English Abstract
Intercalation of Triazinethiol Molecules into Layered Double Hydroxide
and Their Crosslinking Property for Halogenated Rubber

Hidetoshi HIRAHARA
Department of Frontier Materials and Function Engineering, Graduate School of Engineering
Yoichi Akiba
Kunio MORI
Department of Chemical Engineering, Iwate University, Morioka, Iwate, Japan
Nippon Gomu Kyokaishi,(2006),79(5),261-266 Original Paper in Japanese

Intercalation products of crosslinking agents such as 6-R-1,3,5-triazine-2,4-dithiol monoanion (R is a substituent) into Mg-Al layered double hydroxide (RTD/LDH) have been synthesized with the calcination-rehydration reaction using Mg-Al oxide precursors calcined at 500 for 2 h. RTD/LDH has been modified by anionic surface active agent (AS/RTD/LDH). These organic-inorganic nanohybrids have been characterized by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. Vulcanization reaction of chlorinated acrylic rubber by AS/RTD/LDH has been investigated for the scorch time, the apparent cure rate constant and the induction period by a swing die rheometer at 170 . The basel spacing (003) was found to be 0.83 nm for the intercalated product of 1,3,5-triazine-2,4,6-trithiol monoanion (TT/LDH) and 0.81 nm for that of 6-dibutyl-1,3,5-triazine-2,4-dithiol monoanion (DB/LDH), 0.78 nm for the carbonate anion-intercalated LDH by XRD. The absorption peaks due to triazine ring (1580 cm) and methylene (2950 cm) were shown in the FT-IR spectrum of the TT/LDH and DB/LDH. These results indicate that TT or DB was intercalated into the LDH. The AS/RTD/LDH has shown the diffraction peak similar to the RTD/LDH. The induction period (t) was 0.7-1 min using 1,3,5-triazine-2,4,6-trithiol monosodium salt, in contrast to 10 min using AS/TT/LDH. The crosslinking of chlorinated acrylic rubber using the AS/TT/LDH showed a proper induction period.

(Received on September 30, 2005)

(Accepted on February 14, 2006)

Triazine thiol, Layered double hydroxide, Nanohybrid, Chlorinated acrylic rubber, Scorch time, Curing, Induction period