scholarly journals Insights into Adsorption Characterization of Sulfated Xylans onto Poly(ethylene terephthalate)

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 825 ◽  
Author(s):  
Lidija Fras Zemljič ◽  
Nena Dimitrušev ◽  
Rok Zaplotnik ◽  
Simona Strnad
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ethylene Terephthalate ◽  
Research Field ◽  
Polymer Composite Material ◽  
Coulomb Interactions ◽  
Poly Ethylene Terephthalate ◽  
Physical Interactions ◽  
Poly Ethylene ◽  
Repulsive Forces ◽  
Adsorption Desorption

The main aim of this investigation was to study the interaction of sulfated xylans as antithrombotic substances with poly(ethylene terephthalate) (PET) model films as a model for blood contacting surfaces. The adsorption of sulfated xylans onto PET model films was studied as a function of pH and ionic strength using the quartz crystal microbalance with dissipation (QCM-D) technique. The application of positively charged polyethyleneimine (PEI) as an anchoring polymer was done to improve the adsorption. The hydrophilic/hydrophobic properties of functionalized PET surfaces were monitored by goniometry, whilst their elemental composition was determined by X-ray photoelectron spectroscopy. Sulfated xylans adsorbed favorably at pH 5 by physical interactions and by entropy gain driven adsorption. Higher ionic strengths of solutions improved adsorption, due to the reduction of electrostatic repulsive forces between PET surfaces and anionic xylans’ macromolecules. The intermediate PEI layer caused more extensive and stable adsorption due to Coulomb interactions. The surface modifications presented in this work provided important information regarding the adsorption/desorption phenomena between antithrombotic sulfated xylans and PET surfaces. The latter is of great interest when preparing advanced polymer composite material such as functional antithrombotic PET surfaces for blood-contacting medical devices and presents an extremely challenging research field.

Functionalisation of poly(ethylene terephthalate) (PET) surfaces with two cationised xylans by means of two anchoring polymers

Holzforschung ◽  
2019 ◽  
Vol 73 (7) ◽  
pp. 695-704 ◽  
Author(s):  
Lidija Fras Zemljič ◽  
Nena Dimitrušev ◽  
Bodo Saake ◽  
Simona Strnad
Keyword(s):  
Ethylene Terephthalate ◽  
Free Energies ◽  
Antimicrobial Substances ◽  
Intermediate Layers ◽  
Poly Ethylene Terephthalate ◽  
Coating Durability ◽  
Physical Interactions ◽  
Poly Ethylene ◽  
Adsorption Desorption ◽  
Positively Charged

Abstract The main aim of this investigation was to study the interaction of cationised xylans as antimicrobial substances with poly(ethylene terephthalate) (PET) model films, prepared by spin coating. A quartz crystal microbalance (QCM-D) with dissipation monitoring was applied as a nanogram sensitive balance to detect the amount of adsorbed cationised xylans. The xylan adsorption onto PET model films was studied as a function of pH and ionic strength. To improve the adsorption, positively charged polyethylenimid (PEI) and negatively charged polyvinyl-sulfonic acid (PVSA), as sodium salt, were applied as anchoring polymers. Surface free energies and hydrophilic/hydrophobic properties of surfaces were monitored by goniometry. Cationised xylans favourably deposited at pH 5, where beside electrostatic, physical interactions are possible, and adsorption may be driven by entropy gain. Higher ionic strengths of solutions also improved adsorption, due to the lower water solubilities of xylans. When intermediate layers of chosen anchoring polymers were applied on the PET surfaces, the binding of xylans as well as their coating durability were improved. Surface modifications presented in this work, provided important information regarding the adsorption/desorption phenomena between antimicrobial cationised xylans and synthetic PET surfaces. The latter is of great interest, when composing hydrophilic and antimicrobial PET surfaces for medical applications.

Surface Characterization and In Vitro Blood Compatibility of Poly(Ethylene Terephthalate) Immobilized with Hirudin

2005 ◽  
Vol 288-289 ◽  
pp. 421-424
Author(s):  
F. Li ◽  
Jin Wang ◽  
H. Sun ◽  
Nan Huang
Keyword(s):  
Free Energy ◽  
Photoelectron Spectroscopy ◽  
Surface Characterization ◽  
Ethylene Terephthalate ◽  
Blood Compatibility ◽  
Argon Plasma ◽  
Angle Measurement ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Poly(ethylene terephthalate) films were exposed under argon plasma glow discharge and induced polymerization of acrylic acid (AA) in order to introduce carboxylic acid group onto PET (PET-AA) assisting by ultroviolet radiation. Hirudin-immobilized PETs were prepared by the grafting of PET-AA, followed by chemical reaction with hirudin. The surface structure of the treated PET is determined by X-ray photoelectron spectroscopy (XPS). The wettability and surface free energy, interface free energy of the films is investigated by contact angle measurement. Platelet adhesion evaluatiion is conducted to examine the blood compatibility in vitro. Scanning electron microscopy (SEM) and optical microscopy reveal that the amounts of adhered, aggregated and morphologically changed platelets are reduced on hirudin-immobilized PET films.

scholarly journals Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilization

2013 ◽  
Vol 11 (11) ◽  
pp. 1786-1798 ◽  
Author(s):  
Mioara Drobota ◽  
Zdenka Persin ◽  
Lidija Zemljic ◽  
Tamiselvan Mohan ◽  
Karin Stana-Kleinschek ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ethylene Terephthalate ◽  
Chemical Properties ◽  
Surface Films ◽  
Wetting Properties ◽  
Poly Ethylene Terephthalate ◽  
Total Reflexion ◽  
Poly Ethylene ◽  
Collagen Immobilization ◽  
Pet Films

AbstractThe functionalization of poly(ethylene terephthalate) (PET) surface films by reactions with multifunctional amines such as triethylenetetramine (TETA), and tetraethylenepentamine (TEPA) was investigated. For the functionalization of PET films surface we used a new way of treatment, a “sandwich model”. Physical-chemical properties of functionalized PET films were analysed. Qualitative and quantitative determination of the introduced amine groups were examined by means of Fourier Transform Infrared Attenuated Total Reflexion (FTIR — ATR), X-ray photoelectron spectroscopy (XPS), and potentiometric titration. Gained wetting properties were determined by using contact angle measurements and thoroughly analysed by acid-base approach. In addition, surface topography was investigated by atomic force microscopy (AFM). The amount of the introduced amino groups after TETA incorporation has been found to be two times higher as compared to TEPA. Wetting properties were significantly improved after aminolysis. Surface free energy was higher for PET — TETA treated film than that observed for PET — TEPA treated which is in accordance with titration results. The collagen immobilization onto PET treated films was evidenced by using AFM and subsequently by using XPS.

A novel method to bind soybean protein onto the surface of poly(ethylene terephthalate) fabric

2016 ◽  
Vol 87 (4) ◽  
pp. 460-473
Author(s):  
Jianfeng Zhou ◽  
Dandan Zheng ◽  
Fengxiu Zhang ◽  
Guangxian Zhang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ethylene Terephthalate ◽  
Soybean Protein ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pet Fabric ◽  
Poly Ethylene Terephthalate ◽  
Pet Fibers ◽  
Diffraction Patterns ◽  
Poly Ethylene

In this study, –NH2 groups were introduced to a poly(ethylene terephthalate) (PET) fabric to make the fabric hydrophilic and, then, soybean protein was bonded on the surface of the modified PET fabric to obtain a soybean protein/PET composite fabric. The –NH2 groups allowed the soybean protein to be firmly bonded on the surface of the modified PET fabric. Scanning electron microscopy images showed that the surface of each modified PET fiber had a small number of grooves and that there was a thin film on each soybean protein/PET fiber. Attenuated total reflectance Fourier transform infrared spectra demonstrated that the nitrated and reduced PET fibers were introduced –NH2 groups and that there were –CO–NH– groups on the surface of soybean protein/PET fibers. X-ray photoelectron spectroscopy analyses showed that there was a nitrogen element on the modified PET fibers. The X-ray diffraction patterns suggested that the crystal structures of the modified fibers did not change significantly during the modification processes. The thermogravimetry results showed that the thermal stability of soybean protein/PET fiber kept well. The wearability tests indicated that the breaking strength and elasticity of the original fabric were well retained by the modified fabrics. The soybean protein/PET fabric had good levels of hydrophilicity and softness when the binding rate was below 3.0%.

scholarly journals Plasma Treatment of Poly(ethylene terephthalate) Films and Chitosan Deposition: DC- vs. AC-Discharge

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 508
Author(s):  
Tatiana S. Demina ◽  
Mikhail S. Piskarev ◽  
Olga A. Romanova ◽  
Andrey K. Gatin ◽  
Boris R. Senatulin ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Photoelectron Spectroscopy ◽  
Ethylene Terephthalate ◽  
Biomedical Application ◽  
Control Surface ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Atomic Force ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Plasma treatment is one of the most promising tools to control surface properties of materials tailored for biomedical application. Among a variety of processing conditions, such as the nature of the working gas and time of treatment, discharge type is rarely studied, because it is mainly fixed by equipment used. This study aimed to investigate the effect of discharge type (direct vs. alternated current) using air as the working gas on plasma treatment of poly(ethylene terephthalate) films, in terms of their surface chemical structure, morphology and properties using X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy and contact angle measurements. The effect of the observed changes in terms of subsequent chitosan immobilization on plasma-treated films was also evaluated. The ability of native, plasma-treated and chitosan-coated films to support adhesion and growth of mesenchymal stem cells was studied to determine the practicability of this approach for the biomedical application of poly(ethylene terephthalate) films.

Surface Characterization and Antibacterial Evaluation of Poly(Ethylene Terephthalate) Modified by Chitosan-Immobilization

2005 ◽  
Vol 288-289 ◽  
pp. 331-334 ◽  
Author(s):  
Peng Li ◽  
Jin Wang ◽  
W.C. Lu ◽  
H. Sun ◽  
Nan Huang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Bacterial Adhesion ◽  
Surface Characterization ◽  
Ethylene Terephthalate ◽  
Attenuated Total Reflection ◽  
Poly Ethylene Terephthalate ◽  
Modified Surface ◽  
Poly Ethylene ◽  
Pet Films

Biomedical PET films were modified by the approach of chitosan-surface-grafting. Attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) revealed that chitosan molecules were successfully grafted on the PET surface. The bacterial adhesion on the modified surface was evaluated by bacteria plate counting in vitro and scanning electron microscopy (SEM). The results testified that chitosan did make the surface of PET become more antibacterial. The free energy of adhesion (∆Fadh) between the bacteria and the chitosan-immobilized surface of PET was calculated. The value of the ∆Fadh was positive, which suggests that the process of bacterial adhesion on the modified PET surface was not thermodynamically favorable, namely, not spontaneous.

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