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.
Keywords— Polyethylene Terephthalate (PET), Mechanical Strength, Fourier Transform Infrared (FTIR) Analysis.