Tuesday, May 27, 2014

Let us, then, in this class, study a little of the history of plastics. We will also have informati

Walk through your home and note carefully the things you have around you: the furniture, curtains, carpets, appliances, kitchen utensils, clothes in the drawer, childrens toys. Now look out the window. Note the vehicles from the street, the shop windows, the clothes and shoes of people. Between the supermarket, examine the packaging. All these things have something in common. You know what?
If you do not know, let's not do thriller: a material that is virtually indistinguishable from the tenth century Although invented in the 1870s, it has only been successfully industrialized in 1909 We are talking about a huge family:.'s Family plastic. Invented from a market need, plastic arose from an attempt to replace a natural material. After a slow evolution until the Second World War, became the essential raw material of many old and new products. So every need, right out of research labs a synthetic more versatile, more uniform and more economical material.
Let us, then, in this class, study a little of the history of plastics. We will also have information on its chemical structure, characteristics, and manufacturing applications. And finally, we'll discuss the impact of this material on the environment, and we would like you to think and discuss about it with your friends.
For thousands of years, man used the materials he saw in nature. upholstery cleaning Some of these materials, such as wood and stone, it worked the way they were. Others, such as metal, it was discovered little by little and, in most cases, actually. And then the man realized that he could modify, upholstery cleaning merge, add elements, alloyed and refine. Plastic is the only material that was actually "invented".
Several authors have different dates for his invention:. 1863 1864 1868 1870 But all agree on one aspect: the plastic came the demand for a substitute for ivory in the manufacture of billiard balls. Who got it was the North American named John Wesley Hyatt. After several failed attempts, he discovered unintentionally when he spilled a bottle of collodion (or nitrocellulose) that this is agglutinated like glue. Adding camphor to cellulose nitrate upholstery cleaning and subjecting the mixture to a certain temperature and pressure he obtained a moldable material to which they gave the name of celluloid.
Believe it Why not be chemical and not knowing the explosive properties of nitrocellulose, John Hyatt experimented a chemical that would not do, and the researchers did not know until today how he survived them.
The first billiard balls manufactured upholstery cleaning by Hyatt consisted of a core of bonded ivory powder lacquer is coated with a layer of collodion (nitrocellulose). The balls just exploded when manufactured clashed against each other.
Leo Hendrik Baekeland Belgian. Earnest study on polymerization upholstery cleaning and condensation, it could make possible a method for controlled polymerization reactions to produce plastic resins in commercially viable quantities. Instead of delaying the polymerization reaction, Baekeland hastened to. In an autoclave at a temperature of 200 º C, he obtained a spherical mass, amber, whose surface upholstery cleaning was an accurate impression of the bottom of the container, including the screw heads. Was "invented" Bakelite, the first synthetic plastic.
The success of this material upholstery cleaning and its numerous applications has led to systematic research on plastics and consequently the new discoveries that lead to new uses. The use of computers upholstery cleaning in the research upholstery cleaning and development of new products, together with the advancement in technology upholstery cleaning create plastic materials with increasingly better physical properties. So every day, the automotive, construction, electronics devices, personal computers and sports equipment feature new uses for new plastics. upholstery cleaning
But exactly what is the plastic? In this first part of the class, you may read strange words such as phenol, formaldehyde polymerization. They are part of the answer, but are not the whole answer. Continue to the next part of the lesson in which we will try to solve this puzzle.
1. Write F in front of the false judgments and V in front of true sentences. Then correct the false and reescrevaas. a) () The plastic was invented upholstery cleaning around 1870, but only began to be industrialized successfully in 1909. b) () The plastic came from a market need. c) () The quality of Bakelite and its many applications have led to new research that created plastic with ever-improving properties. d) () The automobile industry, electronics, construction and sports equipment were benefited by new applications of plastics.
If you go to the dictionary, and

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