Rheology of associative polymer solutions

Chassenieux, Christophe; Nicolai, Taco; Benyahia, Lazhar

doi:10.1016/j.cocis.2010.07.007

Cited by 231 publications

(210 citation statements)

References 122 publications

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“…Typical rheology modifiers used are a,u-double hydrophobically end-capped hydrophilic polymers. [1][2][3][4][5][6][7][8][9][10][11] So far, these have been mostly polyethylene oxides (PEOs) end-capped with n-alkyl ethers, n-alkyl urethanes (HEURs), and fatty acid esters or, alternatively, PEOs bearing short hydrophobic polymer end blocks. 8 The thickening effect of these compounds has been studied intensely.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4]8,[10][11][12][13][14][15] The hydrophobic end groups function as ''stickers'' and the viscosity increase can be correlated to their length. 1,4,8,13,15 In the case of linear polymers, it is obvious that one polymer molecule can link not more than two micelles. The system becomes much more complex, once branched hydrophilic polymers with 3 or more hydrophobic sticker end groups are used.…”

Section: Introductionmentioning

confidence: 99%

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One-step RAFT synthesis of well-defined amphiphilic star polymers and their self-assembly in aqueous solution

et al. 2012

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Multifunctional chain transfer agents for RAFT polymerisation were designed for the one-step synthesis of amphiphilic star polymers. Thus, hydrophobically end-capped 3-and 4-arm star polymers, as well as linear ones for reference, were made of the hydrophilic monomer N,N-dimethylacrylamide (DMA) in high yield with molar masses up to 150 000 g mol À1, narrow molar mass distribution (PDI # 1.2) and high end group functionality ($90%). The associative telechelic polymers form transient networks of interconnected aggregates in aqueous solution, thus acting as efficient viscosity enhancers and rheology modifiers, eventually forming hydrogels. The combination of dynamic light scattering (DLS), small angle neutron scattering (SANS) and rheology experiments revealed that several molecular parameters control the structure and therefore the physical properties of the aggregates. In addition to the size of the hydrophilic block (maximum length for connection) and the length of the hydrophobic alkyl chain ends (stickiness), the number of arms (functionality) proved to be a key parameter.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

One-step RAFT synthesis of well-defined amphiphilic star polymers and their self-assembly in aqueous solution

et al. 2012

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“…Both of these form bridged multiplets which can consist of intra-and intermolecular associations. [128,129] Reportedly, the multi-sticker polymers have enhanced viscosity improvement over telechelics due to the increase in the number of bridges formed across the multiplets. [130] Similarly, the combination of the two (multisticker with hydrophobic groups at the end) is said to be optimal for polymers in EOR and so also could be beneficial as DCAs.…”

Section: Future Directionsmentioning

confidence: 99%

Polymeric Drift Control Adjuvants for Agricultural Spraying

Lewis

Evans

Malic

et al. 2016

Macro Chemistry & Physics

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---------The movement of a pesticide or herbicide to an off-target site during agricultural spraying can cause injury to wildlife, plants and contamination of surface water. This phenomenon is known as spray drift and can be controlled by spraying during favorable environmental conditions, and by using low drift nozzles and drift control adjuvants (DCAs). Polymeric DCAs are the most common type of DCA and function by increasing the droplet size produced during spraying. There are, however, two main drawbacks of polymeric DCAs; they are prone to mechanical degradation during spraying which reduces their performance and they can produce oversized drops which reduces the efficacy of the spray. In this review, existing DCA technology is reviewed including the mechanism through which they function.This then provides a platform for the discussion of novel polymeric architectures which have currently not been applied in DCA formulations.-2 -

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“…These polymers form flower-like micelles at low concentrations, begins to bridge as concentration is increased, and eventually form soft gels [1].…”

Section: Introductionmentioning

confidence: 99%

“…Associative telechelic polymers, especially hydrophobically modified poly(ethylene oxides) (PEOs), have been widely studied and applied to solutions to control rheological properties such as viscosity and gelation and shear-thinning and thickening behavior [1]. These polymers form flower-like micelles at low concentrations, begins to bridge as concentration is increased, and eventually form soft gels [1].…”

Section: Introductionmentioning

confidence: 99%

A Molecular Picture for the Thermo-Reversibility of Gels Formed by Isophthalic Acid-Ended Telechelic Polymers

Kim

Kornfield

2015

MRS Proc.

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We demonstrate that isophthalic acid-ended telechelic poly(1,5-cyclooctadiene)s (APCODs) form thermo-reversible gels in non-polar solvent with a unique molecular mechanism for their thermo-reversibility. Like other associative telechelic polymers, A-PCODs form "flower-like" micelles at low concentration and form gels through bridging at higher concentration which exhibit linear viscoelasticity. However, unlike the widely studied hydrophobically end-capped PEOs, APCODs show clear thermo-reversibility in viscosity and dynamic modulus around 30 C due to the hydrogen-bonding end groups. In addition, they differ from other reported thermo-reversible gelators (eg. Pluronics, PNIPAm containing block copolymers, etc.): neither the end group nor the backbone in the present system has a critical solution temperature within the measured temperature -reversibility. To obtain a molecular picture of the mechanism, rheology and small angle neutron scattering (SANS) studies were implemented. Topological changes above the transition temperature (30 C) were observed in both oscillatory rheology and SANS. SANS reveals that the size of clusters, which are formed by interacting micelles, depends highly on temperature (T) but independent of polymer concentration. These results cannot be explained by current theories on associative telechelic polymers which assume constant and large aggregation number of end groups at all temperatures and concentrations. We hypothesize that the temperature-sensitive solgel transition is due to a decrease in aggregation number for T above the critical temperature in our system, and this temperature-dependence of aggregation number is further determined by the chemical structure and hydrogen-bonding property of isophthalic acid ends.

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Rheology of associative polymer solutions

Cited by 231 publications

References 122 publications

One-step RAFT synthesis of well-defined amphiphilic star polymers and their self-assembly in aqueous solution

One-step RAFT synthesis of well-defined amphiphilic star polymers and their self-assembly in aqueous solution

Polymeric Drift Control Adjuvants for Agricultural Spraying

A Molecular Picture for the Thermo-Reversibility of Gels Formed by Isophthalic Acid-Ended Telechelic Polymers

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