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Mega-supramolecules by end-association of very long telechelics: Highly potent rheology modifiers

Kornfield, Julia A. and Li, Boyu and Wei, Ming-Hsin (2014) Mega-supramolecules by end-association of very long telechelics: Highly potent rheology modifiers. PMSE Preprints . PMSE-52. ISSN 1550-6703. https://resolver.caltech.edu/CaltechAUTHORS:20140414-085916058

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Abstract

To favor linear end-to-end assocn. of telechelic polymers, very long chain lengths are used to inhibit cyclic configurations. Specifically, based on theor. predictions, telechelic polymers with high mol. wt. (Mw>400k g/mol) were synthesized to see if they could mimic multi-million MW polymers-and they did (in shear rheol. and mist suppression). Building on the Hilmyer- Macosco protocol for ROMP of cyclooctadiene with CTAs bearing functional groups, improvements in monomer purifn. enabled synthesis of telechelics with unprecedented length. The importance of chain length was confirmed by examg. telechelics from 75k to >400k g/mol. To test theor. expectations that donor-acceptor assocn. would yield more potent rheol. modifiers than self-assocn., carboxylate-functional telechelics were paired with amine-functional ones and they did increase viscosity more strongly than self-assocg. chains of similar assocn. energy, length and concn. Motivated by rheol. evidence of differences in supramol. structures, SANS measurements were performed and preliminary results correspond with theor. expectations.


Item Type:Article
ORCID:
AuthorORCID
Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2014 American Chemical Society.
Record Number:CaltechAUTHORS:20140414-085916058
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140414-085916058
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44909
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:14 Apr 2014 22:43
Last Modified:03 Oct 2019 06:24

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