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Making PETG (Process (Step 1
esterification reaction of TPA, EG, and
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Making PETG
Process
Step 1
esterification reaction of TPA, EG, and
CHDM with catalytic organic tin (around 230
C under nitrogen atmosphere)
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Monomers, catalysts, and
antioxidants were premixed in an autoclave reactor, and the mixture was gradually
heated under constant stirring. # #
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Step 3
polycondensation of bis(hydroxyethyl)terephthalate (BHET) and bis(hydroxymethylcyclohexane)terephthalate (BHCT) carried out around 280 C under high-vacuum condition.
Step 4
At end of reaction, products in the melt
quenched into a water bath and followed by drying in a vacuum oven at room temperature for 48 hrs.
The monomer composition in the feed was varied from 0, 15,
30, 50, to 70 mol% of CHDM.
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Materials
Terephthalic acid (TPA) (99%),
ethylene glycol (EG) (99%),
1,4-cyclohexanedimethanol (CHDM) (99%)
solvents used for purification and
characterization,
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1,1,2,2-tetrachloroethane,
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Theory of Process
PETG, PCTG, and PCTA were coined to describe PET with 50% or less CHDM modification
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Key Pointers
partial replacement in the
polymerization feed of ethylene glycol by 1,4-cyclohexanedimethanol led to
statistically random PETG copolymers with adjustable compositions and suitable
molecular weights, which were thermally stable above 380 oC.
Poly(ethylene glycol-co-1,4-cyclohexanedimethanol
terephthalate) (PETG) is a modified PET