The best replacement for polymers is monomers.

The best alternatives to polymers are rated as following:
★★★★★  monomers
★★★  plastics
★★★  metals
★  short chain polymers
★  macromolecules
★  elastomers
  copolymers
  synthetic polymers
  ceramics

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Speaking about polymers, one probably shouldn't forget about monomers.

Other search terms related to polymers and their ratings are:
★★★★★ monomers
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Google Trends

Scale is based on the average worldwide traffic of polymers in all years. Click on graph for more.
polymers
monomers
plastics