lezione4 Question Title * 1. which one of the following statement is true in a rubber compound higher frequency correspond to higher temperature in a rubber compound higher frequency correspond to lower temperature in a rubber compound higher frequency correspond to room temperature in a rubber compound higher frequency correspond to temperature lower than Tg. Question Title * 2. WLF shift factor at is an absolute number for all rubber depend on polymer type depend on filler loading depend on compound Tg Question Title * 3. during a rheometer test the t90 rubber curing time parameter is time needed to fully cure rubber compound a parameter to evaluate the scorch behaviour time required to achieve to 90% of max torque time required to achieve to a torque of 90 dN*m Question Title * 4. What does scorch mean? a curing phenomen which may occur during the rubber manifacturing process prior to the curing an heat up of the rubber due to the hysteresis during process a behaviour of the rubber which may reduce the srinking during extrusion the increase of the stiffness during the calendering process Question Title * 5. what we can retrieve by one sigle test by a rheometer? the moduus of the rubber the reaction behaviour of a rubber while curing the resilience of the rubber the rubber curing activation energy Other (please specify) Question Title * 6. which one of the following statement is true tand is reduced during curing tand is stable during curing tand is increasing during curing tand is reduced during curing and shear modulus is increasing Question Title * 7. Pasquale sta sulla sua auto e sa che quando la durezza del battistrada aumenterà di 10 punti sarà necessario cambiarle. Allora decide di fare test accelerato a temperature diverse ritenendo valida la legge di arrenius. per aumentare 10 punti di durezza a 80 gradi ci mette due settimanea 100 gradi 4 giornia 130 gradi un giornoPasquale is driving his car and he knows that when the hardness of the tread increases 10 points he will need to change them. For this reason he decides to forecast by accelerated testing carried out at different temperatures believing applicable arrhenius law.The increase of 10 points of hardness requiresat 80 degrees it takes two weeksat 100 degrees 4 daysat 130 degrees one day 2 anni 10 anni e 8 mesi 12 anni e 6 mesi 3 anni e 3 mesi 5 anni 5 anni e 7 mesi 6 anni e 3 mesi 4 anni e 2 mesi Other (please specify) Done