Recycling of Polyethylene Terephthalate In the United States, over 245 million tons of municipal solid waste (MSW) was produced by consumers in 2005. This is approximately 4.5 pounds of trash per person per day. This same year, 79 million tons of waste were recycled, a dramatic increase from 15 million tons in 1980. Of the total MSW in 2003,11.1% (26.7 million tons) was plastic. Although only 3.9% of plastics disposed in 2003 were recycled, PET was recovered at a rate of 25%.
home but by using my idea of using/melting plastic (high-density polyethylene) and comparing it to standard building materials that make houses , it will enable hundreds of thousands of people to have a place that they call home and it will create jobs as well. Investigative question: How does a high density polyethylene brick differ from a clay bricks in different tests for construction? Hypothesis: The high density polyethylene brick is more resistant to the construction tests than a
Manufacturing Cycle and Environmental Impact The most common form of polyethylene is petroleum based or olefins based; as before mentioned polyethylene compounds have a wide commercial applicability and are made from non-renewable resources (Harding, Dennis, von Blottnitz, Harrison, & S.T.L., 2007). Its manufacturing processes are regarded as energy intensive and release significant amount of CO2 and heat into the atmosphere (Broderick, 2008). Next a little more detailed description of polyethylene’s
Specific Aims A recent public health concern has implicated polyethylene terephthalate (PET) plastics, commonly used in recyclable plastic water bottles, as a common source of carcinogenic xenoestrogens. Xenoestrogens act as hormone disruptors, and can alter the natural homeostasis of the human body. Exposure to endocrine disrupting chemicals has been known to cause cancer, sexual dysfunction, and problems during puberty. Better understanding exposure to these chemicals will help improve awareness
Assignment 3 Q1: how does the industry work? Polyethylene is a petrochemical product that has been widely used in the plastic manufacturing, such as packaging, trash bins, and food containers. It is produced mainly from the polymerization process of ethylene, which is an ingredient derived from cracking crude oil and natural gas. There are three types of polyethylene: low-density polyethylene (LDPE); high density polyethylene (HDPE); and low linear density polyethylene (LLDPE), and each of them has distinctive
polystyrene and polyethylene (Shakhashiri). Polymers are synthesised using a chemical process known as polymerisation, where individual molecules called monomers are reacted to form chains or three dimensional networks. A look at the history of polymers reveals that many of the first discoveries were accidental. Since these discoveries, a whole new area of chemistry
952). Low-density polyethylene is very thin and stretchy, while high-density polyethylene is stiffer, more durable and has a higher melting point than its low-density counterpart. Both of these types of polyethylene are used to create many different items of plastic, including pipes, toys, and the one that consumers use every day in grocery stores: the plastic bag.
(a) stiffness, (b) strength and (c) fracture toughness for metals, technical ceramics, composites and fibre reinforced plastics with respect to those of bone [23–31]. CF: carbon fibre, GF: glass fibre, PA12: polyamide12, PC: polycarbonate, PE: polyethylene, PEEK: poly ether ether ketone, PLGA: poly(l-lactic-co-glycolic acid), PLLA:poly(l-lactic acid), PP: polypropylene, PSU: polysulfone, PTFE: polytetrafluoroethylene, PUR: polyurethane. References Clarke IC, Good V, Williams P, Schroeder D, Anissian
distribution, and disposal. Once these aspects of their use are considered, it is clear that the convenience of plastic shopping bags do not justify the harms to the ecosystem caused by their existence. Plastic bags are usually made out of high-density polyethylene (HDPE), a strong, durable plastic made from ethylene monomers (Clark). 134 million metric tons of ethylene are produced each year as of 2014, with 28% of that production going towards the manufacture of HDPE (Lazonby, “Ethene”). Ethylene is produced
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