferred Label : degree of crystallinity;
Detailed label : degree of crystallinity of a polymer;
IUPAC acronym : IR;
IUPAC definition : The fractional amount of crystallinity in the polymer sample (w c for mass fraction;
φ c for volume fraction).;
Scope note : the degree of crystallinity can be determined by several experimental techniques;
among the most commonly used are: (i) x-ray diffraction, (ii) calorimetry, (iii) density
measurements, and (iv) infrared spectroscopy (ir). imperfections in crystals are not
easily distinguished from the amorphous phase. also, the various techniques may be
affected to different extents by imperfections and interfacial effects. hence, some
disagreement among the results of quantitative measurements of crystallinity by different
methods is frequently encountered.; the degree of crystallinity may be expressed either as the mass fraction or as the
volume fraction, the two quantities being related by wc fc?c?where ? and ?c are the
densities of the entire sample and of the crystalline fraction, respectively.; both phases are assumed to have properties identical with those of their ideal states,
with no influence of interfaces.; the assumption is made that the sample can be subdivided into a crystalline phase
and an amorphous phase (the so-called two-phase model).;
Origin ID : D01565;
Automatic exact mappings (from CISMeF team)
- See also
The fractional amount of crystallinity in the polymer sample (w c for mass fraction;
φ c for volume fraction).
