Abstract
To precisely investigate the nano-convergence, single-co-crystals of poly(ethylene glycol) (PEG) homopolymers with molecular weights of 5000, 35,000, and 100,000 g/mol and poly(ethylene glycol)-b-polystyrene (PEG-b-PS) and poly(ethylene glycol)-b-poly(methyl methacrylate) (PEG-b-PMMA) diblock copolymers were grown from melt state. In PEG35000/PEG5000-b-PS, PEG35000/PEG5000-b-PMMA, PEG100000/PEG5000-b-PS, and PEG100000/PEG5000-b-PMMA single-co-crystals, a considerable convergence was detected by atomic force microscopy (AFM) and the interface distribution function of small angle X-ray scattering (SAXS) analyses. Whereas in previously grown PEG5000/PEG5000-b-PS and PEG5000/PEG5000-b-PMMA single-co-crystals, the characteristics of PEG5000-b-PS and PEG5000-b-PMMA phase regions were independent of the presence of homo-PEG5000 chains. The convergence in melt-grown single-co-crystals was ascribed to the variance of molecular weight of PEG blocks in homopolymer and diblock copolymers. The higher molecular weight of homo-PEG chains were utilized for co-crystallization; the more significant convergence was observed between the substrates of bared and brush-covered phase regions. The lower increase in the thickness of PMMA-covered substrate in comparison with PS-covered substrate was attributed to higher osmotic pressure of PMMA chains on the surface of single crystals. Hence, to reach the equilibrium convergence in single-co-crystal structure, the decrease of PEG35000 and PEG100000 substrate thicknesses from respective homopolymer single crystals to PEG/PEG-b-PMMA single-co-crystals was higher than the decrease in thickness of PEG/PEG-b-PS ones.
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Alizadeh-Osgouei, M., Agbolaghi, S., Abbaspoor, S. et al. A subtle insight into nano-convergence of substrate thickness in melt-grown single-co-crystals. Colloid Polym Sci 294, 869–878 (2016). https://doi.org/10.1007/s00396-016-3842-6
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DOI: https://doi.org/10.1007/s00396-016-3842-6