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

Assoc Chemical Engineers Serbia, Belgrade 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, H-1- and 2D-NMR spectroscopy, and 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.

segmented polyurethanes; poly(dimethylsiloxane); 2D-NMR spectroscopy; surface free energy; morphology; article

Open access content. Open access content
https://creativecommons.org/licenses/by-nc-nd/4.0
BY-NC-ND
openAccess

Hemijska industrija

RSPST oai:cer.ihtm.bg.ac.rs:123456789/1989
0367-598X
https://cer.ihtm.bg.ac.rs/handle/123456789/1989
10.2298/HEMIND151127009S
Conv_3318
https://cer.ihtm.bg.ac.rs//bitstream/id/8417/1987.pdf
2-s2.0-85011867229
000392310700012
1085059146

UIVERSITY OF BELGRADE
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