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