The current issue of Business Week has a three-page rave on bioplastics: “I Have Just One Word for You: Bioplastics”. The deck on the story starts: “The scourge of indestructible garbage and sky-high oil are fueling interest in plastics from plants.” It turns out the story is really just a tout for startup company: Metabolix, which is developing a form of genetically engineered polymer that grows within plants. Very cool idea indeed. The rest of the bioplastics industry is largely dismissed by BW with the comment “rival bioplastics must be incinerated or composted at high temperatures.” The Metabolix plastic, trademarked Mirel, will decompose if it is simply tossed in a home compost heap or dumped at sea”. Wow, here we go again. To make this work, we have to dump our plastic waste in a compost heap in our backyard. Sure, some folks will try it – until their dog rolls in it or odors start to waft in the window on a hot summer night. In my view, that’s a pretty flimsy basis on which to start a new industry.
There are other issues:
Mirel will be produced in a new factory that uses corn as a feedstock. Microbes eat glucose in corn and convert the sugar to a polymer. Corn supplies are already strained by world food demands and ethanol. The BW story shows the inventor of Mirel with switchgrass and oilseed, revealing the promotional nature of the article. As noted here, the future of bioplastics will not be in food crop feedstocks.
The new polymer will be priced at $2 a pound, more than double the currently inflated price for the commodity plastics used in packaging. When the oil bubble bursts, as it always has, commodity plastics prices will tumble once again, while corn is unlikely to drop significantly.
There’s no mention in the article of how much energy it takes to produce Mirel – a major issue with ethanol-from-corn production.
There are some bright spots:
Maybe Mirel can be made some day from switchgrass and oilseed.
It seems to make a lot of sense for waste dumped at sea, and the U.S. military is studying use of the material as a liner that is thrown overboard.
I’m all for developing technology that solves the plastics’ hydrocarbon and solid waste issues. But we have seen too many hollow marketing promises with biodegradable plastics and not enough real technology. I applaud Metabolix, but really wish Business Week had put a little more effort into their report. .
If you’re truly concerned about climate change, do something meaningful: Turn off your air conditioning. Car pool. Support solar power.
HP revealed more of its 3D printing plans in a recent webinar. Senior vice president of inkjet and graphics solution business Stephen Nigro spoke about how the technology works and expanded on HP's vision of open collaboration to commercialize its Multi Jet Fusion 3D printing technology for end-production, and open collaboration on new materials. He also said HP will create software to help users decide when to use Multi Jet Fusion versus conventional subtractive manufacturing.
A lightweight electric urban concept car designed by several European companies weighs only 992 lb without its battery. It would have weighed 26.7 lb more if its windows were made of glass instead of the specially coated LEXAN polycarbonate resin from SABIC Innovative Plastics.
Skylar Tibbits' team in MIT's Self-Assembly Lab is now 4D printing self-assembling shapes made of programmable carbon composites and custom wood grain. The composites are being used in a sport car airfoil, and the wood grain is beautiful.
The NanoSteel Company has produced high-hardness ferrous metal matrix composite (MMC) parts using a new nanosteel powder in a one-step 3D-printing process. Parts are 99.9% dense, crack-free, and with wear resistance comparable to M2 tool steels.
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