One of the most difficult tasks in analyzing the results of the overall crystallization kinetics, controlled by the equation a 1⁄4 1 e Kt , is the determination of power n. Usually, this is done in double logarithmic coordinates, i.e. plotting ln[ In(1 a)] against ln t. Because of the property of the logarithmic function, ln0N, this method exaggerates the role of initial stages (a-0) as well as...

The crystallization kinetics of colloidal hard spheres was studied using a special Bragg spectrometer with high sensitivity. In contrast with the classical scenario we observe a two-step nucleation process: the number of crystallites increases slowly at early times, followed by a dramatic reduction at intermediate times, prior to undergoing a rapid increase at late times. We explain these resul...

The crystallization and melting behaviors of linear polylactic acid (PLA) treated by compressed CO(2) was investigated. The isothermal crystallization test indicated that while PLA exhibited very low crystallization kinetics under atmospheric pressure, CO(2) exposure significantly increased PLA's crystallization rate; a high crystallinity of 16.5% was achieved after CO(2) treatment for only 1 m...

The role of liquid crystalline mesophases in polymer crystallization has seen increased attention following the observations of meta-stable liquid crystalline pre-ordering in the crystallization of isotactic polypropylene and other flexible polymers [1–7]. In addition to these recent observations, both in Nature and industry liquid crystal mesophases are used to create polymeric materials with ...

We summarize the internal chemical mechanism, crystallization kinetics and future prospects of MA 0 healing process.

In the present research, the primary crystallization kinetics of the amorphous Fe85.3B11P3Cu0.7 alloy was analyzed using non-isothermal DSC measurements. The average and local activation energies, Ea, were determined by different isokinetic and isoconversional methods. The results obtained for activation energy in this research, show that due to the complexity of the primary crystallization pro...

The ordering of poly(3-hexylthiophene) (P3HT) molecules in dilute P3HT/chloroform solutions was accelerated by adding small amounts of concentrated H2SO4. The concentrated H2SO4 stimulates the nucleation of crystals, which controls the overall rate of P3HT crystallization. Dispersed nuclei spur P3HT solution crystallization, and adsorbed nuclei induce P3HT crystallization on substrates. By AFM,...

Crystallization plays an important role in separation and purification of the antibiotics. And it is also an indispensable step in preparation of pharmaceuticals with biological activities and specific crystal form. As the last step in purification, crystallization determines the puri‐ ty, crystal habit, granularity and its distribution as well as pharmacologic effect, biologic ac‐ tivity and p...