Podcast Beta
Questions and Answers
The bonding between adjacent molecules is secondary bonding or Van der Waal forces of attraction. These can be weakened by ______
heating
Polymers are composed of a molecular structure built up chiefly from a large number of similar units bonded together, e.g. many synthetic organic materials used as plastics and resins. The molecular structure of plastics can be: ______ chain
Linear chain
Thermoplastics are composed of long chains produced by joining together monomers; they typically behave in a ductile manner. The chains may or may not have ______
branches
Thermosetting polymers are composed of long chains of molecules that are strongly cross-linked to one another to form three-dimensional network structures. Thermosets are generally stronger, but more brittle, than thermoplastics. They cannot easily be reprocessed after the cross-linking reaction has occurred and hence recycling is ______
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A substance which has a molecular structure built up chiefly or completely from a large number of similar units bonded together, e.g. many synthetic organic materials used as plastics and resins is called a ______
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