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Can Chain-Reaction Polymerization of Octadecyl Acrylate Occur in Crystal?
- Yao, Miao, Nie, Jun, He, Yong
- Macromolecules 2018 v.51 no.10 pp. 3731-3737
- X-ray diffraction, differential scanning calorimetry, molecular dynamics, polymerization
- Octadecyl acrylate was proven to exist in rotator phases, and the mechanism of its chain-reaction photopolymerization was revealed. The polymorphic behavior of octadecyl acrylate was studied by differential scanning calorimeter (DSC) and X-ray diffraction, which concluded that octadecyl acrylate exhibits two rotator phases (RII and RI), one orthorhombic crystal phase (Cₒᵣₜ), and one triclinic crystal phase (Cₜᵣᵢ) phase. The chain-reaction photopolymerization of four phases of octadecyl acrylate were studied by photo-DSC, and the theoretical possibilities of one-dimension chain propagation in RII, RI, and Cₒᵣₜ phases were analyzed by using the molecular dynamics simulation results. Combining the experimental and calculation results, the chain-reaction polymerization mechanism either intralayer or interlayer was discussed and disclosed. The question of whether the chain-reaction polymerization of octadecyl acrylate can occur in crystal was answered, and the reason was explained.