Exploiting photoinduced reactions in polymer blends to create hierarchically ordered, defect-free materials

Langmuir : the ACS Journal of Surfaces and Colloids
Rui D M TravassoAnna C Balazs

Abstract

Computer simulations reveal how photoinduced chemical reactions can be exploited to create long-range order in binary and ternary polymeric materials. The process is initiated by shining a spatially uniform light over a photosensitive AB binary blend, which thereby undergoes both a reversible chemical reaction and phase separation. We then introduce a well-collimated, higher intensity light source. Rastering this secondary light over the sample locally increases the reaction rate and causes formation of defect-free, spatially periodic structures. These binary structures resemble either the lamellar or hexagonal phases of microphase-separated diblock copolymers. We measure the regularity of the ordered structures as a function of the relative reaction rates for different values of the rastering speed and determine the optimal conditions for creating defect-free structures in the binary systems. We then add a nonreactive homopolymer C, which is immiscible with both A and B. We show that this component migrates to regions that are illuminated by the secondary, higher intensity light, allowing us to effectively write a pattern of C onto the AB film. Rastering over the ternary blend with this collimated light now leads to hierarchic...Continue Reading

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Sep 16, 2005·The Journal of Chemical Physics·Rui D M TravassoAnna C Balazs
Nov 16, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Rui D M TravassoAnna C Balazs

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Citations

Oct 25, 2006·Annual Review of Physical Chemistry·Anna C Balazs
Jan 30, 2009·Physical Chemistry Chemical Physics : PCCP·Vladimir K Vanag, Irving R Epstein
Dec 21, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Ya LiuAnna C Balazs
Jul 16, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Ya LiuAnna C Balazs
Aug 7, 2007·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Olga Kuksenok, Anna C Balazs
Aug 16, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Olga KuksenokAnna C Balazs
Jan 29, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Olga Kuksenok, Anna C Balazs
Nov 21, 2007·The Journal of Physical Chemistry. B·Goundla SrinivasJed W Pitera

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