Affordable Access

deepdyve-link
Publisher Website

Molecular exchange in spherical diblock copolymer colloids synthesised by polymerisation-induced self-assembly.

Authors
  • Smith, Gregory N1
  • Grillo, Isabelle2
  • Hallett, James E3
  • 1 Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, United Kingdom; Niels Bohr Institute, University of Copenhagen, H. C. Ørsted Institute, Universitetsparken 5, 2100 Copenhagen Ø, Denmark. Electronic address: [email protected] , (Denmark)
  • 2 Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France. , (France)
  • 3 H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom. , (United Kingdom)
Type
Published Article
Journal
Journal of Colloid and Interface Science
Publisher
Elsevier
Publication Date
Nov 01, 2020
Volume
579
Pages
243–249
Identifiers
DOI: 10.1016/j.jcis.2020.06.022
PMID: 32592989
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

To study molecular exchange between colloids requires the preparation of suitably labelled species. Deuterium isotopic labelling has been used to prepare two chemically identical yet isotopically distinguishable poly(lauryl methacrylate)-poly(methyl methacrylate) (PLMA-PMMA) diblock copolymer colloids by polymerisation-induced self-assembly (PISA) directly in an alkane solvent. Molecular exchange should be detectable by performing small-angle neutron scattering (SANS) measurements on the dispersions. SANS measurements were performed on fully hydrogenous PLMA39-PMMA57 and deuterated core PLMA39-P(MMA-d8)57 colloids. They were mixed in equal amounts and heated to determine if molecular exchange occurred. PISA syntheses are often thermally initiated, and diblock copolymers self-assemble at elevated temperature, making this an important parameter to study. Experimental data for the mixture were compared to predicted curves for exchanged and non-exchanged colloids. The scattering of a mixture of fully hydrogenous and deuterated core copolymers does not disappear upon molecular exchange, due to the remaining contrast between the stabiliser and the core and solvent even after the cores fully exchange. By simultaneously fitting the SANS data from dispersions before mixing and using these parameters to constrain fitting the SANS data of mixtures, the molecular exchange between diblock copolymer micelles upon heating is clearly observed. Copyright © 2020 The Author(s). Published by Elsevier Inc. All rights reserved.

Report this publication

Statistics

Seen <100 times