| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to a method of forming a high-efficiency catalyst based on a cationic complex of nickel for addition polymerisation of norbornene (NB). One of the modern trends in addition polymerisation of norbornene is production of high-purity polynorbornenes for optoelectronics, machine-building and medicine. There are high requirements for purity of polynorbornenes owing to the specific nature of fields of application. The method is realised by forming a norbornene polymerisation catalyst based on a cationic complex, where the complex used is nickel complex (O) Ni(COD)2 combined with boron trifluoride etherate (B) with ratio Ni:B ranging from 2 to 10, followed by addition of a monomer. Depending on the task, the reaction is carried out in toluene with different concentration of nickel and ratio Ni:B:NB and at temperature from 0 to 50C. The reaction product is polynorbornene which is soluble in cyclohexene, toluene, chlorobenzene and chloroform. The method enables to reduce the amount of boron compounds in the system by 200 times, while preserving high catalyst activity. ^ EFFECT: simple, cheap, intense method of producing a polymer and high purity of the end product. ^ 1 cl, 1 tbl, 1 dwg, 4 ex |
