Effect of crosslinking on the mechanical and thermal properties of poly(vinyl alcohol)

Krumova, Marina; López, Daniel; Benavente, Rosario; Mijangos, Carmen; Pereña, José M.

doi:10.1016/s0032-3861(00)00287-1

Cited by 518 publications

(345 citation statements)

References 13 publications

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“…In fact in the dried state, T g results from several main combining parameters: the crosslinking density and the hydrogen bonds between hydroxyl groups of PVOH chains but also the intrinsic flexibility of PVOH and CTR chains. As shown in literature, these two parameters acted by a compensation effect between the weakening of the chemical network and the plasticizing effect of the introduced more or less flexible linkers [27]. When films are hydrated and swollen under equilibrium, the decreasing gap of T g for 10 wt% CTR is much more pronounced than the one for 40 wt% CTR.…”

Section: 2mentioning

confidence: 73%

New crosslinked cast films based on poly(vinyl alcohol): Preparation and physico-chemical properties

Birck¹,

Degoutin²,

Tabary³

et al. 2014

Express Polym. Lett.

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Section: 2mentioning

confidence: 73%

New crosslinked cast films based on poly(vinyl alcohol): Preparation and physico-chemical properties

Birck¹,

Degoutin²,

Tabary³

et al. 2014

Express Polym. Lett.

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“…The following bands were observed for lignin: (a) the absorbance of OH bands at 3352 and 1033 cm -1 ; (b) β-O-4 ether bond band at 1117 cm −1 ; (c) methoxy group band at 2939, 2881, 1460, and 1425 cm −1 ; (d) the C=C vibration of aromatic rings at 1514 cm −1 ; (e) the band at 1603 cm −1 , which is characteristic for quinoid structure; and (f) the carbonyl group at 1664 and 1720 cm −1 (Rodrigues et al 2002;Yang et al 2011). In the spectra of the PVOH film, the 3282-cm −1 and 2930-cm −1 peaks are the -OH and -CH2-stretching vibrations (Krumova et al 2000), respectively. The bending vibration of -OH is at 1410~1260 cm −1 .…”

Section: Atr-ftir Analysismentioning

confidence: 99%

Characterization of Cross-linked Alkaline Lignin/Poly (Vinyl Alcohol) Film with a Formaldehyde Cross-linker

Su¹,

Gui-zhen²

2014

BioResources

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On the basis of previous experiments, industrial alkaline lignin/poly (vinyl alcohol) (PVOH) cross-linked films, industrial alkaline lignin/poly (vinyl alcohol) blend films, and neat poly (vinyl alcohol) films were prepared by casting. The films were investigated by Fourier transform infra-red spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetry analysis (TGA), and dynamic mechanical analysis (DMA). The water contact angles for the three kinds of films were studied as well. The crosslinking reaction between alkaline lignin and PVOH was strong, which was attributed to the high hydrolysis degree of PVOH and the high reactivity of formaldehyde. Compared with the neat PVOH film, the crystallinity of the cross-linked film decreased slightly; the thermal stability of the crosslinked film was higher; DMA analysis showed that the Tg and the tanδ magnitude of the alkaline lignin/PVOH reaction film both decreased slightly. Lignin and the cross-linking reaction both improved the water resistance of films. Therefore, this research has provided a detailed analysis of the characterization of the films while exploring the potential of direct usage of industrial alkaline lignin in polymer materials.

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“…The cross-linking restricts local chain mobility thereby increases T g . 13 Moreover, a higher thermal stability is induced by the cross-linking, 14 implying the feasibility of application of the biofunctionalized membrane at higher temperatures than ambient temperature but certainly lower than denaturation temperature of the BSA.…”

Section: Resultsmentioning

confidence: 99%

Biofunctionalized nanofibrous membranes mimicking carnivorous plants

Homaeigohar

Disci-Zayed²,

Dai

et al. 2013

Bioinspired, Biomimetic and Nanobiomaterials

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A novel biofunctionalized nanofibrous membrane is developed through immobilization of protein ligands on the surface of nanofibers. The biofunctionalization not only enhances the membrane's structural properties including mechanical and thermal ones but also makes the membrane capable to separate nanoparticles and biomolecules much smaller than the pore size from water efficiently. Upon contact with water, the conformational change of the protein immobilized leads to its swelling, thereby an enlarged functional surface area and a higher steric hindrance capturing the filtrates. In case of filtration of a plasmonic nanoparticle containing suspension, decoration of the membrane with the plasmonic nanoparticles forms a smart bionanocomposite biosensor for detection of protein denaturation. IntroductionMembrane technology for water treatment is steadily gaining very high importance worldwide. This is primarily due to water pollution and dwindling fresh water supplies leading to water scarcity. Water quality has to be controlled to ensure a safer environment by implementing efficient technologies such as advanced membranes offering more output with less input, that is, efficient energy saving membranes. Electrospun nanofibrous membranes (ENMs) that have the potential to be used as advanced membrane systems will be able to remove pollutants from the environment at lower energy and hence cost.1 Energy saving by ENMs derives from their high interconnected porosity leading to a very high permeability.2 Despite an extraordinary permeability, ENMs suffer from low size selectivity. Microfiltration (MF) range pore size of ENMs makes them efficient in removing relatively coarse particles and suspended solids but not tiny substances smaller than the pore size. [3][4][5][6][7] Considering the importance of separation of nanoparticles also organics that can be detrimental to the quality of water systems, optimizing the selectivity of such membranes could be crucial. Accordingly, not only the high permeability of the membrane is preserved but also on the basis of selectivity, the application domain would be extended from MF to ultrafiltration (UF) and even nanofiltration. Long-term functionality, that is, longevity of ENMs with regard to their extraordinary surface area thereby a higher exposed surface to the water streams is dependent on their mechanical stability. Hence, to maximize the efficiency of an ENM, besides the optimization of the selectivity, its mechanical stabilization should be also stressed.Here, we show that through one-single approach, that is, protein functionalization, an ENM can acquire mechanical and thermal stability while showing more optimum selectivity. Inspired by the

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Effect of crosslinking on the mechanical and thermal properties of poly(vinyl alcohol)

Cited by 518 publications

References 13 publications

New crosslinked cast films based on poly(vinyl alcohol): Preparation and physico-chemical properties

New crosslinked cast films based on poly(vinyl alcohol): Preparation and physico-chemical properties

Characterization of Cross-linked Alkaline Lignin/Poly (Vinyl Alcohol) Film with a Formaldehyde Cross-linker

Biofunctionalized nanofibrous membranes mimicking carnivorous plants

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