Study of the temperature-induced aggregation of polyoxometalate-poly(N,N-diethylacrylamide) hybrids in water

Haye, Jennifer Lesage de la; Costa, André Pontes da; Pembouong, Gaëlle; Hasenknopf, Bernold; Lacôte, Emmanuel; Rieger, Jutta

doi:10.1016/j.polymer.2014.12.013

Cited by 13 publications

(12 citation statements)

References 60 publications

(53 reference statements)

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“…Therefore, the aggregation of charged copolymer chains was much easier than that of homopolymer. The same results were noted in the study by Hayde et al [35] and Andre et al [36]. On the other hand, as the temperature increased from 25 to 45 • C, the D H of polymer and copolymer decreased dramatically because the coil-to-globule transition behavior occurred revealing a typical thermally induced aggregation [37].…”

Section: Dynamic Light Scattering (Dls) and Gel Permeation Chromatography (Gpc)supporting

confidence: 83%

Synthesis and Properties of pH-Thermo Dual Responsive Semi-IPN Hydrogels Based on N,N’-Diethylacrylamide and Itaconamic Acid

Tuan

Nhu

2020

Polymers

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A series of semi-interpenetrating polymer network (semi-IPN) hydrogels based on N,N’-diethylacrylamide (DEA) and itaconamic acid (IAM) were synthesized by changing the molar ratio of linear copolymer P(DEA-co-IAM) and DEA monomer. Linear copolymer P(DEA-co-IAM) was introduced into a solution of DEA monomer to prepare pH-thermo dual responsive P(DEA-co-IAM)/PDEA semi-IPN hydrogels. The thermal gravimetric analysis (TGA) revealed that the semi-IPN hydrogel has a higher thermal stability than the conventional hydrogel, while the interior morphology by scanning electron microscopy (SEM) showed a porous structure with the pore sizes could be controlled by changing the ratio of linear copolymer in the obtained hydrogels. The oscillatory parallel-plate rheological measurements and compression tests demonstrated a viscoelastic behavior and superior mechanical properties of the semi-IPN hydrogels. Besides, the lower critical solution temperature (LCST) of the linear copolymers increased with the increase of IAM content in the feed, while the semi-IPN hydrogels increased LCSTs with the increase of linear copolymer content introduced. The pH-thermo dual responsive of the hydrogels was investigated using the swelling behavior in various pH and temperature conditions. Finally, the swelling and deswelling rate of the hydrogels were also studied. The results indicated that the pH-thermo dual responsive semi-IPN hydrogels were synthesized successfully and may be a potential material for biomedical, drug delivery or absorption applications. The further applications of semi-IPN hydrogels are being conducted.

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Section: Dynamic Light Scattering (Dls) and Gel Permeation Chromatography (Gpc)supporting

confidence: 83%

Synthesis and Properties of pH-Thermo Dual Responsive Semi-IPN Hydrogels Based on N,N’-Diethylacrylamide and Itaconamic Acid

Tuan

Nhu

2020

Polymers

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“…The DSC analysis was conducted to investigate the LCST of PNIPAAm and the hybrids. LCST is determined as the onset temperature of the endothermic peak . The thermograms are shown in Supporting Information Figure S1.…”

Section: Resultsmentioning

confidence: 99%

“…LCST is determined as the onset temperature of the endothermic peak. 24 The thermograms are shown in Supporting Information Figure S1. LCSTs of NI100 and NI400 are 37.46 and 32.798C, respectively, while they reduce to 33.898C in CSNI100 and 31.298C in CSNI400.…”

Section: Resultsmentioning

confidence: 99%

Poly(N‐isopropylacrylamide) hydrogel/chitosan scaffold hybrid for three‐dimensional stem cell culture and cartilage tissue engineering

Mellati

Kiamahalleh

Madani

et al. 2016

J Biomedical Materials Res

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Providing a controllable and definable three-dimensional (3D) microenvironment for chondrogenic differentiation of mesenchymal stem cells (MSCs) remains a great challenge for cartilage tissue engineering. In this work, poly(N-isopropylacrylamide) (PNIPAAm) polymers with the degrees of polymerization of 100 and 400 (NI100 and NI400) were prepared and the polymer solutions were introduced into the preprepared chitosan porous scaffolds (CS) to form hybrids (CSNI100 and CSNI400, respectively). SEM images indicated that the PNIPAAm gel partially occupied chitosan pores while the interconnected porous structure of chitosan was preserved. MSCs were incorporated within the hybrid and cell proliferation and chondrogenic differentiation were monitored. After 7-day incubation of the cell-laden constructs in a growth medium, the cell viability in CSNI100 and CSNI400 were 54 and 108% higher than that in CS alone, respectively. Glycosaminoglycan and total collagen contents increased 2.6- and 2.5-fold after 28-day culture of cell-laden CSNI400 in the chondrogenic medium. These results suggest that the hybrid structure composed of the chitosan porous scaffold and the well-defined PNIPAAm hydrogel, in particular CSNI400, is suitable for 3D stem cell culture and cartilage tissue engineering. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 104A: 2764-2774, 2016.

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“…We studied in more depth the behavior of the POM-PDEAAm hybrids in water. [1,8] The POM-PDEAAm hybrids at 20 °C contain unimers and microgeltype swollen aggregates. Heating led to phase transition caused by the cleavage of hydrogen bonds.…”

Section: Organotin-substituted Dawson Hybridsmentioning

confidence: 99%

Polymer-containing Organo-Polyoxometalate: Towards New Catalytic Object

Lacôte

2016

Chimia

Self Cite

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Polyoxometalates (POMs) are early transition metal oxide clusters, which form a diverse family of compounds with highly tunable shapes, sizes, charges, etc. Generating hybrid structures is an attractive path to increase the structural diversity of POMs. The present article is a personal account that retraces how we inserted polyoxometallic platforms onto polymeric chains. We focused on two main families of functionalized organo-POMs: the organotin-substituted Dawson polyoxotunstates α1 and α2-[P(2)W(17)O(61)(SnR)](7-) and the Dawson vanadotungstates [P(2)V(3)W(15)O(59){(OCH(2))(2)-C(Et)NHC(=O)R}](5-). Herein we discuss how the connection of POMs to polymers affects the self-assembly of the polymers and the catalytic properties of the polyoxometalates.

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Study of the temperature-induced aggregation of polyoxometalate-poly(N,N-diethylacrylamide) hybrids in water

Cited by 13 publications

References 60 publications

Synthesis and Properties of pH-Thermo Dual Responsive Semi-IPN Hydrogels Based on N,N’-Diethylacrylamide and Itaconamic Acid

Synthesis and Properties of pH-Thermo Dual Responsive Semi-IPN Hydrogels Based on N,N’-Diethylacrylamide and Itaconamic Acid

Poly(N‐isopropylacrylamide) hydrogel/chitosan scaffold hybrid for three‐dimensional stem cell culture and cartilage tissue engineering

Polymer-containing Organo-Polyoxometalate: Towards New Catalytic Object

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