Impact of the poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly(propylene oxide) macrodiols on the surface-related properties of polyurethane copolymers

0468443 - ÚMCH 2017 RIV RS eng J - Journal Article
Stefanović, I. S. - Godevac, D. - Špírková, Milena - Jovančić, P. - Tešević, V. - Milačić, V. - Pergal, M. V.
Impact of the poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly(propylene oxide) macrodiols on the surface-related properties of polyurethane copolymers.
Hemijska industrija. Roč. 70, č. 6 (2016), s. 725-738. ISSN 0367-598X. E-ISSN 2217-7426
R&D Projects: GA ČR(CZ) GA13-06700S
Institutional support: RVO:61389013
Keywords : segmented polyurethanes * poly(dimethylsiloxane) * 2D NMR spectroscopy
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 0.459, year: 2016

Segmented thermoplastic polyurethane copolymers (PURs) were synthesized using 4,4'-methylenediphenyl diisocyanate and 1,4-butanediol as the hard segment and alpha,omega-dihydroxy-poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly(propylene oxide) (PPO-PDMS) as the soft segment. The content of incorporated soft segments in PURs varied in the range from 40 to 90 wt.%. The structure, molecular weights and crystallinity of obtained copolymers were monitored by FTIR, 1H, 2D NMR spectroscopy, GPC and DSC analysis, respectively. Surface free energy analysis indicates the presence of hydrophobic (siloxane) groups on the surface, giving highly hydrophobic nature to the obtained PURs films. Water absorption measurements showed that the increase of the hydrophobic PPO-PDMS segment content, led to the decrease of percentage of absorbed water in copolymers. SEM and AFM analysis revealed that copolymers with lower content of PPO-PDMS segments have higher microphase separation between segments. The results obtained in this work indicate that synthesized PURs based on PPO-PDMS, demonstrated proper surface and morphological properties with a great potential for variety of applications such as hydrophobic coatings in biomedicine.
Permanent Link: http://hdl.handle.net/11104/0269257