Preparation Of Polyketone And Research On The Spinnability

Polyketone derived from copolymerization of carbon monoxide and ethylene is a semi-crystalline, thermoplastic material with good mechanical, heat and solvent-resistant properties. It is also widely used to make polymeric materials with various functionalities since great amount of carbonyl group structured can be active in reacting with other molecular groups. Carbon monoxide is cheaper to use in polymer synthesis compared with those made from petroleum. Recently, to make polyketone from carbon monoxide and ethylene attracts more and more attention, emphasizing on catalysts development in order to achieve higher catalytic activities, however, few attention has been paid to factors greatly influencing molecular weight of polyketone. In this thesis, these key factors are tested and discussed. Spinnability of polyketone is also studied under different polymerizing conditions to elucidate the relationship between the two.The copolymerizaton of carbon monoxide and ethylene is catalyzed by transition metal-Pd. The strictly-repeated units—(COCH₂CH₂)—are confirmed by IR characterization and elemental analysis. Factors influencing molecular weights are systematically studied by changing acid, acid amount, Pd : ligand ratios, solvent and its amount, reacting temperature and pressure. By solving polyketone in ZnCl₂ and CaCl₂ water solution, we examined the influence of metal salts' contents, molecular weight and concentration of polyketone on phase separation temperatures. We also evaluated the spinnability of polyketone by testing draw ratio and rheological parameters. The data shows there is a proportional relationship between spinnability and molecular weight. Heat-resistant ability is characterized by TG.