Thermo-responsive nanofibers prepared from poly(N-isopropylacrylamide-co-N-methylol acrylamide)

Chuang, Wen-Ju; Chiu, Wen‐Yen

doi:10.1016/j.polymer.2012.05.014

Cited by 23 publications

(25 citation statements)

References 18 publications

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“…Recently, we reported the ES nanofibers prepared from triblock polyfluorene ‐block‐ poly( N ‐isopropylacrylamide) ‐block‐ poly(N‐methylolacrylamide) (PF ‐b‐ PNIPAAm ‐b‐ PNMA) with a fluorescent probe (PF), hydrophilic thermoresponsive material (PNIPAAm) and a chemically crosslinkable moiety (PNMA). It showed good wettability and integrity in aqueous solution after PNMA crosslinking, and their photoluminescence spectral characteristics exhibited reversible transition at different temperatures . Although DAQ has been reported to be a good colormetric sensor for sensing NO (g) , the thermoresponsive ES nanofibers containing DAQ gas sensing moiety have not been explored yet, as far as we know.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Electrospun Nanofibers Prepared from Poly((N‐isopropylacrylamide)‐co‐(N‐hydroxymethylacrylamide)) and Their Blends with 1,2‐Diaminoanthraquinone for NO Gas Detection

Chen

Chiu

Hung

et al. 2013

Macro Chemistry & Physics

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Multifunctional electrospun (ES) nanofibers are successfully prepared from blends of poly((N‐isopropylacrylamide)‐co‐(N‐hydroxymethylacrylamide)) (poly(NIPAAm‐co‐NMA)) with NO(g)‐responsive 1,2‐diaminoanthraquinone (DAQ). Different compositions of poly(NIPAAm‐co‐NMA) are synthesized by free radical polymerization. The NMA content significantly affects the stability of the ES nanofibers in water and the NO(g) detection due to a change of the hydrophilic/hydrophobic characteristics. In addition, the fibers exhibit a significant volume (or hydrophilic/hydrophobic) change during the heating and cooling cycle between 25 and 50 °C, attributed to the lower critical solution temperature (LCST) characteristic of the thermoresponsive NIPAAm moiety. On the other hand, a distinct on/off switching of the optical absorption spectra and high color contrast on detecting the NO(g) are observed using the ES nanofibers of poly(NIPAAm‐co‐NMA)/DAQ blends. The high surface/volume of ES fibers enhance the sensitivity and responsive speed, compared with that of drop‐cast film. The above studies suggest that the prepared multifunctional ES nanofibers have potential applications in environmentally sensing devices.

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Section: Introductionmentioning

confidence: 99%

Multifunctional Electrospun Nanofibers Prepared from Poly((N‐isopropylacrylamide)‐co‐(N‐hydroxymethylacrylamide)) and Their Blends with 1,2‐Diaminoanthraquinone for NO Gas Detection

Chen

Chiu

Hung

et al. 2013

Macro Chemistry & Physics

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“…It can be seen that all the fiber mats had high gel fractions above 80%, in agreement with our previous result. 25 This indicates most of the sheath layer was being cross-linked.…”

Section: Gel Fraction and Swelling Ratiomentioning

confidence: 99%

“…25 [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.] (2) where W c and W sh are the weights of core (PBS) and sheath (PDPNN) in the core-sheath fibers, respectively.…”

Section: Gel Fraction and Swelling Ratiomentioning

confidence: 99%

“…The reported values of molecular weight were based on the polystyrene standards. 25 The Viscosities of the Spinning Solutions The viscosities of the PBS/chloroform (20 wt %) and the PDPNN/water (6.0 wt %) as the spinning solutions for preparing core-sheath fibers were measured at 25 8C using a rheometer (AR2000ex system, TA Instruments, USA). The viscosities were recorded at various shear rates from 1 to 1000 s 21 .…”

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Preparation and properties of thermoresponsive and conductive composite fibers with core‐sheath structure

Lin

Don

Chang

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

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In this research, thermoresponsive and conductive fibers with core-sheath structure were fabricated by coaxial electrospinning. For preparing the spinning sheath solution, poly-(N-isopropylacrylamide-co-N-methylolacrylamide) (PNN) copolymer having thermoresponsive and cross-linkable properties was synthesized by free-radical polymerization using redox initiators; it was then mixed with the conductive poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) at different weight ratios in water. On the other hand, poly(butyl acrylate-co-styrene) (PBS) copolymer synthesized by emulsion polymerization was dissolved in chloroform and used as the spinning core solution. After electrospinning, the fibers were treated at 110 8C for 1 h to cross-link the PNN portion in the sheath for strengthening the fibers. Well-defined core-sheath fibers were observed from SEM pictures; the outside and inside (core) diameters were 568 6 24 and 290 6 40 nm, respectively, as determined from TEM pictures. The fiber mats were further doped by DMSO to enhance their conductivity. For the fiber mat with the weight ratio of PEDOT:PSS/PNN at 0.20 in the sheath, its surface conductivity could reach 29.4 S/ cm. In addition, the fiber mats exhibited thermoresponsive properties that both swelling ratio and electric resistance decreased with temperature. Furthermore, the fiber mats exhibited improved flexibility as evaluated via bending test.

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“…11 Poly(N-isopropylacrylamide) (PNIPAm), as a typical thermoresponsive polymer, has been studied extensively in the last decades for potential applications in sensing and drug delivering. copolymerization with other monomers and non-covalently mixing with waterinsoluble polymers, [20][21][22] to stabilize PNIPAm nanobers. 18,19 The response of volume and electrical resistance to the temperature is even more pronounced when the polymer is in the form of nanobers.…”

Section: Introductionmentioning

confidence: 99%

Thermally responsive behaviour of the electrical resistance of electrospun P(NIPAm-co-NMA)/Ag composite nanofibers

Zhang

Deng

et al. 2015

RSC Adv.

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Thermally responsive copolymer P(NIPAm-co-NMA) was prepared via a radical copolymerization and spun into nanofibers using electrospinning. After thermal crosslinking, the electrospun fibers were modified using KH590 and silver nanoparticles were introduced onto the fiber surface using a chemical plating method.The electrical resistance of the composite fibers containing 65.5% of silver at different temperatures was investigated and it was found that the resistance dropped by $60% as the temperature increased from 42 C to 46 C, which is consistent with the solubility transition of PNIPAm with the change of temperature as revealed by differential scanning calorimetry (DSC) measurement.

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Thermo-responsive nanofibers prepared from poly(N-isopropylacrylamide-co-N-methylol acrylamide)

Cited by 23 publications

References 18 publications

Multifunctional Electrospun Nanofibers Prepared from Poly((N‐isopropylacrylamide)‐co‐(N‐hydroxymethylacrylamide)) and Their Blends with 1,2‐Diaminoanthraquinone for NO Gas Detection

Multifunctional Electrospun Nanofibers Prepared from Poly((N‐isopropylacrylamide)‐co‐(N‐hydroxymethylacrylamide)) and Their Blends with 1,2‐Diaminoanthraquinone for NO Gas Detection

Preparation and properties of thermoresponsive and conductive composite fibers with core‐sheath structure

Thermally responsive behaviour of the electrical resistance of electrospun P(NIPAm-co-NMA)/Ag composite nanofibers

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