Aqueous poly(N-Vinylformamide-co-Vinylamine) as a suitable adhesion promoter for wood veneer/biopolyethylene composite materials

John, Rico; Trommler, Katja; Schreiter, Katja; Siegel, Carolin; Simon, Frank; Wagenführ, André; Spange, Stefan

doi:10.15376/biores.12.4.8134-8159

Cited by 8 publications

(1 citation statement)

References 38 publications

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“…We also used a perovskite-free MG film as a control. The N 1s XPS spectrum of the perovskite-free MG film (Figure A) shows a single component centered at 399.5 eV binding energy (BE), which is assigned to the OC– N H– groups − from the MG. The N 1s XPS spectra for the MG-free (39, 0) and (10, 1.2) films (Figure A) have two components.…”

Section: Resultsmentioning

confidence: 99%

Modulating Crystallization in Semitransparent Perovskite Films Using Submicrometer Spongelike Polymer Colloid Particles to Improve Solar Cell Performance

Dokkhan

Mokhtar

et al. 2019

ACS Appl. Energy Mater.

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Semi-transparent perovskite solar cells (PSCs) have excellent potential for solar window applications. A major challenge exists, however, in achieving uniform coverage for thin perovskite films. Unfortunately, uncontrolled pinhole formation is a common problem for such films that obstructs development, especially for large area devices. In this study we used very small (submicrometer) swellable polymer colloid particles (microgels) as additives to prepare uniform thin CH 3 NH 3 PbI 3 (MAPI) perovskite films. Microgels (MGs) are good film-formers and promoted formation of semi-transparent (ST) perovskite films with improved coverage. The MGs act as colloidal sponges and delayed release of perovskite precursors, thereby delaying perovskite crystallization. The ST films prepared using MGs had fewer pinholes compared to the MG-free control films. X-ray photoelectron spectroscopy showed evidence of Pb coordination by the MGs and they were shown to passivate MAPI. Remarkably, the sub-micrometer MGs used in this study decreased light scattering for the ST films. Planar devices constructed using a 10 nm ST film with an average visible transmittance of 46.8% gave an average power conversion efficiency (PCE) of 7.69% which compares favourably to literature values. The average PCE increased to 9.62% upon inclusion of a thin meso-TiO 2 layer. These PCE values are significantly higher than that achieved for the MG-free ST control (4.93%). The MGs and approaches used here are scalable and should apply to other ST perovskite films, solar cells and potentially to tandem devices.

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Section: Resultsmentioning

confidence: 99%

Modulating Crystallization in Semitransparent Perovskite Films Using Submicrometer Spongelike Polymer Colloid Particles to Improve Solar Cell Performance

Dokkhan

Mokhtar

et al. 2019

ACS Appl. Energy Mater.

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Highly Efficient Solid‐State Supercapacitor with Porous Electrode Material

Pulikkottil,

Thomas,

Malamal Neelanchery

et al. 2023

Energy Tech

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Herein, a flexible solid‐state supercapacitor (FSC) with a high level of efficiency with porous electrode material derived from mahogany fruit shell waste (MS) is reported. The mahogany‐fruit‐shell‐derived activated carbon (MSAC) is produced using chemical activation, followed by carbonization at various carbonization temperatures (500, 600, 700, and 800 °C) and activation ratios (MS:KOH = 1:1, 1:2, and 1:3). The high‐performance MSAC has an intricate porous structure with a surface area of 1072 m2 g−1. It exhibits a specific capacitance of 267 F g−1 and outstanding capacitance retention of 97% even after 10 000 charge–discharge cycles. The MSAC‐based FSCs are constructed utilizing a gel polymer electrolyte (poly(vinyl alcohol)|sodium sulfate), and their performance is compared with that of conventional supercapacitor systems. The MSAC‐based FSC shows a very high specific capacitance of 121 F g−1, which is remarkably superior to previously reported FSCs. Additionally, as‐prepared FSC exhibits wide electrochemical window, flexibility, ease of handling, safety, along with a high capacitance retention of 78% after 2000 charging–discharging cycles. These exceptional capacitive properties, such as its extended cycle life and excellent rate capability, suggest that it is a potential alternative for a range of next‐generation energy storage applications.

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The Reaction of Poly(Vinyl Amine) with Acetone in Water

Trommler

Walther

Seifert

et al. 2018

Macro Chemistry & Physics

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Poly(vinyl amine) (PVAm) reacts with acetone in aqueous solution. It generates imine and aminal moieties along the PVAm backbone. The molecular structure of acetone‐modified PVAm is confirmed by liquid 1H and 13C as well as solid state 13C NMR and ATR‐FTIR spectroscopies. Model compounds produced from 1,3‐diaminopropane with acetone in chloroform are used to assign the solid state 13C NMR signals of the modified polymer. Quantitative elemental analysis of acetone‐modified PVAm samples supports the analytical results. The mechanism of the imine and aminal formation is discussed with regard to the anomeric stabilization of the incipient hemiaminal intermediate. The rapid and unexpectedly favorable formation of PVAm acetone hemiaminal, acetone imine, and aminal formation has implications for the conduct of PVAm research and even the interpretation of prior published results. As acetone was often used in the past to precipitate waterborne PVAm derivatives, this finding has a severe impact on the interpretation of research results. The consequences and the revised interpretation of selected publications are discussed.

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Aqueous poly(N-Vinylformamide-co-Vinylamine) as a suitable adhesion promoter for wood veneer/biopolyethylene composite materials

Cited by 8 publications

References 38 publications

Modulating Crystallization in Semitransparent Perovskite Films Using Submicrometer Spongelike Polymer Colloid Particles to Improve Solar Cell Performance

Modulating Crystallization in Semitransparent Perovskite Films Using Submicrometer Spongelike Polymer Colloid Particles to Improve Solar Cell Performance

Highly Efficient Solid‐State Supercapacitor with Porous Electrode Material

The Reaction of Poly(Vinyl Amine) with Acetone in Water

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