Ftir Characterisation and Strength Performance of Degradable Additive Incorporated Polyethylene Terephthelate (PET) Bottle Upon Exposure to Different Environment
Effect of degradable incorporated masterbatch Polyethylene Terephthelate (PET) on strength and structural changes of PET upon exposure for highly demanded bottle packaging are investigated here. Bottle for beverages packaging normally use Polyethylene Terephthalate (PET) due to excellent characteristic such as neligible permeability to carbon dioxide, can withstand high temperature, non-toxic nature, high mechanical strength and transparency. Masterbatch of Polyethylene Terephthalate (PET) were injection moulded as preform and blow moulded in bottle manufacturing. Mechanical properties example tensile strength, elongation and modulus were tested before and after exposure towards three different conditions which are at room temperature, exposed to sunlight and in ridge; using two different filling liquid namely mineral water and coke. Bottles were exposure or four week period and result was taken. It was found that for PET filled mineral water the reduction of PET tensile strength was about 50% in strength of sample after exposed to sunlight after 4 weeks while in fridge, tensile was around 7.27 as compared to room temperature exposed PET is 11.96. Strength before exposure which is about 13.01 do not show much difference as compared to RT sample. Hence, condition of exposure did affect the strength performance. Sample of exposed PET towards sunlight has greater reduction in strength; presence of UV light from sunlight and cooling PET at low temperature was found to reduce strength. Temperature had an effect and exposure to low temperature is subjected to de-annealing process. Structural characteristic via Fourier Transform Infrared Spectroscopy (FTIR) was performs to investigate structural features of the molecular bond of degradable PET bottle. Greater intensity of aldehyde and ketone absorption were found for exposed bottle to sunlight compared to other conditioned bottle. For sunlight exposure, wavenumber were shifted to lower wavenumber from 1753 and 1614 to 1707 and 1577 cm-1.
Keywordsó Polyethylene Terephthalate (PET), Mechanical Strength, Fourier Transform Infrared (FTIR) Analysis.