Study On Plasma Copolymerization Of CO₂(CH₄) With Styrene And Its Application To Polymer Blending

Both carbon dioxide and methane have a rich storage in the world, which are two of the key gases causing greenhouse. And reasonable conversion of carbon dioxide and methane may not only lead to efficient resource utilization but also protect environment. Plasma technology as an unconventional method has been widely used in the study on the conversion of carbon dioxide and methane. In this thesis, the study on the rules of polymerization of carbon dioxide and methane plasma with styrene under glow discharge and dielectric-barrier discharge (DBD) are provided, and the two discharge methods are applied to blend polymerization for the preparation of polypropylene/polystyrene alloy. Since many physical phenomenon are involved in the DBD and glow discharge, the analysis on related problems are involved for better understanding of polymerization mechanism. Online detection of voltage and current during the process of DBD and glow discharge comes true in this thesis. The polymerization of carbon dioxide plasma and methane plasma with styrene plasma under glow discharge is studied. The solution experiment, FTIR and XPS of polymer show that there exist C-O, C=O and OH in the polymer structure produced by polymerization of carbon dioxide with styrene, and no cross-link polymer may be prepared under suitable discharge conditions. The polymer of methane copolymerization with styrene is cross-link style, and based on the structure of polymer, the mechanism of collision reaction among active particles is studied. Styrene polymerization by DBD plasma of carbon dioxide and methane are investigated respectively. The study on XPS and FTIR show that there exist C=O in carbon dioxide initiation polymerization of styrene, and the polymer is no cross-link. The polymerization of methane initiation styrene contained C=C, and it is no cross-link too. The mechanism of plasma initiation polymerization was the type of free radical. Polypropylene/polystyrene alloy is prepared with the usage of plasma technique and melt blend. The comprehensive study with FTIR, XPS, XRD, SEM and DSC analysis show that dispersion phase particle size is effectively reduced and the homogeneity of alloy is improved.