Synthesis of syndiotacticity-rich high polymerization degree PVA polymers with VAc and VPa, fabrication of PVA fibers with superior mechanical properties by wet spinning

Wang, Huajun; He, Junwei; Zou, Liming; Wang, Chao; Wang, Yanli

doi:10.1007/s10965-021-02752-2

Cited by 9 publications

(10 citation statements)

References 45 publications

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“…The high S-diad PVA fiber is more likely to crystallize, which is conducive to enhancing stretch efficiency. 26,36,37 And it is consistent with higher fiber hot-drawing ratios, which could improve mechanical qualities. 38 Figure 3D-F depicts the form of as-spun PVA fibers that have not undergone thermal stretching.…”

Section: Sem Of Pva Fiberssupporting

confidence: 56%

“…This is because the high P n PVA fiber has a low proportion of terminal defects on the macromolecular chains, which is conducive to enhancing the stretch ratio. The high S‐diad PVA fiber is more likely to crystallize, which is conducive to enhancing stretch efficiency 26,36,37 . And it is consistent with higher fiber hot‐drawing ratios, which could improve mechanical qualities 38 …”

Section: Resultsmentioning

confidence: 68%

“…Consequently, more heat is required to break the hydrogen bond and release the PVA molecular chain from its restriction of movement and melting, thereby increasing the T m and ∆H m . The increased X c1 in PVA fibers was most likely a result of the strong hydrogen bond of S‐diad , which generates a high‐crystallization rate, 9,12,16 and an ordered association of PVA molecules 26 . In addition, the orderly and tight arrangement of PVA molecules that results from the hot‐drawing process can assist crystallization.…”

Section: Resultsmentioning

confidence: 99%

“…Using VAc/VPa as the monomers, we have presented a method for producing high P n and high S‐diad PVA polymer. This method has been employed successfully to produce PVA fiber with a tensile strength of 11.49 cN/dtex and an elastic modulus of 316.43 cN/dtex 26 . The strength and modulus were enhanced by 18.3% and 19.6%, respectively, compared to the fibers spun by the PVA polymer synthesized from a single VAc monomer, which was still insufficient.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of high‐strength, high‐modulus PVA fiber by synthesis of syndiotacticity‐rich high molecular weight PVA polymers with VAc and VBz via emulsifier‐free emulsion polymerization

Wang

Zou

et al. 2023

Polymers for Advanced Techs

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Different vinyl acetate (VAc) and vinyl benzoate (VBz) monomer ratios have been chosen as monomers to create high polymerization degree (Pn) and high syndiotacticity‐diad content (S‐diad) poly(vinyl alcohol) (PVA) polymers via emulsifier‐free polymerization in order to address the problem of limited mechanical capabilities of PVA fibers prepared with low Pn and low S‐diad polymer. The variations in hydrogen bonding, Pn, S‐diad, and viscosity of different PVA polymers were investigated and evaluated using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, gel permeation chromatography, and a viscosity tester. Moreover, various PVA fibers with high strength and modulus have been manufactured using a synthetic polymer as the raw material for dry‐wet spinning. The effect of Pn and S‐diad on the mechanical and thermal characteristics of PVA fibers is evaluated using a variety of characterization techniques, such as the scanning electron microscope, differential scanning calorimetry, thermogravimetric analyzer, X‐ray diffraction, and tensile tester. As the ratio of VBz monomer increased, the results suggested that VBz may have a considerable impact on the Pn and S‐diad of PVA polymers, the OH vibration absorption peak reduced from 3491 to 3442 cm−1; the Pn increased from 2112 to 17,704; and the S‐diad rose from 51.2% to 60.1%. In addition to the fact that Pn and S‐diad significantly increased the fibers' strength and modulus, the crystallinity increased from 41.8% to 51.7%, and the orientation degree rose from 87.5% to 91.7%, as Pn and S‐diad increased; the tensile strength and highest elastic modulus increased from 9.71 ± 0.3 cN/dtex to 12.74 ± 0.5 cN/dtex (increased of 31.2%) and 264.52 ± 9.3 cN/dtex to 338.41 ± 8.6 cN/dtex (increased of 27.9%); the elongation at break decreased from 5.63 ± 0.3% to 2.92 ± 0.2%.

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Section: Sem Of Pva Fiberssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preparation of high‐strength, high‐modulus PVA fiber by synthesis of syndiotacticity‐rich high molecular weight PVA polymers with VAc and VBz via emulsifier‐free emulsion polymerization

Wang

Zou

et al. 2023

Polymers for Advanced Techs

Self Cite

View full text Add to dashboard Cite

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“…The FTIR spectra of three molecular weights of PVA (PVA 3–80, PVA 26–80, and PVA 48–80) are similar, and the wide characteristic absorption peaks observed between 3200 cm −1 and 3550 cm −1 are caused by the OH asymmetric stretching vibration band, and the absorption peaks at 2911 and 2938 cm −1 were caused by CH 2 ‐ asymmetric and symmetric stretching vibration 43,44 . Moreover, the peaks 1715 cm −1 and 1735 cm −1 are due to the stretching ‐C‐O and CO from acetate group respectively, and the peaks at 1374 cm − 1 was caused by CH 3 stretching vibration from acetate group, 45,46 which verifies that they are partially hydrolyzed PVA.…”

Section: Resultsmentioning

confidence: 89%

Investigation of the influences of the molecular weights and dosage ratios of polyvinyl alcohol on para‐aramid nanofibers/polyvinyl alcohol composite aerogels

Ren

Hasuo

Wei

et al. 2022

J of Applied Polymer Sci

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Polymer-based monolithic composite aerogels with a durable cross-linked structure were fabricated using polyvinyl alcohol (PVA) and para-aramid nanofibers (ANFs) as precursors, and supercritical fluid technology as a drying strategy. In order to give a clear insight into ANFs/PVA composite aerogels, we thoroughly investigated the influences of the molecular weights and dosage ratios of PVA on these composite aerogels, and clearly demonstrated the entire process of the evolution of "sol-gel-aerogel." The chemical composition, porous nanostructure, porosity, and mechanical performance of the ANFs/ PVA composite aerogels were characterized by attenuated total reflectance-Fourier transform-infrared spectra (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FE-SEM), nitrogen physical adsorption, and uniaxial compression, respectively. The results revealed the mechanism of the stable composition of ANFs/PVA binary system, and that both the molecular weights and dosage ratios of PVA in the ANFs/PVA composite aerogels have a significant influence on their properties. This work is beneficial to design and fabricate polymer-based aerogels with desirable chemical and physical characteristics, and the obtained ANFs/PVA composite aerogels with appropriate molecular weight and dosage ratio of PVA possess well-balanced comprehensive properties, which offer the potential for a wide range of applications.

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Effects of Plasticizing on Mechanical and Viscous Characteristics of Poly(vinyl alcohol): A Comparative Study between Glycerol and Diethanolamine

Yao

Zhang

Wang

et al. 2023

Macro Materials & Eng

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Although plasticizing materials by modification with small‐molecular chemicals has been extensively utilized in the industrial community, processing poly(vinyl alcohol) (PVA) at high concentrations (CPVA) or with a high degree of polymerization (DP) remains challenging. Optimization the plasticizing conditions is one means of addressing this issue. In this study, two types of frequently used plasticizers, glycerol (GLY) and diethanolamine (DEA), are chosen to plasticize PVA resin with a DP of 2400. Both PVA/plasticizer films possess excellent optical transmittance and mechanical ductility, whereas the films blended with DEA exhibit higher strength than the PVA/GLY films. The viscosity variation in the temperature (Top)–CPVA space is monitored by real‐time viscous flow testing, demonstrating that DEA is more effective for reducing the viscosity of PVA, which should improve the processability, facilitating film‐forming from concentrated solutions. Furthermore, density functional theory calculations and molecular dynamics simulations illustrate that the PVA/DEA system has a lower binding energy, longer hydrogen bond length, and higher isotropic diffusion coefficient, indicating a stable hydrogen bond network and homogenous dispersion of the plasticizer, leading to good solution fluidity and mechanical performance. This study is significant for guiding the design and manufacture of optically transparent, high‐performance PVA films as polarizer precursor.

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Synthesis of syndiotacticity-rich high polymerization degree PVA polymers with VAc and VPa, fabrication of PVA fibers with superior mechanical properties by wet spinning

Cited by 9 publications

References 45 publications

Preparation of high‐strength, high‐modulus PVA fiber by synthesis of syndiotacticity‐rich high molecular weight PVA polymers with VAc and VBz via emulsifier‐free emulsion polymerization

Preparation of high‐strength, high‐modulus PVA fiber by synthesis of syndiotacticity‐rich high molecular weight PVA polymers with VAc and VBz via emulsifier‐free emulsion polymerization

Investigation of the influences of the molecular weights and dosage ratios of polyvinyl alcohol on para‐aramid nanofibers/polyvinyl alcohol composite aerogels

Effects of Plasticizing on Mechanical and Viscous Characteristics of Poly(vinyl alcohol): A Comparative Study between Glycerol and Diethanolamine

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