Changes in Crystallization Behaviors of Poly(Vinyl Alcohol) Induced by Water Content

Xiang, Aimin; Lv, Chang; Zhou, Hongfu

doi:10.1002/vnl.21775

Cited by 21 publications

(12 citation statements)

References 34 publications

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“…Nowadays, more attentions have been focused on the thermal processing of PVA. [5][6][7][8][9][10][11] The key is to enlarge the processing window of PVA via chemical or physical modification. By carboxylation and carbodiimide reaction, Li [12] prepared the dopamine-functionalized PVA elastomer with melt processability and self-healing properties.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of poly(vinyl alcohol) bottle with high barrier property and mechanical property via compound plasticization

Zuo

et al. 2022

Vinyl Additive Technology

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The conventional solution method can hardly manufacture the three‐dimensional poly(vinyl alcohol) (PVA) part, thus blocking its further industrial development. Complex‐shaped PVA products could be fabricated by thermal processing, however, the migration of plasticizers in PVA melt‐processed products frequently leads to deteriorated performance and limited application. In this article, part glycerol was replaced by solid polyols with higher molecular weight in compound plasticizing systems, finally realizing the continuous production of three‐dimensional PVA bottles. The remaining glycerol offered the easy access for solid polyols to enter the PVA molecules, which provided better stability for the plasticized system during the blow molding processing. With the incorporation of solid polyols, the migration behaviors of plasticizers were remarkably inhibited. The extraction migration rate was remarkably reduced from 54.1% to 7.4%, and the contact migration rate was reduced from 14.0% to 5.4%. The environmental‐friendly PVA bottles possessed the excellent barrier properties and axial bearing pressure capacity. The permeation rate of petroleum ether was reduced from 1.6 to 0.9 g·mm/m2·day, and the axial bearing pressure was increased from 74.3 to 148.7 N, demonstrating the promising application for PVA in barrier packaging fields.

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Section: Introductionmentioning

confidence: 99%

Fabrication of poly(vinyl alcohol) bottle with high barrier property and mechanical property via compound plasticization

Zuo

et al. 2022

Vinyl Additive Technology

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“…Due to the abundance of hydroxy groups, PVOH typically has a relatively low portion of a highly ordered, crystalline phase. However, heating the semicrystalline polymer above its glass-transition temperature ( T g = 80 °C) but below its melting point ( T m = 200 °C) increases polymer chain mobility and removes excess bound water (and subsequently disrupts the hydrogen bonding network) . The combined effect of these two factors will result in further alignment of the PVOH polymer chains and thus an increase in Χ C .…”

Section: Resultsmentioning

confidence: 99%

Thick Polyvinyl Alcohol Films Reinforced with Cellulose Nanocrystals for Coating Applications

Niinivaara

Desmaisons

Dufresne

et al. 2021

ACS Appl. Nano Mater.

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The strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) method was used to quantify Young's modulus of polyvinyl alcohol (PVOH) coatings reinforced with cellulose nanocrystals (CNCs). The effect of processing parameters, namely, deposition method and drying temperature, and changes in relative humidity were assessed. The coatings were relatively thick (0.6−17.6 μm) compared to freestanding PVOH/CNC nanocomposite films tested previously, and the ability to robustly measure the modulus of substratesupported coatings without specialized equipment or the need for "model systems" offered new material insights. In solvent cast coatings, the addition of 10 wt % CNCs into PVOH increased Young's modulus from 1.6 ± 0.1 GPa (neat PVOH) to 21 ± 2 GPa. The 13-fold increase in modulus is attributed to three factors: the rigid CNCs forming a percolated network, the high compatibility between CNCs and PVOH, and the CNCs nucleating PVOH crystallitesalmost doubling the matrix degree of crystallinity. Bar coating further increased Young's modulus of the coating by 3.5fold (compared to solvent casting), likely due to alignment of CNCs and PVOH crystallites. Higher drying temperatures and lower relative humidity also improved the CNC/PVOH coating mechanical performance; annealing increased the matrix degree of crystallinity and the modulus (ca. 6 times more for CNC/PVOH coatings than for neat PVOH), and the modulus increased by 0.4 GPa per unit decrease in relative humidity (vs 0.1 GPa for neat PVOH). Overall, CNCs can be used to tailor coating moduli over a wide range and impart higher sensitivity to processing parameters; furthermore, SIEBIMM is a facile tool to quantify mechanical properties of nanocomposite coatings prepared in different ways, such that their performance and potential applications may be fully assessed.

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“…Finally, the crystallinity of NFs is an important parameter in the biodegradation of polymers, as the crystalline regions of polymers hinder the degradation of polymeric scaffolds contrary to the amorphous regions [ 57 ]. PBS [ 69 ], PCL [ 63 ], PLA [ 65 ] and PVA [ 72 ] are semi-crystalline polymers whose crystallinity in NFs-membranes can be reduced by the addition of WK. Additionally, solvents such as HFIP not only rise the content of α−helix structures but can also increase the crystallinity of nanofibrous membranes as a consequence of a greater dielectric constant value [ 78 ].…”

Section: Wk and Biodegradable Polymers—nfsmentioning

confidence: 99%

Wool Keratin Nanofibers for Bioinspired and Sustainable Use in Biomedical Field

Ramírez

Vineis

Cruz‐Maya

et al. 2022

JFB

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Keratin is a biocompatible and biodegradable protein as the main component of wool and animal hair fibers. Keratin-based materials support fibroblasts and osteoblasts growth. Keratin has been extracted by sulphitolysis, a green method (no harmful chemicals) with a yield of 38–45%. Keratin has been processed into nanofibers from its solutions by electrospinning. Electrospinning is a versatile and easy-to-use technique to generate nanofibers. It is an eco-friendly and economical method for the production of randomly and uniaxially oriented polymeric nanofibers. Thanks to their high specific surface area, nanofibers have great potential in the biomedical field. Keratin nanofibers have received significant attention in biomedical applications, such as tissue engineering and cell growth scaffolds, for their biocompatibility and bio-functionality. Accordingly, we propose an extensive overview of recent studies focused on the optimization of keratinbased nanofibers, emphasizing their peculiar functions for cell interactions and the role of additive phases in blends or composite systems to particularize them as a function of specific applications (i.e., antibacterial).

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Changes in Crystallization Behaviors of Poly(Vinyl Alcohol) Induced by Water Content

Cited by 21 publications

References 34 publications

Fabrication of poly(vinyl alcohol) bottle with high barrier property and mechanical property via compound plasticization

Fabrication of poly(vinyl alcohol) bottle with high barrier property and mechanical property via compound plasticization

Thick Polyvinyl Alcohol Films Reinforced with Cellulose Nanocrystals for Coating Applications

Wool Keratin Nanofibers for Bioinspired and Sustainable Use in Biomedical Field

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