10276polymersPT0000-00-00 00:00:00BT10292molecular compoundsPTNT11974addition polymersPTNT11972condensation polymersPTNT11971copolymersPTNT11970homopolymersPTNT11968natural polymersPTNT11967stereoregular polymersPTNT11969synthetic polymersPTRT10275plasticsPT