@article { ISI:000323805300007,
	title = {Influence of method of preparation of solid, double-metal cyanide complexes on their catalytic activity for synthesis of hyperbranched polymers},
	journal = {Applied Catalysis A-General},
	volume = {464},
	year = {2013},
	month = {AUG},
	pages = {51-60},
	publisher = {ELSEVIER SCIENCE BV},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>Catalytic activity of a series of Fe-Zn double-metal cyanide (DMC) complexes with varying structural and acidic properties has been investigated for the synthesis of hyperbranched polyesters (HPs) from glycerol and succinic acid/adipic acid. The DMC complexes were prepared using different complexing and co-complexing agents. Hydrophobicity of the surface, Lewis acidity and micro-mesoporous architecture are the critical features of DMC enabled control on gelation process in preparing HPs of high degree of branching. The micro-mesoporous architecture of DMC acts as a nano-reactor for reactant molecules to form primary condensation products which further polymerize yielding dendrimers. Hyperbranched polyesters of degree of branching as high as 90\% could be achieved without gelation using DMC catalysts. (C) 2013 Elsevier B.V. All rights reserved.</p>},
	keywords = {Dendrimers, Double-metal cyanide, heterogeneous catalysis, Hydrophobic solid acid catalyst, Hyperbranched polymers},
	issn = {0926-860X},
	doi = {10.1016/j.apcata.2013.05.024},
	author = {Sebastian, Joby and Srinivas, Darbha}
}
@article { ISI:000334895800021,
	title = {Solid, double-metal cyanide catalysts for synthesis of hyperbranched polyesters and aliphatic polycarbonates},
	journal = {Journal of Chemical Sciences},
	volume = {126},
	number = {2, SI},
	year = {2014},
	note = {21st National Symposium on Catalysis (CATSYMP), CSIR Indian Inst Chem Technol, Hyderabad, INDIA, FEB 11-13, 2013},
	month = {MAR},
	pages = {499-509},
	publisher = {Catalysis Soc India},
	address = {C V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIA},
	abstract = {<p>Fe-Zn and Co-Zn double-metal cyanide (DMC) complexes exhibit highly efficient and selective catalytic activity for synthesis of hyperbranched polyesters (glycerol succinic acid (G-SA) and glycerol adipic acid (G-AA)) and aliphatic polycarbonates (via., alternative co-polymerization of cyclohexene oxide and CO2), respectively. The influence of method of preparation of DMC, in particular the mode of addition of reagents, on its physicochemical and catalytic properties was investigated. Co-Zn DMC was found highly selective for polycarbonate (than polyethers) formation. Catalysts prepared using tert-butanol and PEG-4000 as complexing and co-complexing agents, respectively, were found superior to those prepared without these agents. Apart from its role as a coordinating ligand, tert-butanol activated the Lewis acidic Zn2+ sites for reactions in polyester and polycarbonate formation. Hydrophobicity, micro-mesoporosity, acid strength and the amount of coordinated complexing agent are some of the crucial factors influenced the catalytic activity of DMC complexes.</p>},
	keywords = {aliphatic polycarbonate, CO2 utilization, Double-metal cyanide complex, heterogeneous catalysis, hyperbranched polyester},
	issn = {0974-3626},
	author = {Sebastian, Joby and Darbha, Srinivas}
}
