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plastic is symbolized by triangle and number 2. The type of plastic HDPE is easy to recycle, so this plastic is much sought after by businessmen for plastic recycling. This HDPE plastic is made from ethylene with the catalyst process. Most types of plastic HDPE are used for items such as plastic bottles, bottle caps and children's toys. Benefits for HDPE plastic users at low prices, resistant at temperatures -40oC to 90oC and resistant to chemicals. Figure 3. HDPE Plastic Fibre 2.11 CHEMICAL COMPOSITION OF HDPE High-density polyethylene (HDPE) is obtained under conditions of coordination polymerization initiated by a mixture of titanium tetrachloride (TiCl4) and triethylaluminum [(CH3CH2)3Al]. Coordination polymerization was discovered by German chemist Karl Ziegler. Ziegler and Italian chemist Giulio Natta pioneered the development of Ziegler-Natta catalysts, for which they shared the 1963 Nobel Prize for Chemistry. The original Ziegler-Natta titanium tetrachloride-triethylaluminum catalyst has been joined by a variety of others. In addition to its application in the preparation of high-density polyethylene, coordination polymerization is the method by which ethylene oligomers, called linear α-olefins, and stereoregular polymers, especiallypolypropylene, are prepared. 23PDF Image | concretes that use polymers as a binder
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