Robust and Highly Stretchable Chitosan Nanofiber/Alumina-Coated Silica/Carboxylated Poly (Vinyl Alcohol)/Borax Composite Hydrogels Constructed by Multiple Crosslinking

We investigated the mechanical and structural properties of composite hydrogels composed of chitosan nanofiber (ChsNF), positively charged alumina-coated silica (ac-SiO2) nanoparticles, carboxylated poly (vinyl alcohol) (cPVA), and borax. ChsNF/cPVA/borax hydrogels without ac-SiO2 exhibited high Young’s modulus but poor elongation, whereas cPVA/ac-SiO2/borax hydrogels without ChsNF had moderate Young’s modulus but high elongation. ChsNF/ac-SiO2/cPVA/borax hydrogels using both ChsNF and ac-SiO2 as reinforcement agents exhibited high extensibility (930%) and high Young′s modulus beyond 1 MPa at a high ac-SiO2 concentration. The network was formed by multiple crosslinking such as the complexation between borate and cPVA, the ionic complexation between ac-SiO2 and cPVA, and the hydrogen bond between ChsNF and cPVA. Structural analysis by synchrotron small-angle X-ray scattering revealed that the nanostructural inhomogeneity in ChsNF/ac-SiO2/cPVA/borax hydrogel was suppressed compared to those of the ChsNF/cPVA/borax and cPVA/ac-SiO2/borax hydrogels.

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Regulation Mechanism of Graphene Oxide on the Structure and Mechanical Properties of Bio-Based Gel-Spun Lignin/Poly (Vinyl Alcohol) Fibers

10.21203/rs.3.rs-184442/v1 ◽

2021 ◽

Author(s):

Yanhong Jin ◽

Yuanyuan Jing ◽

Wenxin Hu ◽

Jiaxian Lin ◽

Yu Cheng ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Graphene Oxide ◽

Young’S Modulus ◽

Vinyl Alcohol ◽

Young's Modulus ◽

Lignin Content ◽

Poly Vinyl Alcohol ◽

Regulation Mechanism ◽

Composite Fibers

Abstract Lignin has been used as a sustainable and eco-friendly filler in composite fibers. However, lignin aggregation occurred at high lignin content, which significantly hindered the further enhancement of fiber performance. The incorporation of graphene oxide (GO) enhanced the mechanical properties of the lignin/poly(vinyl alcohol) (PVA) fibers and affected their structure. With the GO content increasing from 0 to 0.2%, the tensile strength of 5% lignin/PVA fibers increased from 491 MPa to 631 MPa, and Young's modulus increased from 5.91 GPa to 6.61 GPa. GO reinforced 30% lignin/PVA fibers also showed the same trend. The tensile strength increased from 455 MPa to 553 MPa, and Young's modulus increased from 5.39 GPa to 7 GPa. The best mechanical performance was observed in PVA fibers containing 5% lignin and 0.2% GO, which had an average tensile strength of 631 MPa and a Young’s modulus of 6.61 GPa. The toughness values of these fibers are between 9.9-15.6 J/g, and the fibrillar and ductile fracture microstructure were observed. Structure analysis of fibers showed that GO reinforced 5% lignin/PVA fibers had higher crystallinity, and evidence of hydrogen bonding among GO, lignin, and PVA in the gel fibers was revealed. Further, water resistance and swelling behavior of composite PVA fibers were studied to further evidence the structure change of composite fibers.

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Fabricating high mechanical strength γ-Fe2O3 nanoparticles filled poly(vinyl alcohol) nanofiber using electrospinning process potentially for tissue engineering scaffold

Journal of Bioactive and Compatible Polymers ◽

10.1177/0883911516681328 ◽

2016 ◽

Vol 32 (4) ◽

pp. 411-428 ◽

Cited By ~ 4

Author(s):

Nor Hasrul Akhmal Ngadiman ◽

Noordin Mohd Yusof ◽

Ani Idris ◽

Denni Kurniawan ◽

Ehsan Fallahiarezoudar

Keyword(s):

Tissue Engineering ◽

Mechanical Strength ◽

Young’S Modulus ◽

Flow Rate ◽

Vinyl Alcohol ◽

Young's Modulus ◽

Electrospinning Process ◽

Poly Vinyl Alcohol ◽

Tissue Engineering Scaffolds ◽

Rotating Speed

The use of electrospinning has gained substantial interest in the development of tissue engineering scaffolds due to its ability to produce nanoscale fibers which can mimic the geometry of extracellular tissues. Besides geometry, mechanical property is one of the main elements to be considered when developing tissue engineering scaffolds. In this study, the electrospinning process parameter settings were varied in order to find the optimum setting which can produce electrospun nanofibrous mats with good mechanical properties. Maghemite (γ-Fe2O3) was mixed with poly(vinyl alcohol) and then electrospun to form nanofibers. The five input variable factors involved were nanoparticles content, voltage, flow rate, spinning distance, and rotating speed, while the response variable considered was Young’s modulus. The performance of electrospinning process was systematically screened and optimized using response surface methodology. This work truly demonstrated the sequential nature of designed experimentation. Additionally, the application of various designs of experiment techniques and concepts was also demonstrated. Results revealed that electrospun nanofibrous mats with maximum Young’s modulus (273.51 MPa) was obtained at optimum input settings: 9 v/v% nanoparticle content, 35 kV voltage, 2 mL/h volume flow rate, 8 cm spinning distance, and 3539 r/min of rotating speed. The model was verified successfully by performing confirmation experiments. The nanofibers characterization demonstrated that the nanoparticles were well dispersed inside the nanofibers, and it also showed that the presence of defects on the nanofibers can decrease their mechanical strength. The biocompatibility performance was also evaluated and it was proven that the presence of γ-Fe2O3 enhanced the cell viability and cell growth rate. The developed poly(vinyl alcohol)/γ-Fe2O3 electrospun nanofiber mat has a good potential for tissue engineering scaffolds.

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Highly stretchable gamma-irradiated poly (vinyl alcohol)/Tannic acid composite hydrogels with superior transparency and antibacterial activity

Journal of Polymer Research ◽

10.1007/s10965-021-02777-7 ◽

2021 ◽

Vol 28 (11) ◽

Author(s):

Mingcheng Yang ◽

Wenhui Guo ◽

Shubo Liu ◽

Benshang Zhang ◽

Yang Chen ◽

...

Keyword(s):

Antibacterial Activity ◽

Tannic Acid ◽

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

Composite Hydrogels ◽

Highly Stretchable ◽

Gamma Irradiated

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Porous boron nitride nanofibers as effective nanofillers for poly(vinyl alcohol) composite hydrogels with excellent self-healing performances

Soft Matter ◽

10.1039/d1sm01361k ◽

2022 ◽

Author(s):

Xiangqian Gao ◽

Tiantian Deng ◽

Xindi Huang ◽

Mengmeng Yu ◽

Danyang Li ◽

...

Keyword(s):

Boron Nitride ◽

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

Self Healing ◽

One Pot ◽

One Dimensional ◽

Composite Hydrogels ◽

Assembly Method

A new composite hydrogels with excellent self-healing properties was prepared by combining poly(vinyl alcohol) (PVA) and boron nitride nanofibers (BNNFs) via a facile one-pot assembly method. One-dimensional porous BNNFs with...

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Novel composite hydrogels containing fractionated, purified lignins for aqueous-based separations

Journal of Materials Chemistry A ◽

10.1039/d0ta09046h ◽

2021 ◽

Author(s):

Nicholas Gregorich ◽

Junhuan Ding ◽

Mark C. Thies ◽

Eric M. Davis

Keyword(s):

Molecular Weight ◽

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

Composite Hydrogels ◽

Hydrogel Composites

Herein, a series of novel, lignin-based hydrogel composites was fabricated by incorporating ultraclean lignins (UCLs), of controlled molecular weight and low dispersity, into poly(vinyl alcohol) (PVA).

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