DABCO- and DBU-intercalated α-zirconium phosphate as latent thermal catalysts in the copolymerization of glycidyl phenyl ether (GPE) and hexahydro-4-methylphthalic anhydride (MHHPA)

• Published in: Journal of molecular catalysis. A, Chemical Vol. 411; pp. 230 - 238
• Main Authors: Shimomura, Osamu, Nishisako, Takatoshi, Yamaguchi, Shunro, Ichihara, Junko, Kirino, Manabu, Ohtaka, Atsushi, Nomura, Ryôki
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2016
• Subjects: DABCO; DBU; Intercalation; Latent thermal catalyst; α-Zirconium phosphate; Intercalation; α-Zirconium phosphate; DABCO; Latent thermal catalyst; DBU
• ISSN: 1381-1169; 1873-314X
• DOI: 10.1016/j.molcata.2015.10.035

[Display omitted] •The latent catalytic abilities of DABCO- and DBU-intercalated α-ZrP were estimated.•Both intercalation compounds performed well as latent thermal catalysts.•In the case of α-ZrP·DBU the resulting products existed between the interlayers. The latent catalytic abilities of tertiary amines-intercalated α-zirconium phosphate [(α-ZrP·amine): 1,4-diazabicyclo[2,2,2]octane (α-ZrP·DABCO) and 1,8-diazabicyclo[5,4,0]undec-7-ene (α-ZrP·DBU)] were examined by copolymerization of glycidyl phenyl ether (GPE) and hexahydro-4-methylphthalic anhydride (MHHPA) at varying temperatures for 1h periods. Polymerization was not observed until the reactants were heated to 100°C or above. Upon increasing the temperature, the conversion factors of GPE increased such that, at 140°C, both conversions were over 90% for α-ZrP·DABCO and α-ZrP·DBU. The thermal stabilities of GPE and MHHPA with the catalysts at 40°C for 144h were tested: GPE with α-ZrP·DBU achieved conversions of 9%. The reaction in the presence of α-ZrP·DABCO did not proceed at 40°C for 144h.