Thermal, mechanical, and AC electrical studies of PVA–PEG–Ag2S polymer hybrid material

Devangamath, Shruti S.; Lobo, Blaise; Masti, Saraswati P.; Narasagoudr, Shivayogi S.

doi:10.1007/s10854-019-02835-3

Cited by 19 publications

(29 citation statements)

References 57 publications

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“…It is interesting that T d increased to 326 °C after Ag was coated. It is because the decomposition of volatile spillage was probably delayed by the Ag-coated layer. − The third one appearing at 421 °C was ascribed to the decomposition of the main chain of PVA, which yields carbon and hydrocarbon. , The pyrolysis residue percentage of the LSW/PVA/Ag paper at 650 °C increased from 26.7 to 68.8% with increasing electroless plating time, which was in accordance with the SEM results. Moreover, it is rational to conclude that metallization does no harm to the LSW/PVA substrate.…”

Section: Resultssupporting

confidence: 80%

From Waste to Wealth: A Lightweight and Flexible Leather Solid Waste/Polyvinyl Alcohol/Silver Paper for Highly Efficient Electromagnetic Interference Shielding

Zeng

Huang

Jiang

et al. 2020

ACS Appl. Mater. Interfaces

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With the popularization of 5G communications and the internet of things, electromagnetic wave (EW) radiation pollution has aroused much concern from the public, and the search for new materials and technologies for preparing electromagnetic shielding materials still continues all around the world. However, the contradiction among high shielding performance, economic applicability, and flexibility is still not well balanced. Herein, we fabricated a novel foldable leather solid waste (LSW)/polyvinyl alcohol (PVA)/silver (Ag) paper with excellent electromagnetic interference (EMI)-shielding ability using a facile but sustainable electroless plating (ELP) method with LSW as the resource. Taking PVA as a cross-linker, debundled leather fibers (LFs) generated by solid-state shearing milling could generate a flexible LSW/PVA substrate with a high specific surface area, and eventually the deposited Ag layer served as a protective layer not only to significantly improve the mechanical and thermal robustness, but also to endow the LSW/PVA/Ag paper with good hydrophobicity, which could protect from potential moisture damage. In addition to the reflection effect of metallic Ag on EW, the hierarchical structure of collagen fibers played an important role in superior high EMI-shielding effectiveness (∼55–∼90 dB) by an absorption-dominant EMI-shielding mechanism. Furthermore, a multilayer LSW/PVA/Ag paper was also prepared with enhanced EMI-shielding effectiveness of 111.3 dB benefited by constructing multiple reflection–absorption interfaces. The high-performance, environmentally friendly, and low-cost EMI-shielding materials not only offered a new avenue toward recycling LSW in a more value-added way, but also displayed promising potential for application in flexible shielding materials or wearable clothing.

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Section: Resultssupporting

confidence: 80%

From Waste to Wealth: A Lightweight and Flexible Leather Solid Waste/Polyvinyl Alcohol/Silver Paper for Highly Efficient Electromagnetic Interference Shielding

Zeng

Huang

Jiang

et al. 2020

ACS Appl. Mater. Interfaces

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“…The structure and cooperative mobility of the polymer-chain segments determine a blended system's glass-transition temperature (T g ), which is a reflection of the miscibility of the polymer blend. 48 The T g and the intensity of the absorbing and exothermic peaks of the DSC curves of the composite gel changed to different degrees compared to those of pure PVA; this was due to the reduction of mobility between polymer chains caused by the formation of hydrogen bonds between OH and C═O groups of PVA and end groups of PEG after mixing and is consistent with the FTIR findings in Figure 1d. 49…”

Section: Xrd Raman Tga and Dsc Analysissupporting

confidence: 85%

Double‐network polyvinyl alcohol composite hydrogel with self‐healing and low friction

Zhang

et al. 2021

J of Applied Polymer Sci

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Polyvinyl alcohol (PVA) hydrogel is considered the most promising candidate for artificial cartilage because of its good lubricity and low permeability. However, the efficacy of single-network PVA hydrogels under variable loads has not yet been determined. In this study, a one-step physical-cross-linking method was used to compose PVA/PEG double-network composite hydrogels. We changed the polyethylene glycol (PEG) content of the composite gel and tested the frictional-wear performance under different loads and speeds. With the mass fraction of PEG at 30 wt.%, the hardness of the PVA/PEG composite gel increased to 167.7% that of pure PVA. Under dry-friction conditions, the average coefficient of friction was approximately 0.14 and the wear rate on the surface of the hydrogel was insignificant. The cross-linking between PVA and PEG greatly enhanced the stability of the composite hydrogel polymer network. The structure of the composite gel was analyzed by a variety of standard methods. The hydrogel has excellent biocompatibility and self-healing ability and is a self-lubricating, self-healing candidate material for articular-cartilage repair.

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“…The increase in temperature above 300 °C resulted in significant weight loss due to the α-cellulose decomposition of cotton. PEG-6000 is stable up to 350 °C, and subsequent increases in temperature cause it to continuously decompose 56 , 57 . In GO-PEG-g-Cotton, the PEG chemical grafting on the cotton backbone contributed to increased carbon–carbon and ester bonds, resulting in its better heat stability up to 320 °C.…”

Section: Resultsmentioning

confidence: 99%

Cotton functionalized with polyethylene glycol and graphene oxide for dual thermoregulating and UV-protection applications

Kumar

Kebaïli

Boukhris

et al. 2023

Sci Rep

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A thermoregulating smart textile based on phase change material (PCM) polyethylene glycol (PEG) was prepared by chemically grafting carboxyl-terminated PEG onto cotton. Further deposits of graphene oxide (GO) nanosheets were made on the PEG grafted cotton (PEG-g-Cotton) to improve the thermal conductivity of the fabric and to block harmful UV radiation. The GO-PEG-g-Cotton was characterized by Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), Raman spectroscopy, X-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and field emission-scanning electron microscopy (FE-SEM). With an enthalpy of 37 and 36 J/g, respectively, the DSC data revealed that the functionalized cotton's melting and crystallization maxima occurred at 58 °C and 40 °C, respectively. The thermogravimetric analysis (TGA) presented that GO-PEG-g-Cotton was thermally more stable in comparison to pure cotton. The thermal conductivity of PEG-g-Cotton increased to 0.52 W/m K after GO deposition, while pure cotton conductivity was measured as 0.045 W/m K. The improvement in the UV protection factor (UPF) of GO-PEG-g-Cotton was observed indicating excellent UV blocking. This temperature-regulating smart cotton offers a high thermal energy storage capability, better thermal conductivity, thermal stability, and excellent UV protection.

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Thermal, mechanical, and AC electrical studies of PVA–PEG–Ag2S polymer hybrid material

Cited by 19 publications

References 57 publications

From Waste to Wealth: A Lightweight and Flexible Leather Solid Waste/Polyvinyl Alcohol/Silver Paper for Highly Efficient Electromagnetic Interference Shielding

From Waste to Wealth: A Lightweight and Flexible Leather Solid Waste/Polyvinyl Alcohol/Silver Paper for Highly Efficient Electromagnetic Interference Shielding

Double‐network polyvinyl alcohol composite hydrogel with self‐healing and low friction

Cotton functionalized with polyethylene glycol and graphene oxide for dual thermoregulating and UV-protection applications

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