Morphological evolution in dewetting polystyrene/polyhedral oligomeric silsesquioxane thin film bilayers

Langmuir : the ACS Journal of Surfaces and Colloids
Rituparna PaulAlan R Esker

Abstract

Morphological evolution in dewetting thin film bilayers of polystyrene (PS) and a polyhedral oligomeric silsesquioxane (POSS), trisilanolphenyl-POSS (TPP), was studied as a function of annealing temperature and annealing time. The results demonstrate unique dewetting morphologies in PS/TPP bilayers at elevated temperatures that are significantly different from those typically observed in dewetting polymer/polymer bilayers. During temperature ramp studies by optical microscopy (OM) in the reflection mode, PS/TPP bilayers form cracks with a weak optical contrast at approximately 130 degrees C. The crack formation is attributed to tensile stresses within the upper TPP layer. The weak optical contrast of the cracks observed in the bilayers for annealing temperatures below approximately 160 degrees C is consistent with the cracking and dewetting of only the upper TPP layer from the underlying PS layer. The optical contrast of the morphological features is significantly enhanced at annealing temperatures of >160 degrees C. This observation suggests dewetting of both the upper TPP and the lower PS layers that results in the exposure of the silicon substrate. Upon annealing the PS/TPP bilayers at 200 degrees C in a temperature jump exp...Continue Reading

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Citations

Sep 23, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Stuart C ThickettChiara Neto
Jan 17, 2013·The Journal of Chemical Physics·Kartick MondalDipankar Bandyopadhyay
Dec 18, 2015·Journal of Colloid and Interface Science·Abhiram HensDipankar Bandyopadhyay
Sep 29, 2015·Soft Matter·Rabibrata Mukherjee, Ashutosh Sharma
Mar 19, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Abhiram HensDipankar Bandyopadhyay
May 15, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Dipankar BandyopadhyayP Dinesh Sankar Reddy
Jul 1, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Wen YinAlan R Esker
Apr 11, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Dipankar BandyopadhyayChaitanya Rastogi
Jul 25, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Kentaro YamamotoKeiji Tanaka

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