Sep 20, 2019
When Monomers with at least two functional groups react to form a polymer the process is called polyaddition.
Double bonds are separated to build new bonds.
Short and long chains react with each other.
The Polyaddition can take place at both ends of the arising chains.
Polyurethane, Polyureas and Epoxy resins are the most important products created through polyadditions.
Plastic: Polyaddition of Dialcohol and Diisocyanate to Polyurethane.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Sep 22, 2019
When Monomers with at least two functional groups react to form a polymer and produce a byproduct, it is called polycondensation.
The polycondensation can work only properly if the byproduct is taken away continuously.
Otherwise a low polymerisation degree leads to an end of the polycondensation.
A polycondensate with a high molar mass can be produced only with a reaction conversion of more than 99 %.
Furthermore the quantity needs to fit the stoichiometric ratio of the reaction.
Plastic: Polyester and Polyamides for example are produced by
polycondensation.
Related topics:
Polyaddition
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Jul 2, 2019
Chemical connections of monomers are called polymers.
They are macromolecules with the same inner structure.
Dependent on the amount of monomer types, polymers can be devided into homopolymers (one type of monomers), copolymer (multiple types of monomers) and polymerblends (multiple homopolymers and/or multiple copolymers).
The
Polymer Polyethylene.
Related topics:
Polyaddition
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Feb 15, 2019
The reaction that takes place when similar or different monomers are converted to polymers is described under the collective term polymerization.
In order to gain macromolecules, the synthesis of plastics is achieved by technical polymerization reactions.
Due to the resulting molecular chains one also speaks in this case of a chain growth reaction.
Plastic: Based on the
monomers Ethylen Polyethylen is created through polimerization.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Sep 22, 2019
The polymerization of propene produces the thermoplastic polypropylene (PP). It is a semi-crystalline polyolefin.
PP behaves very similar to PE, but is harder and more heat resistant.
With 0.89 – 0.92 g/cm³ PP has the lowest density, compared to the standard plastic materials.
The operating temperatures are between 0 and 100 °C.
The fatigue resistance is very high, therefore PP is well suited for use in hinges.
All these features make PP one of the most important plastics in the world today.
Even synthetic fiber production is largely based on PP.
Polypropylene is used primarily in packaging.
Further fields of application are household appliances, toys, sporting goods and agricultural equipment.
It has to be noted that PP is not very suitable for gluing and painting.
Plastic: Trash cans made of
polypropylene (
PP).
Related topics:
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
