PET to PETG Conversion: Difference between revisions
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=Useful Links= | =Useful Links= | ||
*[https://en.wikipedia.org/wiki/Polyethylene_terephthalate The Wikipedia Page on PET Plastic | *[https://en.wikipedia.org/wiki/Polyethylene_terephthalate The Wikipedia Page on PET Plastic] | ||
*[https://en.wikipedia.org/wiki/Polyethylene_terephthalate#Copolymers The Wikipedia Page on PETG] | *[https://en.wikipedia.org/wiki/Polyethylene_terephthalate#Copolymers The Wikipedia Page on PETG] | ||
*[https://hackaday.com/2019/01/29/plastics-petg/ A Hackaday Article on How this is done Industrially] | *[https://hackaday.com/2019/01/29/plastics-petg/ A Hackaday Article on How this is done Industrially] | ||
*[https://www.filaments.directory/en/plastics/petg An Webpage from the site "Filaments.Directory" on PETG] | |||
Revision as of 14:38, 16 April 2020
Basics
- Pet (Plastic) is a common plastic, mainly found in disposable water bottles
- HOWEVER it is very moisture sensitive, and doesn't lend itself to fdm 3d printing
- PETG however is reletively in between PLA and ABS and is a great fdm plastic
- As of now this page is for research on how to convert pet to petg, and see if it can be done economically
- Calling all chemists!
Methods
- Technically speaking PETG is a Copolymer of PET and Cyclohexanedimethanol(CHDM)
- From the Filaments article:
- The first step in PETG synthesis is esterification of TPA, EG and CHDM at around 230 in a nitrogen atmosphere, this is when the first polycondensation reaction occurs in the presence of a metal catalyst, usually cobalt. The second polycondensation step is carried out at high temperature (usually around 280) under high vacuum conditions
- Seems like it will be makerspace and up level due to the need for nitrogen gas, and a vacuum