PVA containing chito-oligosaccharide side chain

Cho, Yong-Woo; Han, Seung-Soo; Ko, Seung Whan

doi:10.1016/s0032-3861(99)00351-1

Cited by 46 publications

(21 citation statements)

References 29 publications

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“…The depression of the melting temperature is caused by the morphological effects induced by the reaction between GA and PVA. 20 Two kinds of reactions can occur-the crosslinking and the branching via grafting of the GA molecules. Both attenuate the hydrogen bonding and the degree of crystallinity.…”

Section: Dsc Analysismentioning

confidence: 99%

On the viscoelastic properties of poly(vinyl alcohol) and chemically crosslinked poly(vinyl alcohol)

Park

Ruckenstein

2001

J of Applied Polymer Sci

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Poly(vinyl alcohol)(PVA) films chemically crosslinked with glutaraldehyde(GA) in the presence of HCl were prepared by casting from aqueous solutions. The PVA and PVA gels were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA); their swelling characteristics and tensile strength were also determined. The DSC results for the gels displayed depressions of the melting and crystallization temperatures, as well as a decrease of the heat of fusion, when compared to those of PVA free of crosslinker. The DMA analysis revealed that: (1) The glass transition temperature of the wet PVA was lower than that of the dry one, indicating that the water had a plasticizing effect.(2) The gels had a lower glass transition temperature than PVA. (3) The glass transition temperature of the wet gels increased with increasing crosslink density. Possible explanations are provided for these observations. Whereas the thermogravimetric curves of PVA exhibited a single degradation peak, two degradation peaks were detected for the crosslinked PVA. The wet PVA and PVA gels displayed lower tensile strengths and higher elongations than the dried ones.

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Section: Dsc Analysismentioning

confidence: 99%

On the viscoelastic properties of poly(vinyl alcohol) and chemically crosslinked poly(vinyl alcohol)

Park

Ruckenstein

2001

J of Applied Polymer Sci

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“…In particular, chitosan blended with PVA has been reported to have good mechanical and chemical properties and, as a topic of great interest, has been extensively studied in the biomedical field. [38][39][40] The enhanced property has been attributed to the interactions between chitosan and PVA in the blend through hydrophobic side-chain aggregation and intermolecular and intra-molecular hydrogen bonds 41,42 as shown in Figure 1.…”

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confidence: 99%

Synthesis and characterization of electrospun polyvinyl alcohol nanofibrous scaffolds modified by blending with chitosan for neural tissue engineering

Alhosseini¹,

Moztarzadeh²,

Mozafari³

et al. 2012

IJN

124

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Among several attempts to integrate tissue engineering concepts into strategies to repair different parts of the human body, neuronal repair stands as a challenging area due to the complexity of the structure and function of the nervous system and the low efficiency of conventional repair approaches. Herein, electrospun polyvinyl alcohol (PVA)/chitosan nano-fibrous scaffolds have been synthesized with large pore sizes as potential matrices for nervous tissue engineering and repair. PVA fibers were modified through blending with chitosan and porosity of scaffolds was measured at various levels of their depth through an image analysis method. In addition, the structural, physicochemical, biodegradability, and swelling of the chitosan nanofibrous scaffolds were evaluated. The chitosan-containing scaffolds were used for in vitro cell culture in contact with PC12 nerve cells, and they were found to exhibit the most balanced properties to meet the basic required specifications for nerve cells. It could be concluded that addition of chitosan to the PVA scaffolds enhances viability and proliferation of nerve cells, which increases the biocompatibility of the scaffolds. In fact, addition of a small percentage of chitosan to the PVA scaffolds proved to be a promising approach for synthesis of a neural-friendly polymeric blend.

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“…Another peak appeared at 168.85 ppm was due to the carbonyl carbon. Cho et al studied 13 C NMR spectrum of chito‐oligosaccharide (COS) side chain containing NMA and reported the presence of its characteristic peaks [26].…”

Section: Resultsmentioning

confidence: 99%

Effect of different crosslinkers on properties of melamine formaldehyde‐furfuryl alcohol copolymer/montmorillonite impregnated softwood (Ficus hispida)

Hazarika

Maji

2012

Polymer Engineering & Sci

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Melamine formaldehyde‐furfuryl alcohol (MFFA) copolymer was prepared and impregnated into softwood Ficus hispida in combination with crosslinking agent and montmorillonite (MMT) under vacuum condition. Different crosslinkers namely n‐methylol acrylamide, (NMA), 2‐hydroxyethyl methacrylate (HEMA) and 1,3‐dimethylol‐4,5‐dihydroxyethyleneurea (DMDHEU) were used for evaluation of properties of the prepared composites. Nuclear magnetic resonance (NMR) and fourier transform infrared spectroscopy (FTIR) studies confirmed the formation of MFFA copolymer, NMA, and DMDHEU crosslinkers. X‐ray diffractometry (XRD) and FTIR studies were used to characterize the nanocomposites. The incorporation of MMT decreased the crystallinity of wood composites as revealed by XRD study. Maximum interaction was found in wood samples treated with MFFA/(NMA+HEMA+DMDHEU)/MMT as shown by FTIR study. The incorporation of MMT into the wood polymer composite was revealed by transmission electron microscopy study. Thermal stability and flammability were checked by thermogravimetric analyzer and limiting oxygen index instrument. Wood treated with MFFA, blended crosslinker and MMT exhibited higher dimensional stability, lower water uptake (%), enhanced chemical resistance, and better mechanical properties (flexural, tensile, and hardness). SEM study indicated the presence of polymer and MMT in the void spaces of wood. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

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PVA containing chito-oligosaccharide side chain

Cited by 46 publications

References 29 publications

On the viscoelastic properties of poly(vinyl alcohol) and chemically crosslinked poly(vinyl alcohol)

On the viscoelastic properties of poly(vinyl alcohol) and chemically crosslinked poly(vinyl alcohol)

Synthesis and characterization of electrospun polyvinyl alcohol nanofibrous scaffolds modified by blending with chitosan for neural tissue engineering

Effect of different crosslinkers on properties of melamine formaldehyde‐furfuryl alcohol copolymer/montmorillonite impregnated softwood (Ficus hispida)

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