Journal
MACROMOLECULAR RESEARCH
Volume 17, Issue 5, Pages 346-351Publisher
SPRINGER
DOI: 10.1007/BF03218873
Keywords
titanium alkoxide catalyst; silica support; polylactide; biodegradable polymer
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TiCl(O-i-Pr)(3)/SiO2 and Ti(O-i-Pr)(4)/SiO2 were prepared by immobilizing chlorotitanium (IV) isopropoxide (TiCl(O-i-Pr)(3)) and titanium (IV) isopropoxide (Ti(O-i-Pr)(4)), to pretreated silica. The effect of the polymerization reaction conditions on the catalytic activity and characteristics of the resulting PLA were investigated. The catalytic conversion, molecular weight and polydispersity index (PDI) of the PLA produced on the titanium alkoxide supported catalysts increased proportionally with the reaction temperature. When the PLA was synthesized in bulk polymerization, the PLA produced with the supported catalysts had higher molecular weight than those with homogeneous catalysts. The melting temperature of the polymer produced with silica supported alkoxide catalysts was approximately 170-180 degrees C.
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