Biodegradation Polymers 36 Biodegradable plastics 29 Materials 25 Plastics 22 Environmental aspects 16 Biodegradable products 15 Organic compounds 10 Refuse and refuse disposal 9 Biopolymers 8 Fibrous composites 8 Mechanical properties 8 Biomass energy 7 Hazardous wastes 7 Biomedical materials 6 Composite materials 6 Fibers 6 Textile fibers 6 Anaerobic bacteria 5 Bioremediation 5 Deterioration 5 Polymers in medicine 5 Purification 5 Food 4 Lignocellulose 4 Lubrication and lubricants 4 Packaging 4 Plant litter 4 Polylactic acid 4 Sewage 4