RETRACTED: A Bio Polymeric Adhesive Produced by Photo Cross-Linkable Technique

Abdalla, S.; Al-Aama, N; Al-Ghamdi, Maryam A.

doi:10.3390/polym8080292

Cited by 11 publications

(8 citation statements)

References 39 publications

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“…This trend was clearly confirmed via SEM, whereby the average fibre diameter was more than doubled in water-incubated with respect to dry samples (d: 1.3 ±0.2 à 2.9 ± 0.4 µm), whilst nearly no fibre could be retained by either corresponding electrospun sample F-G5P2 or UV-cured samples F-G30 H . These results confirm that the UV-induced crosslinking reaction successfully enables controlled swelling of resulting fibres due to the synthesis of the covalent gelatin/PCL co-network [108]. Fig.…”

Section: Water Holding Capacitysupporting

confidence: 79%

A UV-cured nanofibrous membrane of vinylbenzylated gelatin-poly(ɛ-caprolactone) dimethacrylate co-network by scalable free surface electrospinning

Bazbouz

Tronci

2018

Materials Science and Engineering: C

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Electrospun nanofibrous membranes of natural polymers, such as gelatin, are fundamental in the design of regenerative devices. Crosslinking of electrospun fibres from gelatin is required to prevent dissolution in water, to retain the original nanofibre morphology after immersion in water, and to improve the thermal and mechanical properties, although this is still challenging to accomplish in a controlled fashion. In this study, we have investigated the scalable manufacture and structural stability in aqueous environment of a UV-cured nanofibrous membrane fabricated by free surface electrospinning (FSES) of aqueous solutions containing vinylbenzylated gelatin and poly(ɛ-caprolactone) dimethacrylate (PCL-DMA). Vinylbenzylated gelatin was obtained via chemical functionalisation with photopolymerisable 4-vinylbenzyl chloride (4VBC) groups, so that the gelatin and PCL phase in electrospun fibres were integrated in a covalent UV-cured co-network at the molecular scale, rather than being simply physically mixed. Aqueous solutions of acetic acid (90 vol%) were employed at room temperature to dissolve gelatin-4VBC (G-4VBC) and PCL-DMA with two molar ratios between 4VBC and DMA functions, whilst viscosity, surface tension and electrical conductivity of resulting electrospinning solutions were characterised. Following successful FSES, electrospun nanofibrous samples were UV-cured using Irgacure I2959 as radical photo-initiator and 1-Heptanol as water-immiscible photo-initiator carrier, resulting in the formation of a water-insoluble, gelatin/PCL covalent co-network. Scanning electron microscopy (SEM), attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, differential scanning calorimetry (DSC), tensile test, as well as liquid contact angle and swelling measurements were carried out to explore the surface morphology, chemical composition, thermal and mechanical properties, wettability and water holding capacity of the nanofibrous membranes, respectively. UV-cured nanofibrous membranes did not dissolve in water and showed enhanced thermal and mechanical properties, with respect to as-spun samples, indicating the effectiveness of the photo-crosslinking reaction. In addition, UV-cured gelatin/PCL membranes displayed increased structural stability in water with respect to PCL-free samples and were highly tolerated by G292 osteosarcoma cells. These results therefore support the use of PCL-DMA as hydrophobic, biodegradable crosslinker and provide new insight on the scalable design of water-insoluble, mechanical-competent gelatin membranes for healthcare applications.

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Section: Water Holding Capacitysupporting

confidence: 79%

A UV-cured nanofibrous membrane of vinylbenzylated gelatin-poly(ɛ-caprolactone) dimethacrylate co-network by scalable free surface electrospinning

Bazbouz

Tronci

2018

Materials Science and Engineering: C

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“…This technique is particularly useful in biocompatible adhesives and tissue engineering, where a quick curing step is required, despite the need for oxygen inhibition in order to avoid likely side reactions, quite achievable by modifying the radiation intensity and initiator concentration [178]. Thus, Liu et al [165] intended to avoid attachment of microorganisms to WPU coatings by embedding lysozyme into the polyurethane backbone via photopolymerization, while Abdalla et al [179] effectively prepared homogeneous biocompatible adhesives based on polycaprolactone and 2-isocyantoethylmethacrylate in just 60 s. Such UV-light susceptible isocyanates have also been applied in other studies [180,181] pointing out that UV-induced radically polymerizable functional groups can be found not only in additional monomers but also in the isocyanate source.…”

Section: Radiation Curable Polyurethanesmentioning

confidence: 99%

“…Finally, bearing in mind the likely reaction between free isocyanates with amine groups located in the proteins, the polyurethane adhesive field has also spread to the biomedical area, requiring quick curing process and biocompatible building blocks to be applied as bioadhesives in living tissues [49,227,248]. In response to the growing need for the rapid curing process, photo-crosslinkable technique emerges to satisfy such requirements [180], enabling the reduction of the curing times until one minute as Abdalla et al [179] pointed out, obtaining morphologically homogeneous and biocompatible photo-crosslinkable biomedical polyurethane adhesives from polycaprolactone-diol and 2-isocyanatoethylmethacrylate.…”

Section: Latest Advances In Bio-based Polyurethane Adhesivesmentioning

confidence: 99%

A Review of the Sustainable Approaches in the Production of Bio-based Polyurethanes and Their Applications in the Adhesive Field

2020

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On account of the irreversible environmental damage caused by the utilization of non-renewable raw materials in industrial production, since the end of the twentieth century, the interest in replacing the traditionally applied petroleum-based starting compounds in the polyurethane production by more sustainable feedstocks has grown enormously. Such pursuit of Green Chemistry has been fostered by the implementation of a set of national and international initiatives and stricter regulations, especially in the field of adhesives. In this respect, the latest advances in the production of bio-based polyurethanes are collected in this review. Thus, after a brief introduction to this subject and main tendencies towards the production of more sustainable polyurethanes, the first section reviews the feasibility of manufacturing polyurethanes from a range of natural platforms, including lignocellulosic biomass and vegetable oils, whether modified or in their original form, along with some industrial wastes. Afterwards, the hitherto considered synthetic routes for the preparation of greener polyurethanes are assessed, encompassing waterborne, radiation-curable and non-isocyanate polyurethane techniques. Finally, the last section focuses on the research advancement on the synthesis, properties and different uses of bio-based polyurethanes specifically implemented in the field of adhesives.

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“…Since their discovery by Otto Bayer and co-workers in 1937 [11], polyurethanes have become one of the most outstanding polymers as they exhibit a high performance and versatility, being employed in a vast range of industrial and engineering applications such as foams [12,13], coatings [14], medicinal products [15,16] or adhesives [17], among others. This wide variety of applications is associated to their superior properties, including excellent corrosion, solvent and chemical resistance, high mechanical strength, low temperature flexibility, adhesion, suitable curing rates, chemical structure versatility, etc.…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization and Mechanical Properties of Bio-Based Polyurethane Adhesives from Isocyanate-Functionalized Cellulose Acetate and Castor Oil for Bonding Wood

2017

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Nowadays, different types of natural carbohydrates such as sugars, starch, cellulose and their derivatives are widely used as renewable raw materials. Vegetable oils are also considered as promising raw materials to be used in the synthesis of high quality products in different applications, including in the adhesive field. According to this, several bio-based formulations with adhesion properties were synthesized first by inducing the functionalization of cellulose acetate with 1,6-hexamethylene diisocyanate and then mixing the resulting biopolymer with a variable amount of castor oil, from 20% to 70% (wt). These bio-based adhesives were mechanically characterized by means of small-amplitude oscillatory torsion measurements, at different temperatures, and standardized tests to evaluate tension loading (ASTM-D906) and peel strength (ASTM-D903). In addition, thermal properties and stability of the synthesized bio-polyurethane formulations were also analyzed through differential scanning calorimetry and thermal gravimetric analysis. As a result, the performance of these bio-polyurethane products as wood adhesives were compared and analyzed. Bio-polyurethane formulations exhibited a simple thermo-rheological behavior below a critical temperature of around 80-100 • C depending on the castor oil/cellulose acetate weight ratio. Formulation with medium castor oil/biopolymer weight ratio (50:50 % wt) showed the most suitable mechanical properties and adhesion performance for bonding wood.

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RETRACTED: A Bio Polymeric Adhesive Produced by Photo Cross-Linkable Technique

Cited by 11 publications

References 39 publications

A UV-cured nanofibrous membrane of vinylbenzylated gelatin-poly(ɛ-caprolactone) dimethacrylate co-network by scalable free surface electrospinning

A UV-cured nanofibrous membrane of vinylbenzylated gelatin-poly(ɛ-caprolactone) dimethacrylate co-network by scalable free surface electrospinning

A Review of the Sustainable Approaches in the Production of Bio-based Polyurethanes and Their Applications in the Adhesive Field

Preparation, Characterization and Mechanical Properties of Bio-Based Polyurethane Adhesives from Isocyanate-Functionalized Cellulose Acetate and Castor Oil for Bonding Wood

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