Plastics are synthetic substances produced by chemical reactions. Almost all plastics are made from petroleum‚ except a few experimental resins derived from corn and other organic substances. "Plastics" derived their name from their properties to be molded‚ cast‚ extruded or processed into a variety of forms‚ including solid objects‚ films and filaments. These properties arise from their molecular structure. Plastics are polymers‚ very long chain molecules that consist of subunits (monomers) linked
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|Just about everyone knows that plastic valves‚ pipes‚ tanks‚ and fittings are molded‚ but there ís a bit more to it than that. Knowing something | |about the processes that are used to produce these products will help to make you more knowledgeable in selecting and using them in various | |applications. | |
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Plastic Surgery: The Good‚ the Bad‚ and the Ugly More than ever‚ millions of young adolescents are seeking out plastic surgery because the influence of the media. Teenagers are finding more imperfections with their body and are less and less satisfied with their appearance. President Scott Spear‚ MD‚ chief of plastic surgery says‚ "There’s a common belief among the public that a large percentage of young adults and teens are having cosmetic surgery" (Obesity‚ Fitness & Wellness Week). Despite
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advantages of plastic surgery can be many in the right circumstances.Plastic surgery can be exactly what you need to enhance your self image. Having a positive self image can give you the self confidence that you need to get a better job‚ try new things and it will give you a general overall feeling of well being. . Another advantage of cosmetic surgery is the ability to correct physical defects. These patients may have physical defects that have resulted from an accident or a bad case of acne as a
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Mandy How Kar Voon Professor Denine Lutz English 10‚ Section 91 23 April 2013 Plastic Surgery “The Right to Be Beautiful?” These days‚ people are growing up surrounded by media portrayals of the perfect face and body. It’s in the advertisements‚ on television‚ movies and just about everywhere. Presently‚ society has frame set the picture of women’s beauty along with a pretty face‚ perfect skin‚ and slender frame as a rail thin super model. However‚ nobody’s perfect‚ and that is just a
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USING PHENOL AND FORMALDEHYDE. INDRODUCTION: WHAT IS BAKELITE? Bakelite or polyoxybenzylmethylenglycolanhydride is an early plastic. It is a thermosetting phenol formaldehyde resin‚ formed from an elimination reaction of phenol with formaldehyde. It was developed by Belgian-born chemist Leo Baekeland in New York in 1907. One of the first plastics made from synthetic components‚ Bakelite was used for its electrical non-conductivity and heat-resistant properties in electrical insulators
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Plastic Pollution in Hawai’i Plastic plays a big part of our lives. The food we eat is wrapped with it‚ the toys our siblings or children play with is made from it‚ the television we watch is made with it‚ we play video games with plastic controllers‚ we listen to music with plastic head phones and the shelves we use is made with plastic. Material items made with plastic can be useful‚ cheaper‚ and durable but it can also harm the environment. All of these plastic items don’t just disappear
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SAY NO TO PLASTICS!! As quoted by Lord Byron‚ “There is a pleasure in the pathless woods‚ There is a rapture on the lonely shore‚ There is society‚ where none intrudes‚ By the deep sea‚ and music in its roar: I love not man the less‚ but Nature more.” The earth is the only known world to harbour life. There is nowhere else‚ at least in the near future‚ to which our species could migrate. For 200 years we have been conquering nature‚ now we are beating it to death. One of the
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Refuse single-use and disposable plastics The facts Plastic is forever Plastic creates toxic pollution at every stage of its existence: manufacture‚ use‚ and disposal. Plastic is a material that the Earth cannot digest. Every bit of plastic that has ever been created still exists‚ including the small amount that has been incinerated and has become toxic particulate matter. Plastic poisons our food chain In the environment‚ plastic breaks down into small particles that attract toxic chemicals
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school lunch tray? They can all be made from recycled plastic bottles or containers. In fact‚ the bottle you recycle in your own town can end up being spun into a pair of mittens worn by a child who lives in Japan. The plastic containers you recycle can take quite a journey once they leave your house. Of course‚ they can also wind up being put to the same use as before. We’re going to explore some unique paths you may not know about. Plastic recycling began in communities in the early 1980s with
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