Can Chain-Reaction Polymerization of Octadecyl Acrylate Occur in Crystal?

Abstract

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 (<i>R</i><sub>II</sub> and <i>R</i><sub>I</sub>), one orthorhombic crystal phase (<i>C</i><sub>ort</sub>), and one triclinic crystal phase (<i>C</i><sub>tri</sub>) 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 <i>R</i><sub>II</sub>, <i>R</i><sub>I</sub>, and <i>C</i><sub>ort</sub> 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

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