Ultra-high molecular weight linear coordination polymers with terpyridine ligands

Reece W. Lewis, Nino Malic, Kei Saito, Richard A. Evans, Neil R. Cameron

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Abstract

Ultra-high molecular weight (UHMW, Mn > 1000 kDa) polymeric drift control adjuvants (DCAs) for agricultural spraying are prone to mechanical degradation and rapidly lose performance. To overcome this, we have designed linear coordination polymers (LCPs) composed of 400 kDa telechelic bis-terpyridine end-functionalised polyacrylamide units, which 'self-heal' upon shearing through reformation of coordination bonds. After addition of Fe(ii) to dilute aqueous solutions of the terpyridine telechelics, UHMW LCPs were obtained as demonstrated by UV-vis spectroscopy, MALS GPC and intrinsic viscosity measurements. Importantly, these UHMW LCPs were shown to function as effective DCAs, reducing the formation of fine 'driftable' droplets during spray testing at concentrations as low as 100 ppm. Following mechanically-induced coordination bond-scission, the UHMW LCPs were found to recover up to 90% of their performance compared to un-sheared samples, at a rate dependent on the transition metal ion used to form the complex.

Original languageEnglish
Pages (from-to)6174-6183
Number of pages10
JournalChemical Science
Volume10
Issue number24
DOIs
Publication statusPublished - 28 Jun 2019

Cite this

Lewis, Reece W. ; Malic, Nino ; Saito, Kei ; Evans, Richard A. ; Cameron, Neil R. / Ultra-high molecular weight linear coordination polymers with terpyridine ligands. In: Chemical Science. 2019 ; Vol. 10, No. 24. pp. 6174-6183.
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abstract = "Ultra-high molecular weight (UHMW, Mn > 1000 kDa) polymeric drift control adjuvants (DCAs) for agricultural spraying are prone to mechanical degradation and rapidly lose performance. To overcome this, we have designed linear coordination polymers (LCPs) composed of 400 kDa telechelic bis-terpyridine end-functionalised polyacrylamide units, which 'self-heal' upon shearing through reformation of coordination bonds. After addition of Fe(ii) to dilute aqueous solutions of the terpyridine telechelics, UHMW LCPs were obtained as demonstrated by UV-vis spectroscopy, MALS GPC and intrinsic viscosity measurements. Importantly, these UHMW LCPs were shown to function as effective DCAs, reducing the formation of fine 'driftable' droplets during spray testing at concentrations as low as 100 ppm. Following mechanically-induced coordination bond-scission, the UHMW LCPs were found to recover up to 90{\%} of their performance compared to un-sheared samples, at a rate dependent on the transition metal ion used to form the complex.",
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Ultra-high molecular weight linear coordination polymers with terpyridine ligands. / Lewis, Reece W.; Malic, Nino; Saito, Kei; Evans, Richard A.; Cameron, Neil R.

In: Chemical Science, Vol. 10, No. 24, 28.06.2019, p. 6174-6183.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Ultra-high molecular weight linear coordination polymers with terpyridine ligands

AU - Lewis, Reece W.

AU - Malic, Nino

AU - Saito, Kei

AU - Evans, Richard A.

AU - Cameron, Neil R.

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N2 - Ultra-high molecular weight (UHMW, Mn > 1000 kDa) polymeric drift control adjuvants (DCAs) for agricultural spraying are prone to mechanical degradation and rapidly lose performance. To overcome this, we have designed linear coordination polymers (LCPs) composed of 400 kDa telechelic bis-terpyridine end-functionalised polyacrylamide units, which 'self-heal' upon shearing through reformation of coordination bonds. After addition of Fe(ii) to dilute aqueous solutions of the terpyridine telechelics, UHMW LCPs were obtained as demonstrated by UV-vis spectroscopy, MALS GPC and intrinsic viscosity measurements. Importantly, these UHMW LCPs were shown to function as effective DCAs, reducing the formation of fine 'driftable' droplets during spray testing at concentrations as low as 100 ppm. Following mechanically-induced coordination bond-scission, the UHMW LCPs were found to recover up to 90% of their performance compared to un-sheared samples, at a rate dependent on the transition metal ion used to form the complex.

AB - Ultra-high molecular weight (UHMW, Mn > 1000 kDa) polymeric drift control adjuvants (DCAs) for agricultural spraying are prone to mechanical degradation and rapidly lose performance. To overcome this, we have designed linear coordination polymers (LCPs) composed of 400 kDa telechelic bis-terpyridine end-functionalised polyacrylamide units, which 'self-heal' upon shearing through reformation of coordination bonds. After addition of Fe(ii) to dilute aqueous solutions of the terpyridine telechelics, UHMW LCPs were obtained as demonstrated by UV-vis spectroscopy, MALS GPC and intrinsic viscosity measurements. Importantly, these UHMW LCPs were shown to function as effective DCAs, reducing the formation of fine 'driftable' droplets during spray testing at concentrations as low as 100 ppm. Following mechanically-induced coordination bond-scission, the UHMW LCPs were found to recover up to 90% of their performance compared to un-sheared samples, at a rate dependent on the transition metal ion used to form the complex.

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