Non-toxic, biodegradable plastic resin promises cleaner construction materials
By Karen Sprey
January 25, 2011
Scientists from the University of Amsterdam (UvA) have developed a process for making fully biodegradable, non-toxic and non-hazardous thermoset resins from readily available, low-cost plant materials. It's hoped that this new range of plastics could be used for panels such as MDF in the construction industry and replace polyurethane and polystyrene packaging ... all without increasing cost or production times.
Most of the plastic products used in domestic products and the construction industry are thermosetting plastics; polymer materials that irreversibly cure.
They are made of three-dimensional networks of cross-linked polymers. Bakelite resin, produced from the reaction of phenol with formaldehyde, is one example, and the material is still used to bind wood fibers in pressed wood such as medium density fiberboard (MDF) and formica. Synthetic resins are also widely used in the construction industry for example in Medium Density Overlay (MDO), a combination of concrete and plywood, used in concrete molds.
Modern synthetic resins have a lot of negatives: they are made from diminishing fossil sources, are not biodegradable and can only be burned under strict conditions because they release toxic substances.
However, by combining plant materials and specific process conditions Professor Gadi Rothenberg and Dr. Albert Alberts of the University of Amsterdam's (UvA) Heterogeneous Catalysis and Sustainable Chemistry research group, have created a selection of bio-plastics ranging from hard foam material to flexible thin sheet materials.
Production time is comparable to current thermosetting processes, and the research team believe they can compete with existing plastics on price, but will need to manufacture on a larger scale to be certain.
A major plus is the availability and affordability of raw materials. Any plant materials can be used, for example grass, hay and trees.
Follow-up research will focus on new applications and process development and upscaling.