The effect of salt and pH on the phase transition behaviors of pH and temperature-responsive poly(N,N-diethylacrylamide-co-methylacrylic acid)

Liu, Tong Huan; Fang, Jian; Zhang, Ya Ping; Zeng, Zheng

doi:10.1007/bf03218579

Cited by 17 publications

(13 citation statements)

References 31 publications

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“…The copolymerization of styrene and maleic anhydride has long been regarded as a classical example of an alternating radical copolymer system. [31][32][33][34] The alternating tendency in copolymerization has been explained by the participation of a 1:1 charge-transfer complex of styrene and maleic anhydride in the propagation step. 35,36 This is due to the fact that maleic anhydride does not homopolymerize under normal conditions and styrene forms a donor-acceptor complex with anhydride.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of fluorinated polymer gate dielectric with improved wetting property and its application to organic field-effect transistors

Kim

Jung

et al. 2009

Macromol. Res.

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We report the fabrication of pentacene organic field-effect transistors (OFETs) using a fluorinated styrene-alt-maleic anhydride copolymer gate dielectric, which was prepared from styrene derivatives with a fluorinated side chain [-CH] and maleic anhydride through a solution polymerization technique. The fluorinated side chain was used to impart hydrophobicity to the surface of the gate dielectric and maleic anhydride was employed to improve its wetting properties. A field-effect mobility of 0.12 cm 2 /Vs was obtained from the as-prepared top-contact pentacene FETs. Since various functional groups can be introduced into the copolymer due to the nature of maleic anhydride, its physical properties can be manipulated easily. Using this type of copolymer, the performance of organic FETs can be enhanced through optimization of the interfacial properties between the gate dielectric and organic semiconductor.

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Section: Resultsmentioning

confidence: 99%

Synthesis of fluorinated polymer gate dielectric with improved wetting property and its application to organic field-effect transistors

Kim

Jung

et al. 2009

Macromol. Res.

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“…Moreover, the polymer containing 12%MAA showed no LCST in the range of 10–70 °C as a result of the very high hydrophilicity caused by the deprotonation of methacrylic acid at pH7 and the resulting strong formation of hydrogen bonds with water. In addition, the electrostatic repulsion among the ionized carboxylic acid groups could have stopped the polymer chains from aggregation …”

Section: Resultsmentioning

confidence: 99%

“…In contrast, all the synthesized block copolymer micelles precipitated when the pH level was adjusted to 5. Although the PDEGMA homopolymer should not respond to pH changes, it was reported that high salt concentrations can decrease the strength of the hydrogen bonding between water molecules and hydrophilic chains . This contributes to a lower solubility and a higher tendency to self‐aggregate when the temperature increases.…”

Section: Resultsmentioning

confidence: 99%

Dual-Responsive pH and Temperature Sensitive Nanoparticles Based on Methacrylic Acid and Di(ethylene glycol) Methyl Ether Methacrylate for the Triggered Release of Drugs

et al. 2015

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A series of thermo-and pH-responsive poly(methyl methacrylate)-block-poly[methacrylic acid-co-di(ethylene glycol) methyl ether methacrylate] PMMA-b-P[MAA-co-DEGMA] block copolymers were synthesized by RAFT polymerization and self-assembled into micelles. The molar ratio of MAA was altered from 0-12% in order to modulate the lower critical solution temperature (LCST) of PDEGMA. The release of the drug albendazole from the micelle was strongly dependent on the temperature and the LCST value of the polymer. Systems below the LCST released the drug slowly while increasing the temperature above the LCST or decreasing the pH value to 5 resulted in the burst-like release of the drug. ABZ delivered in this pH-responsive drug carrier had a higher toxicity than the free drug or the drug delivered in a non-responsive drug carrier.

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“…The signal at approximately 34 ppm was attributed to the methylene carbon in NHC=OCH 2 groups [17]. Peaks between 9 -22 ppm can be attributed to CH 3 groups from side chains present in the polymer [20]. Signals at 19 and 27 ppm are most likely due to CH 2 -CH 2 type carbons.…”

Section: Nmr Analysismentioning

confidence: 99%

Catalytic conversion of glycerol to polymers in the presence of ammonia

Sánchez

Gaikwad

Holdsworth

et al. 2016

Chemical Engineering Journal

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In this contribution, the development of a process for the synthesis of potentially highly valuable polymeric products from the reaction of waste glycerol with ammonia is reported for the first time. The polymers were the result of a single step, continuous gas phase process, catalysed by an alumina-supported iron catalyst, operating under relatively mild reaction conditions. The solid product was characterised using 1D and 2D NMR spectroscopy, FTIR spectroscopy, qualitative chemical tests and elemental analysis. Characterisation revealed building blocks with unsaturated, amido and ester functionalities shaping a mixture of polymers. Nitrogen atoms were present in the main chain of the resultant polymers. NMR analyses of the polymer denotes the formation of structural defects such as unsaturation and branching; while the partial solubility of the polymer in solvents such as CDCl 3 and THF is indicative of the formation of cross-linked structures. Insights into the mechanism of formation of these functional groups were based on the liquid and gas phase product distribution. Polymers with chain structures similar to those synthesised in this work are currently manufactured from fossil fuels and are widely used in biomedical applications not 2 only because of their architecture but also due to their response to changes in pH and temperature.

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The effect of salt and pH on the phase transition behaviors of pH and temperature-responsive poly(N,N-diethylacrylamide-co-methylacrylic acid)

Cited by 17 publications

References 31 publications

Synthesis of fluorinated polymer gate dielectric with improved wetting property and its application to organic field-effect transistors

Synthesis of fluorinated polymer gate dielectric with improved wetting property and its application to organic field-effect transistors

Dual-Responsive pH and Temperature Sensitive Nanoparticles Based on Methacrylic Acid and Di(ethylene glycol) Methyl Ether Methacrylate for the Triggered Release of Drugs

Catalytic conversion of glycerol to polymers in the presence of ammonia

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