Radiation synthesis and environmental responsiveness of semi‐interpenetrating polymer networks composed of poly(dimethyl–aminoethyl methacrylate) and poly(ethylene oxide)

Liu, Zhugen; Zhai, Maolin; Hongfei, Ha; Luo, Zhigang; Xiang, Xueqing

doi:10.1002/app.20319

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…Plenty of research studies have been concerned with the synthesis and characterization of PDMAEMA‐based gels and their applications as controlled release systems and water treatment 15–17. In our previous study, PDMAEMA‐based hydrogels were synthesized by γ or UV radiation 18–25. The PDMAEMA hydrogel was found to have a lower critical swelling temperature from 40 to 50°C, depending on the synthesis conditions.…”

Section: Introductionmentioning

confidence: 99%

Overshooting effect of poly(dimethylaminoethyl methacrylate) hydrogels

Zhai

et al. 2010

J of Applied Polymer Sci

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An overshooting effect was observed during the swelling procedure of poly(dimethylaminoethyl methacrylate) (PDMAEMA) gel for the first time. The effects of the temperature, ionic strength, and pH on the overshooting effect of the PDMAEMA gel were investigated. We found that the overshooting effect of the gel could not be eliminated by changing the temperature; however, the overshooting effect was indiscernible in high-concentration NaCl solutions (>0.2 mol/L) and basic (pH 11.9) and acidic solutions (pH ¼ 2.1). The overshooting effect of the PDMAEMA gel was attributed to the dynamic conformational changes of the side chains of dimethylaminoethyl methacrylate (DMAEMA) units during the swelling of the gels. In the presence of NaCl or NaOH, the stretching of the macromolecular chains of the gels was disrupted. While in acidic solution, the protonation of tertiary amino groups in the DMAEMA units made the side chains of the DMAEMA units change from the cyclic conformation to the stretched one; this was analyzed with the aid of Fourier transform infrared spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Overshooting effect of poly(dimethylaminoethyl methacrylate) hydrogels

Zhai

et al. 2010

J of Applied Polymer Sci

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“…g-Radiation has previously been applied to initiate polymerization reactions, to graft polymer chains onto polymeric backbones, to modify polymer blends, to cross-link polymers, and to prepare interpenetrating polymer networks. [16][17][18][19] Another application, which is also intensively studied, is the generation of smart polymer hydrogels. [20,21] However, g-radiation can initiate most vinylic monomers, such as acrylates, methacrylates, and styrenics.…”

Section: Introductionmentioning

confidence: 99%

RAFT Polymerization of N‐Isopropylacrylamide and Acrylic Acid under γ‐Irradiation in Aqueous Media

Millard

Barner

Stenzel

et al. 2006

Macromol. Rapid Commun.

100

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Summary: The ambient temperature (20 °C) reversible addition fragmentation chain transfer (RAFT) polymerization of N‐isopropylacrylamide (NIPAAm) and acrylic acid (AA) conducted directly in aqueous media under γ‐initiation (at dose rates of 30 Gy · h−1) proceeds in a controlled fashion (typically, $\overline M _{\rm w} /\overline M _{\rm n}$ < 1.2) to near quantitative conversions and up to number‐average molecular weights of 2.5 × 105 g · mol−1 for PNIPAAm and 1.1 × 105 g · mol−1 for PAA via two water‐soluble trithiocarbonate chain transfer agents, i.e., S,S‐bis(α,α′‐dimethyl‐α″‐acetic acid)trithiocarbonate (TRITT) and 3‐benzylsulfanylthiocarbonylsulfanyl propionic acid (BPATT). The generated polymers are successfully chain extended, which suggests that the RAFT agents are stable throughout the polymerization process so that complex and well‐defined architectures can be obtained.An increase of the monomer/CTA ratio leads to an increase of the molecular weight for the RAFT polymerization of NIPAAm under γ‐radiation in water using TRITT at ambient temperature.imageAn increase of the monomer/CTA ratio leads to an increase of the molecular weight for the RAFT polymerization of NIPAAm under γ‐radiation in water using TRITT at ambient temperature.

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“…In this study, we prepared hydrophilic core–shell particles by initiating the graft polymerization of 2‐(dimethylamino)ethyl methacrylate (DMAEMA) from the surfaces of polymer particles by oxyanionic polymerization. The charge properties of the poly[2‐(dimethylamino)ethyl methacrylate] (PDMAEMA) grafting shell were tunable by pH 33–35. With changes in the pH value, the negatively charged modified magnetic fluid could be easily adsorbed onto or desorbed from the core–shell particles.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of core–shell polymer particles with protonizable shells prepared by oxyanionic polymerization

Jin

Deng

et al. 2004

J. Polym. Sci. A Polym. Chem.

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A series of polystyrene (PS)/poly(vinyl acetate) (PVAc) crosslinked particles (240, 210, or 90 nm) with different concentrations of PS (75, 50, or 25 wt %) were prepared by soap-free emulsion polymerization. Based on the crosslinked polymer particles, three series of monodisperse core-shell particles with pH-sensitive poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) shells were synthesized by oxyanionic polymerization. During the oxyanionic polymerization, the acetate groups of PVAc were hydrolyzed, and the hydroxyl groups that formed on the surfaces of the particles, acting as initiators, were transferred to OO Ϫ K ϩ by DMSO Ϫ K ϩ (where DMSO is dimethyl sulfoxide) at the same time; then, OO Ϫ K ϩ initiated the polymerization of 2-(dimethylamino)ethyl methacrylate. 1 H NMR and Fourier transform infrared studies confirmed the existence of PDMAEMA shells, and the contents of PDMAEMA were measured by elemental analysis. Because the PDMAEMA chain could be protonated at a low pH, these core-shell particles could adsorb negatively charged modified magnetite particles, and at higher pHs, the magnetite particles could be released again; this process was reversible.

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Radiation synthesis and environmental responsiveness of semi‐interpenetrating polymer networks composed of poly(dimethyl–aminoethyl methacrylate) and poly(ethylene oxide)

Cited by 7 publications

References 14 publications

Overshooting effect of poly(dimethylaminoethyl methacrylate) hydrogels

Overshooting effect of poly(dimethylaminoethyl methacrylate) hydrogels

RAFT Polymerization of N‐Isopropylacrylamide and Acrylic Acid under γ‐Irradiation in Aqueous Media

Preparation and characterization of core–shell polymer particles with protonizable shells prepared by oxyanionic polymerization

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