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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. Abstracts of Papers of the American Chemical Society, 247 . 52-PMSE. ISSN 0065-7727.

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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 difference in supramol. structures, SANS measurements were performed and preliminary results correspond with theor. expectations.

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Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2014 American Chemical Society.
Record Number:CaltechAUTHORS:20150316-085805066
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55770
Deposited By: Tony Diaz
Deposited On:16 Mar 2015 17:47
Last Modified:03 Oct 2019 08:08

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