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packaging materials with desired mechanical and barrier properties and full chemical recyclability

by:SWIFT     2020-03-31
Plastics are already indispensable in modern life and have become the preferred material in packaging applications, but they also lead to an increasing accumulation of plastic waste in marine and landfill sites.
Although efforts have been made to develop biodegradable plastics, the mechanical and/or transport properties of these materials still need to be significantly improved to suit the replacement of traditional plastic packaging materials.
Here we report a bio-usable and degraded plastic based on γ-ketone polymer
Snail Ester and its ring-
Compared with the commodity polymer, the molten derivative products have competitive permeability and break elongation, and have excellent mechanical and transport properties compared to the most promising bio-based plastics.
It is important that the design of these materials has complete chemical recyclability and has ideal mechanical and barrier properties, thus representing the circular economy method of plastic packaging materials.
Plastic due to low cost, light weight, high performance, plus good processing performance, is the preferred material in packaging applications.
Plastic packaging production is expected to exceed 0. 25 billion tons by 2050.
Although most plastics used in the packaging industry are used for less than a week, one of the biggest assets of plastics-durability is leading to a huge increase in discarded plastics as contaminated waste.
This growth, as well as the vast majority of synthetic polymers, was designed for performance and durability, not for degradation and recyclability, resulting in millions of tons of plastic build-up in marine and landfill sites.
The main requirements of the materials used for packaging are good barrier properties, good mechanical properties and transparency for water vapor and oxygen;
Polymer therefore dominates the packaging market.
Nowadays, the most widely used material is poly (
Olefin such as polyethylene (PE)
And polypropylene (PP).
Even in the current recycling practice, it is estimated that after a short use, almost 95% of the value of plastic packaging materials will not be retained for subsequent use, causing a loss of 800-1200 billion dollars per year to the economy.
Several methods have been studied to solve the problem of this plastic packaging waste, such as designing highly selective catalysts and unique chemicals to effectively disaggregate plastic materials into building blocks or monomer, used for polymer or design additives to more effectively recycle the mixed PE and equilateral PP materials into materials of equal or possibly higher value.
In the short term, these methods may be part of a solution to reduce plastic waste, but in the long term, problems such as the economic feasibility of the process must be addressed, appropriate recycling strategies for recycled plastics must also be considered.
Another strategy developed over the past 20 years to address this issueof-
The life problem of packaging materials is the use of biodegradable polymers, such as poly-propylene ester (PLA)or poly(3-Dingone)(PHB)
It can be said to be two of the most successful and widely investigated examples.
Biodegradable polymer is an excellent alternative to traditional petroleum
Based on non-degraded plastics, because they come from biologically available sources, they can be degraded by enzymes or by hydrolysis, resulting in a closed circular ecosystem of the environment.
However, the high permeability of PLA and the poor mechanical properties of PHB (
Brittle material)
Coupled with their lack of a high degree of chemical recyclability, their potential is limited.
In addition to these methods, plastic designs that incorporate recyclability into their properties are considered to achieve full plastic recycling economy.
Through specially designed monomer, the direction of the monomer can be selected using reaction conditions
Polymer balance or closure-
Cycle chemical cycle.
Chemical recycling therefore provides an attractive alternative because polymer waste is used to obtain the monomer used for raw polymer reproduction, thus closing the cycle and recovering the economic value of the polymer after
Consumer goods.
Several chemical recyclable polymers, such as polyester, polyurethane and polyester, have recently been developed.
In these materials, based on Poly (γ-butyrolactone)(PγBL)
The core is very interesting because they are obtained using renewable resources and can be completely recycled back to the monomer.
In addition, as polyester, these materials have shown the ability to degrade by hydrolysis, which will not accumulate in the environment if the plastic is detached from classification and collection and has reached the end of life.
In this work, we investigate the potential of polyester based on the p γ bl core, which is specifically designed with full chemical recyclability built into its performance as a packaging application
First, we studied homopolymps, p γ bl, and poly (-
Six water)(PT6HP)
By measuring the permeability of these homopolymers to different gases and their mechanical properties, the potential of these homopolymers is preliminarily evaluated.
After these preliminary studies, we have specially designed a polymer, PT6HP--
P γ bl-with excellent barrier and mechanical properties comparable to commercial oil-
Base polymer for packaging and better than two of the most promising organisms-
To date, both PLA and PHB are polymer-based.
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