thermosoftening polymers can be used to make plastic bottles and food packaging

1) the reaction to produce polymers uses a catalyst

why does the catalyst work for a long time before it needs replacing

2) thermosoftening polymers would not be suitable for packaging very hot food

explain why in terms of their properties and structure

Question

22-11-2014
Chemistry

Answered

thermosoftening polymers can be used to make plastic bottles and food packaging

1) the reaction to produce polymers uses a catalyst

why does the catalyst work for a long time before it needs replacing

2) thermosoftening polymers would not be suitable for packaging very hot food

explain why in terms of their properties and structure

Verified Answer :

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BeckaH BeckaH · Answer 1 · 2014-11-22T13:22:00-05:00

1) Catalysts help to facilitate a reaction by lowering activation energy, but are not used up in this reaction. Eventually, however, they will need replacing as they become less efficient.
2) Thermosoftening polymers only hold their rigid shape in cooler conditions, if hot food is placed in them the polymer will soften (effecively melt). This is because there is little attraction between the polymer chains in a themosoftening polymer so they move easily when heat is added.

CaptainAstar CaptainAstar · Answer 2 · 2014-11-22T14:25:49-05:00

CaptainAstar CaptainAstar

22-11-2014

1) catalysts are not used up in reactions
2) thermosoftening polymers have weak intermolecular forces which quickly makes them melt and break away from bonds holding them together.

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