Polystyrene/calcium phosphate nanocomposites: Contact angle studies based on water and methylene iodide

Thomas, Sabu; Abraham, Rosalin; Bandyopadhyay, Sri; Hills, P. D.

doi:10.3144/expresspolymlett.2008.63

Cited by 73 publications

(46 citation statements)

References 39 publications

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“…The water contact angle values of the test liquids were measured by putting a sessile drop of test liquid on the surface of the films [39][40][41][42]. Each modified p(HEMA-GMA) films surface has different functional groups such as \OH, \NH 2 , \NH\, \SO 3 H, \COOH, \CH 3 and aromatic rings for ionic, polar and hydrophobic interaction with proteins and cells.…”

Section: Evaluation Of Contact Angle Measurements and Surface Energy mentioning

confidence: 99%

“…The basic parameters (γ − ) of the p(HEMA-GMA)-GA-Phe and p(HEMA-GMA)-GA-HANI are larger compared to their acidic parameter (γ + ). The relatively high basic (γ − ) component of the surface energy is caused by the electron ion pairs of oxygen atoms contained in the copolymer (hydroxyl, carbonyl and carboxyl functionalities), which are effective in Lewis base sites [39][40][41][42][43]. On the other hand, opposite trend was observed for p(HEMA-GMA)-A p(HEMA-GMA)-EDA, p(HEMA-GMA)-HMDA p(HEMA-GMA)-GA-Arg and p(HEMA-GMA)-GA-His modified films.…”

Section: Evaluation Of Contact Angle Measurements and Surface Energy mentioning

confidence: 99%

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Poly (hydroxyethyl methacrylate-glycidyl methacrylate) films modified with different functional groups: In vitro interactions with platelets and rat stem cells

Bayramoğlu

Bitirim

Tunalı

et al. 2013

Materials Science and Engineering: C

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Keywords: Hydrogels biocompatible polymers contact angle blood cell adhesion hemolysis rat mesenchymal stem cells Copolymerization of 2-hydroxyethylmethacrylate (HEMA) with glycidylmethacrylate (GMA) in the presence of α-α′-azoisobisbutyronitrile (AIBN) resulted in the formation of hydrogel films carrying reactive epoxy groups. Thirteen kinds of different molecules with pendant \NH 2 group were used for modifications of the p(HEMA-GMA) films. The \NH 2 group served as anchor binding site for immobilization of functional groups on the hydrogel film via direct epoxy ring opening reaction. The modified hydrogel films were characterized by FTIR, and contact angle studies. In addition, mechanical properties of the hydrogel films were studied, and modified hydrogel films showed improved mechanical properties compared with the non-modified film, but they are less elastic than the non-modified film. The biological activities of these films such as platelet adhesion, red blood cells hemolysis, and swelling behavior were studied. The effect of modified hydrogel films, including \NH 2 , (using different aliphatic \CH 2 chain lengths) \CH 3 , \SO 3 H, aromatic groups with substituted \OH and \COOH groups, and amino acids were also investigated on the adhesion, morphology and survival of rat mesenchymal stem cells (MSCs). The MTT colorimetric assay reveals that the p(HEMA-GMA)-GA-AB, p(HEMA-GMA)-GA-Phe, p(HEMA-GMA)-GA-Trp, p(HEMA-GMA)-GA-Glu formulations have an excellent biocompatibility to promote the cell adhesion and growth. We anticipate that the fabricated p(HEMA-GMA) based hydrogel films with controllable surface chemistry and good stable swelling ratio may find extensive applications in future development of tissue engineering scaffold materials, and in various biotechnological areas.

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Section: Evaluation Of Contact Angle Measurements and Surface Energy mentioning

confidence: 99%

Section: Evaluation Of Contact Angle Measurements and Surface Energy mentioning

confidence: 99%

Poly (hydroxyethyl methacrylate-glycidyl methacrylate) films modified with different functional groups: In vitro interactions with platelets and rat stem cells

Bayramoğlu

Bitirim

Tunalı

et al. 2013

Materials Science and Engineering: C

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“…Elongation at break value of BNN-PS composites is almost same as that of neat PS showing the good reinforcement between the filler and the matrix. A basic model that describes the elongation at break given by Equation (16) [ [41][42][43]:…”

Section: Elongation At Breakmentioning

confidence: 99%

Mechanical properties of ceramic-polymer nanocomposites

Abraham¹,

Kuryan²,

Isac³

et al. 2009

Express Polym. Lett.

Self Cite

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Nano crystalline powders of Barium Sodium Niobate (BNN) with the composition Ba3–2x Na4+x R Nb10 O30 with (R stands for rare earth = 0, x = 0) have been prepared by conventional ceramic technique. Barium Sodium Niobate can form a wide range of solid solutions, incorporating rare earth and alkali, alkaline earth elements with different compositions. The powder belonged to tungsten bronze type structure with tetragonal symmetry and lattice constants a = b = 1.2421 nm and c = 0.3903 nm. XRD (X-ray Diffraction) SEM (Scanning Electron Microscope) and AFM (Atomic Force Microscope) studies revealed that the particle size is in the nanometer range. Composites are prepared by mixing powders of BNN with polystyrene at different volume fractions of the BNN. Melt mixing technique is carried out in a Brabender Plasticoder at a rotor speed of 60 rpm (rotations per minute) for composite preparation. Mechanical properties such as stress-strain behavior, Young’s modulus, tensile strength, strain at break etc. are evaluated. Addition of filler enhances the mechanical properties of the polymer such as Young’s modulus and tensile strength. The composites showed the trend of perfect adhesion between the filler and the polymer. The filler particles are distributed relatively uniform fashion in all composites and the particles are almost spherical in shape with irregular boundaries. To explore more carefully the degree of interfacial adhesion between the two phases, the results are analyzed by using models featuring adhesion parameter. The experimental results are compared with theoretical predictions

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“…The surface characteristics of any composite largely govern the wetting phenomena and hence the adhesion behavior [29][30][31]. Contact angle measurement of liquids on solid surfaces is a technique for quantifying the wettability and surface characteristics of solids [29].…”

Section: Contact Angle Measurementmentioning

confidence: 99%

“…11. The work of adhesion can be linked to the filler matrix interaction of filler with a liquid comparable with the virgin polymer [31]. Even though the liquid (water) selected do not imitate the neat polymer exactly, an attempt was done to correlate the work of adhesion of the nanocomposites with the filler matrix interaction [31].…”

Section: Contact Angle Measurementmentioning

confidence: 99%

Steel Cord Skim Compound for Radial Tyre Based on Natural Rubber-Carbon Black-Organoclay Nanocomposites

Mohanty¹,

Chandra²,

Bhandari³

et al. 2016

JMSE-B

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A novel carbon black (CB) and nanoclay (NC) filled system in Natural rubber (NR) matrix has been developed for steel cord tyre ply compound with optimized performance properties. The effect of partial replacement of CB (N-220) by two different kinds of nanoclay (Cloisite-20A and Cloisite-30B) on the adhesion properties has been extensively investigated. The nanocomposites have shown improved adhesion properties between steel cord and rubber (aged and unaged) i.e. pull out force and rubber coverage (%), for relatively lower loading of both Cloisite 20A and Cloisite 30B (3 phr). The addition of nanoclay at lower loading (upto 3 phr) leads to an increase in the overall performance of the rubber compound. Due to nano filler reinforcement, the cohesive strength of the nanocomposites increases, but it is still lower than the adhesive force between steel cord and rubber. As a result the failure is mostly cohesive with higher pull out force. The adhesion improvement is more significant in case of 3phr Cloisite 30B. Cloisite 30B contains polar modified quaternary alkyl ammonium ions as intercalants in its gallery spacing, which may form hydrogen bonding with the resin network available near the copper sulphide bonding layer and leads to better rubber reinforcement and higher pull out force. Dynamic contact angle measurement, transmission electron microscopy (TEM) and low angle X-ray diffraction (XRD) studies have been carried out to explain these phenomena.

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Polystyrene/calcium phosphate nanocomposites: Contact angle studies based on water and methylene iodide

Cited by 73 publications

References 39 publications

Poly (hydroxyethyl methacrylate-glycidyl methacrylate) films modified with different functional groups: In vitro interactions with platelets and rat stem cells

Poly (hydroxyethyl methacrylate-glycidyl methacrylate) films modified with different functional groups: In vitro interactions with platelets and rat stem cells

Mechanical properties of ceramic-polymer nanocomposites

Steel Cord Skim Compound for Radial Tyre Based on Natural Rubber-Carbon Black-Organoclay Nanocomposites

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