The characterization of dressing component materials and radiation formation of PVA–PVP hydrogel

Razzak, Mirzan T.; Zainuddin, Zainuddin -; Erizal,; Dewi, Shinta; Lely, H.; Taty, E.; Sukirno,

doi:10.1016/s0969-806x(98)00320-x

Cited by 116 publications

(54 citation statements)

References 5 publications

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“…7, for PVP/TA flake and the centrifugally spun fibres generated two dominant peaks superimposed onto a broad and weak halo that stretches from 10°to 30°2h. This broad shoulder is indicative of an amorphous region [31] and it has been demonstrated previously that homogenous PVP exhibits low levels of order in XRD analyses indicating that PVP is entirely amorphous [32,33]. However, the distinct peaks evident in the XRD patterns for PVP/TA fibres are a strong indicator of long range order and therefore semi-crystallinity.…”

Section: Internal Fine Structure and Thermal Analyses Of Fibresmentioning

confidence: 64%

Centrifugal melt spinning of polyvinylpyrrolidone (PVP)/triacontene copolymer fibres

2016

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Polyvinylpyrrolidone/1-triacontene (PVP/TA) copolymer fibre webs produced by centrifugal melt spinning were studied to determine the influence of jet rotation speed on morphology and internal structure as well as their potential utility as adsorbent capture media for disperse dye effluents. Fibres were produced at 72°C with jet head rotation speeds from 7000 to 15,000 r min -1 . The fibres were characterised by means of SEM, XRD and DSC. Adsorption behaviour was investigated by means of an isothermal bottle point adsorption study using a commercial disperse dye, Dianix AC-E. Through centrifugal spinning nanofibers and microfibers could be produced with individual fibres as fine as 200-300 nm and mean fibre diameters of ca. 1-2 lm. The PVP/TA fibres were mechanically brittle with characteristic brittle tensile fracture regions observed at the fibre ends. DSC and XRD analyses suggested that this brittleness was linked to the graft chain crystallisation where the PVP/TA was in the form of a radial brush copolymer. In this structure, the triacontene branches interlock and form small lateral crystals around an amorphous backbone. As an adsorbent, the PVP/TA fibres were found to adsorb 35.4 mg g -1 compared to a benchmark figure of 30.0 mg g -1 for a granular-activated carbon adsorbent under the same application conditions. PVP/TA is highly hydrophobic and adsorbs disperse dyes through the strong ''hydrophobic bonding'' interaction. Such fibrous assemblies may have applications in the targeted adsorption and separation of non-polar species from aqueous or polar environments.

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Section: Internal Fine Structure and Thermal Analyses Of Fibresmentioning

confidence: 64%

Centrifugal melt spinning of polyvinylpyrrolidone (PVP)/triacontene copolymer fibres

2016

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“…The copolymerization of such high hydrophilic polymer (PVA) with hydrophilic glass forming monomer (HEMA) changed the properties of the polymer matrix to be a more suitable porous and swelling gel, this retard the leakage of the enzyme from the hydrogel, In addition, the grafting of PVA with PVP remained the polymer very fragile and with a more porous structure, more water content and then increase the enzyme leakage from the hydrogel. On the contrast, the use of poly (PVA) hydrogel make a polymer matrix had a porous structure of small porosity, then hindrance the interaction between the enzyme and the substrate (Razzak et al,1999;Darwis et al, 2002; Abd El-Hadi and Abd El-Rehim, 2004). Changing the radiation dose produces a pronounced effect on the swelling properties of the polymers.…”

Section: Effect Of Different Copolymer Hydrogels On Immobilization Yieldmentioning

confidence: 99%

Immobilization of Mucor racemosus NRRL 3631 lipase with different polymer carriers produced by radiation polymerization

Mostafa¹,

El-Hadi²

2010

MJM

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Lipase was partially purified from the culture supernatant of Mucor racemosus NRRL 3631. In an attempt to increase the enzyme stability, the enzyme was immobilized on poly (vinyl alcohol) PVA, radiation cross liked poly (vinyl alcohol/ vinyl pyrrolidone) PVA / PVP and poly (vinyl alcohol/ hydroxyethylmethacrylate) PVA/ HEMA hydrogels. The maximum immobilization yield (31.74 %) was obtained using PVA/ HEMA copolymer. The effect of the immobilization parameters on the enzyme such as the hydrogel composition, irradiation dose and the immobilization technique was performed. An optimum radiation dose of 15 kGy and hydrogel composition of 10 % PVA/ HEMA (9.6: 0.4 v/v) increased the immobilization yield to 60.3 %. Diffusion phenomena can be markedly increased the enzyme immobilization on the surface of the hydrogel. In this case the retained activity was approximately 81.5 % of that of the free enzyme. The profiles of immobilized enzyme activities at various pH values (4-9) and temperatures (30-80 °C) showed an overall higher stability for the immobilized enzyme than that for the free one. The half life values of the immobilized and free enzymes at 60 °C were 3.3 h and 1.73 h, respectively. The immobilized enzyme retained 69.2 % of its initial activity after three cycles.

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“…Samples were irradiated with various doses ranging from 2 to 250 kGy (2,4,6,8,10, 50, 100, 150, 200, 250 kGy). The average irradiation dose rate was 3.5 kGy/h.…”

Section: Gamma Irradiationmentioning

confidence: 99%

“…Hydrogels show excellent biocompatibility and can be used for many medical applications such as wound dressing, controlled release of drugs, enzyme supports, etc. 3,4 An effective route to design mechanically strong polymeric matrices has been through the preparation of interpenetrating polymer networks (IPNs), which are defined as a physical mixture of at least two polymers that have been synthesized or crosslinked in the presence of the other with no significant degree of covalent bonds between them. 5 The literature richly documents various polymer blends or IPNs, which have been undertaken for study of mechanical properties such as hardness.…”

Section: Introductionmentioning

confidence: 99%

Effect of gamma irradiation on the interpenetrating networks of gelatin and polyacrylonitrile: Aspect of crosslinking using microhardness and crosslink density measurements

Rajvaidya

Bajpai

Bajpai³

2006

J of Applied Polymer Sci

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ABSTRACT:The present article reports the effect of gamma irradiation on the hardness behavior of the interpenetrating polymer networks (IPNs) of gelatin and polyacrylonitrile (PAN). Various compositions of gluteraldehydecrosslinked gelatin and N, NЈ-methylene bis acrylamide (MBA)-crosslinked PAN were prepared and investigated for microhardness studies. The pre-and post-irradiated IPNs were characterized for their crosslinking density, determined with swelling ratio measurements. It was found that the crosslinked IPNs get further hardened because of radiational hardening at specific doses in the range from 2 to 250 kGy. The role of acrylonitrile and crosslinker (MBA) in the IPNs, as a consequence of irradiation, has also been explained. A fair consistency has been observed between the microhardness results and crosslinking density measurements.

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The characterization of dressing component materials and radiation formation of PVA–PVP hydrogel

Cited by 116 publications

References 5 publications

Centrifugal melt spinning of polyvinylpyrrolidone (PVP)/triacontene copolymer fibres

Centrifugal melt spinning of polyvinylpyrrolidone (PVP)/triacontene copolymer fibres

Immobilization of Mucor racemosus NRRL 3631 lipase with different polymer carriers produced by radiation polymerization

Effect of gamma irradiation on the interpenetrating networks of gelatin and polyacrylonitrile: Aspect of crosslinking using microhardness and crosslink density measurements

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