Polymer

as calculated at 227.2 nm ,223nm using Elico SL 210 UV-1700 UV Visible double beam spectrophotometer and methanol as well as phosphate buffer (ph 7.4) as a reference standard correspondingly. Compatibility studies The compatibility of drug and polymers under experimental condition is significant precondition before formulation. Incompatibility between drugs and excipients can modify stability and bioavailability of drugs, thereby, moving its safety and efficacy. Study of drug–excipients…

Although most Polymers are recyclable, Compression Moulding has more waste than when compared to other processes. To achieve the desired finish with Compression Moulding, the mould cavity is overfilled to some degree, in order to achieve the correct pressure to form the…

head-to-tail reaction is also more favorable since the fourth carbon has less steric interference from the surrounding substituents. When adding in the head-to-head orientation, the acetate group portions of the monomers (which act as substituents to the polymer chain) are placed right next to each other— in the head-to-tail orientation there is one carbon in-between. Literature values indicate that there should be no more than 1 to 2 % of head-to-head linkages in polyvinyl acetate5. This…

donor-acceptor blend of polymers.4 To ensure effective charge percolation, the structure of n-doped and p-doped molecules must provide continuous pathways while intermingling on a 10 nm scale to allow exciton decoupling. Irregular quasi-crystalline…

Abstract: We describe the successful synthesis of Polypyrrole-Gold nanocomposites (PPy-Au NCs) by the chemical oxidative polymerization of pyrrole with ferric chloride as an oxidizing agent, in the presence of a colloidal suspension of gold nanoparticles. Gold nanoparticles (Au NPs) were synthesized by standard citrate reduction method. Au NPs and PPy-Au NCs were characterized by Transmission Electron Microscopy (TEM), Atomic Forced Microscopy (AFM), Scanning Electron Microscopy (SEM), Fourier…

method as it would serve as a readymade transplantable kidney or section to replace a damaged one that would also mimic the in vivo 6 environment. Two of the most common methods of developing scaffolds are decellularized organs and biocompatible polymers. The advantage of developing a whole scaffold would enable an organ to be entirely transplanted into a patient without the need of waiting on a donor. Additionally, the patient’s own cells would be able to be seeded into the scaffold to reduce…

compared to other biopolymers. It possesses better physical properties than polypropylene for food packaging applications. (Chaijamrus & Udpuay, 2008) As a homopolymer, PHB is highly crystalline (50%-70%). It is an important characteristic of a polymer in order to regulate the mechanical properties of the material. The value of water vapor transmission rate (WVTR) of PHB is about 5.6 g/m2/24h…

linen from the flax plant etc. Examples of synthetic fabrics include polyester, nylon and acrylic which are derived from oil and coal. All fabrics contain long molecular chains called polymers. Polymer is a large molecule formed by joining many small molecules together. The varied properties of each and different polymers are the reflection of the chemical structures and their…

increases with temperature is given in Table 4.4, which is the common characteristic of disordered materials. An increase in ac conductivity with frequency and temperature indicates charge transported by hopping through the defect sites along the polymer chain [70]. Also the increase in electrical conductivity with increasing temperature is due to the buildup of ordered polycondensed rings, which allow charge transport. This temperature dependence of conductivity at higher temperatures suggests…

ultraviolet light the stain is visible again. Moreover, in order for an organic compound to absorb the visible light region, it must be conjugated…the degree of conjugation directly correlates to the electromagnetic spectrum’s wavelength and frequency. Polymer…