Synthesis and functionalities of poly(N‐vinylalkylamide). V. Control of a lower critical solution temperature of poly(N‐vinylalkylamide)

Suwa, Kazuo; Morishita, Kayoko; Kishida, Akio; Akashi, Mitsuru

doi:10.1002/(sici)1099-0518(19971115)35:15<3087::aid-pola1>3.3.co;2-z

Cited by 6 publications

(5 citation statements)

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“…Thermally-responsive polymers can be classified into different groups depending on the mechanism and chemistry of the groups. These are (a) poly(N-alkyl substituted acrylamides), e.g., poly(N-isopropylacrylamide) with an LCST of 32 °C [ 29 ]; and (b) poly (N-vinylalkylamides), e.g., poly(N-vinylcaprolactam), with an LCST of about 32–35 °C according to the molecular mass of the polymer [ 30 ]. Figure 1 shows respective N-substituted polyamides according to the substitution groups.…”

Section: Stimuli-responsive Materialsmentioning

confidence: 99%

Fabrications and Applications of Stimulus-Responsive Polymer Films and Patterns on Surfaces: A Review

2014

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In the past two decades, we have witnessed significant progress in developing high performance stimuli-responsive polymeric materials. This review focuses on recent developments in the preparation and application of patterned stimuli-responsive polymers, including thermoresponsive layers, pH/ionic-responsive hydrogels, photo-responsive film, magnetically-responsive composites, electroactive composites, and solvent-responsive composites. Many important new applications for stimuli-responsive polymers lie in the field of nano- and micro-fabrication, where stimuli-responsive polymers are being established as important manipulation tools. Some techniques have been developed to selectively position organic molecules and then to obtain well-defined patterned substrates at the micrometer or submicrometer scale. Methods for patterning of stimuli-responsive hydrogels, including photolithography, electron beam lithography, scanning probe writing, and printing techniques (microcontact printing, ink-jet printing) were surveyed. We also surveyed the applications of nanostructured stimuli-responsive hydrogels, such as biotechnology (biological interfaces and purification of biomacromoles), switchable wettability, sensors (optical sensors, biosensors, chemical sensors), and actuators.

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Section: Stimuli-responsive Materialsmentioning

confidence: 99%

Fabrications and Applications of Stimulus-Responsive Polymer Films and Patterns on Surfaces: A Review

2014

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“…On the other hand, we have systematically reported that the copolymerization of NVIBA with a hydrophobic comonomer such as an N-vinyl-n-butylamide (NVB) results in lowering the LCST of the PNVIBA aqueous solutions. 13 Therefore, a slight lowering of the LCST of the macromonomers compared to that of the oligomers shows that terminal styrene residue, which is more hydrophobic than the oligomer, may cause the LCST to be low, as similarly as the case of the PNIPAAm macromonomers 1i . In fact, the LCSTs of the macromonomer discussed here exactly corresponded to those of the mixture solutions of the macromonomers and the oligomers, as described above.…”

Section: Preparation and Characterization Of Nviba Oligomers And Pnvimentioning

confidence: 99%

“…The thermosensitivity for linear PNVIBAs or PNVIBA hydrogels in an aqueous phase were actually more sensitive than those for PNIPAAms. 11,13,14 Accordingly, PNVIBA will be not only a model polymer for the purpose of studying various types of thermosensitivity but also can be substituted for PNIPAAm. In this article, we synthesized poly(styrene) nanospheres having thermosensitive PNVIBAs on their surfaces and we also characterized the changes in their thermosensitive diameter.…”

Section: Introductionmentioning

confidence: 99%

Graft copolymers having hydrophobic backbone and hydrophilic branches. XVIII. Poly(styrene) nanospheres with novel thermosensitive poly(N-vinylisobutyramide)s on their surfaces

Serizawa

Chen

Akashi

1998

J. Polym. Sci. A Polym. Chem.

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Poly(styrene) nanospheres having poly(N‐vinylisobutyramide)s (PNVIBA)s, which are structurally the same composition as well‐known thermosensitive poly(N‐isopropylacrylamide)s (PNIPAAm)s and show the thermosensitive property as well, on their surfaces were synthesized by the free radical polymerization of hydrophilic PNVIBA macromonomers and hydrophobic styrene with AIBN as a radical initiator in ethanol as a polar solvent and were characterized in regard to their thermosensitive properties. Both the NVIBA oligomers and PNVIBA macromonomers that we synthesized showed a lower critical solution temperature (LCST) at around 40°C, as was predicted by our previous research. The nanospheres were spherical in form and have a narrow size distribution. Their sizes could be controlled by varying the molecular weight of the macromonomers and the amount of it in feed. The size in the nanosphere became small above the LCST of the corresponding macromonomer, possibly due to thermosensitive shrinking of the PNVIBA on the nanosphere surface, while transmittance of its dispersion did not change at all at studied temperature range. The nanospheres having the PNVIBA on their surfaces, which response sharply to atmospheres such as dispersion temperature, can be significant and useful materials in technological and medical fields. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2581–2587, 1998

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“…[23,24] It is known that the thermal-responsive behavior of a polymer in aqueous solution is related to the balance of two or more opposite forces between either the polymers with each other or with the solvent via hydrogen bonding or the hydrophobic interaction, therefore thermal responsibility can be introduced into a hydrophilic polymer like PVAm by copolymerization with a more hydrophobic monomer. [14,22,[25][26][27][28][29] The pendant amine groups of PVAm, in addition to acting as the functional groups for CO 2 capture, are convenient for such a hydrophobic chemical modification. Analogously to the DMAPM-functionalized PNIPAm-based thermal-responsive GPs, modified PVAmbased copolymers with phase transition behaviors are expected to show high CO 2 release efficiency in a low regeneration temperature (75 °C).…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydrophobic Modifications and Phase Transitions of Polyvinylamine Hydrogel Films on Reversible CO₂ Capture Behavior: Comparison between Copolymer Films and Blend Films for Temperature‐Responsive CO₂ Absorption

Yue

Imai

Yamashita

et al. 2017

Macro Chemistry & Physics

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The separation of CO2 from large emission sources is essential to both mitigate the greenhouse effect, as well as generate carbon‐based energy. However, energy consumption of conventional CO2 separation processes, which using aqueous amine solution as absorbent, is too large. It is has been previously reported that hydrogel films that are consisting of temperature‐responsive amine‐containing polymers can be energy efficient CO2 absorbent—the films can reversibly capture and release large amount of CO2 via temperature‐induced phase transition of hydrogels. However, the study is limited to the films consisting of gel particles of polyacrylamides. In this study, a series of hydrogel films consisting of a mass‐produced amine‐containing linear polymer, polyvinyl amine (PVAm), are prepared, and the efficiencies of their reversible CO2 capture are tested. The effects of hydrophobic modifications and the temperature dependent phase transition behaviors of the films on the reversible CO2 capture efficiency are studied in detail. The function of hydrogel films containing modified PVAm (copolymers), as well as blend films of nonmodified PVAm and 100% modified PVAm, are compared for the first time. The results reveal that the reversible CO2 capture efficiency of polyamine films can be improved just by blending with temperature‐responsive polymers.

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Synthesis and functionalities of poly(N‐vinylalkylamide). V. Control of a lower critical solution temperature of poly(N‐vinylalkylamide)

Cited by 6 publications

References 0 publications

Fabrications and Applications of Stimulus-Responsive Polymer Films and Patterns on Surfaces: A Review

Fabrications and Applications of Stimulus-Responsive Polymer Films and Patterns on Surfaces: A Review

Graft copolymers having hydrophobic backbone and hydrophilic branches. XVIII. Poly(styrene) nanospheres with novel thermosensitive poly(N-vinylisobutyramide)s on their surfaces

Effects of Hydrophobic Modifications and Phase Transitions of Polyvinylamine Hydrogel Films on Reversible CO₂ Capture Behavior: Comparison between Copolymer Films and Blend Films for Temperature‐Responsive CO₂ Absorption

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Synthesis and functionalities of poly(N‐vinylalkylamide). V. Control of a lower critical solution temperature of poly(N‐vinylalkylamide)

Cited by 6 publications

References 0 publications

Fabrications and Applications of Stimulus-Responsive Polymer Films and Patterns on Surfaces: A Review

Fabrications and Applications of Stimulus-Responsive Polymer Films and Patterns on Surfaces: A Review

Graft copolymers having hydrophobic backbone and hydrophilic branches. XVIII. Poly(styrene) nanospheres with novel thermosensitive poly(N-vinylisobutyramide)s on their surfaces

Effects of Hydrophobic Modifications and Phase Transitions of Polyvinylamine Hydrogel Films on Reversible CO2 Capture Behavior: Comparison between Copolymer Films and Blend Films for Temperature‐Responsive CO2 Absorption

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Effects of Hydrophobic Modifications and Phase Transitions of Polyvinylamine Hydrogel Films on Reversible CO₂ Capture Behavior: Comparison between Copolymer Films and Blend Films for Temperature‐Responsive CO₂ Absorption