Polyethylene glycol penetration into clay films: real time experiments

Baker, Scott R.; Begum, R; Zalupski, Peter R.; Durham, Malaika; Fitch, Alanah

doi:10.1016/j.colsurfa.2003.12.034

Cited by 7 publications

(7 citation statements)

References 18 publications

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“…The yielding mechanism would imply some form of flow that takes place within the fiber, possibly inter‐fibrillar slippage. Since collagen molecular and fibrillar slippage plays an important role in the tensile deformation of aligned connective tissue such as tendon, it is more likely that PEG plays a role in promoting either molecular or fibrillar slippage by “reptating” parallel to the collagen molecules backbone as has been suggested previously for PEG and collagen matrices,49 PEG and clay films,50 even hydroxyapatite nano‐crystals and collagen 51. Moreover, it has been suggested that the co‐secretion of glycosaminoglycans with collagen in living systems may be analogous to the use of PEG in in vitro systems 24, 38.…”

Section: Discussionmentioning

confidence: 82%

Extruded collagen‐polyethylene glycol fibers for tissue engineering applications

2007

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The repair of anterior cruciate ligament, skin, tendon and cartilage remains a challenging clinical problem. Extruded collagen fibers comprise a promising scaffold for tissue engineering applications; however the engineering of these fibers has still to be improved to bring this material to clinical practice. Herein we investigate the influence of collagen concentration, the amount of PEG Mw 8K and the extrusion tube internal diameter on the properties of these fibers. Ultrastructural evaluation revealed packed intra-fibrillar structure. The thermal properties were found to be independent of the collagen concentration, the amount of PEG or the extrusion tube internal diameter (p > 0.05). An inversely proportional relationship between dry fiber diameter and stress at break was found. The 20% PEG was identified as the optimal amount required for the production of reproducible fibers. Increasing the collagen concentration resulted in fibers with higher diameter (p < 0.001), force (p < 0.001) and strain at break (p < 0.02) values, whilst the stress at break (p < 0.001) and the modulus (p < 0.007) values were decreased. Increasing the extrusion tube internal diameter influence significantly (p < 0.001) all the investigated mechanical properties. Overall, extruded collagen fibers were produced with properties similar to those of native or synthetic fibers to suit a wide range of tissue engineering applications.

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Section: Discussionmentioning

confidence: 82%

Extruded collagen‐polyethylene glycol fibers for tissue engineering applications

2007

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“…Not only does PEG provide a more viscous coagulant in which diffusional exchange during the wet-spinning process can occur more slowly preventing the formation of voids within the fibres (20), but the confirmed presence of PEG in the fibres is also expected to increase the tensile strength via hydrogen bonding between the polymer and gelatin hydroxyl groups (42,68). The PEG polymer chains have previously been reported to act as a reptating agent, entangling within the chain structure and sliding parallel to gelatin chains when withstanding tensile forces (42,69).…”

Section: Tensile Propertiesmentioning

confidence: 99%

Rotation-assisted wet-spinning of UV-cured gelatin fibres and nonwovens

Rickman

Tronci

et al. 2019

J Mater Sci

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Photoinduced network formation is an attractive strategy for designing water-insoluble gelatin fibres as medical device building blocks and for enabling late-stage property customisation.However, mechanically-competent, long-lasting filaments are still hard to realise with current photoactive, e.g. methacrylated, gelatin systems due to inherent spinning instability and restricted coagulation capability. To explore this challenge, we present a multiscale approach combining the synthesis of 4-vinylbenzyl chloride (4VBC)-functionalised gelatin (Gel-4VBC) with a voltage-free spinning and UV-curing process so that biopolymer networks in the form of either individual fibres or nonwovens could be successfully manufactured. In comparison to state-of-the-art methacrylated gelatin, the mechanical properties of UV-cured Gel-4VBC fibres were readily modulated by adjustment of coagulation conditions, so that an ultimate tensile strength and strain at break of 25±4-74±3 MPa and 1.7±0.3-8.6±0.5 % were measured, respectively. The sequential functionalisation /spinning route proved to be highly scalable, so that one step spunlaid formation of fibroblast-friendly nonwoven fabrics was successfully demonstrated with wet spun Gel-4VBC fibres. The presented approach could be exploited to generate a library of gelatin building blocks tuneable from the molecular to the macroscopic level to deliver computer-controlled extrusion of fibres and nonwovens according to defined clinical applications.

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“…Analiza FTIR wykaza³a, i¿ polimer zostaje zaadsorbowany na powierzchni minera³u w czasie krótszym ni¿ 60 s, tworz¹c stabiln¹ pow³okê. Metod¹ dyfrakcji rentgenowskiej XRD stwierdzono, ¿e liniowy [34] (por. tekst) Fig.…”

Section: Poli(glikol Etylenowy)/mmtunclassified

“…7. Changes in MMT film (thin layer) structure under the influence of interaction of OEG (molecular weights 200-1500) or PEG (molecular weights 4600-10 000 g/mol) [34] (see text)…”

Section: Poli(glikol Etylenowy)/mmtmentioning

confidence: 99%

“…Przedmiotem pracy opisanej w [34] by³o wyznaczenie czasu potrzebnego na wnikniêcie oligomerów glikolu etylenowego (OEG) i PEG o ró¿nych d³ugooeciach ³añcucha (ciê¿ary cz¹steczkowe 200, 600, 1500, 4600 i 10 000 g/mol) do warstewki grubooeci 33 µm, która powsta³a w wyniku wysuszenia naniesionej na platynow¹ siatkê (150 LPI, ang. lines per inch) zawiesiny MMT (17,5 g/l) (rys.…”

Section: Poli(glikol Etylenowy)/mmtunclassified

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Hybrid hydrophilic polymer/montmorillonite systems

Drzycimska¹,

Spychaj

2008

Polimery

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Hybrydowe uk³ady typu polimer hydrofilowy/montmorylonit Streszczenie-Przedstawiono przegl¹d literatury dotycz¹cej hybrydowych uk³adów typu polimer hydrofilowy (kationowy, anionowy lub niejonowy)/montmorylonit (MMT), sposobów ich otrzymywania, metod oceny oraz kierunków zastosowania. Synteza tego typu produktów pozwala na modyfikacjê w³aoeciwooeci u¿ytkowych polimerów. Szczegó³owo scharakteryzowano zawieraj¹ce MMT ma-teria³y hybrydowe na podstawie poliakryloamidu (PAAm), kopolimerów akryloamidu, poliwinylopirolidonu (PVP), poli(kwasu akrylowego) (PAA), poli(tlenku etylenu) (PEO), oligomerów i polimerów glikolu etylenowego, a tak¿e polimeru pochodzenia naturalnego-skrobi. S³owa kluczowe: uk³ady hybrydowe, polimer hydrofilowy, montmorylonit, nanonape³niacz. HYBRID HYDROPHILIC POLYMER / MONTMORILLONITE SYSTEMS Summary-A literature review on hybrid systems consisted of hydrophilic polymer (cationic, anionic or nonionic one) and montmorillonite (MMT, Fig. 1 and 2) is presented. The methods of preparation, evaluation and applications directions are discussed. Preparation of such products let modify the functional properties of polymers. The hybrid systems based on polyacrylamide (PAAm) (Fig. 3-5), acrylamide copolymers, polyvinylpyrrolidone (PVP), poly(acrylic acid) (PAA) (Fig. 6), poly(ethylene oxide) (PEO), oligomers or polymers of ethylene glycol (Fig. 7) or polymer of natural origin-starch, containing montmorillonite were characterized in detail.

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Polyethylene glycol penetration into clay films: real time experiments

Cited by 7 publications

References 18 publications

Extruded collagen‐polyethylene glycol fibers for tissue engineering applications

Extruded collagen‐polyethylene glycol fibers for tissue engineering applications

Rotation-assisted wet-spinning of UV-cured gelatin fibres and nonwovens

Hybrid hydrophilic polymer/montmorillonite systems

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