Smart Polymers and Polyethylene Terephthalate

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Smart Polymers
Hydrogels ­ a hydrogel is an example of a smart material. It can change its structure in response to
salt concentrations, pH and temperature.
Hydrogels can be used in...
Cooking, some foods are hydrogels
Medical industry, catheters use hydrogel materials for tubing due to flexibility, you can use
hydrogels to apply them to wounds and cuts as a dressing due to the ability of water to bond
with the skin. They are also used to make contact lenses because of their ability to shape to
the eye.
Agriculture, one of the most important features of a hydrogel is the ability to hold amounts
of water many times their own weight. This characteristic is important for farming because
hydrogels can store water and nutrients in capsules in areas with dry land and slowly release
the contents, instead of dumping water all at once and having most of it evaporate.
PET ­ Polyethylene Terephthalate
PET is a plastic resin and the most common type of polyester. Two monomers--modified ethylene
glycol and purified terephthalic acid--are combined to form the polymer called polyethylene
Its properties include the product being strong, transparent, light weight, shatter-resistant,
recyclable, safe and versatile. Manufactures tend to use this material because of its products and
their customers choose it because it can be made to become resealable. Up to 100% of a PET
package can be made from recycled PET, and the material can be recycled again and again.
It's used to make new bottles, but recycled PET can also be made into fibre for carpets; fabric for
t-shirts or fleece jackets; fibrefill for sleeping bags, winter coats, and dog beds; industrial strapping;
sheet and thermoformed (clam shell) packaging; and automotive parts such as headliners, bumpers,
and door panels.


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