Preparation and properties of PVA films using hydroxyalkylformamides as the plasticizers

Dai, Hai Tao; Wang, Juan; Wang, Lirong

doi:10.1002/pen.24761

Cited by 8 publications

(2 citation statements)

References 49 publications

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“…Therefore, to enhance the structural homogeneity of PVA films and augment its ductility, low molecular weight plasticizers are frequently incorporated into PVA solutions. The majority of small molecules employed for plasticizing PVA consist of polyols, − amides, , and amines. − Water molecules also have the capability to form hydrogen bonds with PVA, making them suitable for PVA modification. − The −OH or amide groups in these small molecules form hydrogen bonds with PVA, substituting a certain proportion of the existing PVA intramolecular and intermolecular hydrogen bonds. The addition of plasticizers also leads to an expansion in the cavity dimensions of the polymer and enhances the chain activity of PVA .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Suppression of the Skin-Core Structure of Poly(vinyl alcohol) Films by Adding Urea/Diethanolamine to Improve the Mechanical and Optical Properties

Li,

Liu,

et al. 2024

Macromolecules

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The microstructure of poly(vinyl alcohol) films formed during the solution drying process significantly influences their tensile ductility and optical transmittance. However, the "skin-core" structure of the dried PVA film is very obvious since the PVA solution dries extremely fast at a relatively low initial concentration (C 0 ). Herein, we propose a strategy to reduce the evaporation rate through the incorporation of plasticizer-type additives. For this purpose, urea and diethanolamine (DEA) were selected as the compound additives. On the one hand, the solubility of urea in water was improved by DEA because DEA is a good solvent for urea. On the other hand, more intermolecular hydrogen bonds were formed between the primary amine groups on urea and the hydroxyl (−OH) groups on PVA. The formation of PVA−plasticizer hydrogen bonding networks significantly prolonged the deceleration drying period and slowed down the drying process of the solution. In addition, the reduction in the content of single hydrogen-bonded water also favored the acquisition of a homogeneous structure. When the content of the urea/DEA compound additives was over 10%, the "skin-core" structure was suppressed. The structural changes in films have had an impact on both mechanical and optical performances. The fracture strain of the modified PVA film reaches 448.2%, and the average light transmittance in the visible range reaches 97.8% when the content of the compound additive is 20% of the PVA mass. These values are much higher than those of the control film, which are 9.2 and 92.2%, respectively. This study enhances comprehension of the film-forming mechanism and structural changes in PVA/H 2 O/plasticizer systems, offering theoretical insights for improved industrial processing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Suppression of the Skin-Core Structure of Poly(vinyl alcohol) Films by Adding Urea/Diethanolamine to Improve the Mechanical and Optical Properties

Li,

Liu,

et al. 2024

Macromolecules

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Exploitation of acetalization process of poly(vinyl alcohol) for the formation of crosslinked poly(vinyl formal) foams

Liao

Liu

2020

Polymer Engineering & Sci

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In the present work, poly(vinyl formal) (PVF) foams were prepared using water as the pore‐forming agent and formaldehyde as the crosslinking agent. The acetalization process of poly(vinyl alcohol) was exploited in depth in order to obtain a precise guidance on the preparation of PVF foams with adjustable properties. With the increasing of formaldehyde, the crosslinking degree was gradually increased and the prepared PVF foams changed to be amorphous. Morphology observation showed that the porous structure of PVF foams was successfully created using water as the blowing agent and it was strongly affected by the crosslinking agent and polymer concentration, leading to an easily tuned pore size from hundreds of microns to few microns. The prepared foams were proved to have small apparent density below 0.27 g/cm−3 and excellent mechanical strength, with the largest specific compressive strength of 11.54 MPa·cm3·g−1. Based on the results, it is believed that this study can provide a scientific basis for the design and optimization of PVF foams with controllable structure and properties.

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Effect of sodium 2‐acrylamido‐2‐methylpropanesulfonate on the structure and properties of thermoplastic polyvinyl alcohol copolymers

Wang,

Zhao,

Song

et al. 2024

Polymer International

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Thermoplastic poly(vinyl alcohol) (PVA) with water‐soluble behavior has received great attention. In this work, a thermoplastic PVA was prepared via solution radical polymerization of vinyl acetate, vinyl pivalate and sodium 2‐acrylamido‐2‐methyl propane sulfonate (SAMPS). The effects of SAMPS content on the structure and properties of modified poly(vinyl alcohol) (MPVA) were investigated. On increasing the proportion of SAMPS, the characteristic band of –OH moved to a larger wavenumber. Compared to PVA, the melting temperature (Tm) of MPVA decreased from 223.1 to 161.5 °C at 0.03 mol of SAMPS, and the initial thermal decomposition temperature (Td) of MPVA increased from 244.3 to 262.2 °C at 0.05 mol of SAMPS. The crystallinity of the resin reduced from 51.46% to 10.21%. The enlarged difference between Td and Tm ensured the preparation of MPVA by thermal processing. The maximum tensile strength and elastic modulus of the obtained sheets were 137.56 and 2639.32 MPa, respectively. The introduction of SAMPS reduced the alcoholysis degree from 99.03% to 95.80%. The high alcoholysis degree of MPVA meant that it could be dissolved in water at 60 °C. This type of thermoplastic PVA shows a promising application on film and textiles that require water solubility. © 2024 Society of Chemical Industry.

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Preparation and properties of PVA films using hydroxyalkylformamides as the plasticizers

Cited by 8 publications

References 49 publications

Suppression of the Skin-Core Structure of Poly(vinyl alcohol) Films by Adding Urea/Diethanolamine to Improve the Mechanical and Optical Properties

Suppression of the Skin-Core Structure of Poly(vinyl alcohol) Films by Adding Urea/Diethanolamine to Improve the Mechanical and Optical Properties

Exploitation of acetalization process of poly(vinyl alcohol) for the formation of crosslinked poly(vinyl formal) foams

Effect of sodium 2‐acrylamido‐2‐methylpropanesulfonate on the structure and properties of thermoplastic polyvinyl alcohol copolymers

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