marking period in science. Slime is made up of elements that are mixed together. The "slime" formula is sodium tetraborate decahydrate (Na2B4O7•10H2O), commonly known as borax, to a solution of white glue and water. White glue is an example of a polymer--it is made of long chains of polyvinyl clear plastic film molecules. These chains slide past one another fairly easily, enabling the glue to be poured from the bottle. But when the borax is added to the glue, a highly (thick and slow-pouring),…
used material for packaging in almost every industry. The word ‘plastic’ comes from the Greek plastikos which means easily shaped (Robertson, 2013). Plastic is the combination of many molecules that linked together as one long chain which made from polymers: poly (Greek) means many and meros (Greek) means part (Robertson, 2013). Raw materials of plastic are called feedstock which come from natural and synthetic resources, such as crude oil, natural gas, coal, cellulose, starch and proteins…
thermal characteristics and withstands temperature upto 200 oC without any significant degradation. Characteristics such as transmittance (T), absorption (A), refractive index (n) and extinction coefficient (k) are also reported. Keywords: ); Flexible Polymer Substrate, Polydimethylsiloxane (PDMS), Thin Films, Organic Light Emitting diodes (OLEDs),Transmittance. 1. Introduction Organic light-emitting devices (OLED) have attracted…
What is Styrofoam? Styrofoam is a brand of closed-cell extruded polystyrene foam currently created for thermal insulation and craft applications. Dow Chemical Company retained and produced the Styrofoam. Through petroleum product known as styrene, Styrofoam was created. The styrene is amended into a clear molten mass of polystyrene through a complex chemical process known as polymerization. It would become a hard plastic if it were left to cool. Disposable eating utensils are created from this…
Kevlor A synthetic material which has high tensile strength and used in manufacturing of tires and also as a reinforcement agent in manufacturing of protective parts like helmet etc…, HISTORY In 1930’s a chemical company called DuPont prepared commercially succeful super polyamide. Actually in 1964 Stephanie kwolek discovered kevlor in DuPont laboratory while doing research on the high performance chemical compounds. Kevlor is patented Stephanie kwolek in 1966 which is used by many police…
4.Polymer biosurfactants –manoproteins,liposan,emulsion and polysaccrides –proteins complex. 5.Particular biosurfacatnts-extracellular portion of membrane vesicles of hydrocarbon ,sometimes useful in substrate uptake by microbes as by forming microemulsions…
objects which we use in our everyday lives such as phones, cars, cooking utensils, computers and shoes, (http://www.slideshare.net). Plastics are a group of material which can either be synthetic or naturally occurring. Plastics are considered as polymers a substance which has a molecular structure with a large number of units bonded together, (http://www.chemheritage.org). Most plastics are made from crude oil which is a liquid derived from petroleum, (http://science.howstuffworks.com).…
Topical ointments Introduction: An ointment is semi solid topical preparation applied to external application with rubbing effect. It may be a vehicle or media for a drug or it may serve like a protective or emollient. Ointments show plastic flow characteristics. When the ointment is applied it is definite yield value and the resistant to flow drops as the applications to the skin is continued. Body: • Uses : There are two types of ointments: A- Medicated: used to treat different…
6.3. A. Microemulsions (135-143) Microemulsions are clear, stable, isotropic mixtures of oil, water, and surfactant, frequently in combination with a cosurfactant 135-137. Microemulsions have several advantages such as enhanced drug solubility, good thermodynamic stability, and higher transdermal permeability over conventional formulations 138,139. Many studies reported the use of microemulsions as topical drug delivery vehicles showed their ability to improve transdermal and dermal delivery…
How this fact neoprene? The wetsuit is made by a set of fabrics neoprene (it is a type of synthetic rubber with micro bubbles) that sewed or sealed to each other whose task is to try to prevent the passage of water or heat loss when one is wearing. Today the technology advanced a lot and we almost waterproof neoprene. Who invented the wetsuit? But this was not always so. The first sketches that were found on something like a neoprene date from the time of Leonardo da Vinci. Much later, Hugh…