Polymers are long chains of monomeric compounds that are produced by polymerisation of these monomers. Ranging from natural to synthetic, polymers play a very ubiquitous role in pharmaceutical sciences and chemistry. Polystyrene, nylon is some of the examples of synthetic polymers whereas DNA and proteins are called as biopolymers. A most common example of polymer is polythene bag. Natural compound materials like shellac, amber, wool, silk and natural rubber are used for hundreds of years. A spread of alternative natural polymers exists, like polysaccharide, that is that the main constituent of wood and paper. The list of artificial polymers includes India rubber, phenol aldehyde rosin (or Bakelite), neoprene, nylon, polyvinyl resin (PVC or vinyl), vinylbenzene, polythene, plastic, polyacrylonitrile, PVB, silicone, and plenty of additional. Most ordinarily, the ceaselessly coupled backbone of a chemical compound used for the preparation of plastics consists chiefly of carbon atoms.
Review article comes in the form of systematic reviews and literature reviews and are a form of secondary literature. Systematic reviews determine an objective list of criteria, and find all previously published original research papers that meet the criteria. They then compare the results presented in these papers. Literature reviews, by contrast, provide a summary of what the authors believe are the best and most relevant prior publications.
The concept of "review article" is separate from the concept of peer-reviewed literature. It is possible for a review to be peer-reviewed, and it is possible for a review to be non-peer-reviewed.
Last date updated on January, 2021