TEMPO-oxidized cellulose nanofibril/poly(vinyl alcohol) composite drawn fibers

Endo, Ryosuke; Saito, Tsuguyuki; Isogai, Akira

doi:10.1016/j.polymer.2012.12.035

Cited by 74 publications

(58 citation statements)

References 34 publications

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“…It also exhibits low density, high aspect ratio, high surface area and, more important, it is non-toxic and biodegradable. Furthermore, by substitution of its abundant hydroxyl groups, modified NFC [31] could have increased application versatility and benefits, and different NFC nanocomposites in the form of thin films [32] , aerogels [33] and fibers [34] have been reported.…”

Section: Pedot:pss-nfc Aerogelmentioning

confidence: 99%

Thermoelectric Polymer Aerogels for Pressure–Temperature Sensing Applications

Han

Jiao

Khan

et al. 2017

Adv Funct Materials

158

117

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The evolution of our society is characterized by an increasing flow of information from things to the internet. Sensors will become the corner stone of internet-of-everything as they track various parameters in our society and sent them to the cloud for analysis, forecast or learning.With the many parameters to sense, sensors are becoming complex and difficult to manufacture.To reduce the complexity of manufacturing, one can instead create advanced functional materials that react to multiple stimuli. To this end, conducting polymer aerogels are promising materials as they combine elasticity and sensitivity to pressure and temperature and they could eventually be functionalized further with chemical and biosensing molecules. However, the challenge is to read independently pressure and temperature output signal without cross-talk of these parameters. Here, we demonstrate a strategy to fully decouple temperature and pressure reading in a dual-parameter sensor based on thermoelectric polymer aerogels. We found that aerogels made of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) can display either semiconducting or close to semimetallic properties upon exposure to high boiling point polar solvents, such as dimethylsulfoxide (DMSO). As DMSO acts as a secondary dopant, the conductivity of the PNG aerogel can be increased by more than two orders of magnitude, resulting into greatly enhanced pressure sensitivity. Importantly, because of the temperatureindependent charge transport observed for DMSO-treated PEDOT-based aerogel, a decoupled

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Section: Pedot:pss-nfc Aerogelmentioning

confidence: 99%

Thermoelectric Polymer Aerogels for Pressure–Temperature Sensing Applications

Han

Jiao

Khan

et al. 2017

Adv Funct Materials

158

117

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“…If TOCNs can be replaced by an inexpensive conventional polymer, while giving mechanical, optical, oxygen-barrier, and thermal properties similar to those of 100 % TOCNs, less expensive materials for use in various high-tech fields could be produced. Because TOCN is nanodispersible in water, it is advantageous for TOCNs to contain water-soluble polymers or water-nanodispersible nanoclays to achieve homogeneous distribution of TOCN elements in matrix polymers or inorganic nanoparticles (Henriksson et al 2008;Johnson et al 2009;Sehaqui et al 2010Sehaqui et al , 2011Liu et al 2011;Endo et al 2013;Wu et al 2012Wu et al , 2014.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of TEMPO-oxidized cellulose nanofibril film reinforcement with poly(acrylamide)

Kurihara

Isogai

2015

Cellulose

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2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (TOCNs) and poly(acrylamide) (PAM) with sodium carboxylate groups (TOCN-COONa and PAM-COONa, respectively) were converted to TOCN and PAM with protonated carboxyl groups (TOCN-COOH and PAM-COOH, respectively). Transparent and flexible PAM-COOH/TOCN-COOH, PAM-COONa/TOCN-COOH, and PAM-COOH/TOCN-COONa composite films were prepared by mixing aqueous PAM-COOH or PA M-COONa solutions and aqueous TOCN-COOH or TOCN-COONa dispersions with various PAM/TOCN weight ratios, and successive casting/drying of the mixtures. In all cases, the Young's modulus and tensile strength of the composite film were highest when the PAM content of the composite film was in the range 10-25 %. PAM therefore has the potential to reinforce TOCN films, irrespective of the sodium carboxylate groups or protonated carboxyl groups of TOCN or PAM. Although the FT-IR spectra of the PAM-COOH/TOCN-COOH composite films with various PAM/TOCN weight ratios indicated the formation of hydrogen bonds between PAM-COOH and TOCN-COOH, the formation of these hydrogen bonds could not explain the reinforcing effect achieved by PAM addition to TOCN-COOH. Because the TOCN elements form nematic-ordered or selfaligned domain structures in aqueous dispersions, PAM molecules at the corresponding PAM contents are probably present around the boundary regions of TOCN domains, and fill or cover the defects present between the TOCN domains.

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“…However, there has been recent interest in using nanocellulose in oriented PVA composites, although these efforts do little to distinguish the effect of reinforcement and alignment on the mechanical properties of the composites. For example, nanocellulose has been investigated as a reinforcement in PVA fibers that could potentially be used to reduce bulk weight and improve strength of cement, for example . Uddin et al .…”

Section: Introductionmentioning

confidence: 99%

“…produced PVA mats with up to 15% CNC by electrospinning and found that CNC increased the storage modulus. Endo et al . investigated gel‐spun PVA fibers reinforced with CNF prepared using 2,2,6,6‐tetramethylpiperidine‐1‐oxy radical (TEMPO)‐mediated oxidation as a pretreatment prior to mechanical disintegration.…”

Section: Introductionmentioning

confidence: 99%

Oriented polyvinyl alcohol films using short cellulose nanofibrils as a reinforcement

Peng

Ellingham

Sabo

et al. 2015

J of Applied Polymer Sci

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Short cellulose nanofibrils (SCNF) were investigated as a new kind of reinforcement for polyvinyl alcohol (PVA) films. SCNF were mechanically isolated from hardwood pulp after enzymatic pretreatment. Various concentrations of SCNF were added to an aqueous PVA solution, which were cast into composite films and then hot drawn with various draw ratios at 200°C. SCNF were effective in improving PVA film tensile properties (i.e., ultimate strength and elastic modulus), which depended on SCNF loading, PVA crystal orientation, and the draw ratio. For example, the ultimate strength and modulus of a composite film with a SCNF weight ratio of 3% and a draw ratio of 7.5 were nearly 46 and 61% higher than that of the neat PVA. The PVA crystal orientation increased when small amounts of SCNF were added but decreased as the SCNF content increased above about 6%, likely due to SCNF percolation resulting in network formation that inhibited alignment. Stress‐induced crystallization during hot drawing increased the crystallinity of PVA in both the PVA and its composites. Cryogenic and tensile‐fractured SEM images of PVA/SCNF composite films showed a uniform SCNF dispersion in the PVA matrix. Young's moduli of drawn composite films were predicted surprisingly well by the rule of mixtures except at intermediate levels of SCNF where the increased orientation of the matrix was not considered in the model. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42283.

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TEMPO-oxidized cellulose nanofibril/poly(vinyl alcohol) composite drawn fibers

Cited by 74 publications

References 34 publications

Thermoelectric Polymer Aerogels for Pressure–Temperature Sensing Applications

Thermoelectric Polymer Aerogels for Pressure–Temperature Sensing Applications

Mechanism of TEMPO-oxidized cellulose nanofibril film reinforcement with poly(acrylamide)

Oriented polyvinyl alcohol films using short cellulose nanofibrils as a reinforcement

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