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Polybutene exists in two isomeric forms depending on where the carbon double bond is positioned in the monomer molecule. If it is between the first and second carbon atoms in a linear molecule (butene-1) , then the chemically accurate name of the resulting polymer is polybutene-1 (pb-1) . If it is a branched monomer molecule then the resulting polymer is called
The polymer we are concerned with is polybutene-1. In the past this polymer has been referred to as polybutylene, pb, pb-1 and polybutene, as well as its chemically correct name, polybutene-1.
In comparison with other polyolefin materials, polybutene-1 has a higher level of resistance to strain under continually applied stress over long periods of time. This is known as creep behaviour and
The embroidery insole is completely made by hand techniques and it is some kinds of treasure that has been kept for a long time, which is an art craft that can not be accomplished by any other modern
Так же в категории "Трубы для сантехники, водоснабжения и канализации":
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