Preparation Of Functional Microspheres Of Maleic Anhydride And C₅Fraction By Meta-Stable Precipition Polymerization

Our country owns rich C₅resources. However, chemical utilization ofC₅resources has been low due to some technical reasons. We have synthesizedthe copolymers with the olefins of C₅fraction and maleic anhydride asmonomers via meta-stable precipitation polymerization. The polymerizationreaction medium plays a key role in the formation of meta-stable system, sowe first determine the reaction medium of the polymerization system. Theolefins of C₅fraction react with Maleic anhydride while the alkanes can beused as poor-medium of the polymerization system.Influences of solubility parameter monomer concentration monomerratio initiator species initiator concentration reaction time polymerizationtemperature stir and method of putting the maleic anhydride on polymerparticles morphology polymer particles size and size distribution and thepolymerization yield were reseached. The formation and growth mechanism of different morphology and particle size of copolymers were alsoinvestigated.under the same polymerization conditions, all the monoolefins anddiolefins in C₅fraction reacted separately with maleic anhydride bymeta-stable precipitation polymerization. Elemental analyses, FT-IR,13CP-MAS and SEM was used to analysis morphology and chemicalcomposition of the copolymer. It showed that1-pentene,2-methyl-1-butene,2-methyl-2-butene, cyclopentene, isopentadiene,1,4-pentadiene,1,3-pentadiene and dicyclopentadiene in C₅fraction reacted with maleicanhydride by meta-stable precipitation polymerization.