Determination of degradation kinetics of polyvinyl alcohol/X-zeolite nanocomposite

Roushan, Alireza Hassanjani; Omrani, Abdollah; Kavian, Safura; Azizi, Seyed Naser

doi:10.1007/s10973-016-5998-1

Cited by 7 publications

(5 citation statements)

References 33 publications

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“…The temperature range of room temperature to 100 °C corresponds to the volatilization of free water from the aerogel, while the temperature range of 100–250 °C corresponds to the desorption of bound water and free small molecules present in the aerogel. Within the temperature range of 250–400 °C, the aerogels experienced notable weight loss, attributed to the decomposition of the polymer matrix, comprising CNF, PVA, and PEI. ,, In addition, this decomposition also involved the cleavage of various chemical bonds such as imine bonds and other relevant bonds. , …”

Section: Resultsmentioning

confidence: 99%

“…Within the temperature range of 250−400 °C, the aerogels experienced notable weight loss, attributed to the decomposition of the polymer matrix, comprising CNF, PVA, and PEI. 31,34,35 In addition, this decomposition also involved the cleavage of various chemical bonds such as imine bonds and other relevant bonds. 36,37 With an increased addition of PDA@CNF, the aerogels exhibited an elevated maximum decomposition rate and a lowered peak degradation temperature (Figure 6b), indicating reduced thermal stability.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Polydopamine-Anchored Cellulose Nanofiber Flexible Aerogel with High Charge Transfer as a Substrate for Conductive Materials

Du,

Shi,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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In order to obtain a flexible aerogel substrate for conductive materials used in the electrode, polydopamine-anchored cellulose nanofiber (PDA@CNF) was introduced into a polyethylene imine-poly(vinyl alcohol) (PEI−PVA) cross-linking network which used 4-formylphenylboronic acid (4FPBA) as bridge. The incorporation of rigid CNF as a structural scaffold effectively improved the pore architecture of the aerogel, potentially providing substantial advantages for the infiltration and deposition of conductive materials. Additionally, the outstanding stability and flexibility exhibited by the aerogel in aqueous solutions suggest its significant potential for applications in flexible electrodes. Furthermore, electrochemical experiments showed that the rapid pathway formed between PDA and PEI could enhance the chargetransfer rate within the aerogel substrate. It is anticipated that such an enhancement would significantly benefit the electrochemical attributes of the electrode. Inspired by mussels, our introduced PDA-anchored rigid CNF into flexible polymer networks to fabricate aerogel substrates for electrode materials. This study would contribute to the development and utilization of flexible electrodes while reducing carbon footprint in energy production and conversion processes.

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Section: Resultsmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Polydopamine-Anchored Cellulose Nanofiber Flexible Aerogel with High Charge Transfer as a Substrate for Conductive Materials

Du,

Shi,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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“…The next two distinct and non‐well separated steps of pure PVA film from 240 to 370 °C (∼60%) and 370 to 490 °C (∼15%), while the relevant steps of PVA composite films are shifted toward a higher temperature range from 285 to 380 °C (∼25%) and 380 to 490 °C(∼40%), two corresponding mass‐reducing peaks in the DTG curves [Figure (B)] and DSC curves [Figure (C)] of all films can be clearly seen. This can be attributed to the dehydration reaction on the PVA chain and degradation of main backbones . Therefore, the thermal decomposition of the PVA matrix can be regarded as a two‐step processes and the decomposition temperature of PVA composite films are higher than pure PVA film.…”

Section: Resultsmentioning

confidence: 99%

“…This can be attributed to the dehydration reaction on the PVA chain 28,41 and degradation of main backbones. 42,43 Therefore, the thermal decomposition of the PVA matrix can be regarded as a two-step processes and the decomposition temperature of PVA composite films are higher than pure PVA film.…”

Section: Article Wileyonlinelibrarycom/appmentioning

confidence: 99%

Dual‐bonding structured ternary composite film of poly(vinyl alcohol)–boric acid–nanodiamond

Zhao

et al. 2017

J of Applied Polymer Sci

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Ternary composite films of poly(vinyl alcohol) (PVA), boric acid (BA), and detonation nanodiamond (DND) were prepared by aqueous solution method. Because of its excellent mechanical/thermal properties and low friction coefficient, DND is expected to offer PVA film superior performance if the puzzles of particle agglomeration in polymer matrix and fragile interface reaction between DND and PVA can be settled. BA was used as a crosslinking agent to form a strong network structure between DND and PVA. Investigation on microstructure of PVA/BA/DND films and bonding mechanisms therein shows that BA, DND, and PVA may crosslink by oxo‐bridges owing to the interaction of hydroxyl groups. The Young's modulus (E) of composite films was enhanced by nearly 3.3 times with only 0.8 wt % DND loading, and the antiwear, thermal stability, and waterproof properties can be significantly improved after the crosslinking. Meanwhile, the transparency of composite films can be well preserved even with large DND content. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45449.

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“…Zeolites are well known as porous materials, and several have proton conducting properties [8,9]. PVA is well known as a water-soluble polymer, and many studies on zeolite-PVA composite films have been reported for various applications [10][11][12][13][14][15], and most of these studies utilized an aldehyde cross-linking reaction in acidic condition (Figure 2) [15,16]. Cross-linking of PVA can be carried out in thin film form, which is very important in this study, since the PVA can easily be cross-linked by penetration of the cross-linker aqueous solution after composite film preparation.…”

Section: Introductionmentioning

confidence: 99%

Proton-conductive nano zeolite-PVA composite film as a new water-absorbing electrolyte for water electrolysis

Nishihara¹,

Terayama

Haji

et al. 2018

Express Polym. Lett.

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Abstract. In this study, organic-inorganic composite electrolyte membranes are developed for a novel water-absorbing porous electrolyte water electrolysis cell. As the materials of the composite electrolyte membrane, 80 wt% of a proton-conducting nano zeolite (H-MFI) as an electrolyte and 20 wt% of poly(vinyl alcohol) (PVA) as a cross-linkable matrix are used. The nano zeolite is prepared by a milling process. The nano zeolite-PVA composite membrane precursors are prepared by spraying onto a substrate, followed by cross-linking. The resulting nano zeolite-cross-linked PVA composite films are then evaluated for their properties such as proton conductivity as electrolyte membranes for the water-absorbing porous electrolyte water electrolysis cell. It is confirmed that conventional materials such as zeolites and PVA can be used for the water electrolysis as an electrolyte.

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Determination of degradation kinetics of polyvinyl alcohol/X-zeolite nanocomposite

Cited by 7 publications

References 33 publications

Polydopamine-Anchored Cellulose Nanofiber Flexible Aerogel with High Charge Transfer as a Substrate for Conductive Materials

Polydopamine-Anchored Cellulose Nanofiber Flexible Aerogel with High Charge Transfer as a Substrate for Conductive Materials

Dual‐bonding structured ternary composite film of poly(vinyl alcohol)–boric acid–nanodiamond

Proton-conductive nano zeolite-PVA composite film as a new water-absorbing electrolyte for water electrolysis

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