A new thermoresponsive polymer of poly(N-acryloylsarcosine methyl ester) with a tunable LCST

Chen, Shengli; Wang, Ke; Zhang, Wangqing

doi:10.1039/c7py00274b

Cited by 50 publications

(56 citation statements)

References 78 publications

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“…See the 1 H NMR spectra in Figure S1 . As shown by the 1 H NMR spectra, imine-enamine tautomerism in the NMAAEA occurs similarly to those described elsewhere [ 72 ].…”

Section: Methodssupporting

confidence: 82%

“…See the 1 H NMR spectra in Figure S1. As shown by the 1 H NMR spectra, imine-enamine tautomerism in the NMAAEA occurs similarly to those described elsewhere [72]. Initially, three polymers with similar DP, e.g., PNMAAEA198, PNEAAEA194, and PNPAAEA190, were synthesized under [monomer]0:[ECT]0:[AIBN]0 = 1000:5:1 at an almost 100% monomer conversion to check the polymerization conditions.…”

Section: Introductionsupporting

confidence: 69%

“…The detailed values for the three polymers are summarized in Table S3. NaH2PO4 (kosmotrope) [22,61,64,72,79,80], are selected. As shown in Figure 7, the Tcps of the three thermoresponsive homopolymers increase with NaSCN concentration and decrease with NaH2PO4 concentration.…”

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confidence: 99%

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Thermoresponsive Polymers of Poly(2-(N-alkylacrylamide)ethyl acetate)s

et al. 2020

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Thermoresponsive poly(2-(N-alkylacrylamide) ethyl acetate)s with different N-alkyl groups, including poly(2-(N-methylacrylamide) ethyl acetate) (PNMAAEA), poly(2-(N-ethylacrylamide) ethyl acetate) (PNEAAEA), and poly(2-(N-propylacrylamide) ethyl acetate) (PNPAAEA), as well as poly(N-acetoxylethylacrylamide) (PNAEAA), were synthesized by solution RAFT polymerization. Unexpectedly, it was found that there are induction periods in the RAFT polymerization of these monomers, and the induction time correlates with the length of the N-alkyl groups in the monomers and follows the order of NAEAA < NMAAEA < NEAAEA < NPAAEA. The solubility of poly(2-(N-alkylacrylamide) ethyl acetate)s in water is also firmly dependent on the length of the N-alkyl groups. PNPAAEA including the largest N-propyl group is insoluble in water, whereas PNMAAEA and PNEAAEA are thermoresponsive in water and undergo the reversible soluble-to-insoluble transition at a critical solution temperature. The cloud point temperature (Tcp) of the thermoresponsive polymers is in the order of PNEAAEA < PNAEAA < PNMAAEA. The parameters affecting the Tcp of thermoresponsive polymers, e.g., degree of polymerization (DP), polymer concentration, salt, urea, and phenol, are investigated. Thermoresponsive PNMAAEA-b-PNEAAEA block copolymer and PNMAAEA-co-PNEAAEA random copolymers with different PNMAAEA and/or PNEAAEA fractions are synthesized, and their thermoresponse is checked.

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“…See the 1 H NMR spectra in Figure S1 . As shown by the 1 H NMR spectra, imine-enamine tautomerism in the NMAAEA occurs similarly to those described elsewhere [ 72 ].…”

Section: Methodssupporting

confidence: 82%

Section: Introductionsupporting

confidence: 69%

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Thermoresponsive Polymers of Poly(2-(N-alkylacrylamide)ethyl acetate)s

et al. 2020

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“…However, difficulties in controlling PNIPAM hydrogel properties, such as volume swelling ratio, adsorption rate, or slow response time, for optimum detection restrict their further applications in in situ water-soluble compound detection. [31] The composition of the intercalated MoS 2 nanosheets was confirmed via Raman spectroscopy (Figure 2a). Consequently, MBAMS improves the reactivity and selectivity of the hydrogel toward the target substance by enabling PNIPAM-target substance-MBAMS binding.…”

Section: Control Of Volume-responsive Properties Of Hydrogels Throughmentioning

confidence: 99%

“…[30] For the preparation of MBAMS-PNIPAM hydrogel, we first prepared a well-dispersed solution of MoS 2 nanosheets with a thickness of several molecular layers with the Li intercalation method ( Figure S1a, Supporting Information). [31] The composition of the intercalated MoS 2 nanosheets was confirmed via Raman spectroscopy (Figure 2a). We observed two main Raman peaks E 1 2g and A 1g , which correspond to the in-plane optical vibration of the Mo-S atoms in the basal plane and The schematic illustration for the adsorption and shrink mechanism of phenol on MBAMS-PNIPAM hydrogel.…”

Section: Control Of Volume-responsive Properties Of Hydrogels Throughmentioning

confidence: 99%

Control of Volume‐Responsive Properties of Hydrogels through Molybdenum Disulfide Nanosheet Incorporation

Kim

Lee

2019

Adv Materials Technologies

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efforts have been devoted to remove the aforementioned limitations of the PNIPAM hydrogel sensors by incorporating nanomaterials. [17,18] Recently, low dimensional nanomaterials with a large specific surface area such as carbon nanotubes and graphene oxide have been incorporated to hydrophilic polymers such as PNIPAM, chitosan, and polyacrylic acid hydrogels to enhance the adsorption of substances and chemical storage capacity. [19][20][21] In this study, we demonstrate a composite hydrogel of MoS 2 nanosheets functionalized with 4-mercaptobenzoic acid (MBA) and PNIPAM (MBAMS-PNIPAM hydrogel) for the detection of water-soluble phenols. Herein, MoS 2 nanosheets have been shown to be promising candidate components for various fields, such as the detection of water-soluble substances, humidity, and gas species. [22][23][24][25][26] MBAMS was prepared via MoS 2 exfoliation processes and subsequent chemical functionalization process with 4-MBA for realizing the reactivity and selectivity toward the target substance. Here, 4-MBA, a small ligand molecule with a thiol and a carboxyl group, was used to modify the surface of MoS 2 nanosheets. We also verified that we can adjust the phenol detection range by controlling the adsorption and responsivity of the MBAMS-PNIPAM hydrogel through the amount of the incorporated MoS 2 . In addition, we demonstrate an in situ detection strategy of watersoluble phenols by developing an effective transduction strategy to convert the hydrogel volume change into electronic signals. The novel transduction strategy uses a liquid metal-based capacitive transduction method. Furthermore, combined with a handheld signal processor and home-built data-visualization software, we demonstrate a portable detection instrument for phenolic molecules. The instrument successfully detected resorcinol concentrations as low as 10 mg L −1 . As an example, compared to other sensors using optical or electrical mechanisms, [27][28][29] our hydrogel can be readily integrated with existing ducts, containers, or pipe systems without any additional process. Furthermore, above certain concentrations, the hydrogel color change will be large enough to enable detection with the naked eye. As this strategy enables the simple, one-step, and easy detection, it can be easily extended to detect water-soluble chemicals other than phenols in the future. Figure 1a depicts the molecular structure of MBAMS-PNIPAM hydrogels and the detection mechanism of phenols. The surface of MoS 2 was functionalized with 4-MBA molecules to enhance the reactivity and selectivity toward the target phenolic substance and stabilize the hydrogel structure. The target phenolic molecule A composite structure of molybdenum disulfide (MoS 2 ) nanosheets and poly(N-isopropylacrylamide) (PNIPAM) hydrogel is demonstrated for the selective detection of phenols. The incorporation of MoS 2 with a hydrogel system enhances its adsorption and its volume-change response to phenols. It is verified that the phenol detection range can be adjusted by controlling the ...

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Thermoresponsive behavior of graft copolymers based on poly(N,N‐dimethylacrylamide‐co‐diacetoneacrylamide) side chains

Guo

Song

Feng

et al. 2018

J of Applied Polymer Sci

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A thermoresponsive graft copolymer was synthesized through free radical copolymerization and a “graft onto” method in aqueous solution. The primary structure of the graft copolymer is constituted of a partially hydrolyzed polyacrylamide (HPAM) backbone and thermosensitive side chains [amino‐terminated poly(N,N‐dimethylacrylamide‐co‐diacetone acrylamide) or P(DMA‐co‐DAAM)] with molecular weight around 105 g/mol. The 1H‐NMR spectra at various temperatures showed the temperature of thermoassociation (Tass) in the copolymer. At the same time, the pyrene fluorescence measurements demonstrated the formation of hydrophobic microdomains of P(DMA‐co‐DAAM) above Tass. The thermothickening behavior of the graft copolymers was studied by viscosity measurements, and the results suggested that in semidilute solutions, the Tass and the magnitude of thermothickening could be regulated by varying the hydrolysis degree of the backbone, the composition of side chains, and the addition of NaCl. The oscillatory shear experiments demonstrated that the copolymer can present a remarkable elasticity increase as the temerature increased to Tass. These thermoassociating copolymers with temperature‐tunable properties can have potential applications as smart materials in enhanced oil recovery. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 135, 47051.

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A new thermoresponsive polymer of poly(N-acryloylsarcosine methyl ester) with a tunable LCST

Abstract: A thermoresponsive polymer of the tertiary amide-based polyacrylamide, PNASME, was synthesized and its tunable thermoresponse was investigated.

Cited by 50 publications

References 78 publications

Thermoresponsive Polymers of Poly(2-(N-alkylacrylamide)ethyl acetate)s

Thermoresponsive Polymers of Poly(2-(N-alkylacrylamide)ethyl acetate)s

Control of Volume‐Responsive Properties of Hydrogels through Molybdenum Disulfide Nanosheet Incorporation

Thermoresponsive behavior of graft copolymers based on poly(N,N‐dimethylacrylamide‐co‐diacetoneacrylamide) side chains

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