Crystallization of polymers is a process associated with partial alignment of their molecular chains. These chains fold together and form ordered regions called lamellae, which compose larger spheroidal structures named spherulites. Polymers can crystallize upon cooling from melting, mechanical stretching or solvent evaporation. Crystallization affects optical, mechanical, thermal and chemical properties of the polymer. The degree of crystallinity is estimated by different analy… Weba broad temperature range. Crystallization of the small amount of amorphous polymer begins with the glass phase transition. Rapid cooling of plastic melts produces an amorphous solid. The glass transition and crystallization transition are readily apparent and often occur at distinctly different temperatures in amorphous solids.
Crystallization of polymers - Wikipedia
WebJun 8, 2016 · In order to understand orientation-induced crystallization of polymers, we introduced an intermolecular interaction between polymer chains based on quantum … WebThis work demonstrates that, despite the existence of a significant number of works on PLA crystallization, there is still a relatively simple way, different from those already described, in which its complex kinetics can be observed. The X-ray diffraction (XRD) results presented here confirm that the PLLA under study crystallizes mostly in the α and … littleborough central school
Effects of rapid crystallization on hydrolytic degradation and ...
WebIn addition, the PLA-SA-PBS molecules preferentially support crystallization of PBS phase with increased degree of crystallinity (X c,PBS) by ~15%. These enhanced homogeneity of PLA/PBS/SA blend and high X c,PBS trigger the increased tensile strength to 50 MPa, and substantially reduced oxygen permeation coefficient approximately 10 times. WebAbout this book. Since the discovery that polymer single crystals are composed of chain folded macromolecules in 1957, the crystallization of polymers has attracted considerable interest and still provides fascinating and fruitful areas of research. Only a few books have been fully devoted to the crystallization of polymers in the past. WebOct 1, 2002 · In The Crystallization of Polymers, 2nd Edition, Leo Mandelkern provides a self-contained, comprehensive and up-to-date treatment of polymer crystallization. All … littleborough community primary