Multi-arm star polymers of lactide obtained in melt in the presence of hyperbranched oligoglycerols

Anna Kundys , Andrzej Plichta , Zbigniew Florjańczyk , Agnieszka Zychewicz , Paulina Lisowska , Paweł Parzuchowski , Edyta Wawrzyńska

Abstract

Multi-arm star poly(l-lactide) (PLLA) was synthesized in bulk, via ring-opening polymerization of l-lactide initiated by: trimethylolpropane, pentaerythritol, dipentaerythritol, myo-inositol and hyperbranched polyglycerols. The synthesis was carried out on a laboratory scale and also in a model research installation equipped with a 2 L polymerization reactor. Matrix-assisted laser desorption ionization time-of-flight analysis of the products synthesized in the presence of simple polyols and tin 2-ethylhexanoate revealed that the reactions were not entirely selective and the final products were a mixture of multi-arm star, linear and cyclic PLLA. The reactions co-initiated by polyglycerols (PGs) led to polymer mixtures with molar masses in the range 13.5-102 kgmol(-1) and intrinsic viscosity significantly lower than that of linear PLLA with the same molar mass. In order to obtain more hydrophobic PG initiator, a suitable method of modification of PG structure was developed. The PG and modified PG branching agents were used to prepare multi-arm star PLLA in the model semi-technical installation. Molar masses of the resulting polymers were in the range 169-249 kgmol(-1) and exhibited much lower intrinsic viscosity than the linear homologue. The rheological properties of synthesized materials with commercial PLLA blends as well as thermal and mechanical properties were analysed. (c) 2016 Society of Chemical Industry
Author Anna Kundys KChTP
Anna Kundys,,
- Chair Of Polymer Chemistry And Technology
, Andrzej Plichta KChTP
Andrzej Plichta,,
- Chair Of Polymer Chemistry And Technology
, Zbigniew Florjańczyk KChTP
Zbigniew Florjańczyk,,
- Chair Of Polymer Chemistry And Technology
, Agnieszka Zychewicz KChTP
Agnieszka Zychewicz,,
- Chair Of Polymer Chemistry And Technology
, Paulina Lisowska KChTP
Paulina Lisowska,,
- Chair Of Polymer Chemistry And Technology
, Paweł Parzuchowski KChTP
Paweł Parzuchowski,,
- Chair Of Polymer Chemistry And Technology
, Edyta Wawrzyńska KChTP
Edyta Wawrzyńska,,
- Chair Of Polymer Chemistry And Technology
Journal seriesPolymer International, ISSN 0959-8103
Issue year2016
Vol65
No8
Pages927-937
Publication size in sheets0.5
Keywords in Englishpolylactide; hyperbranched polyglycerol; star polymers; melt viscosity
DOIDOI:10.1002/pi.5126
URL http://onlinelibrary.wiley.com/doi/10.1002/pi.5126/abstract
Languageen angielski
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Score (nominal)35
ScoreMinisterial score = 30.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.07 (2) - 2016=2.135 (5)
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