Influence of progressive cross-linking on dewetting of polystyrene thin films

Langmuir : the ACS Journal of Surfaces and Colloids
Samer Al AkhrassG Reiter

Abstract

We present dewetting experiments on thin polymer films as a function of cross-linking density. Covalent cross-links were obtained in the glassy state on the basis of azide photochemistry of linear random copolymers of styrene and p-(azidomethyl)styrene, i.e., 106 and 2500 kg/mol with 7% and 1% azide functionality among the polymer backbone, respectively. Upon ultraviolet radiation, azides generate highly unstable nitrene radicals which react with the surrounding polymer backbone, yielding covalent cross-links. We determined the probability for film rupture, defined by the number of holes formed per unit area, and the relaxation time (tauw) of residual stresses which resulted from the film preparation process. For the lower molar mass polymer studied and for azide conversion rates lower than 60%, only partial cross-linking occurred. The effective molar mass of the polymer increased, and consequently, an increase in tauw was observed. The increase in tauw was accompanied by a decrease in hole density, indicating that the still present residual stresses in the films were not able anymore to rupture the films at the high probability of un-cross-linked polymers. For high conversion (>60%), cross-linking was significant enough to lea...Continue Reading

References

Jan 6, 1992·Physical Review Letters·G Reiter
Sep 4, 2003·Journal of the American Chemical Society·Karen L BuchmuellerKevin M Weeks
Apr 12, 2005·Science·Du Yeol RyuThomas P Russell
Jun 15, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·R S KrishnanB Van Horn
Feb 24, 2006·The European Physical Journal. E, Soft Matter·H Bodiguel, C Fretigny
Apr 12, 2006·Physical Review Letters·M H YangA C-M Yang
Aug 16, 2006·Physical Review Letters·Thomas Vilmin, Elie Raphaël
Aug 23, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Gregory T CarrollJeffrey T Koberstein
Dec 6, 2006·The European Physical Journal. E, Soft Matter·T Vilmin, E Raphaël
Aug 7, 2007·Physical Review Letters·Pascal DammanGünter Reiter

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Citations

Oct 21, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Andrew M TelfordChiara Neto
Mar 26, 2011·ACS Nano·Igor SiretanuCarlos Drummond
Aug 14, 2015·Chemical Reviews·Sudheendran MavilaN Gabriel Lemcoff
Mar 25, 2011·Macromolecular Rapid Communications·Sandra BinauldEric Drockenmuller
Nov 10, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Cédric TissandierThierry Hamaide
Sep 29, 2015·Soft Matter·Rabibrata Mukherjee, Ashutosh Sharma
Feb 2, 2017·Beilstein Journal of Organic Chemistry·Atsushi TamuraNobuhiko Yui
Mar 7, 2013·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Samantha K SchmittPadma Gopalan
Feb 24, 2021·ACS Applied Materials & Interfaces·Xavier ChevalierMarc Zelsmann
Mar 26, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Annalisa CalòFabio Biscarini
Sep 30, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Roxana-Viorela OstaciEric Drockenmuller
Jul 1, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Christian RossnerGerald Kothleitner

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