Prevulcanization of isoprene rubber latex

• Published in: Colloid and polymer science Vol. 293; no. 5; pp. 1457 - 1464
• Main Authors: Sae-heng, Kewwarin, Iso, Noriaki, Kosugi, Kenichiro, Kawahara, Seiichi
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2015; Springer Nature B.V
• Subjects: Carbon; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Constants; Food Science; Infrared radiation; Isoprene rubber; Joining; Latex; Linking; Nanotechnology and Microengineering; Original Contribution; Physical Chemistry; Polymer Sciences; Soft and Granular Matter; Spectroscopy; Isoprene rubber; NMR; Prevulcanization; Kinetics; Activation energy
• ISSN: 0303-402X; 1435-1536
• DOI: 10.1007/s00396-015-3513-z

Prevulcanization of isoprene rubber (IR) latex was investigated by latex-state 13 C-NMR spectroscopy to understand its mechanism in latex stage. The prevulcanization was carried out at 50 to 90 °C with sulfur (S) and zinc-dibutyldithiocarbamate (ZDBC) as vulcanizing agents. The prevulcanized IR latex was subjected to latex-state 13 C-NMR spectroscopy. The signal at 44 ppm was assigned to secondary carbons adjacent to carbons linking to S atoms, whereas the signal at 58 ppm was assigned to tertiary and quaternary carbons linking to S atoms. The time evolution of the small signals at 44 and 58 ppm was investigated at various temperatures, and kinetic constants were determined at each temperature. The activation energy of the prevulcanization of IR latex was estimated from the kinetic constants to be about 80 kJ/mol.