File Name: list of natural polymers and synthetic polymers .zip
Synthetic polymers are human-made polymers , often derived from petroleum oil. From the utility point of view they can be classified into three main categories: thermoplastics , elastomers and synthetic fibers.
Active pharmaceutical ingredients and pharmaceutical excipients are the core of any pharmaceutical preparation. As we know that some polymers have thickening property, also the water based formulations are fluid in nature therefore in order to change the rheology of such formulations various polymers are used. These polymers act by increasing the viscosity of formulations. Starch, guar gum, alginates, pectin, gelatin, agar, carrageenan, cellular derivatives are the examples of natural polymer that are used to increase the viscosity of water based formulations meant for topical application. The present review deals with the use of such natural polymers as constituents of anti-aging formulations.
There are two types of polymers: synthetic and natural. Synthetic polymers are derived from petroleum oil, and made by scientists and engineers. Examples of synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy. Natural polymers occur in nature and can be extracted. They are often water-based. Examples of naturally occurring polymers are silk, wool, DNA, cellulose and proteins.
Polymer , any of a class of natural or synthetic substances composed of very large molecules, called macromolecules, that are multiples of simpler chemical units called monomers. Polymers make up many of the materials in living organisms, including, for example, proteins , cellulose , and nucleic acids. Moreover, they constitute the basis of such minerals as diamond , quartz , and feldspar and such man-made materials as concrete , glass , paper , plastics , and rubbers. The word polymer designates an unspecified number of monomer units. When the number of monomers is very large, the compound is sometimes called a high polymer. Polymers are not restricted to monomers of the same chemical composition or molecular weight and structure.
But what are polymers, exactly? Are they the same as plastics? How do you make them? And what do they have to do with paperclips? You might decide to have some extra paperclips branching off your main chain. Like paperclips, monomers are able to bond together in long chains. These chains can be linear, branched or networked.
ered, in addition to natural polymers, e.g., collagen, synthetic polymers such as. PLGA, poly(diol-co-citrate), and PCL. The list of nanofillers investigated for.
Handbook of Bioceramics and Biocomposites pp Cite as. Polymers were first used in medicine as biomaterials in the s for cornea replacement and as blood vessel replacement. Polymeric biomaterials offer a large diversity as matrix and inclusion materials in the development of biocompatible biostable, biodegradable, or bioresorbable polymeric biocomposite materials for tissue engineering and regenerative medicine applications. Natural polymers are considered as the first biodegradable biomaterials used in biomedical applications. Synthetic biostable polymers of the first generation of biomaterials were selected to provide mechanical support and minimize the host response of the related biomaterials.
Note: this document will print in an appropriately modified format 22 pages. Plastics and natural materials such as rubber or cellulose are composed of very large molecules called polymers. Polymers are constructed from relatively small molecular fragments known as monomers that are joined together. Wool, cotton, silk, wood and leather are examples of natural polymers that have been known and used since ancient times. This group includes biopolymers such as proteins and carbohydrates that are constituents of all living organisms.
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