Tag Archives: Bioplastic

The Return of Bioplastics

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What’s old is new again

Was there a time when plastics were not made from petroleum? You wouldn’t know it from the plastics we’ve used – and unsuccessfully discarded in mass quantities – since the 1950s. But the origins of plastics were from plants. Indeed, one of the first plastics, cellophane, invented in 1900 (or 1908), was named for the plant fibers, cellulose, that it was made from. Henry Ford famously wanted to make a bioplastic car (made from hemp or soybeans, depending on who you ask) and even prototyped one. It would have been lighter and, he said, safer than metal cars and would have addressed a metal shortage during World War II.

Scotch tape made from cellulose/cellophane

Scotch tape was – and is – made from cellulose fibers. “Made of Cellophane” image: Wikipedia CC BY-SA 3.0

This month is Plastic Free July. There are many posts out there about what you can do. Just a few: Greenpeace, EcoWatch, MSN, Treehugger,  

But then the success of petroleum-based or synthetic plastics pushed bioplastics aside. Synthetic plastics became ubiquitous due to their affordability and unique properties. One of those properties is its durability, and the durability is both a positive and negative characteristic. The problem lies in its contemporary, perverse use for things that we’d rather not be durable. Most specifically, for single-use plastics: take-out containers, plastic bags, bottled water, six-pack rings. You get the idea. Why use a material that lasts for hundreds of years for something that is used for five minutes?

EcoOptimism has discussed the issue of single-use plastics for a while (here, here, and here) and, in fact, maintains a list of all the bans and fees on them in a database.

Which brings us to the return of bioplastics because, in addition to being made from renewable resources, many of them can decompose quickly. The issue – and the reason for the success of synthetic plastics – is that they are relatively expensive.

Bioplastics, we have to note, are not without controversy and some may not be the savior they are thought to be (and also here). Their claims about biodegradability may be suspect, and they don’t play nicely with other plastics if they get into the recycling stream.

That problem, along with the problem of cost, though, may be on the way out because newer ways to make it, going beyond the corn and potato starch methods, are being rapidly developed. Soooo… here is an accumulated synopsis of the most recent efforts. The fact that it’s so lengthy is testament to the vast potential.

It should be noted that in this era of shrinking demand for petroleum-based fuels, due to diminished travel in the pandemic among other factors, fossil fuel companies are gearing up to expand their production of plastics. The need for inexpensive plant-based plastic is more crucial than ever.

The COVID-19 pandemic has, as I’ve written about,  exacerbated the single-use plastic problem. Latex gloves, for example, can be found trashed everywhere. And just as plastic bags were being banned in many places, they’ve come back because they are perceived as more hygienic. But a recent statement signed by 125 health experts in 18 countries says that reusable bags are safe. No surprise that the Plastics Industry Association says single-use plastics are the only way to go.

The good news is that there’s a lot going on out there. The bad news is that it makes for a long post. But it’s worth it.

From The Guardian:
May 16, 2020
“The end of plastic? New plant-based bottles will degrade in a year Alternatives to Plastics”

EcoOptimism’s take: I’m starting off with this one because, first, it addresses one of the biggest sources of plastics pollution: soda bottles. Second, the materials they are sourcing from are the “usual suspects”: wheat and corn and some other foods such as beets.  The problem, as I note several times below, is that in many cases, these are food, so using them to make bioplastics can impact food supplies.

From EcoWatch:
May 6, 2020
“5 Sustainable Alternatives to Plastics”

EcoOptimism’s take: Olive pits, sunflower hulls, fish waste and algae, plant sugars, and mushrooms. It’s all good.

Bioplastics made from olive pits

Bioplastics made from olive pits. Source: Material Connexion

From Australian Geographic:
Nov 1, 2019
“Teen Invents Biodegradable “Plastic” That Decomposes In 33 Days Using Prawn Shells And Silk Cocoon Protein”

EcoOptimism’s take: A Sydney high school student invented this a science project after deciding to not use cornstarch because it would take away from food. “I was at the fish and chip shop getting prawns for dinner and noticed that the prawn shells looked like plastic. I went back to the lab and thought about what exactly made them look like that.”
Note: the original post that I saw this in, with the catchier headline above, seems to have disappeared, but this is the source.

High School student who made bioplastic from prawn shells

Image credit: Louise Kennerley via Australian Geographic

From Smithsonian Magazine:
Nov 14, 2019
“This Bioplastic Made From Fish Scales Just Won the James Dyson Award”

EcoOptimism’s take: More fish. Organic fish waste, to be exact. The inventor was, at the time, a 24-year old graduate student in England and won the prestigious James Dyson Award.

From CNN:
January 17, 2017
“Plastic you can drink: A solution for pollution?

EcoOptimism’s take: “The resulting “100% bio-based” material was biodegradable and compostable, breaking down over a period of months on land or at sea, or instantly in hot water. “I wanted to show this bioplastic would be so harmless to sea animals that a human could drink it,” he says. “I wasn’t nervous because it passed an oral toxicity test.”

“The entrepreneur launched a company in 2014 selling cassava-plastic ponchos. Today, Avani Eco produces four tons of material a day [with a capacity five times that] that is used for products including plastic bags, food packaging, and covers for hospital beds.”

From Labiotech:
Nov 20, 2019
“Spanish Researchers Produce Straws Made of Bacterial Bioplastic”

EcoOptimism’s take: Bacteria – the good kind

From Food Manufacture:
June 11, 2020
“EU-funded bioplastic developed”

EcoOptimism’s take: The cool part is that it’s “produced from industry by-products: cheese whey and micro-cellulose from almond shells,” and supposedly fully degrades within 90 days.

From FreshFruitPortal:
March 26, 2020
“New bioplastic developed from fruit residue in Chile”

EcoOptimism’s take: The important thing here is that it’s made from residue not the consumable food part of the plants, unlike this bioplastic made from rice.

From Bio Market Insights:
Feb 22, 2018
“Four years after launching, Tetra Pak’s bio-based packaging hits the half a billion unit mark”

EcoOptimism’s take: These Tetra Pak containers are made from 23% plastic, so on the one hand, converting that to a biopolymer made from sugar cane (which presumably is the edible part) makes sense. But on the other hand, they are still a multilayer composite that can’t be readily recycled – what McDonough and Braungart call a monstrous hybrid.

TetraPak container layers

image source: https://biomarketinsights.com/

Also from Bio Market Insights:
Dec 3, 2019
“Researchers develop banana waste-based bioplastic.”

EcoOptimism’s take: The fruit of the banana tree makes up just 12% of the plant and the rest is waste – or maybe now a byproduct to be made into a bioplastic. One has to cynically wonder, though, what happens if banana blight ruins the Cavendish banana crop.

From PlasticStar Material News:
Aug 22, 2019
“Bioplastic derived from cactus leaves

Photo: Sandra Pascoe Ortiz

And juice from the cactus as well:

From Fast Company:
June 20, 2019
“This new biodegradable plastic is made from cactus”

EcoOptimism’s take: While it’s fun to picture cactus farms, this plastic, unlike some others mentioned here, does use the edible (drinkable, that is) part of the cactus. That BBC video, by the way can be found here.

From New Atlas:
April 7, 2020
“Another possible use for coffee grounds: Biodegradable plastic’

EcoOptimism’s take: I know there’s a pun in there somewhere, but I’m not caffeinated enough to think of one.

The path from coffee grounds to plastic.

The path from coffee grounds to plastic. Image Credit: Yokohama National University.

From Vice:
July 30, 2019
“A Filipino Scientist Made Bioplastic Out Of Mango And Seaweed”

EcoOptimism’s take: Somehow, this article starts out by talking about tardigrades, which immediately caught my attention even though they seem to have nothing to do with the topic.

From Intelligent Living:
June 5, 2019
“Here’s A Truly Biodegradable Algae-based Bioplastic You Can Make At Home!no Scientist Made Bioplastic Out Of Mango And Seaweed”

EcoOptimism’s take: DO try this at home. And the hues come from fruits and vegetables.

Most plastics contain a polymer plasticizer (usually made from petroleum, often toxic) and a dye (usually synthetic). This one’s polymer is algae, the plasticizer is water and the dyes come from fruits and vegetables.

Cool translucent disks made from algae.

Cool translucent disks made from algae. Image source: Intelligent Living

From Fast Company:
Feb 10, 2020
“This biodegradable bioplastic sucks carbon from the air”

EcoOptimism’s take: This one takes us past the category of just avoiding petroleum-based plastics and into the topic of regenerative design: designs that not only “do less harm” but repair the damage the same time.

Plastic that detects spoilage

Plastic that detects food spoilage. Photo: Primitives

From Good News Network:
Feb 16, 2020
“Forget the ‘Best By’ Date; This Compostable Bioplastic Packaging Changes Color When the Food Goes Bad”

EcoOptimism’s take: Also in the category of bioplastics that go beyond just being more environmentally preferable than conventional plastics, this one can help with the major issue of food waste – alerting us when that stuff in the far reaches of the refrigerator needs to be consumed – or thrown out.

Believe it or not, there are bioplastics that didn’t make the cut here. But did you really want me to make this post even longer?

Plastics: A Combined Distillery and EcoOptimism Post, Part 2

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Beyond the Ban:
Plastics Alternatives and Mitigation

We can all use some positive news these days, especially on the environmental front in which science is considered evil, denial is an alternative fact and the EPA is now what I’m calling the Environmental Destruction Agency. And while I don’t want to gloss over the issues – there isn’t enough paint in the world to do that – I offer here The Distillery, a weekly (or thereabouts) selection of posts to help offset the PTSD of our current nightmare.

The posts I pick will be “real” in the sense that they aren’t pie-in-the-sky wishful thinking, as fun as those can be, but are evidence of EcoOptimism.

In just the short span since our recent post on the scourge of plastics, there have been more announcements of new or proposed bans on plastic straws and other types of plastics. (This week, Starbucks announced it will stop using plastic straws.) Rather than keep enumerating these individually, I’ve created a page, “Keeping Tabs on Plastics Bans,” with a list organized by type of entity – country, locality, company –  and type of plastics – bags, straws, packaging, microbeads. The list provides an easily graspable view of the extent of the movement, and will be updated as additional bans are set.

 

As promised in that previous post, we’re going to focus here a bit on some alternative proposals and materials. Dealing with plastics – as with most environmental issues – can be broken down into two approaches: what to do once the problem is happening versus how to prevent the problem in the first place. These are commonly referred to respectively as adaptation versus mitigation. Years ago, I also heard this described as “front of tailpipe” and “back of tailpipe,” the metaphor being pollution from cars, which can be dealt with either by filtering it in the exhaust pipe (that would be the “end of tailpipe”) by, for example, a catalytic converter, or by modifying the engine so that the pollution is prevented or at least diminished before it occurs. As you can imagine, heading off the problem is preferable to fixing it afterward.

In the case of plastics, we have a combination of damage already done along with a continuing stream of new plastics adding to the damage. Where plastic refuse has accumulated, such as in ocean gyres, the only remedy is to somehow, laboriously, retrieve it. Another adaptive after-the-fact approach is recycling. That at least keeps it out of the waste stream. (In theory, anyway. Less than 10% of plastic in the US is actually recycled. And, as others have noted, recycling shifts the responsibility – environmental and economic – from the actual producers of the plastic onto us, the consumers)

Image: Ocean Cleanup Project via EcoWatch

EcoOptimism’s take: Whether this type of ocean plastic reclamation would actually have a significant impact, given the scale of the problem and size of the oceans, is a topic of debate. But in any case, upstream prevention would be a much better solution, at least in terms of addressing a continuing problem.

The better solution would have been to not produce the plastic in the first place. We’re well beyond that option, obviously. But that doesn’t mean we shouldn’t attempt to avoid further exacerbating the problem through mitigation, meaning let’s not make more plastic if we can avoid it.

Plastic is so ubiquitous at this point that it’s hard to imagine a world without it. But there are indeed alternatives, both mitigative and adaptative.

Some of those solutions exist right in front of us, or at least in other places we can adapt from. A well-known one in some environmental circles is the Indian tiffin box. The tiffin involves a system in which lunches for workers and school children are packed at home in the morning and then distributed through a remarkable system by dabbawalas. The relevant idea here is that the home prepared meals arrive in tiffin boxes made of stacked metal dishes rather than disposable take out containers and, after the meal, are picked up and returned to each family’s kitchen for reuse.

Two dabbawalas in Mumbai delivering meals packed in tiffin carriers. Image credit: Wikipedia

This system has found a modern interpretation in Brussels where the city has introduced the Tiffin Project. People sign up for the project, purchase tiffin containers and bring them when they purchase take out foods. They even get a 5% discount on their orders.

From Treehugger
April 13, 2018

“Brussels has an ingenious solution to wasteful takeout containers”

EcoOptimism’s take: as optimistic as we like to be, it’s hard to imagine such a system succeeding here. As the Treehugger post notes, the system works best with small, local restaurants and “helps people discover new places to eat.” Takeout food in much of this country tends to come from large chains with familiar menus.

Tiffin boxes, if not the delivery system, have found their way west. You can even buy them on Amazon and elsewhere, with a Western interpretation:

A better-known example of a plastic substitute is, of course, the reusable cloth bag. They’ve become so ubiquitous that you’ll find them for sale (branded, of course) in all kinds of stores – not just the eco-oriented ones like Whole Foods, but conventional stores, too. And they’re an almost inevitable part of events. We have a (reusable) bag full of reusable bags that we’ve accumulated from fundraisers, trade shows and promotions. Too many, in fact.

Image credit: David Bergman

But there are times when a cloth bag just won’t cut it. For those, there are forms of plastic that are not made from oil and that can decompose after use.

The first plastics invented were made from plants. (The word cellophane refers to the fact that it was made of cellulose: plant fiber.) A famous photo shows Henry Ford swinging an axe against the bioplastic trunk of a Model T to show the material’s strength. (The axe was actually covered with fabric but made for an impressive display nonetheless.) As the story goes, he wanted to make his cars with bioplastic, but the steel industry had other ideas about that.

Image from HemmingsDaily

Bioplastics are getting renewed interest for applications such as plastic utensils made from potato starch. The main caveats here are how well they decompose or recycle and that the plant starches not be taken from foods. The solution to the latter is to use crop byproducts such as wheat chaff as opposed to the grain.

Image credit: www.ecoproducts.com

EcoOptimism’s take: In addition to the points above, bioplastics, for now, are not quite as versatile as synthetic plastics, but applications are broadening and have wide potential. 

But there’s now a renewed interest in bioplastics. A case in point:

From Engadget:
March 2, 2018

“Lego will soon make bricks out of sugarcane bioplastics”

EcoOptimism’s take: While it’s exciting to think that all those future Lego creations might not end up buried forever in landfills, this announcement is a bit misleading because, for now, it’s only Lego’s landscape elements, comprising about 1% – 2% of their production, not the iconic bricks.

But it’s not likely that all synthetic plastics can be substituted with bioplastics. And that leads us to a back-of-tailpipe types of mitigation. Among them are technologies that break down plastics.

From The Guardian:
April 16, 2018

“Scientists accidentally create mutant enzyme that eats plastic bottles”

Credit: Still image from video in The Guardian

From Grist:
March 2, 2018

“Mealworms munch on Styrofoam without dying, shock scientists”

Image credit: Geek.com

EcoOptimism’s take: In our Parsons School of Design Sustainable Systems course, we have the students try this out. Though they tend to be grossed out by the mealworms (see photo above!), they get to see that it actually works.

Still, these last two are after-the-fact approaches and, not to belabor the point, we’d be much better off not incurring the problem of more plastics on the first place.