| 1 | The biopolymer polyhydroxyalkanoate came next on the list. | |
| 2 | The main classes of materials are metals, polymers, ceramics , and composites. | |
| 3 | High-density polyethylene and low-density polyethylene were the second and third place polymers. | |
| 4 | Relation among chemical composition, physical structure, and mechanical behavior of plastics or synthetic high polymers. | |
| 5 | This liquid rubber can formed high polymer through the reaction of functional group to extend chain. |