|Synthesis of Butyl Rubber Containing 4-Vinylphenyl Group by Using Suzuki-Miyaura Coupling Reaction
Masumi SUZUKI 1
Tomoo SHIOMI 1
Kenji TAMAMITSU 2
Toshihiro KONDA 2
1 ; Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka, Niigata, Japan
2 ; Nippon Chemi-Con Corporation, Takahagi, Ibaraki, Japan
Nippon Gomu Kyokaishi,(2009),82(6),241-246 Original Paper in Japanese
Suzuki-Miyaura coupling reaction of brominated butyl rubber (BIIR) with 4-vinylphenylboronic acid were carried out in THF using cyclopalladated complex as catalyst. The degree of 4-vinylphenyl group introduction was estimated from the ratio of RI and UV peak area in the size exclusion chromatogram (SEC) of modified butyl rubber (St-IIR).
Considerable amount of 4-vinylphenyl group could be introduced to butyl rubber in the presence of small amount (Pd/Br≈1/1000) of Pd catalyst.
Quantitative analysis for the degree of 4-vinylphenyl group introduction was made by 1H-NMR. The exo methylene signals in BIIR decreased by the reaction whereas signals attributable to the viny protons of 4-vinylphenyl group increased with reaction time. When reaction was carried out in THF at reflux temperature for 12 h in the presence of 0.01 eq. of Pd catalyst, 4-vinylphenyl group was introduced quantitatively. The peroxide curing behavior of St-IIR was also examined.
(Received on November 26, 2008)
Brominated Butyl Rubber, Suzuki-Miyaura Coupling Reaction, 4-Vinylphenyl Group, Peroxide Curing