In order to reduce the pollution of waste plastics to the environment and alleviate the energy crisis, degradable plastics have been developed to replace ordinary plastics. Biodegradable plastics are plastics that cause degradation by the action of microorganisms such as bacteria, molds (fungi) and algae present in the natural environment.
Degradable plastic/layered montmorillonite nanocomposites
At present, the commonly used degradable materials mainly include natural substance degradable materials, microbial synthetic degradable materials and chemical degradable materials. Natural substances mainly include starch, cellulose and chitin; Microbial synthesis is mainly polyhydroxyalkanate(PHA)and polylactic acid(PLA); Chemical synthesis is mainly polycaprolactone (PCL), polybutylene succinate (PBS), polyvinyl alcohol (PVA), etc. However, these materials have mechanical properties, unstable thermal stability, fast loss of strength, poor toughness and other shortcomings, which restrict their application.
Montmorillonite belongs to a 2:1 layered clay mineral, which is an expandable layered aluminosilicate inorganic substance formed in nature, with strong stiffness and no slippage between layers. Through ion exchange reaction, organic cations are introduced into the montmorillonite layer, so that it is hydrophilic to hydrophobic, improving its compatibility with organic phase, and increasing the spacing of montmorillonite layers, which is conducive to the intercalation composite of polymers, so that silicate sheet layers and degradable polymer materials can achieve nano-scale composite to form intercalated or peel-off nanocomposites. The nanocomposite polymer material has excellent strength, dimensional stability and thermal stability of clay minerals, as well as the fracture property, processability and dielectric properties of polymers.
Product performance indicators:
PLA/lamellar montmorillonite nanocomposites, PHA/lamellar montmorillonite nanocomposites, PBS/lamellar montmorillonite nanocomposites, PCL/lamellar montmorillonite nanocomposites, PVA/lamellar montmorillonite nanocomposites.
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