Microscopic Difference Analysis between PET and PETG
Thermal cracking,gas chromatography-mass spectrometry and DSC,TGA,DMA thermal analysis are performed on polyethylene terephthalate(PET)and polyethylene terephthalate 1,4-cyclohexanedimethanol ester(PETG)to explore their microscopic differences.The results showed that PET and PETG have many similar cracking products,and 1,4-dimethylcyclohexane is a unique cracking product of PETG;PETG has a cyclic structure and high steric hindrance.Compared to PET,PETG has a higher glass transition temperature and crystallization temperature,lower melting temperature,lower maximum weight loss rate temperature,lower storage modulus and poorer elasticity.PET and PETG are respectively used as reinforcement layers for self-adhesive polymer modified bitumen waterproofing membranes,and their mechanical properties show that the membrane made of PET as the reinforcement layer is superior to the membrane made of PETG.
PETPETGthermal crackingthermal analysismicro differences in gas chromatography-mass spectrometry
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