Synthesis and pyrolysis of ABC type miktoarm star copolymers with polystyrene, poly(lactic acid) and poly(ethylene glycol) arms

Date

2012-10-01

Author

Ozlem, Suriye
Iskin, Birol
Yilmaz, Gorkem
Kukut, Manolya
Hacaloğlu, Jale
Yagci, Yusuf

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An ABC type miktoarm star copolymer possessing polystyrene (PS), poly(lactic acid) (PLA) and poly(ethylene glycol) (PEG) arms was synthesized by combining Atom Transfer Radical Polymerization (ATRP) and Ring Opening Polymerization (ROP) with two click chemistries, namely thiol-ene and copper catalyzed azide-alkyne cycloaddition (CuAAC). For this purpose, a core 1-(allyloxy)-3-azidopropan-2-ol with allyl and azide functionalities was synthesized in two steps. Then, clickable polymers, polystyrene with thiol functionality (PS-SH) and poly(ethylene glycol) with alkyne functionality (PEG-acetylene) were independently prepared. As the first step of the grafting onto process, PS-SH was thiol-ene clicked onto the core to yield PS-N-3-OH. The second arm was then incorporated onto the core by the Ring Opening Polymerization (ROP) of 1-(-)-Lactide (LA) using as PS-N-3-OH initiator and tin(II) 2-ethylhexanoate as catalyst. Finally, alkyne-PEG-acetylene was bonded to the resulting PLA-PS-N-3 using CuAAC click reaction. All intermediates, related polymers at different stages and final PS-PLA-PEG miktoarm star copolymer were characterized by H-1 NMR, FT-IR, SEC and DP-MS analyses. Direct pyrolysis mass spectrometry, (DP-MS) analyses of PS-PLA-PEG and all intermediate polymers indicated that the decomposition of PS and PEG chains occurred almost independently, following the degradation mechanisms of the corresponding homopolymers. On the other hand, during the pyrolysis of PS-PLA-PEG, elimination of H2O during the decomposition of PEG chains at the early stages of pyrolysis caused hydrolysis of PLA chains and increased the yields of CO2, CO and units involving unsaturation and/or crosslinked structure.

Subject Keywords

Miktoarm star copolymers, Polystyrene, Poly(lactic acid) poly(ethylene glycol), Direct pyrolysis mass spectrometry

URI

https://hdl.handle.net/11511/30827

Journal

European Polymer Journal

DOI

https://doi.org/10.1016/j.eurpolymj.2012.07.014

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

S. Ozlem, B. Iskin, G. Yilmaz, M. Kukut, J. Hacaloğlu, and Y. Yagci, “Synthesis and pyrolysis of ABC type miktoarm star copolymers with polystyrene, poly(lactic acid) and poly(ethylene glycol) arms,” European Polymer Journal, pp. 1755–1767, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30827.