Disulfide group influence on the surface properties and reversible cross-linking functionalization of natural polymer coating

2020 ◽  
Author(s):  
Hanyu Xue ◽  
Xiaohong Ding ◽  
Yuchi Zhang ◽  
Xinzhong Li ◽  
Jianrong Xia ◽  
...  
Keyword(s):  
Surface Properties ◽  
Polymer Coating ◽  
Cross Linking ◽  
Natural Polymer ◽  
Group Influence ◽  
Disulfide Group

scholarly journals Evaluation of physicochemical and mechanical properties of polymeric formulations for use in the oral cavity

2013 ◽  
Vol 26 (3) ◽  
pp. 252-257
Keyword(s):  
Mechanical Properties ◽  
Oral Cavity ◽  
Mechanical Characteristics ◽  
Cross Linking ◽  
Distilled Water ◽  
Natural Polymer ◽  
Dental Implantation ◽  
Microcrystalline Chitosan ◽  
Medicinal Substances ◽  
Main Material

The aim of this research was to create and investigate a formulation that could be placed within post-extraction alveolus. The main material used in this work is a natural polymer, known as microcrystalline chitosan (MCCh). It was formulated as an aqueous hydrogel with the addition of the cross-linking agent (CaCl2) and various plasticizers (propylene glycol, glycerol and sorbitol). The swelling of the preparations was tested by three different methods under completely different acceptor fluids such as distilled water, phosphate buffer and simulated saliva. The pH was measured on the surfaces of each formulation, as well as the pH of the acceptor fluids; evidently, both of them had a similar pH to that of the oral cavity. Additionally, mechanical properties of the tested materials such as hardness, springiness and cohesiveness were evaluated. Based on research, the best compositions of materials were chosen to obtain preparations of the desired geometry and mechanical characteristics. The results from the study are able to prove that MCCh not only creates a neutral environment within the oral cavity but also, due to its significant absorptive properties, can reduce exu date and po ten tially be considered as a new carrier for medicinal substances used in dental implantation and management.

Chitosan sponge matrices with β-cyclodextrin for berberine loadinging

2016 ◽  
Vol 70 (9) ◽  
Author(s):  
Mária Hnátová ◽  
Dušan Bakoš ◽  
L’udmila Černáková ◽  
Monika Michliková
Keyword(s):  
Inclusion Complex ◽  
Water Solution ◽  
Porous Matrix ◽  
Cross Linking ◽  
Natural Polymer ◽  
Dialdehyde Starch ◽  
Subsequent Formation ◽  
Simple Addition ◽  
Natural Substances ◽  
Sponge Matrix

AbstractBiocompatible polymer sponge materials based on biodegradable natural polymer chitosan, which can be loaded with clinician-selected drugs are still in the centre of interest for their wide use in clinical practice. This study shows possibilities of the technology which combines simple addition of β-cyclodextrin (β-CD), with dialdehyde starch (DAS) as a cross-linking agent of chitosan, to chitosan solutions for subsequent formation of sponge matrix. The advantage of such system is in avoiding chemical modifications and working only with natural substances. It is shown that, in matrix formation during lyophilisation, β-CD molecules tend to accumulate on the surface of the porous matrix structure. This was confirmed by a study of the known inclusion complex of β-CD and salicylic acid (SA) in heptane. The same study was applied to berberine (BER) which can also form an inclusion complex with β-CD in a water solution. Moreover, adsorption of drugs on the surface of the porous structure has to be also taken into account. This enables the production of sponge topical medical preparations useful for sustained release of BER.

scholarly journals A new surface coating designed to improve comfort for made-to-measure GP contact lenses

The Eye ◽  
2019 ◽  
Vol 126 (2019-2) ◽  
pp. 52-58
Author(s):  
Martin Conway
Keyword(s):  
Surface Properties ◽  
Contact Lens ◽  
Surface Coating ◽  
Polymer Coating ◽  
Contact Lenses ◽  
Tear Film ◽  
Deposit Formation ◽  
Dry Eyes ◽  
Optimum Range ◽  
Design And Manufacturing

Design and manufacturing of material for contact lens¬es require a balance of functionality and comfort that cannot achieved in all contact lenses. Tangible Hydra-PEG™ technology helps improve the surface properties of contact lenses of any type, including customized lenses made from any material. Tangible Hydra-PEG™ is a polymer coating; it contains 90% water, which ensures maintenance of the tear film, improve¬ment of wettability and lubricating, as well as resistance to the deposit formation, and therefore can be especially helpful to users of rigid gas-permeable contact lenses, which are worried about dry eyes or general discomfort. According to conducted studies, 69% users sur¬veyed preferred lenses coated with Tangible Hydra-PEG™ to conventional lenses due to a higher level of comfort. This technology has been approved by the FDA. Currently, the products of the Optimum range by «Con¬tamac» company are available with innovative Tangible Hydra-PEG™ coating: Optimum Classic (Dk 26), Comfort (Dk 65), Extra (Dk 100) и Extreme (Dk 125).

scholarly journals Synthesis, characterization, surface properties and energy device characterstics of 2D borocarbonitrides, (BN)xC1−x, covalently cross-linked with sheets of other 2D materials

RSC Advances ◽  
2018 ◽  
Vol 8 (31) ◽  
pp. 17237-17253 ◽  
Author(s):  
Navin Kumar Singh ◽  
K. Pramoda ◽  
K. Gopalakrishnan ◽  
C. N. R. Rao
Keyword(s):  
Surface Properties ◽  
2D Materials ◽  
Cross Linking ◽  
Coupling Reactions ◽  
Energy Device ◽  
Novel Materials

Covalent cross-linking of 2D structures such as graphene, MoS2 and C3N4 using coupling reactions affords the generation of novel materials with new or improved properties.

scholarly journals SYNTHESIS AND STABILIZATION OF COPPER NANOPARTICLES IN GUM ARABIC CONDITIONS

InterConf ◽  
2021 ◽  
pp. 214-217
Author(s):  
Nizami Zeynalov ◽  
Ulviya Mammadova ◽  
Nargiz Rahimli ◽  
Konul Hasanova ◽  
Hecer Aslanova ◽  
...  
Keyword(s):  
Composite Material ◽  
Metal Nanoparticles ◽  
Copper Nanoparticles ◽  
Gum Arabic ◽  
Cross Linking ◽  
Natural Polymer ◽  
Copper Metal

Copper metal nanoparticles are immobilized in a natural polymer gum arabic. The resulting compound was constructed using cross-linking agent of glutar aldehyde. The composite material was studied by the FTIR method.

Surface Properties of Crosslinking Polyamide Measured by Micro-Indentation Test

2018 ◽  
Vol 919 ◽  
pp. 111-119
Author(s):  
Martin Ovsik ◽  
Michal Stanek ◽  
Vojtech Senkerik
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Surface Properties ◽  
Electron Beam Irradiation ◽  
Indentation Test ◽  
Polymer Chains ◽  
Beta Radiation ◽  
Cross Linking ◽  
Micro Indentation ◽  
Different Doses

Cross-linking is a process in which polymer chains are associated through chemical bonds. Radiation, which penetrated through specimens and reacted with the cross-linking agent, gradually formed cross-linking (3D net), first in the surface layer and then in the total volume, which resulted in considerable changes in specimen behavior. This paper studies the effect of different doses of ionizing beta radiation on the micro-mechanical properties of commercially available polyamide. The measured results indicate, that electron beam irradiation is very effective tool for improvement of surface properties of PA6. In terms of micro-mechanical properties, the values of micro-hardness of surface layer increased by 24% at radiation dose of 132 kGy, stiffness of surface micro layer by 26% (132 kGy) as a result of different loads (0.5N and 2N). Improvement of micro-mechanical properties of radiated polyamide has a great significance also for industry. The modified polyamide shifts to the group of materials that have considerably better properties. Its micro-mechanical properties make polyamide ideal for a wide application in areas where higher resistance to wear, creep are required. Commonly manufactured PA6 can hardly fulfil these criteria.

Effect of cross-linking in surface properties and antioxidant activity of gelatin films incorporated with a curcumin derivative

2017 ◽  
Vol 66 ◽  
pp. 168-175 ◽  
Author(s):  
Alaitz Etxabide ◽  
Verónique Coma ◽  
Pedro Guerrero ◽  
Christian Gardrat ◽  
Koro de la Caba
Keyword(s):  
Antioxidant Activity ◽  
Surface Properties ◽  
Cross Linking ◽  
Gelatin Films ◽  
Curcumin Derivative

scholarly journals Past and Current Progress in the Development of Antiviral/Antimicrobial Polymer Coating towards COVID-19 Prevention: A Review

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4234
Author(s):  
Nazihah Nasri ◽  
Arjulizan Rusli ◽  
Naozumi Teramoto ◽  
Mariatti Jaafar ◽  
Ku Marsilla Ku Ishak ◽  
...  
Keyword(s):  
Surface Modification ◽  
Surface Properties ◽  
Polymer Coating ◽  
Infected Individual ◽  
Virus Transmission ◽  
Surface Coatings ◽  
Action Mode ◽  
Bacterial Transmission ◽  
Functional Nanomaterial ◽  
Coating Agents

The astonishing outbreak of SARS-CoV-2 coronavirus, known as COVID-19, has attracted numerous research interests, particularly regarding fabricating antimicrobial surface coatings. This initiative is aimed at overcoming and minimizing viral and bacterial transmission to the human. When contaminated droplets from an infected individual land onto common surfaces, SARS-CoV-2 coronavirus is able to survive on various surfaces for up to 9 days. Thus, the possibility of virus transmission increases after touching or being in contact with contaminated surfaces. Herein, we aim to provide overviews of various types of antiviral and antimicrobial coating agents, such as antimicrobial polymer-based coating, metal-based coating, functional nanomaterial, and nanocomposite-based coating. The action mode for each type of antimicrobial agent against pathogens is elaborated. In addition, surface properties of the designed antiviral and antimicrobial polymer coating with their influencing factors are discussed in this review. This paper also exhibits several techniques on surface modification to improve surface properties. Various developed research on the development of antiviral/antimicrobial polymer coating to curb the COVID-19 pandemic are also presented in this review.

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