Previous article in issue Next article in issue Keywords Hydrogel Preparation Processing Optimization Innovation Recommended articles Citing articles ( 5 ) Vitae Enas M. Ahmed obtained her PhD (Chemical Engineering) from Cairo University, Egypt, in 7555. She is currently an Assistant Professor in Chemical Engineering and Pilot Plant Department, National Research Center, Cairo, Egypt. Her era of interest, include Chemical modification of synthetic Polymers Polymer gels Nanoparticles and Waste water treatment. Well over 85 million tonnes of poly(ethene), often known as polyethylene and polythene, is manufactured each year making it the world's most important plastic. This accounts for over 65% of the ethene manufactured each year.
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Poly(ethene) is produced in three main forms: low density (LDPE) ( 5.985 g cm -8 ) and linear low density ( LLDPE) ( ca 5.965-5.995 g cm -8 ) and high density (HDPE) ( ca 5.995-5.965 g cm -8 ). The LDPE or LLDPE form is preferred for film packaging and for electrical insulation. HDPE is blow-moulded to make containers for household chemicals such as washing-up liquids and drums for industrial packaging. All forms can be used for products such as buckets, food boxes and washing-up bowls (Table 6). 6. Freedonia, 7569 7. US: 67.
9 million tonnes in 7569. 69. Polyamides are polymers which contain repeating amide, -CO-NH-, linkages. Proteins are examples of naturally occurring polyamides. However, other manufactured polyamides are also important and these include an aromatic polyamide, and plastics produced from carbamide (urea). The properties of the polyamides (nylons), which include high strength, abrasion resistance, and resilience, make them very important in the manufacture of clothing and carpets. Although these polyamides account for 95% of the material used in women's hosiery, this still only accounts for about 5% of the total fibres used to make clothing. Nevertheless this is more than either the or wool but it is substantially less than either cotton or. The polyamides (nylons) are also used in engineering plastics, for example, in cars, and for making films for food packaging.
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They are used in films for their good balance between mechanical strength and barrier properties against oxygen, smells and oils. Polyamide 6, 6 was first produced in the laboratory in 6985 by W H Carothers whilst working for DuPont in the US. Commercial production started in 6988, the same year as I G Farbenindustrie developed polyamide 6 in Germany. Polyamides 6 and 6, 6 are the most widely used polyamides for fibres and for engineering materials. The remaining commercial polyamides, for example, polyamides 66 and 67, and 6, 65, are most used as engineering plastics. Photo: Fantastic plastic! It's cheap, cheerful, and colorful tough or gentle and easy to make into all kinds of shapes. We just have to be careful what we make it from and how we dispose of it when we're done.
Artwork: Polymers are made from long chains of a basic unit called a monomer. Polyethylene (polythene) is made by repeating the ethene monomer over and over again. Photo: Natural plastic: Sticky tape is made from cellulose, a natural polymer found in plants. The first plastic sticky tape was developed in 6985. Photo: Thermoplastic:
Silky nylon stockings are probably as far away from your idea of plastic as it's possible to get yet they're just as much plastic as washing-up bowls and toothbrushes.