Answerslab

Answerslab
Question and Answers | Ask Question | Share Information| Know Answers

Wednesday, August 24, 2011

polyethylene,Ethylene and petroleum

History

Plastic bags are often made from polyethylene,
which consists of long chains of ethylene monomers.
Ethylene is derived from natural gas and petroleum.

From the mid 1980s on, the use of plastic bags became common for carrying daily groceries from the store to vehicles and homes.

As plastic bags increasingly replaced paper bags,
and as other plastic materials and products replaced glass,
metal, stone, timber and other materials, a packaging materials war erupted with plastic shopping bags at the center of highly publicized battles.

government survey has provided estimates for global plastic bag use, environmental activists estimate that between 500 billion and 1 trillion plastic bags are used each year worldwide.
In 2009 the United States International Trade Commission did report that the number of bags used in the United States was 102 Billion.


Facts about plastic & plastic bags


 Approx. 380 billion plastic bags are used in the United States every year. That’s more than 1,200 bags per US resident, per year.

 Approx. 100 billion of the 380 billion are plastic shopping bags.

 An estimated 12 million barrels of oil is required to make that many plastic bags.
 Only 1 to 2% of plastic bags in the USA end up getting recycled.
 Thousands of marine animals and more than 1 million birds die each year as a result of plastic pollution.

 The United Nations Environment Programme estimates that there are 46,000 pieces of plastic litter floating in every square mile of ocean.

 Plastic bags are often mistakenly ingested by animals, clogging their intestines which results in death by starvation. Other animals or birds become entangled in plastic bags and drown or can’t fly as a result.

Uses and Diseases

Uses.1.Food packaging, plastic wrap, containers for toiletries, cosmetics, crib bumpers, floor tiles, pacifiers, shower curtains, toys, water pipes, garden hoses, auto upholstery, inflatable swimming pools
(made of Polyvinyl chloride)

Diseases:- Food packaging, plastic wrap, containers for toiletries, cosmetics, crib bumpers, floor tiles, pacifiers, shower curtains, toys, water pipes, garden hoses, auto upholstery, inflatable swimming pools


Uses.2.Softened vinyl products manufactured with phthalates include vinyl clothing,general purpose lab ware, inhalation masks, many other medical devices (made of Phthalates)

Diseases:- Endocrine disruption, linked to asthma, developmental
including cancer, birth defects, hormonal changes, declining sperm counts, infertility, endometriosis, and immune system impairment.

Uses.3.Water bottles(made of Polycarbonate, with Bis phenol)

Diseases:- impaired  immune function, early onset of puberty, obesity, diabetes, and  hyperactivity


Uses.4.audio cassette housings, CD cases, disposable cutlery, building insulation, flotation devices, ice buckets, wall tile, paints, serving trays.
(made of Polystyrene)

Diseases:- Can irritate eyes, nose and throat and can cause dizziness and unconsciousness. Migrates into food and stores in body fat.

No comments: