Barrier coatings for reducing microplastic release and chemical leaching in plastic containers.

When plastic containers degrade, they can release microplastics and endocrinedisrupting chemicals into their contents. This project investigated whether an
engineered silicone-based elastomeric barrier coating could reduce microplastic
release from plastic containers under simulated environmental stress conditions.
Identical 500 ml polyethylene terephthalate (PET) bottles were used, with some coated
internally and others left uncoated. Glass containers served as a control to establish
baseline contamination levels. Testing was conducted under two environmental
stressors: ultraviolet (UV) exposure and thermal stress. Water samples were
subsequently filtered using a vacuum filtration apparatus onto membrane filter papers
and analyzed under a compound light microscope.
Background-corrected results show that coated bottles released 100% fewer
microplastics than uncoated bottles under UV conditions, and 76.9% fewer under heat
conditions. Both fibers and fragments were identified, with uncoated samples
producing predominantly larger and longer fibers, while coated samples produced
shorter, finer particles — suggesting the coating interrupts surface fragmentation in
addition to reducing particle count.
These results are considered minimum estimates due to limitations including short trial
duration, inconsistent experimental conditions, 40× magnification limiting detection to
larger particles, and incomplete sample filtration. Despite these limitations, a clear and
consistent pattern emerged across both conditions. The coating shows significant
potential as a practical solution to reduce microplastic contamination from plastic
containers, with further research under more rigorous conditions recommended to fully
quantify its effectiveness.