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Polymer degradation: Quiz

  

Question 1: ________ stabilizes the polymer by terminating the chain reaction due to the adsorption of UV light from sunlight.
MetabolismNutritionHuman nutritionAntioxidant

Question 2: Tiny traces of the gas in the air will attack double bonds in rubber chains, with ________, Styrene-butadiene rubber and NBR being most sensitive to degradation.
Natural rubberEnglandPolymerLatex

Question 3: The problem of ozone cracking can be prevented by adding anti-ozonants to the rubber before ________.
VulcanizationNatural rubberOlmecCross-link

Question 4: Polymeric ________ are very large (on the molecular scale), and their unique and useful properties are mainly a result of their size.
MoleculeNeutronAtomElectron

Question 5: The problem is known as stress corrosion cracking, and in this case was caused by ________ of the polymer.
AcidCelluloseHydrolysisCarbohydrate

Question 6: Polymers are susceptible to attack by atmospheric ________, especially at elevated temperatures encountered during processing to shape.
HeliumOxygenNitrogenHydrogen

Question 7: Ozone cracks were commonly seen in automobile ________ sidewalls, but are now seen rarely thanks to the use of these additives.
Parking brakeAirbagAutomobile safetyTire

Question 8: For example, polyethylene usually degrades by random scission - that is by a random breakage of the linkages (bonds) that hold the ________ of the polymer together.
MatterElectronAtomPhoton

Question 9: ________ has a relatively simple spectrum with few peaks at the carbonyl position (like polyethylene).
Polyethylene terephthalatePlasticPolystyrenePolypropylene

Question 10: The crutch had fractured across a polypropylene insert within the aluminium tube of the device, and ________ of the material showed that it had oxidised, possible as a result of poor moulding.
Infrared spectroscopyRaman spectroscopyRotational spectroscopyUltraviolet-visible spectroscopy
















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