Preventing Crystallization II

• An irregular repeat structure

  • Either from a single monomer that polymerizes several different ways (show polybutadiene structural options),
  • Else from a mixture of monomers (show EPR, SBR, NBR, FKM), that can polymerize in several ways
    • NR & cis-IR vs trans-IR vs random IR
    • Non-tactic repeat structure (atactic & isotactic PP)
    • Other elastomers (e.g. PPO, CO) where a randomized chiral center prevents crystallization. where a random tacticity can prevent crystallization