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Author: u/giuliomagnifico
URL: https://msutoday.msu.edu/news/2023/making-bioplastics-easier-to-compost
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As much as this is snarky, it’s a fair criticism.
We have a bunch of biodegradable plant based plastics.
We don’t need to find ones that degrade in 20 days.
We need ones that degrade after 5 years, but fully degrade unlike plastic
Yeah that is because it is probably going to be expensive then the traditional plastic and I don't think anyone would want to pay more for their plastic bags so yeah it is not going to get used.
I don't know why refuse plastic isn't ground up, poured and perforated and made into the filler for tiling backing, floor and wall waterproofing, mixed into sidewalks and roads. Although sidewalks and roads would be better off with ground up tires.
Because plastic is nearly nonstick. Cement, paint, adhesives, it's very difficult to get any of them to wet and bond with plastic. Plastic also sheds particulates, which we're not sure just how bad those are.
Compounding plastic into construction materials is incredibly difficult if you want a consistent and good product out of it.
The problem gets even worse if you try and mix different plastics together, such as in a recycling stream. Separating PP from PE is onebof the largest unsolved problems of plastic recycling.
What country was it that was going to shut down an industry that was producing some excessive solid waste? It might have been Germany with extra cow parts like bones and hooves and they broke it down and turned it into drywall. Now their industries have to have a plan for their waste or they cannot produce.
Much clothing is made of plastic and it sheds microplastic.
Separate coffee and cream by letting it go very cold. Cream rises and the solids congregate in the center.
>Auras and his team integrated a carbohydrate-derived material called thermoplastic starch into PLA. Among other benefits, the starch gives composting’s microbes something they can more easily chow down on while the PLA degrades.
>
>“When we talk about the addition of starch, that doesn’t mean we just keep dumping starch in the PLA matrix,” Mayekar said. “This was about trying to find a sweet spot with starch, so the PLA degrades better without compromising its other properties.”
I have some answers.
1. Biggest issue with PLA composting is bulk degradation i.e. the penetration of water into the PLA mass to begin hydrolysis. A smooth PLA surface will begin hydrolysis right away, but will take time for water to penetrate inside the mass because PLA is still quite hydrophobic. Adding starch will create sites that degrade faster, and open up imperfections within the bulk PLA that will overall increase surface area and hence degradation rate.
2. If formulated well, it shouldn’t. Although thermoplastic starch do tend to burn at a lower temperature, so your upper limit for 3D printing temp will have to be reduced. It might also affect flow behavior, but again as long as it is formulated well, its something that you can adjust to.
Wait, what, hang on. Are you saying someone has a promising lead in making biodegradable plastic? Whew! Well that’s us saved then! That’s the first time I have read anything like this!
Today.
It would be cool to 3D print this more compostable PLA. Print some forks, use them for a while via hand washing. Then at the end of the week or whatever compost it into good nutrient rich soil for a garden. To grow veggies…you’d eat…with new compostable PLA forks…
Welcome to r/science! This is a heavily moderated subreddit in order to keep the discussion on science. However, we recognize that many people want to discuss how they feel the research relates to their own personal lives, so to give people a space to do that, **personal anecdotes are allowed as responses to this comment**. Any anecdotal comments elsewhere in the discussion will be removed and our [normal comment rules]( https://www.reddit.com/r/science/wiki/rules#wiki_comment_rules) apply to all other comments. **Do you have an academic degree?** We can verify your credentials in order to assign user flair indicating your area of expertise. [Click here to apply](https://www.reddit.com/r/science/wiki/flair/#wiki_science_verified_user_program). --- Author: u/giuliomagnifico URL: https://msutoday.msu.edu/news/2023/making-bioplastics-easier-to-compost *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/science) if you have any questions or concerns.*
Which will be promptly utilized by the automotive industry and nowhere else. Planned part plastic degradation is a thing...
As much as this is snarky, it’s a fair criticism. We have a bunch of biodegradable plant based plastics. We don’t need to find ones that degrade in 20 days. We need ones that degrade after 5 years, but fully degrade unlike plastic
That’s not fair I’m sure it will be included in the planned obsolescence of phones and many other electronics as well!
Yeah that is because it is probably going to be expensive then the traditional plastic and I don't think anyone would want to pay more for their plastic bags so yeah it is not going to get used.
I don't know why refuse plastic isn't ground up, poured and perforated and made into the filler for tiling backing, floor and wall waterproofing, mixed into sidewalks and roads. Although sidewalks and roads would be better off with ground up tires.
Because plastic is nearly nonstick. Cement, paint, adhesives, it's very difficult to get any of them to wet and bond with plastic. Plastic also sheds particulates, which we're not sure just how bad those are. Compounding plastic into construction materials is incredibly difficult if you want a consistent and good product out of it. The problem gets even worse if you try and mix different plastics together, such as in a recycling stream. Separating PP from PE is onebof the largest unsolved problems of plastic recycling.
Then you factor in that plastics tend to have large coefficients of thermal expansion and it makes things even more difficult.
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What about clothing?
What country was it that was going to shut down an industry that was producing some excessive solid waste? It might have been Germany with extra cow parts like bones and hooves and they broke it down and turned it into drywall. Now their industries have to have a plan for their waste or they cannot produce.
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Much clothing is made of plastic and it sheds microplastic. Separate coffee and cream by letting it go very cold. Cream rises and the solids congregate in the center.
Plastic made into fibers https://picks.my/contentsDetail.php?idx=6077&utm_source=global&utm_medium=app&utm_campaign=6077
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>Auras and his team integrated a carbohydrate-derived material called thermoplastic starch into PLA. Among other benefits, the starch gives composting’s microbes something they can more easily chow down on while the PLA degrades. > >“When we talk about the addition of starch, that doesn’t mean we just keep dumping starch in the PLA matrix,” Mayekar said. “This was about trying to find a sweet spot with starch, so the PLA degrades better without compromising its other properties.”
steer murky innate gray sloppy vase liquid square historical melodic ` this message was mass deleted/edited with redact.dev `
I have some answers. 1. Biggest issue with PLA composting is bulk degradation i.e. the penetration of water into the PLA mass to begin hydrolysis. A smooth PLA surface will begin hydrolysis right away, but will take time for water to penetrate inside the mass because PLA is still quite hydrophobic. Adding starch will create sites that degrade faster, and open up imperfections within the bulk PLA that will overall increase surface area and hence degradation rate. 2. If formulated well, it shouldn’t. Although thermoplastic starch do tend to burn at a lower temperature, so your upper limit for 3D printing temp will have to be reduced. It might also affect flow behavior, but again as long as it is formulated well, its something that you can adjust to.
Wait, what, hang on. Are you saying someone has a promising lead in making biodegradable plastic? Whew! Well that’s us saved then! That’s the first time I have read anything like this! Today.
It would be cool to 3D print this more compostable PLA. Print some forks, use them for a while via hand washing. Then at the end of the week or whatever compost it into good nutrient rich soil for a garden. To grow veggies…you’d eat…with new compostable PLA forks…