After melting, PET can end up being amorphous, or crystallized with a low
crystallinity of 10%--15%, or crystallized with a medium
crystallinity of 30%-40%.
Larger changes in volume correspond in part to the achievement of a greater degree of
crystallinity. It is apparent that this change in volume becomes smaller as the applied pressure increases.
Afterward, an FTIR spectrometer (Impact type 410, USA) and X-ray diffractometer (XRD-TTR3, Japan) were used to analyze the functional groups and the degree of cellulose
crystallinity, respectively, of the treated and untreated samples.
Its
crystallinity tends to decrease with increasing molecular weight, that is typical for semicrystalline polymers.
For this study, 100 % cotton fabric of 110*110/ 60*60 was used and analysed in reference to
crystallinity and tensile strength by using X-ray diffractometer and tensile strength tester.
Figure 2 exhibited, the untreated fibers having the least
crystallinity index of 65.5% whereas it was improved in treated fibers to 74.4% and 72.87% in FT1 and FT2, respectively.
Beyond a minimum threshold of [Sr.sup.2+] inclusion, the
crystallinity decreased, whereas with [Mg.sup.2+] incorporation, the transformation of HAP into [beta]-TCP occurred.
The
crystallinity of PLA was enhanced by 114%, and the increase in
crystallinity of PLA/PHO blend was 274%, indicating a strong nucleation effect.
This indicates that the
crystallinity of CIGS films is better at higher annealing temperatures.
The optical transparency in semicrystalline polymers is mainly related to the
crystallinity and to the surface properties [9].
As showed in table 1, four curing factors such as hydrochloric acid concentration, heating rate, curing temperature and curing time were selected to be optimized by using aL 16 (44) orthogonal table in term of the
crystallinity of carbon fiber precursors.
Several methods are currently used to determine polymer
crystallinity, but most of these measurements are performed off-line, are destructive, and provide single point measurements.
