期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 67, 期 46, 页码 12720-12729出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.9b04717
关键词
controlled release fertilizer; self-immolative polymer; biodegradation; poly(ethyl glyoxylate); microplastic; pH-responsive
资金
- Natural Sciences and Engineering Research Council of Canada [478981-15]
Many current controlled-release fertilizers (CRFs) are coated with nonbiodegradable polymers that can contribute to microplastic pollution. Here, coatings of self-immolative poly(ethyl glyoxylate) (PEtG) capped with a carbamate and blended with polycaprolactone (PCL) or poly(L-lactic acid) (PLA) were evaluated. They were designed to depolymerize and release fertilizers in the vicinity of plant roots, where the pH is lower than that in the surrounding environment. PEtG/PCL coatings exhibited significant temperature and pH effects, requiring 18 days at pH 5 and 30 degrees C, compared to 77 days at pH 7 and 22 degrees C, to reach 15% mass loss. Plant roots were also effective in triggering coating degradation. Spray-coating and meltcoating were explored, with the latter being more effective in providing pellets that retained urea prior to polymer degradation. Finally, PEtG/PCL-coated pellets promoted plant growth to a similar degree or better than currently available CRFs.
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