Attached are the log decrement curves for PVC plasticized to varying degrees, as
ID: 1767093 • Letter: A
Question
Attached are the log decrement curves for PVC plasticized to varying degrees, as measured by a torsion pendulum at ca. 1 cycle/sec. The log decrement is log Ai/Ai+1 and is proportional to G"/G' or E"/E'.
1. a) If one wanted to use the PVC for seat coverings in an automobile that would remain flexible to -40 °C what amount of plasticizer should be used? Explain.
b) The seat coverings often become brittle with time, particularly in hot climates. Suggest and explain an explanation.
2.
One wishes to use PVC for floor tiles that would be flexible enough at room temperature to bend slightly when walked on. What minimum amount of plasticizer needs to be incorporated? Explain.
If one wanted the flooring to not crack when a weight is dropped on it, would one want to add more or less plasticizer? Explain.
2? 20 or3o 15 /40 80 20 10 10o 150 emperature - Figure 8.7. The logarithmic decrement ofpolyvinyl ehloride plasticized with various amouois of diHethylhexylphthaiate (aiter WolnExplanation / Answer
Amount of plasticizer does not have direct effect on the pvc. So any amount can be used.
This is due to temperature embrittlement. This can be controlled by adding tungsten in the actual material.
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