Supramolecular interactions involving fluoroaryl groups in hybrid blends of polylactide and ladder polysilsesquioxanes

Polymer Testing

卷:94

Agata S. Herc¹  Joanna Bojda²  Marcin Palusiak²  Joanna Sołtysiak²  Anna Kowalewska²  Ewa Piorkowska²  Ewa Markiewicz³  Artur Różański⁴  Paweł Ławniczak⁵  Maria Nowacka⁵ 

[1] Corresponding author.;

[2] Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363, Łódź, Poland;

[3] Department of Physical Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163/165, 90-236, Łódź, Poland;

[4] Industrial Chemistry Research Institute, Rydygiera 8, 01-793, Warsaw, Poland;

[5] Institute of Molecular Physics Polish Academy of Sciences, Smoluchowskiego 17, 60-179, Poznan, Poland;

关键词: Polylactide;    Polysilsesquioxanes;    Supramolecular interactions;    Quantum-chemical modelling;    Dielectric relaxation;    Barrier properties;   

DOI  :  

来源: DOAJ

【 摘 要 】

Linear ladder polysilsesquioxanes (LPSQ-R) bearing fluoroaryl groups [R: p-fluorophenyl (F), p-trifluoromethylphenyl (F3) or pentafluorophenyl (F5)] were used to modify polylactide (PLA). Vibrational spectroscopy analysis suggested specific, non-covalent interactions between CO of PLA and fluoroaryl groups of LPSQ-R while quantum-chemical modelling performed for representative models indicated that the pattern of possible preferred contacts differs for LPSQ-F3 in respect to LPSQ-F and LPSQ-F5 (H····F hydrogen bonding against n→π* attractive interactions). It may affect interface phenomena in PLA/LPSQ-R systems. Thermal characteristics of PLA/LPSQ-R depended on the type of R and LPSQ-R content. Dielectric relaxation spectroscopy (DRS) studies revealed one relaxation process present in PLA and related to the glass transition. However, for PLA/LPSQ-R blends two processes were identified: glass transition and normal–mode relaxation. The modification with fluorinated macromolecules increased hydrophobicity of amorphous PLA and improved its mechanical and gas barrier properties, which can be of importance for packaging applications.

【 授权许可】

Unknown