3 ms·

From the actual paper: "The resulting yield of PCB production was around 50%. Signal analysis was successful with analogue data acquisition (voltage) and low-fr

From the actual paper: "The resulting yield of PCB production was around 50%. Signal analysis was successful with analogue data acquisition (voltage) and low-frequency (4 kHz) tests, indistinguishable from sample FR4 boards. Eventually, the samples were subjected to highly accelerated stress test (HAST). HAST tests revealed limitations compared to traditional FR4 printed circuit materials. After six cycles, the weight loss was around 30% in the case of PLA/Flax, and as three-point bending tests showed, the possible ultimate strength (25 MPa at a flexural state) was reduced by 80%."[1] This sort of problem has come up many times with attempts to put some biological filler material into a composite. Most biological materials absorb and release water, and change size and weight as they do. This causes trouble for anything exposed to humidity changes. The classic "hemp/soybean car" ran into this problem.[2] In 1941, plastics were more expensive, and there were attempts to find some cheap material to use as filler. That never got beyond a prototype. Modern attempts at bio-composites seem to hit the same problem.[3] This might have potential for cheap disposable toys, where expected lifetime is in months and disposal as ordinary trash is desirable. [1] https://iopscience.iop.org/article/10.1088/1361-6528/ad66d3 https://iopscience.iop.org/article/10.1088/1361-6528/ad66d3 [2] https://en.wikipedia.org/wiki/Soybean_car https://en.wikipedia.org/wiki/Soybean_car [3] https://en.wikipedia.org/wiki/Biocomposite https://en.wikipedia.org/wiki/Biocomposite

userbinator 2y ago
This might have potential for cheap disposable toys, where expected lifetime is in months and disposal as ordinary trash is desirable. ...as if anyone wanted more of that.
- harvey9 2y ago
  I took it to mean they would be biodegradable.
  - hulitu 2y ago
    > I took it to mean they would be biodegradable. > I took it to mean they would be biodegradable. The only biodegradable materials are plants and animals. Plastic (however "green") is not. You still get small pieces of plastic from it.
    - harvey9 2y ago
      I believe that was the original point: these are plant-based materials so they absorb water which makes them unsuitable for PCBs
hulitu 2y ago
> The classic "hemp/soybean car" ran into this problem.[2] In 1941, Damn, I always thought that Cheech and Chong's hemp car was fiction.
- westurner 1y ago
  Ford hired George Washington Carver. They heated soybeans to develop a bioplastic. Soybean car > History, Internet video (of Rollins with a fireman's , Car ingredients: https://en.wikipedia.org/wiki/Soybean_car#Car_ingredients https://en.wikipedia.org/wiki/Soybean_car#Car_ingredients : > The exact ingredients of the plastic are not known since there were no records kept of the plastic itself. Speculation is that it was a combination of soybeans, wheat, hemp, flax and ramie. Lowell Overly, the person who had the most influence in creating the car, says it was "...soybean fiber in a phenolic resin with formaldehyde used in the impregnation." [16] What are the binders for aerospace -grade hemp plastic these days? I don't think that formaldehyde is required anymore. Hempitecture has salt-treated fire retardant hemp batting home insulation product which competes with fiberglass and cellulose batting and fill, and cork. FWIU treated polyurethane foam (like old seat cushions) absorbs oil (OleoSponge), Kestrel has a modern vehicle made of hemp plastic. Name of the 75% hemp aircraft made by Hempearth scientist from Canada doing engineering in the US: Radar (ROC curve in ML, too) and these days Infrared signatures for hemp vehicles and crafts: Hemp plastic would have been an advantage in WWII if: These days many major auto manufacturers use hemp parts in production automobiles for its durability, cost, and sustainability in terms of carbon cost for example. Hemp bast fiber competes with graphene in ultracapacitor anode applications, and IDK why not normal capacitors and batteries too. Hemp anodes are possibly more sustainable than graphene anodes (in supercapacitors and solid state batteries) due to the environmental and health hazards of graphene production and the relative costs of production. YouTube has videos of hemp batteries; batteries made of hemp. https://www.youtube.com/results?sp=mAEA&search_query=hemp+battery https://www.youtube.com/results?sp=mAEA&search_query=hemp+ba... Dimensional Hemp Wood lumber is real, and it is a formaldehye-free sustainable binder FWIU. So - and this is what Kestrel and Hempearth are going for - it's probably possible to make closer to 100% of a vehicle or an aircraft with biocomposites inspecific or even hemp-only.
  - 1y ago

userbinator 2y ago

This might have potential for cheap disposable toys, where expected lifetime is in months and disposal as ordinary trash is desirable. ...as if anyone wanted more of that.

harvey9 2y ago
I took it to mean they would be biodegradable.
- hulitu 2y ago
  > I took it to mean they would be biodegradable. > I took it to mean they would be biodegradable. The only biodegradable materials are plants and animals. Plastic (however "green") is not. You still get small pieces of plastic from it.
  - harvey9 2y ago
    I believe that was the original point: these are plant-based materials so they absorb water which makes them unsuitable for PCBs

hulitu 2y ago

> The classic "hemp/soybean car" ran into this problem.[2] In 1941, Damn, I always thought that Cheech and Chong's hemp car was fiction.

westurner 1y ago
Ford hired George Washington Carver. They heated soybeans to develop a bioplastic. Soybean car > History, Internet video (of Rollins with a fireman's , Car ingredients: https://en.wikipedia.org/wiki/Soybean_car#Car_ingredients https://en.wikipedia.org/wiki/Soybean_car#Car_ingredients : > The exact ingredients of the plastic are not known since there were no records kept of the plastic itself. Speculation is that it was a combination of soybeans, wheat, hemp, flax and ramie. Lowell Overly, the person who had the most influence in creating the car, says it was "...soybean fiber in a phenolic resin with formaldehyde used in the impregnation." [16] What are the binders for aerospace -grade hemp plastic these days? I don't think that formaldehyde is required anymore. Hempitecture has salt-treated fire retardant hemp batting home insulation product which competes with fiberglass and cellulose batting and fill, and cork. FWIU treated polyurethane foam (like old seat cushions) absorbs oil (OleoSponge), Kestrel has a modern vehicle made of hemp plastic. Name of the 75% hemp aircraft made by Hempearth scientist from Canada doing engineering in the US: Radar (ROC curve in ML, too) and these days Infrared signatures for hemp vehicles and crafts: Hemp plastic would have been an advantage in WWII if: These days many major auto manufacturers use hemp parts in production automobiles for its durability, cost, and sustainability in terms of carbon cost for example. Hemp bast fiber competes with graphene in ultracapacitor anode applications, and IDK why not normal capacitors and batteries too. Hemp anodes are possibly more sustainable than graphene anodes (in supercapacitors and solid state batteries) due to the environmental and health hazards of graphene production and the relative costs of production. YouTube has videos of hemp batteries; batteries made of hemp. https://www.youtube.com/results?sp=mAEA&search_query=hemp+battery https://www.youtube.com/results?sp=mAEA&search_query=hemp+ba... Dimensional Hemp Wood lumber is real, and it is a formaldehye-free sustainable binder FWIU. So - and this is what Kestrel and Hempearth are going for - it's probably possible to make closer to 100% of a vehicle or an aircraft with biocomposites inspecific or even hemp-only.
- 1y ago