tecnologia zheng zheng li

                                             PLASTICS                   Plastics are materials formed by chains of carbon and hydrogen atoms. We call these chains polymers, while the atoms that form them are called monomers. There are three different types of plastics:    1 THERMOPLASTICS                                         Thermoplastics are defined as polymers that can be melted and recast almost indefinitely. They are molten when heated and harden upon cooling. One of thermpoplastic  characteristics is :  they are reversible, so the material can be reheated, reshaped, and frozen repeatedly.  As a result, thermoplastics are mechanically recyclable. Some of the most common...

       Plastics. 3D design and printing   🌸                                                                                                         exercise 1 and 2  1 car tyres are made of 19 percent natural rubber and 24 percent synthetic rubber wich is a plastic polymer .                                                                  2 The ink tube and cap of the pen are made of polypropylene, a slightly more environmentally friendly plastic that can be recycled. It is chosen for its durability and impact...