WebPMEA could be classified into three types: non-freezing, freezing-bound and free water. Cold crystallization of water was clearly observed at about ÿ42°C on heating when the water content was more than 3.0wt%. Cold crystallization is attributed to the phase transition from the amorphous ice to the crystal ice in PMEA. 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 … See more Solidification from the melt Polymers are composed of long molecular chains which form irregular, entangled coils in the melt. Some polymers retain such a disordered structure upon freezing and readily convert … See more Thermal and mechanical properties Below their glass transition temperature, amorphous polymers are usually hard and brittle because of the low mobility of their molecules. Increasing the temperature induces molecular motion resulting in the typical rubber … See more The fraction of the ordered molecules in polymer is characterized by the degree of crystallinity, which typically ranges between 10% and 80%. Higher values are only achieved in materials having small molecules, which are usually brittle, or in samples stored for … See more • Liquid crystal polymer • Modeling of polymer crystals See more
Study on the double cold crystallization peaks of poly(ethylene ...
WebFeb 15, 2024 · Abstract. We performed kinetic Monte Carlo simulations of a lattice polymer model holding intramolecular and intermolecular activation barriers for polymer diffusion, on the basis of the previous dynamic Monte Carlo simulations of polymer crystallization. We explored the effective parameter sets for two barriers to freeze the amorphous polymers ... WebNov 26, 2013 · An increase in the rate constant and a decrease in the Avrami exponent suggested that cold crystallization is faster for a PTT film with a high overall molecular orientation and a change in growth geometry with orientation. This study demonstrates that overall molecular orientation affects the cold crystallization kinetics of amorphous ... how to use finviz for penny stocks
Crystallization in Polymer Materials - Advancing …
WebFeb 14, 2024 · This video will provide an overview of polymer crystallization upon heating, which is known as Cold Crystallization. WebApr 26, 2011 · Crystallization and melting latent heats were remarkably constant, independent of the heating rate. Kinetics parameters were determined using Ozawa … WebJun 1, 2016 · For semicrystalline thermoplastics, aside from pressure and shear, the temperature-time behavior while cooling the melt significantly affects the geometry and degree of ordered structures (e.g., spherulite size, degree of crystallization, and crystal modification) and, as a consequence, the resulting global component properties. … how to use finviz screener for swing trading