Polymer

Discussion The results demonstrated the various properties of polymers that each reaction produced. For the nylon polymerization, a condensation reaction took place and produced a long, polymer string. As described in Figure 1, the product was clear and several meters long, and the fibers held together when stretched. However, when a portion of the nylon string was heated, fibers weakened. The nylon turned a bright white, and, when the stirring rod was used to move the piece, the string broke in

1.INTRODUCTION “A combination of two or more materials (reinforcement, resin, filler, etc),differing in form or composition on a macro scale”. They usually consist of high performance fibres as reinforcing phases and polymers or metals as matrices. Generally two phases of composite they are matrix phase and reinforcement phase or dispersed phase. Matrix is the primary phase, having a continuous character, and its usually more ductile and less hard phase, it hold the dispersed phase and shares

Bio-based polymers are materials which are produced from renewable resources. The terms bio-based and biodegradable will be used repeatedly in the literature, however there is a key difference between the two types of materials. Biodegradable are defined as materials whose physical and chemical attributes will undergo degradation and completely deteriorate when exposed to microorganisms, aerobic processes, anaerobic processes, or both process simultaneously. On the other hand, Bio-based polymers can be

Abstract Conductive polymers have promising applications in the field of tissue engineering as tissue scaffolds. Many tissue types respond favorably to electrical stimulation, because of this conductive polymers can be used for the regeneration of damaged tissue. This review will focus on the synthesis and fabrication of conductive polymers as well as their applications in tissue engineering. Introduction All cells exhibit some form of electrical excitability, from voltage gated ion channels

Eudragit RS and RL 100 polymers have been selected as a carrier for fabrication of nanofibers due to their nice stability, biocompatibility, and nice adhesion over skin due to excellent swelling property, and presence of surface charge. These charges can facilitate prolonged residence time and adhesion over targeted site (Haznedar et al, 2004). Their combination customize drug release, moreover presence of quaternary ammonium compound further check reoccurrence of microbial infection. Chemically

Part:C A-1: Polymer weight averages and molecular distribution: There are two types of molecular averages from which we can , the number average and weight average, which can we calculate by knowing the number of molecules and that weight fractions in the polymer. If we are given numbers of molecules with their molecular weights. Then we can calculate number-average molecular weight (Mn) and weight average molecular weight (Mw). From that, we can get polydispersity index and know it is monodispersed

Water-soluble conjugated polymers (WCPs) have wide application prospects in biological imaging, diagnosis, and treatment areas. Currently, the synthetic methods of WCPs mainly include palladium-catalyzed coupling reactions (Suzuki, Heck, and Sonogashira), Wessling reaction, and FeCl3-catalyzed oxidative polymerization. All these methods follow the step-wise polymerization mechanism, which has disadvantages such as uncontrollable molecular weights, wide molecular weight distribution, difficult terminal

specific properties, low density, easy processing, good mechanical properties, good chemical resistance, excellent thermal and electrical insulating properties and low cost ( in comparison to other materials) [1]. Polyesters are a class of synthetic polymers built up from multiple chemical repeating units linked together by ester (CO-O) groups. Polyesters display a wide array of properties and practical applications. Permanent-press fabrics, disposable soft-drink bottles, compact discs, rubber tires

Introduction A lithium polymer battery- It is commonly abbreviated as LiPo, LIP or Li-poly . It is a rechargeable battery that uses a lithium-ion technology . It uses a polymer electrolyte instead of the liquid electrolyte that is more commonly used in other batteries. LiPo cells uses high conductivity semisolid (gel) polymers as electrolyte. It is used in tablet computers and many cellular telephone handsets. Lithium polymer cells have technically originated from lithium-ion and lithium-metal

these developments there are many debates that must be taken into account before implementation, such as ethical, social, and economic considerations, the accessibility and affordability of such materials, and the safety of the athletes using them. Polymers have made a considerable difference to sporting equipment in their installation in pole vaulting, hockey sticks, tennis