NIPPON GOMU KYOKAISHI

Show abstractHide abstract

The introduction of carboxyl group onto the surface of furnace black or acetylene black by the reaction of 4, 4'-azobis (4-cyanopentanoic acid) (ACP) with these carbon black was investigated. During the reaction, 4-cyanopentanoic acid radical formed by the decomposition of ACP are found to be trapped on the surface. The amount of carboxyl group introduced onto furnace black, Philblack O, was determined to be 0.12mmol/g. The anionic ring-opening copolymerization of epoxides with cylic acid anhydride was initiated by potassium carboxylate (COOK) group introduced onto furnace black and acetylene black: the introduction of COOK group was achieved by the neutralization of carboxyl group with potassium hydroxide. In the copolymerization, polyester was effectively grafted onto the carbon black based on the propagation of polymer from COOK group on the surface: the percentage of grafting reached to about 40%. The rate of the copolymerization was accelerated by the addition of 18-crown-6. Furthermore, it was found that the rate of the polymerization and percentage of grafting of polyester increased with an increase in COOK group content of carbon black. Polyester-grafted carbon black obtained from the above polymerization produced a stable colloidal dispersion in organic solvents.

View full abstract

Download PDF (440K)

Novel open cell foam is fabricable by heating ethylene-vinyl acetate copolymer (EVA) with a foaming agent, crosslinking agent and also silicone compound under a normal atmospheric pressure. The effects of EVA and silicone compound on the cell structure of the fabricated foam were studied. It was observed that not only the use of EVA having the suitable flow property and of higher comonomer content but also that of silicone compound which made higher surface tension of polymer gave the foam having finer cell size and higher open cell content. The fabrication mechanism of the foam was conjectured qualitatively.

View full abstract

Register with J-STAGE for free!