Abstract
A relaxation model for the structure ripening under annealing of a microphase-separated polymer film has been developed. Equations have been derived that describe the appearance and annihilation of defects in the kinetically controlled mode based on the experimental data on the hexagonal structure evolution. Using that equations, the time dependences of the defect-free area size have been analyzed. It has been found that the predominance of the defect annihilation upon their triple contact leads to the power-law dependence of the orientation correlation length ξor ~ t1/4, which is observed experimentally at high annealing temperatures. A more detailed analysis of the evolution of two types of defects (dislocations and disclinations) shows that this dependence can also be realized in a model that takes into account the annihilation of disclination pairs and quadruples providing that dislocations influence this process. The results demonstrate that macrokinetic models can describe structural rearrangements in block copolymer films.
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Funding
E.N. Govorun and Y.V. Kudryavtsev acknowledge the Russian Foundation for Basic Research for financial support (project 16-03-00531). Numerical calculations were performed by D.A. Filatov with financial support of the Ministry of Science and Higher Education of the Russian Federation.
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Filatov, D.A., Govorun, E.N. & Kudryavtsev, Y.V. Kinetic Model of Structural Relaxation in Diblock Copolymer Film. Polym. Sci. Ser. A 62, 140–148 (2020). https://doi.org/10.1134/S0965545X20010046
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DOI: https://doi.org/10.1134/S0965545X20010046