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In the present work, crystallization in melts and poor-solvent solutions ofsemiflexible polymers with different concentration was studied by means ofdissipative particle dynamics simulation technique. We use a coarse-grainedpolymer model trying to catch general principles of crystallization in suchsystems on large time and length scales. We observe the crystallization processstarting from an initial randomly prepared system with different polymer volumefractions in a poor solvent. Because the solvent is very poor, the macrophasepolymer-solvent separation takes place very fast and is accompanied by partialpolymer crystallization. We have found that the overall crystalline fraction atthe end of crystallization process decreases upon increasing the polymer volumefraction in the initial randomly prepared system, while the steady-statecrystallization speed is almost the same at polymer volume fractions largerthan 50\%. At the same time, the average crystallite size differs considerablyand has a maximum value in the systems with 90\% polymer volume fraction. Weassume that this polymer concentration is an optimal value in a sense of abalance between the amount of polymer material available for increasingcrystallite size and chain entanglements preventing crystallites growth andmerging.

Crystallization in melts and poor-solvent solutions of semiflexible polymers: extensive DPD study