Polyaniline Cryogels Supported with Poly(vinyl alcohol): Soft and Conducting

Stejskal, Jaroslav; Bober, Patrycja; Trchová, Miroslava; Kovalcik, Adriána; Hodan, Jiří; Hromádková, Jiřina; Prokeš, Ján

doi:10.1021/acs.macromol.6b02526

Cited by 64 publications

(51 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a kind of biodegradable and eco‐friendly materials, water‐soluble poly (vinyl alcohol) (PVA) has been widely used in various industrial applications, such as biodegradable materials, chemical engineering, and so on . The most important parameters influencing the physical properties of PVA are the molecular weight and alcoholysis degree .…”

Section: Introductionmentioning

confidence: 99%

Improved mechanical properties of poly (vinyl alcohol) films with glycerol plasticizer by uniaxial drawing

Tian

Zhou

et al. 2018

Polymers for Advanced Techs

View full text Add to dashboard Cite

In this work, the uniaxial stretching poly (vinyl alcohol) (PVA) films with glycerol as plasticizer were prepared to explore the influence of drawing temperature and drawing ratio. The structure and property were investigated with scanning electron microscope, wide-angle X-ray diffraction, X-ray diffraction, differential scanning calorimetry, mechanical tests, etc. With the increase of stretching temperature, the melting and crystallization temperatures increased. The tensile strength and Young modulus of glycerol/PVA films increased first and then decreased; when the temperature was 80°C, the tensile strength and Young modulus reached to maximum values of 197.2 and 470 MPa, respectively. In addition, with the increase of draw ratio, the orientation degree of the PVA molecular chains increased, indicating the improved regularity of molecular chains. When the PVA films were stretched to 4 times, the tensile strength and Young modulus of the films reached 162 and 143 MPa, respectively, which were 4 and 1.3 times compared with those of unoriented films. These environmentally friendly PVA films with excellent mechanical properties would find wide applications in the industry such as packaging, coating, etc. KEYWORDS glycerol, orientation, poly (vinyl alcohol), uniaxial stretching 1 | INTRODUCTION As a kind of biodegradable and eco-friendly materials, water-soluble poly (vinyl alcohol) (PVA) has been widely used in various industrial applications, such as biodegradable materials, chemical engineering, and so on. 1-4 The most important parameters influencing the physical properties of PVA are the molecular weight and alcoholysis degree. 5-7Due to the alcoholysis degree, PVA could be divided into 3 kinds with high (98%-100%), medium (87%-89%), and low alcoholysis degree (78%). 8 Poly (vinyl alcohol) with medium alcoholysis degree could dissolve in both hot and cold water, while PVA with alcoholysis degree more than 99% could only dissolve in hot water with temperature higher than 95°C. Compared with PVA with low alcoholysis degree, high alcoholysis PVA possesses higher water resistance, mechanical properties, as well as oxygen barrier properties, therefore exhibiting wider applications. 3,9 Stretching is mainly divided into uniaxial stretching and biaxial stretching, and it is well known that after stretching of films above its glass transition temperature (T g ), the molecular chain or molecular chain segments will rearrange toward the direction of external force. 10-12 For semicrystalline polymers, 13 stretching is an effective method to obtain oriented films with excellent mechanical, optical, and thermal properties, 14,15 which has been carried out at large-scale production for nearly 80 years. 16 These end-use properties are essentially controlled by stretching-induced crystallization of the polymer, which is affected by the stretching mode and processing conditions, such as temperature, stretching rate, and draw ratio (DR). 17,18 The processing conditions have strong impact on the morphology, crystalline structure...

show abstract

Section: Introductionmentioning

confidence: 99%

Improved mechanical properties of poly (vinyl alcohol) films with glycerol plasticizer by uniaxial drawing

Tian

Zhou

et al. 2018

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…Until now,v arious strategies have been developed to fabricate conductive hydrogel for flexible electronic devices,i ncluding co-networks,b lends and self-assembly. [50][51][52][53][54][55][56][57][58] These strategies provide ab road perspective on designing and fabricating nanocomposite conductive hydrogels. We further divide theses trategies into several approaches:( i) electro or chemicalp olymerization of ac onducting monomer in ap refabricatedh ydrogel, (ii)mixing the conductive materials/monomers and hydrophilicp olymers/monomers followed by simultaneous or step-wise cross-linking to produce conductive hydrogels, and (iii)self-assembling the modified electrical conductive materials.…”

Section: Fabricationo Fc Onductive Hydrogelsmentioning

confidence: 99%

Conductive Hydrogels as Smart Materials for Flexible Electronic Devices

Rong

Lei

Liu

2018

Chemistry A European J

266

184

View full text Add to dashboard Cite

Flexible conductive materials have gained considerable research interest in recent years because of their potential applications in flexible energy storage devices, sensors, touch panels, electronic skins, etc. With excellent flexibility, outstanding electric properties and tunable mechanical properties, conductive hydrogels as conductive materials offer plentiful insights and opportunities for flexible electronic devices. Numerous synthetic strategies have been developed to obtain various conductive hydrogels, and high-performance flexible electronic devices based on these conductive hydrogels have been realized. This review provides a comprehensive overview of conductive-hydrogel-based flexible electronics, ranging from conductive hydrogels synthesis to several important flexible devices applications, including touch panels, sensors and energy storage. Finally, we provide new future research directions and perspectives for conductive-hydrogel-based flexible and portable electronic devices.

show abstract

“…Great efforts have been made to improve the performance and durability of the materials used as electrodes and electrolyte of such devices. As low‐cost and flexible materials, conducting polymer (particularly polyaniline, PANI) based composite gels have received great attention to be used as the electrode material in supercapacitors . Li et al.…”

Section: Introductionmentioning

confidence: 99%

“…As low-cost and flexible materials, conducting polymer (particularly polyaniline, PANI) based composite gels have received great attention to be used as the electrode material in supercapacitors. [7][8][9][10][11][12][13][14][15][16][17] Li et al have reported the supramolecular assembly of polyvinyl alcohol (PVA) and PANI for fabrication of flexible supercapacitors with 13.6 Whkg À 1 energy density. [9] In another work, graphene oxide was mixed with a composite gel to make supercapacitor electrodes with the specific capacitance of 438.8 Fg À 1 .…”

Section: Introductionmentioning

confidence: 99%

A Polyaniline‐Based Redox‐Active Composite Gel Electrolyte with Photo‐Electric and Electrochromic Properties

et al. 2019

View full text Add to dashboard Cite

A polyaniline (PANI)‐based gel material with a redox‐active nature has demonstrated unique charge storage, photovoltaic, and electrochromic properties in the bulk of the gel. The specific capacitance in the volume of the gel was measured to be 428.9 mF g−1. Also, a hybrid device for concurrent solar energy harvesting and charge storage was made simply by placing a layer of the gel between a TiO2 coated electrode and a carbon electrode. The hybrid device showed 137 mV open circuit voltage under the light condition with only 10 mV voltage drop in 600 s after cessation of light. The electrochromic property of the composite gel was also studied in a device made of two transparent electrodes. The results showed 64 % transmittance at 564 nm and zero transmittance when the cell was biased at 0.0 V and 2.0 V, respectively. The photoelectric property and the redox‐active nature of the gel suggest existence of both ionic and electronic conductions through the electrolytes. The results are encouraging to further customize the composite gel for various applications, including supercapacitors, solar cells, photoactive supercapacitors, and electrochromic windows.

show abstract

Polyaniline Cryogels Supported with Poly(vinyl alcohol): Soft and Conducting

Cited by 64 publications

References 45 publications

Improved mechanical properties of poly (vinyl alcohol) films with glycerol plasticizer by uniaxial drawing

Improved mechanical properties of poly (vinyl alcohol) films with glycerol plasticizer by uniaxial drawing

Conductive Hydrogels as Smart Materials for Flexible Electronic Devices

A Polyaniline‐Based Redox‐Active Composite Gel Electrolyte with Photo‐Electric and Electrochromic Properties

Contact Info

Product

Resources

About