Polymer

since the first polymer was fabricated in 1907, scientists have been seeking new applications for classic polymers (Brewer, 2006). Recently, in 2010, an enhanced structure of the photovoltaic cell (PVC) was proposed: synthesising new polymers from regular polymers for advanced donating and electron-accepting (D-A) moieties in PVCs (Mike et al., 2010). Also, in 2005, another additional application for traditional polymers has been discovered. By adding cinnamic acid to a flexible polymer, a material is

Introduction The history of polymers stretch back millions of years. These “primitive” polymers were created by nature to fulfill the needs of information storage, energy storage and information reproduction. Human made polymers are a more recent invention, of the last two hundred years or so. These polymers are general made of highly flammable hydrocarbons and their derivatives. Fires caused by a combination of human careless and the physical properties of hydrocarbons have caused millions of dollars

consists of two or more materials where polymers are used as matrix materials usually. These materials behave together to produce the best properties of the scaffold, duplicating the same composite features of bone. In particular, polymer- based composite scaffolds may mimic the structure of natural bone which is mainly made of HA and collagen. Showing better osteoconductivity, HA can be considered the inorganic reinforcing phase of the composite scaffold, while polymers such as PCL, PLLA, PGA, PLGA function

affected the frontier energy levels, film morphology, and the resulting charge transport properties. Bimodal semi-crystalline orientation and charge carrier transport properties were studied by grazing incidence wide-angle X-ray scattering (GIWAXS) and polymer filed effect transistor (PFET) characteristics measurements. The hole mobility as high as 0.1 cm2/Vs in PFET was measured for poly(2,5-bisthieno[3,2-b]thiophene-1,4-bis(decyltetradecyloxy)benzene-alt-4,7-(5,6-difluoro-2,1,3 -benzothiadiazole)) (PPDTT2FBT)

2.3 Ingredients Decomposition Oxidizer and binder decomposition play very significant role during the combustion of composite propellants. Inorganic oxidant and polymeric binder are the major components of their formulations and AP is the practical (still in use) oxidizer in the composite propellant formulations [26]. Available information on decomposition of binder in general and AP in particular have been collected and reviewed from the viewpoint of their application in the composite propellant

The ideal polymers for nanoparticle production must be biodegradable and biocompatible. Moreover, when NPs are produced as buccal delivery systems, the polymers must be mucoadhesive to increase residence time, enhancing the amount of drug that permeates the mucosa and reaches systemic circulation [86]. The mucoadhesion can be obtained either by the formation of electrostatic or hydrogen bonds. Since mucin presents a negative net charge, cationic polymers are preferable for production

Abstract: With the emergence of more novel and effective drug therapies, increased importance is being placed upon the methods by which these drugs are being delivered to the body. Different methodologies have been heavily investigated as possible solutions , one of these methods are intelligent or ‘Smart polymeric drug-delivery systems’. “Stimuli responsive” and “self regulating” drug delivery systems have captured the imagination of researchers, in large part because they suggest a means to mimic

oxide, wood flour, ivory dust, cellulose and starch. Additives, fillers, and reinforcements are used to change and enhance the physical and mechanical properties of plastics. In general, reinforcing fibers increase the mechanical properties of polymer composites while particular fillers of various types increase

Two factors can be used to explain this phenomenon. The first one is the BT particles interact strongly with the macromolecular SR, thus restricting the mobility of the molecular chains. The second one is the polymer chain entanglement limits the movement of polymer chains [38]. The interface polarization will increase the dielectric constant as well as the dielectric loss of the composites. As shown in Figure 4(b), the dielectric loss tangent of the BT/SR composites is larger than that

The project that I’m doing is rubber band elasticity being affected by temperature. Part of this experiment actual includes atoms, molecules, and polymers. A rubber band is an example of natural polymer. The chains of molecules in the rubber have a natural elasticity; they can stretch when pulled. Polymers are certain kinds of molecules. When the material gets hotter the molecules vibrate more intensely. When the molecules bump into each other the material will tend to expand. When the temperature