Type

Journal Article

Authors

Michael A. Morris
Justin D. Holmes
Matthew T. Shaw
Cian Cummins
Atul Chaudhari
Tandra Ghoshal

Subjects

Chemistry

Topics
molecular weight annealing solvent atomic force microscopy afm polystyrene evolution thin films block copolymers

Morphological evolution of lamellar forming polystyrene-block-poly(4-vinylpyridine) copolymers under solvent annealing. (2016)

Abstract In this work, we are reporting a very simple and efficient method to form lamellar structures of symmetric polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) copolymer thin films with vertically (to the surface plane) orientated lamellae using a solvent annealing approach. The methodology does not require any brush chemistry to engineer a neutral surface and it is the block neutral nature of the film-solvent vapour interface that defines the orientation of the lamellae. The microphase separated structure of two different molecular weight lamellar forming PS-block-P4VP copolymers formed under solvent vapour annealing was monitored using atomic force microscopy (AFM) so as to understand the morphological changes of the films upon different solvent exposure. In particular, the morphology changes from micellar structures to well-defined microphase separated arrangements. The choice of solvent/s (single and dual solvent exposure) and the solvent annealing conditions (temperature, time etc.) has important effects on structural transitions of the films and it was found that a block neutral solvent was required to realize vertically aligned P4VP lamellae. The results of the structural variation of the phase separated nanostructured films through the exposure to ethanol are also described.
Collections Ireland -> University College Cork -> PubMed

Full list of authors on original publication

Michael A. Morris, Justin D. Holmes, Matthew T. Shaw, Cian Cummins, Atul Chaudhari, Tandra Ghoshal

Experts in our system

1
Michael A. Morris
University College Cork
Total Publications: 164
 
2
Justin D. Holmes
University College Cork
Total Publications: 287
 
3
Matthew T Shaw
University College Cork
Total Publications: 24
 
4
Cian Cummins
Trinity College Dublin
Total Publications: 23
 
5
Atul Chaudhari
University College Cork
Total Publications: 6
 
6
Tandra Ghoshal
University College Cork
Total Publications: 32