Trends in Biotechnology
ReviewDesigning Biobased Recyclable Polymers for Plastics
Section snippets
The Need of the Hour
At the start of 2018, the European Commission communicated ‘a European Strategy for Plastics in a Circular Economy’, emphasizing improved design and production of plastics and plastic products to facilitate reuse, repair, and recycling. It also noted the need to decouple plastic production from fossil resources and reduce greenhouse gas (GHG) emissions in line with the commitments under the Paris Agreement on Climate Changei. Even though plastics provide economic and environmental benefits
Plastics from Renewable Feedstock
The global production capacity of biobased plastics in 2018 was estimated at 2.11 million tons, of which 1.2 million tons were nonbiodegradable and the remaining biodegradableiii. The biodegradable products currently on the market are thermoplastic starch and several aliphatic polyesters, including poly(lactic acid) (PLA), polyhydroxyalkanoates (PHAs), and poly(butylene succinate) (PBS) (Table 1) [18]. PLA is by far the most commercially developed, having reached an annual production volume of
Industrial Biotechnology: The Key Enabling Technology for Biobased Plastics
Irrespective of the polymers being biodegradable or nonbiodegradable, or the feedstock used, industrial biotechnology is a key enabler for the production of most biobased plastics, starting from providing tools for the first step of biomass deconstruction to simpler entities, to the production of building blocks and also polymers 18, 22, 46, 47, 48, 49. Enormous efforts have gone into the screening and development of enzymes that hydrolyze the different components of the lignocellulosic biomass
Designing Biobased Polymers for Enhanced Performance
High performance biobased polymers with desirable material features that are retained even when subjected to processing and recycling, are in demand. The glass transition temperature (Tg) is one of the most important thermal properties of amorphous plastic materials, determining their physical, mechanical, and rheological properties and, hence, their range of applications, while the melting temperature, Tm, is important for semicrystalline plastics 86, 87. PET, the most widely recycled plastic,
Design for Enhanced Degradation
Although biodegradable plastics appear to be less favored than nonbiodegradable ones, biodegradability is a useful feature for certain applications where recovery of the plastics is difficult or impossible and leakage into the environment is difficult to avoid, such as in agricultural mulch films, fishing nets, or cosmetics. Biodegradability could also be used as a means to enable polymer recycling. However, a major bottleneck when designing degradable polymers is to achieve good properties and
Towards Recyclable Polymers and Monomers
In addition to mechanical recycling, there is increasing attention being paid towards developing technologies for recovering the building blocks from plastics for repolymerization to the original polymer or conversion to another product, in a process referred to as chemical recycling 3, 12, 133 (Box 2). The traditional process of chemical recycling by pyrolysis, in which plastics are subjected to high temperatures in the presence of a catalyst, gives a mixture of smaller molecules that are
Concluding Remarks and Future Perspectives
Plastic materials are crucial to modern life and society, and their continued importance in multiple applications is undisputed. Given the damaging environmental effects of the current linear plastics economy and also the future material demands for the growing global population (estimated to be 9 billion by 2050), a major shift to a sustainable plastics system based on renewable feedstocks and energy, and material recycling is essential [5]. Here, we argue that polymer design should be an
Acknowledgments
The authors are among the academic and industry representatives of a research program ‘Sustainable Plastics and Transition Pathways (STEPS) supported by the Swedish Foundation for Strategic Environmental Research (Mistra) L.J.N. also acknowledges funding from the EU Horizon2020 project REINVENT (No. 730053). Thanks are due to Smita Mankar and Adel Abouhmad for assistance with some tables and figures.
Glossary
- Amorphous polymers
- polymers with a random structure that do not have a sharp melting point and soften gradually with increases in temperature.
- Biobased plastics
- plastics comprising, wholly or a significant part thereof, renewable biological raw materials (such as plant, animal, and marine materials), including products and residues from agriculture and forestry.
- Biodegradable plastic
- a plastic that is broken down by microorganisms in the environment for use as a carbon and energy source.
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