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Star-Shaped and Linear POSS-Polylactide Hybrid Copolymers

Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
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Academic Editor: Naozumi Teramoto
Materials 2015, 8(7), 4400-4420; https://doi.org/10.3390/ma8074400
Received: 9 June 2015 / Revised: 6 July 2015 / Accepted: 13 July 2015 / Published: 17 July 2015
Novel octakis-2[(6-hydroxyhexyl)thio]ethyl-octasilsesquioxane (POSS-S-OH) as well as heptaisobutyl-2[(6-hydroxyhexyl)thio]ethyl-octasilsesquioxane (iBu-POSS-S-OH) were synthesized. POSS structures, bearing both types of groups i.e., 2[(6-hydroxyhexyl)thio]ethyl and the vinyl ones, pendant from the octahedral cage are also described. The synthetic pathway involved thiol-ene click reaction of 6-mercapto-1-hexanol (MCH) to octavinyloctasilsesquioxane (POSS-Vi), and heptaisobutylvinyloctasilsesquioxane (iBu-POSS-Vi), in the presence of 2,2′-azobisisobutyronitrile. The functionalized silsesquioxane cages of regular octahedral structure were used further as initiators for ring opening polymerization of L,L-dilactide, catalyzed by tin (II) 2-ethylhexanoate. The polymerization afforded biodegradable hybrid star shape and linear systems with an octasilsesquioxane cage as a core, bearing polylactide arm(s). View Full-Text
Keywords: functionalized POSS; thiol-ene addition; star-shaped polymers; organo-inorganic hybrid polymers; polylactide functionalized POSS; thiol-ene addition; star-shaped polymers; organo-inorganic hybrid polymers; polylactide
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Rozga-Wijas, K.; Stanczyk, W.A.; Kurjata, J.; Kazmierski, S. Star-Shaped and Linear POSS-Polylactide Hybrid Copolymers. Materials 2015, 8, 4400-4420.

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