Researchers at TU Berlin are researching to replace plastics from petroleum - with the help of bacteria.

Waste Fats: Raw Material for Alternative PHA

A timid approach to dealing with plastic plague is PHA (polyhydroxyalkanoates). They are biopolymers and are used widely as they are like plastic from fossil fuels.

"Half of the two million tons of bioplastics that are currently produced worldwide per year are not biodegradable and the other half are sometimes difficult to," says Riedel. Therefore, a need arises for alternative PHA based on other raw materials.

The raw material can be obtained from many substances like corn, sugar, glycerine or palm oil. Sebastian L. Riedel and Stefan Junne, however, had a basic product that does not pollute the climate and is not food or feed such as corn as such a source material is considered problematic.

In the search for an alternative, they decided waste fats among other things, which are incurred, inter alia, in agriculture (animal carcasses), in catering or in the processing of food waste. Trash and leftovers for others but valuable raw materials for the scientists.

Oxy-gas Bacteria for Converting Waste into PHA

The accomplishable bacteria called Ralstonia eutropha or Cupriavidus necator, also known as oxyhydrogen bacteria. We let them 'piss us off' for us, " laughs Riedel.

The Process:

• The bacteria are kept in a mineral salt solution, fed with nitrogen, phosphorus, oxygen and carbon
• The carbon is added in the form of waste fats
• Then the bacteria are left to grow
• After a certain time, the nitrogen is removed from the bacterial culture
• They respond to this deficiency by investing the excess carbon in the waste fat as an energy reserve in their cells and converting it into PHA
• Then the PHA produced in the cells is extracted with the help of solvents, some of which can be recovered after the process
• If nitrogen is given back after a certain period, the bacteria would first use the intracellularly stored PHA as an energy source, hence it should not be done

The researchers are working on alternative refurbishment methods that will make the process more cost-effective and sustainable in the long term.

Renouncement of Research With Palm Oil

Dr.-Ing. Incidentally, Sebastian L. Riedel began his research on palm oil with PHA ten years ago in the United States at the Massachusetts Institute of Technology (MIT). "This is a super uncomplicated starting material for the production of the substance," says Riedel.

But the palm oil plantations are tackling the rainforest. When he came to the TU Berlin in 2012, he discontinued his research on palm oil. "Replacement found for plastic, cutting down rainforest - that cannot be the result of research," Riedel explains his decision.

Since 2017, Riedel has been expanding its PHA research with biogenic residues at the Department of Bioprocess Engineering, which is committed to the development of sustainable bioprocesses.

Source: TU Berlin

New Biomass-derived PC Composite to Replace BPA-based Polycarbonates

Researchers from Korea Research Institute of Chemical Technology have made a new, tough, transparent Polycarbonate composite reinforced with two biomass derived alternatives isosorbide and cellulose nanocrystals replacing both BPA and glass fibers.

These Polycarbonate sheets have outperformed traditional BPA-reinforced polycarbonate plastic in strength tests and can replace BPA-based polycarbonates in a variety of common applications.

The research team was led by Sung Hwang, Dongyeop Oh and Jeyoung Park from the Korea Research Institute of Chemical Technology.

Safer Alternatives for BPA

Polycarbonate is a popular shatter-resistant alternative to glass in windows, display screens, bottles and optical fibers. However, polycarbonate plastics are frequently made using bisphenol A (BPA) and glass fibers.

BPA is an endocrine disruptor increasingly associated with regulations – Canada, the EU and the US Food and Drug Administration have banned BPA in baby bottles with the EU also banning BPA in food packaging – as well as health risks. And in the event of a fire, glass fibers generate fine particulates that can cause respiratory problems.

Scientists are therefore searching for safe alternative components that improve the transparency, and mechanical and thermal properties of polycarbonates like BPA and glass fibers do.

Properties of New Composite

Isosorbide already features in pharmaceuticals and cosmetics, and has a high thermal stability.

The research team first dispersed the cellulose in isosorbide and used an insitu polymerization to produce their composite. Cellulose disperses evenly throughout the material and only 0.3wt% is needed. The final material is stronger than BPA-based controls, with a tensile strength of 93MPa. The new composite was also highly transparent – transmitting 93% of light at 500nm.

‘The excellently dispersed cellulose nanocrystals minimally interfere with visible light and the synergetic interaction between the polymer and the filler reduces the microbubbles in the matrix, which can induce light scattering,’ commented Park.

Park and his colleagues attribute the synergistic interactions and high miscibility between the isosorbide and cellulose moieties to ‘the principle of like-dissolves-like’ as they are both derived from glucose and have ether linkages.

Applications of New Biomass-derived PC Composite

This Glucose derived polycarbonate plastic could be used in:

• optical fibers
• safer glazing plastics
• baby bottles

Stephen Miller, Sustainable Plastic Expert from University of Florida, said ‘the majority of bio-based polymers are interesting primarily because they are bio-based; it is the exception that they possess properties that surpass those of fossil fuel-based materials. That one polymer nanocomposite can accomplish all this is quite noteworthy.’

Source: Chemistry World

New Method to Develop Terpenes-based Sustainable Polymers for 3D Printing & Medical

Scientists at the University of Birmingham have developed a way of making organic polymers from the fragrant molecules found in conifers and fruit trees. The technique could lead to a new generation of sustainable materials for use in biomedical applications or 3D printing prototyping.

Molecules called as terpenes are found in the essential oils of a wide variety of plants and are often used in fragrances, cosmetics and other household products. Terpenes can also be used to produce resins.

Combining Terpenes & Thiols to Develop Light Activated Resins

In order to find a way to produce sustainable polymers, researchers have devised a technique for extracting the terpenes molecules and converting them into stable resins. By combining them with sulfur-based organic compounds called thiols, the resins can be activated by light to form a solid material.

Processing the terpenes in this way makes them particularly useful in a 3D printing process called stereolithography, where objects are built up in multiple layers and fused together under UV light to form 3D objects.

Lead author, Professor Andrew Dove, explains: “We need to find sustainable ways of making polymer products that do not rely on petrochemicals. Terpenes have been recognized as having real potential in this search and our work is a promising step towards being able to harness these natural products.”

Different terpenes produce different material properties and the next step for the team is to investigate those properties more fully to better control them. Although the fragrances are not key to the terpenes’ material properties, researchers are interested to see if they can also be harnessed in some products.

Their results are published in Polymer Chemistry.

Source: University of Birmingham

Haydale awarded funding to develop gas tanks for spacecraft propulsion systems

Haydale, a global advanced materials group, has been awarded a contract by the European Space Agency (ESA), which is seeking to develop non-metallic gas tanks for spacecraft propulsion systems in a technology de-risking project.

The demand for small satellite launches has created a challenge within the existing space propulsion supply chain for low-cost reliable components. With the constellation market set to increase rapidly, the development of components that meet these criteria is critical. Haydale's non-metallic system offers a low-cost alternative with reduced lead time that can be offered in a wider range of configurations to exactly suit the end user requirement.

Haydale will formulate and model a largely de-risked tank, prior to the manufacture of development models for full testing. This will result in the qualification for specific Spacecraft Propulsion Systems.

Prominent producers of Satellite technology have been identified and are engaged in developing the specification and tank design for eventual manufacture and deployment. 

Haydale will be working alongside ISP International Space Propulsion Ltd through ESA Artes Competitiveness & Growth, in conjunction with UK Space Agency.

Source:www.haydale.com

New Two-step Process Turns Toxic FRs to Carbon Dioxide and Water

A team of environmental scientists from the University of Massachusetts Amherst and China has for the first time used a dynamic, two-step process to completely degrade a common flame-retardant chemical, rendering the persistent global pollutant nontoxic.

New Process to Breakdown Common FR TBBPA

This new process breaks down tetrabromobisphenol A (TBBPA) to harmless carbon dioxide and water. The discovery highlights the potential of using a special material, sulfidated nanoscale zerovalent iron (S-nZVI), in water treatment systems and in the natural environment to break down not only TBBPA but other organic refractory compounds that are difficult to degrade, says Jun Wu, a visiting Ph.D. student at UMass Amherst’s Stockbridge College of Agriculture and lead author of the paper published in Environmental Science & Technology.

Oxic and Anoxic Process

“This is the first research about this dynamic, oxic/anoxic process,” Wu says. “Usually, reduction or oxidation alone is used to remove TBBPA, facilitated by S-nZVI. We combined reduction and oxidation together to degrade it completely.” Wu emphasizes that “the technique is technically simple and environmentally friendly. That is a key point to its application.”

Feasible Process to Degrade Refractory Brominated FRs

“This research can lead to a decrease in the potential risk of TBBPA to the environment and human health,” says Wu, who began the research at the University of Science and Technology of China in Hefei. At UMass Amherst, Wu works in the pioneering lab of Baoshan Xing, professor of environmental and soil chemistry, corresponding author of the new study and one of the world’s most highly cited researchers.

“Our research shows a feasible and environmentally friendly process to completely degrade refractory brominated flame retardants in a combined oxic and anoxic system,” Xing says. “This is important for getting rid of these harmful compounds from the environment, thus reducing the exposure and risk.”

More Research Needed to Best Apply the Process

Among the most common flame retardants that hinder combustion and slow the spread of fire, TBBPA is added to manufactured materials, including computer circuit boards and other electrical devices, papers, textiles and plastics.

Associated with a variety of health concerns, including cancer and hormone disruption, TBBPA has been widely detected in the environment, as well as in animals and human milk and plasma.

Although Wu and Xing’s research breaks new ground in the efforts to develop safe and effective processes to remediate groundwater and soil contaminated with TBBPA, they say more research is needed to learn how to best apply the process.

Source: University of Massachusetts Amherst

Another Milestone in my Consulting service

Another Milestone in my service:

Have started discussions with various State Governments (more than 10 states so far) for adding FRP and Polymeric products in the Government projects (Construction,Electrical,Automotive,Agriculture,Medical,Railways etc).It's been a good start and have started meeting both officials and ministries this month.The talks were encouraging me to offer business consulting service to the players in Indian market.

Interested product manufacturers can approach me with your private message on Linkedin/rosaram211@gmail.com to move proceed and expand your business activities in Indian market.