Gareth Hughes announced yesterday that 3D printing/manufacturing was going to be something the Green Party can get behind. Â So much in fact, they made it part for the “blueprint” for the future.
So I though it would be a good opportunity to have a look and see why the Green Party has thrown away decades of opposition to oil exploration, oil extraction, oil refining, and of course the result of all this, plastics.
But not all plastics are created equal. Â Plastics are bad. Â As is oil. Â But somehone, “3D” plastics are not.
(Perhaps we need to invent 3D oil?)
Now, truth be known, not all plastics are created equal, and we have been educated to hate plastic bags, and those things that used to hold 6 cans together, because somewhere in the world a tortoise gets stuck in them. Â And who can argue with that. Â Tortoises don’t come in six packs.
For 3D printing, you need a plastic called “Thermoplastic”.
Acrylonitrile butadiene styreneÂ (ABS) (chemical formulaÂ (C8H8)xÂ· (C4H6)yÂ·(C3H3N)z) is a commonÂ thermoplastic. ItsÂ glass transitionÂ temperature is approximately 105 Â°C (221 Â°F).Â ABS isÂ amorphousÂ and therefore has no true melting point.
ABS is aÂ terpolymerÂ made by polymerizingÂ styreneÂ andÂ acrylonitrileÂ in the presence ofÂ polybutadiene. The proportions can vary from 15 to 35% acrylonitrile, 5 to 30%Â butadieneÂ and 40 to 60% styrene. The result is a long chain of polybutadiene criss-crossed with shorter chains of poly(styrene-co-acrylonitrile). TheÂ nitrilegroups from neighboring chains, being polar, attract each other and bind the chains together, making ABS stronger than pureÂ polystyrene. The styrene gives the plastic a shiny, impervious surface. The polybutadiene, aÂ rubberyÂ substance, provides resilience even at lowÂ temperatures. For the majority of applications, ABS can be used between â20 and 80Â Â°C (â4 and 176Â Â°F) as its mechanical properties vary with temperature.Â The properties are created byÂ rubber toughening, where fine particles of elastomer are distributed throughout the rigid matrix. — Wikipedia
You can see what set Gareth’s motor spinning. Â This isn’t “just plastic”, this is “amorphous” and who can resistÂ styrene-co-acrylonitrile? Â The Green Party certainly can’t. Â Read more »