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New plant-based plastics can be chemically recycled with near-perfect efficiency

academictimes.com

11–20 of 272 posts

Re: New plant-based plastics can be chemically recycled with near-perfect efficiency

#11
post #2

"Mobile phone case made with 3D printing, using recycled plastic." I do a lot of 3D printing and I always feel bad every time I have a bad print or design error and need to throw it in the trash. I really hope we can see some of these filaments on the market soon especially considering how popular 3D printing is becoming.

Agreed. If you print a dinosaur skull out of ABS, I wonder if the cast would survive longer than a real fossil.

Re: New plant-based plastics can be chemically recycled with near-perfect efficiency

#13

Plastic recycling seems heavily motivated by emotion and virtue signaling. In reality, only about 5% of our crude oil use goes towards plastic. If we rolled out EVs, and then just burned all the plastic trash (using waste-to-energy plants), we would still be far ahead. The biggest challenges with plastics are hormone disruption, and microplastics (particularly in the 3rd world without sufficient landfill or W2E infra…

? Oil being used to make plastics was never a problem.

Oil is not evil. It's the Co2 bit that's a problem.

The problem you missed was at least to some extent recycling: we can't reuse the material at all, and while theoretically burning is practical, we still don't separate everything and burning still leaves a byproduct that has to be buried.

I suggest the alternative is going to have to be something that truly disintegrates, i.e. more organic.

Re: New plant-based plastics can be chemically recycled with near-perfect efficiency

#14

Plastic recycling seems heavily motivated by emotion and virtue signaling. In reality, only about 5% of our crude oil use goes towards plastic. If we rolled out EVs, and then just burned all the plastic trash (using waste-to-energy plants), we would still be far ahead. The biggest challenges with plastics are hormone disruption, and microplastics (particularly in the 3rd world without sufficient landfill or W2E infra…

Plastic disposal is a clear example of the failure of current economics.

It's clearly bad for the environment and has long term costs, but there basically isn't any way economics to calculate that or incent it to not be done.

So IMO, recycling is an exploratory exercise in seeing if we can socially engineer behavior that is "better". The cynic would say "it doesn't", but I could argue civilization is built on short term economic calculations and resulting social/behavioral engineering that makes that impossible.

If there was any way to know, I'd be fascinated to see if there are real measurements in the drop in altruism, either from the psychological conditioning of our society, or making altruistic people less able to procreate.

Re: New plant-based plastics can be chemically recycled with near-perfect efficiency

#16

Plastic recycling seems heavily motivated by emotion and virtue signaling. In reality, only about 5% of our crude oil use goes towards plastic. If we rolled out EVs, and then just burned all the plastic trash (using waste-to-energy plants), we would still be far ahead. The biggest challenges with plastics are hormone disruption, and microplastics (particularly in the 3rd world without sufficient landfill or W2E infra…

Plastic disposal is a clear example of the failure of current economics. It's clearly bad for the environment and has long term costs, but there basically isn't any way economics to calculate that or incent it to not be done. So IMO, recycling is an exploratory exercise in seeing if we can socially engineer behavior that is "better". The cynic would say "it doesn't", but I could argue civilization is built on short t…

There definitely is a way to deal with this in economics: taxes. If you tax the companies making the plastics, the price will go up, and they have an incentive to do things differently.

Taxes are a crucial pillar of even a purely capitalist society, it’s just that they are not easy to implement politically.

Re: New plant-based plastics can be chemically recycled with near-perfect efficiency

#17
post #8
post #4

Earlier quoted context omitted.

PLA can be recycled with near perfect efficiency and is available today. Also it's extremely biodegradable so throwing it out isn't the end of the world.

PLA is pretty useless as a material though for anything but art. Almost everything I print has a functional purpose and either (a) needs mechanical strength (b) will be placed outdoors in the California sun or (c) will be used to house electronics that may reach temperatures as high as 70-80 C. PLA is basically useless to me and pretty much all roboticists. I use PETG for almost everything because it works perfectly…

I’ve just been living with the downsides of pla. Should I just switch to petg?

I have my printer in my bedroom though. Is petg toxi to breathe?

Re: New plant-based plastics can be chemically recycled with near-perfect efficiency

#18

Isn’t plastic in landfills actually a great way to sequester carbon?

It’s not really a benefit if the original carbon came from oil, because the carbon that was originally deep underground is now at the surface. If anything it’s only neutral, however the carbon emitted during oil extraction and the manufacturing process still results in a net negative.

Landfill isn’t the worst option, but it’s still better to try to avoid the manufacturing of it to begin with.

Re: New plant-based plastics can be chemically recycled with near-perfect efficiency

#19

Plastic recycling seems heavily motivated by emotion and virtue signaling. In reality, only about 5% of our crude oil use goes towards plastic. If we rolled out EVs, and then just burned all the plastic trash (using waste-to-energy plants), we would still be far ahead. The biggest challenges with plastics are hormone disruption, and microplastics (particularly in the 3rd world without sufficient landfill or W2E infra…

I wish there were more charities focused on building proper waste management infrastructure in developing countries. People don't want to support landfills and incineration, so they would rather support "clever" methods of collecting plastic in the ocean instead, which often end up in landfills anyways.

Re: New plant-based plastics can be chemically recycled with near-perfect efficiency

#20

Plastic recycling seems heavily motivated by emotion and virtue signaling. In reality, only about 5% of our crude oil use goes towards plastic. If we rolled out EVs, and then just burned all the plastic trash (using waste-to-energy plants), we would still be far ahead. The biggest challenges with plastics are hormone disruption, and microplastics (particularly in the 3rd world without sufficient landfill or W2E infra…

Do you have any source for the 5% stat? I don't mistrust you, but it would be nice to "see it with my own eyes" to be confident enough to use it in conversations with others.
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