Technology

The perfect material for Tesla’s new cyberboat

It dissolves...but into what? Sounds like a recipe for a petroleum salt water mix that's probably just as toxic as melted plastic, unless all the petroleum is removed.

This sounds borderline miraculous, and I have a feeling there's bound to be a catch. I hope not, but I'm just too cynical.

I think some of y'all are missing a lot of packaging use cases other than food. But even in the food sector, there are dry things like pasta, beans, and rice that don't have salt in them. If it really is as strong as a petroleum plastic for these items, it could eliminate tons of micro plastic.

And are we gonna start using this on a mainstream scale?

The material can be used like regular plastic when coated,

Coated with what? If you say PFAS, this is worse than microplastics.

What does it dissolve into? 🪿 Wait, what does it dissolve into? 🗣️ 🪿

Aida said the new material is as strong as petroleum-based plastics but breaks down into its original components when exposed to salt.

If this means that it does not break down when exposed to just water, that's a pretty big deal. Water solubility has been the major issue making biodegradable plastics useless for food packaging (typically you want to either keep the food wet and water in, or dry and water out - either way water permeability is a problem).

Of course most foods also contain salt, so... I guess that's why the article talks about coatings. If the material has to be coated to keep it from breaking down too fast, what is the point? either the coating will prevent it from breaking down, or it just moves the problem to the coating not breaking down.

This seems like it could be a viable replacement for many plastics, but it isn't the silver bullet I feel that the article is acting as if it is.

From the linked article in the post:

the new material is as strong as petroleum-based plastics but breaks down into its original components when exposed to salt.

Those components can then be further processed by naturally occurring bacteria, thereby avoiding generating microplastics

The plastic is non-toxic, non-flammable, and does not emit carbon dioxide, he added.

This is great. Good stuff. Wonderful.

From another article (this shows that this isn't as recent, too. This news was from many months ago)

the team was able to generate plastics that had varying hardnesses and tensile strengths, all comparable or better than conventional plastics.

Plastics like these can be used in 3D printing as well as medical or health-related applications.

Wide applications and uses, much better than a lot of other proposed solutions. Still good so far.

After dissolving the initial new plastic in salt water, they were able to recover 91% of the hexametaphosphate and 82% of the guanidinium as powders, indicating that recycling is easy and efficient.

Easy to recycle and reclaim material from. Great! Not perfect, but still pretty damn good.

In soil, sheets of the new plastic degraded completely over the course of 10 days, supplying the soil with phosphorous and nitrogen similar to a fertilizer.

You could compost these in your backyard. Who needs the local recycling pickup for plastics when you can just chuck it in a bin in the back? Still looking good.

using polysaccharides that form cross-linked salt bridges with guanidinium monomers.

Polysaccharides are literally carbohydrates found in food.

This is really good. Commonly found compound, easy to actually re-integrate back into the environment. But now the problems start. They don't specify much about the guanidinium monomers in their research in terms of which specific ones are used, so it's hard to say the exact implications, but...

...they appear to often be toxic, sometimes especially to marine life, soil quality, and plant growth, and have been used in medicine with mixed results as to their effectiveness and safety.

I'm a bit disappointed they didn't talk about this more in the articles, to be honest. It seems this would definitely be better than traditional plastic in terms of its ecological effects, but still much worse than not dumping it in the ocean at all. In my opinion, in practice it looks like this would simply make the recycling process much more efficient (as mentioned before, a 91% and 82% recovery rate for plastics is much better than the current average of less than 10%) while reducing the overall harm from plastic being dumped in the ocean, even if it's still not good enough to eliminate the harm altogether.

Does it actually break down? Or does it just melt into a cloud of microplastics?

Let’s build a ship out of it.

You see the thing is, the point of plastic is that it doesn’t dissolve easily. I can see this having some niche applications, but this won’t be replacing most plastics any time soon.

So like, just with PFAS, the properties that make plastic so appealing are also what make it detrimental to the environment.

The only way to get rid of plastic is to stop valuing its use. We have to look at life differently, which in many ways is the same.

I hope they can tune it to react only to a very specific type of salt water range or else it will not be applicable very often.

And I love this. More if this please

So then what can it be used for, other than being decomposed? Doesn't almost all food contain salt, and human sweat as well? It's not really useful on earth then, is it? Maybe for unmanned spacecrafts?

Well, the dream material would be some that is stable during use and then immediately falls apart when disposed. But that's not how things usually work, so anything that decomposes fairly quickly cannot be used to store food for example, as it would just mix with the food. And anything that is stable enough to store food does not decompose in a hundred years or so.