NDLI: A subtle insight into nano-convergence of substrate thickness in melt-grown single-co-crystals

Content Provider	Springer Nature Link
Author	Alizadeh Osgouei, M. Agbolaghi, S. Abbaspoor, S. Abbasi, F.
Copyright Year	2016
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.
Starting Page	869
Ending Page	878
Page Count	10
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	294
Issue Number	5
e-ISSN	14351536
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-02-13
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Single-co-crystal PEG-b-PS PEG-b-PMMA Convergence Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Characterization and Evaluation of Materials Physical Chemistry Food Science Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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