Synthesis, characterization and rheological properties of multiblock associative copolymers by RAFT technique

Muñoz-López, Cesar Nadem; Díaz-Silvestre, Sergio; Telles-Padilla, J. Guadalupe; Rivera-Vallejo, Claudia; Thomas, Claude St; Jiménez‐Regalado, Enrique J.

doi:10.1007/s00289-019-02867-z

Cited by 9 publications

(6 citation statements)

References 38 publications

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“…On the basis of the rheological properties of associating polyelectrolyte copolymers recently revealed by our group, 46,47 thus iterate polymerization reactions were carried out under similar conditions for obtaining four (co)polymers with identical structural properties such as: macroRAFT, triblock, pentablock and heptablock copolymers. Reactions were performed via RAFT polymerization at a temperature of 25°C using redox initiators giving access to amphiphilic copolymers composed of hydrophobic block (LA) and hydrophilic chains (AA‐co‐EA) (see Figure 1).…”

Section: Resultsmentioning

confidence: 99%

“…The synthesis of associating multiblock polyelectrolytes with similar molecular weight ( M n ) was carried out as reported elsewhere 46 . The resultant polymers from each step revealed different topology such as: macroRAFT, triblock (TBC), pentablock (PBC) and heptablock (HBC), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Otherwise, some reports are also disclosed the preparation of associative polyelectrolytes employing the reversible deactivation radical polymerization techniques which conducted to the control on the polymerization process giving access to well‐structured polymers. In the last years, Jiménez‐Regalado et al reported an easy pathway for synthesizing well‐defined associating multiblock polyelectrolytes through the reversible addition‐fragmentation chain transfer (RAFT) polymerization 46,47 . The resultant polymers, containing a defined length hydrophobic block (polylauryl acrylate‐PLA or polystearyl methacrylate‐PSMA) distributed within the hydrophilic backbone (PAA‐ co ‐polyethyl acrylate [PEA]), were obtained through the solution polymerization using the both thermal and redox initiation.…”

Section: Introductionmentioning

confidence: 99%

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Impact of additives on the rheological properties of associating water‐soluble multiblock polyelectrolytes

Muñoz-López¹,

Thomas

Garcı́a-Cerda³

et al. 2021

J of Applied Polymer Sci

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The impact of additives on the rheological behavior of four associating water‐soluble multiblock polyelectrolytes previously synthesized via reversible addition‐fragmentation chain transfer (RAFT) polymerization was described. These polyelectrolytes contained different number of blocks ranged from 1 to 7 divided into hydrophilic and hydrophobic. The rheological analyses of polymers were performed at 25°C at a given concentration (0.1–15 wt%) in the presence of sodium chloride (NaCl) 0.1–0.5 M, sodium dodecyl sulfate (SDS) 2–10 mM or a mixture of both. Data demonstrated an increase in the viscosity of macroRAFT (ɳ = 0.002–9 Pa·s) and triblock copolymer‐TBC (ɳ = 0.003–0.04 Pa·s) versus the concentration of NaCl. Meanwhile, the viscosity of penta and heptablock copolymer exhibited a diminution whatever the (NaCl) used. Results from the rheological analyses of the associative polyelectrolytes at different (SDS) revealed that the viscosity of macroRAFT and triblock copolymer was kept constant in spite of the increment of the (SDS) while the viscosity of PBC and HBC displayed a pronounced diminution at the lower (SDS). Finally, the results from the rheological analyses of these polyelectrolytes versus a mixture of NaCl‐SDS showed a diminution in the viscosity of these solutions at any concentration of additives.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of additives on the rheological properties of associating water‐soluble multiblock polyelectrolytes

Muñoz-López¹,

Thomas

Garcı́a-Cerda³

et al. 2021

J of Applied Polymer Sci

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“…[6] In an aqueous media, the hydrophobic groups distributed into the backbone of associating copolymers are able to associate each other for inducing the formation of reversible physical networks which could conducted to an increase in the viscosity of the polymeric solution. Based on the both composition and chemical structure, some copolymers are considered as smart materials due to their reactions in response to the exposition to an external physical or chemical stimuli such as: temperature, [7,8] pH, [9,10] among others. The most common and relevant thermo-associative (co)polymers reported in the literature often contained the presence of polyN-isopropylacrylamide (PNIPAM) block.…”

Section: Introductionmentioning

confidence: 99%

Thickening behavior of thermo‐associative water soluble multiblock copolymers under redox RAFT polymerization

Maldonado‐Textle

Jiménez‐Regalado

Thomas

2022

Polymer Engineering & Sci

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In this study, the synthesis of thermo‐associative water soluble multiblock copolymers is reported. A trithiocarbonate functionalized polyacrylamide (PAM) was prepared and subsequently utilized in the preparation of three series of thermo‐associative copolymers by addition of N‐isopropylacrylamide (NIPAM) and acrylamide (AM) until reaching a nonablock copolymer with four thermo‐associative blocks distributed into the backbone of polymer. Reactions were performed at 25 °C using a tertbutyl hydroperoxyde (TBHP) and ascorbic acid (As.Ac.) as redox initiator, and S,S′‐Bis (α,α’‐dimethyl‐α”‐acetic acid)‐trithiocarbonate (DMAT) as chain transfer agent. The targeted molecular weight (MnTheo) of PAM was maintained constant (10,000 g/mol) while the expected Mntheo of polyN‐isopropylacrylamide (PNIPAM) was varied from 10,000, 15,000, and 20,000 g/mol, respectively. The synthesized copolymers were characterized by infrared (IR), nuclear magnetic resonance (NMR), size exclusion chromatography (SEC) for determining the structure of materials, whereas ultraviolet (UV) analysis allowed to get access to the cloud point temperature (Tcp) of polymers. Rheological analyses were carried out for examining the effect of thermo‐responsive block on the thickening behavior of aqueous polymer solutions. These analyses were performed at different concentration from 1 to 20 wt. % varying the temperature of measurements from 25, 30, 40, 50, 60, and 70 °C. Results confirmed the influence of the size of thermo‐responsive blocks on the viscosity of these copolymers.

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“…Muñoz-López et al . [ 17 ] reported an associating multi-block copolymer electrolytes mediated by radical addition-fragmentation chain transfer technique. The influence of hydrophobic length was illustrated to play an essential role in the rheological properties of copolymers.…”

Section: Introductionmentioning

confidence: 99%

A novel hydrophobically associating water-soluble polymer used as constant rheology agent for cement slurry

Liu

et al. 2022

R. Soc. open sci.

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During the process of well cementing in deep water, the cement slurry experiences a wide range of temperature variation from low temperature at seabed to high temperature in downhole. The elevated temperature affects the rheology of cement slurry. The change of rheology of cement slurry could influence the safety of cementing operation. The aim of this paper is to develop a new kind of hydrophobically associating water-soluble polymer (NHAWP) as an additive to prepare a constant rheology oil well cement slurry, which can be used at temperature range from 4°C to 90°C. The acrylamide, 2-acrylamide-2-methylpropionic acid and stearyl methylacrylate were applied to synthesize the NHAWP by the inverse microemulsion polymerization. Test results indicate that the critical association temperature of NHAWP is 45°C. The critical association temperature is independent of NHAWP concentration, salt concentration and alkalinity of solution. When the temperature is below 45°C, NHAWP shows little influence on the viscosity of solution. When the temperature is above 45°C, the NHAWP forms spatial network structure by intermolecular hydrophobic association and thus increases the viscosity of solution significantly. The NHAWP also displays good thermal stability and excellent salt and alkali resistance properties. In addition, the NHAWP shows nearly no negative influence on the basic properties of cement slurry, which indicates that the NHAWP can be used as a constant rheology agent to prepare a cement slurry with constant rheology in the temperature range of 4°C to 90°C.

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Synthesis, characterization and rheological properties of multiblock associative copolymers by RAFT technique

Cited by 9 publications

References 38 publications

Impact of additives on the rheological properties of associating water‐soluble multiblock polyelectrolytes

Impact of additives on the rheological properties of associating water‐soluble multiblock polyelectrolytes

Thickening behavior of thermo‐associative water soluble multiblock copolymers under redox RAFT polymerization

A novel hydrophobically associating water-soluble polymer used as constant rheology agent for cement slurry

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