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Stretching Polymers

Stretching Polymers. JJS. L.O.s. ALL Will carry out an investigation into the behaviour of polymers under loading. MOST Will be able to describe the limitations of polymers strength. Will be able to give a basic explanation of the micro-structure of a typical polymer OR draw it. SOME

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Stretching Polymers

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  1. Stretching Polymers JJS

  2. L.O.s • ALL • Will carry out an investigation into the behaviour of polymers under loading. • MOST • Will be able to describe the limitations of polymers strength. • Will be able to give a basic explanation of the micro-structure of a typical polymer OR draw it. • SOME • Will be able to relate the structure of a polymer to its physical strength.

  3. What are polymers like? • Polymers are made of long carbon chains. • They are a little bit like micro-elastic bands themselves. • In a polymer they are bundled together. • Sometimes chemicals/heat are used to cross-link these bundles to make the polymer tougher or more rigid.

  4. Elastic band investigation • PUT ON GOGGLES/SPEX to protect your eyes! • CLAMP your stand to the bench so it does not TOPPLE • Hang an elastic band from a the clamp. • Measure the length of the band and record it in a table. • Add a weight (100g ≡ 1N, Newton) • Measure the new length and record it. • Repeat until the band will not stretch any more!

  5. Results table & analysis • Use a table like this to record your results • Now plot a points/scatter graph of this data

  6. Analysis 2: Conclusion Q’s • Did you get a straight line or a curve? • What does this tell you about the polymer as you put more load on it? • Did your band break? Why? • Explain (using a diagram) what is happening to the polymer molecules inside the band, as you added more load.

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