期刊
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
卷 14, 期 4, 页码 3073-3079出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2014.8591
关键词
Biodegrable Polymer; Poly(lactide); Late Transition Metal Catalyst; Surface Functionalization; Ring-Opening Polymerization
类别
资金
- Korea CCS RD Center (KCRC)
- Korean government (Ministry of Education, Science and Technology) [2011-0031981]
We report the in-situ synthesis of a late transition metal catalyst on amine-functionalized SBA-15 and amorphous silica and their ring opening polymerizations of L-lactide. Funtionalizations of SBA-15 and amorphous silica with N[3-(trimethoxysilyl)propyl]ethylenediamine (2NS) were carried out to in-situ synthesize late transition metal catalysts on the surface of nanoporous materials. FT-IR spectra indicates that the 1,2-dimethoxyethane ligand did not participate in the reaction when (DME)NiBr2 was immobilized on the amine-functionalized silica. In addition, the XPS spectrum confirmed the presence of Ni compound on the 2NS-functionalized SiO2. SBA-15/2NS/Ni and SBA-15/2NS/Pd catalysts showed higher conversion of PLA polymerization in comparison to SiO2/2NS/Ni and SiO2/2NS/Pd, respectively. The molecular weights of PLA produced by SBA-15/2NS/Ni or Pd were larger than those of SiO2/2NS/Ni or Pd, respectively. The effects of polymerization conditions such as the polymerization temperature, time, the catalyst amount in the feed, and the polymerization medium in L-lactide polymerization were also investigated.
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