Structural studies of three-arm star block copolymers exposed to extreme stretch suggests persistent polymer tube

Kell Mortensen*, Anine L. Borger, Jacob J.K. Kirkensgaard, Christopher J. Garvey, Kristoffer Almdal, Andriy Dorokhin, Qian Huang, Ole Hassager

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

We present structural SANS-studies of a three-armed polystyrene star polymer with short deuterated segments at the end of each arm. We show that the form factor of the three-armed star molecules in the relaxed state agrees with that of the random phase approximation of Gaussian chains. Upon exposure to large extensional flow conditions, the star polymers change conformation resulting in a highly stretched structure that mimics a fully extended three-armed tube model. All three arms are parallel to the flow, one arm being either in positive or negative stretching direction, while the two other arms are oriented parallel, right next to each other in the direction opposite to the first arm.
Original languageEnglish
Article number207801
JournalPhysical Review Letters
Volume120
Number of pages6
ISSN0031-9007
DOIs
Publication statusPublished - 2018

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