To Develop a Biocompatible and Biodegradable Polymer-Metal Composite with Good; Mechanical and Drug Release Properties

Abstract

For achieving additional benefits and improving the material characteristics two or more materials are often combined together in the form of composites. Composites are important because of their light weight, high strength and flexibility of design. Composite materials provide various advantages based on their particulate or fibrous nature and on the basis of individual qualities of the constituting elements of the composites. Besides the multiplied benefits achieved with the composite materials, they being composed of two different materials exhibit greater challenges and biocompatibility threats which need to be addressed while developing a composite material. A structural composite of bioabsorbable nature is developed using a polymeric material and metal particles. The composite material so developed would provide altered strength and flexibility, better than the individual constituting materials for use in various biomedical devices and would eventually degrade on subject to exposure to the physiological environment. The two different varieties of the composite have been developed using metal particles and metal salt and they have been tested for their tensile, degradation and drug release properties, which have been found satisfactory for use of the composite in various biomedical devices and drug release applications.

Investigation of fatigue crack growth rate in CARALL, ARALL and GLARE

“…To predict the fatigue crack growth properties of FMLs analytical model based on UTS, elastic modulus and fracture energy of laminates was developed. Equation (12) presents the mathematical form of Paris law.…”

“…8 Fibre metal laminates are commonly produced by autoclave process but nowadays a process called Vacuum Assisted Resin Transfer Moulding (VARTM) is becoming more popular because of its ability to produce high-quality reinforced composite products at low cost. [9][10][11][12] During fabrication of these laminates, mechanical, chemical, electrochemical and dry surface treatments are applied to metal sheets prior to adhesive bonding. 1,13,14 These treatments promote different adhesion mechanisms like chemisorption, physisorption and mechanical interlocking which not only improves the adhesive bond strength but also influence its failure mechanism by improving its structural integrity.…”

Effect of Natural Macromolecule Filler on the Properties of High‐Density Polyethylene (HDPE)

“…Figure shows the X‐ray diffraction (XRD) patterns of parent polymer and the composites. The pure polymer showed three diffractions peaks, the most intense peak at 2 theta of 21.9° corresponding to (110) phase followed by peak at 24.3° with less intensity correspond to (200) and finally weak peak at 24.3° for (020) which agree with the literature for HDPE diffractions . After the introduction of Asphaltenes the diffraction peaks was almost the same and no change was observed in the XRD pattern or the intensity which mean the addition of the Asphaltenes did not change the structure or the matrix of the polymer.…”

“…Other workers have also supported this structure who described asphaltene molecule consists of 3–5 unit‐sheets of condensed aromatic and naphthenic rings with aliphatic side chains. These aromatic sheets of asphaltene molecules are held together by heteroatoms such as nitrogen, sulfur and/or thioether bonds, polymethylene bridges, and complexes of nickel and vanadium metals . The X‐ray diffraction studies of Saudi Arabian crude asphaltenes supports the most common concept of condensed aromatic sheets, tendency to stacks, containing alkyl and naphthenic systems on their periphery as the structure of asphaltenes …”

Solubility and diffusivity of propane in heavy oil and its SARA fractions

“…As mentioned by Ali, [1] the largest accumulation of heavy oil and tar sand (known as the "oil sands") is in Canada (3 trillion bbls) followed by Venezuela (2 trillion bbls). There are abundant resources of bitumen and heavy oil in Canada that are considered a potential source of petroleum products for the coming years.…”