Characterization of hetero-block copolymers by the log-normal distribution model

Monteiro, Michael J. and Gavrilov, Mikhail (2016) Characterization of hetero-block copolymers by the log-normal distribution model. Polymer Chemistry, 7 17: 2992-3002. doi:10.1039/c6py00345a


Author Monteiro, Michael J.
Gavrilov, Mikhail
Title Characterization of hetero-block copolymers by the log-normal distribution model
Journal name Polymer Chemistry   Check publisher's open access policy
ISSN 1759-9962
1759-9954
Publication date 2016-05-07
Year available 2016
Sub-type Article (original research)
DOI 10.1039/c6py00345a
Open Access Status Not Open Access
Volume 7
Issue 17
Start page 2992
End page 3002
Total pages 11
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2017
Language eng
Formatted abstract
The generation of complex multi-arm and multi-composition polymer structures consisting of blocks, stars and dendrimers have found potential over a broad range of applications. Characterization of such structures is difficult with conventional methods (e.g. NMR and MALDI-ToF), and in many cases, the only method left to characterize the polymer structure is via size exclusion chromatography (SEC). An issue with SEC is that polymers with different chemical compositions have different responses from the SEC concentration detectors (e.g. refractive index). In this paper, through the mixing of two different homopolymers and before and after a ‘click’ reaction of these homopolymers to form a block copolymer, we demonstrate an accurate method to determine the true weight fraction of each polymer species from the SEC weight distribution. We derive equations that allow conversion of the true weight fraction (wp) of a homopolymer or block to what would be determined directly from the RI-SEC (wappp) by using the individual polymer's dn/dc values. The log-normal distribution model allowed an excellent fit to all the RI-SEC chromatograms, and further allowed accurate determination of ‘click’ or coupling efficiencies of various homopolymers.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Australian Institute for Bioengineering and Nanotechnology Publications
 
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