Polyurethanes with POSS pendent on flexible hard segments: Morphology and glass transition
Authors:
- Stefanos Koutsoumpis,
- Jan Ozimek,
- Konstantinos N. Raftopoulos,
- Edyta Hebda,
- Panagiotis Klonos,
- Christine M. Papadakis,
- Krzysztof Pielichowski,
- Polycarpos Pissisa
Abstract
Polyhedral Oligomeric Silsesquioxanne (POSS) moieties are tethered on a polyurethane chain, as side groups on the hard domains, which are based on the flexible hexamethylene diisocyanate (HDI). Their effect on morphology, and consequently on molecular dynamics, is studied in detail by microscopy, scattering, spectroscopic, thermal, and dielectric techniques. Albeit the PU micromorphology does not change radically, POSS-rich domains are formed. The segmental dynamics is severely slowed down in a continuous manner, i.e. without the emergence of a new, distinct relaxation, as was the case in a similar system based on the aromatic methylene diisocyanate (MDI). Strikingly, the slowed down components do not seem to have any calorimetric footprint, and hence the calorimetric Tg remains practically unaffected. The linear HDI systems have faster dynamics in the soft phase, as compared to the aromatic MDI ones, presumably owing to higher flexibility and better microphase separation.
- Record ID
- CUTb857c4bd7a384a90ae4967fb4cf69517
- Publication categories
- ;
- Author
- Journal series
- Polymer, ISSN 0032-3861, e-ISSN 1873-2291
- Issue year
- 2018
- Vol
- 147
- Pages
- 225-236
- Other elements of collation
- schem.; tab.; wykr.; Bibliografia (na s.) - 235-236; Bibliografia (liczba pozycji) - 60; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 147
- Keywords in English
- polyurethane, glass transition, POSS
- DOI
- DOI:10.1016/j.polymer.2018.06.012 Opening in a new tab
- URL
- https://www.sciencedirect.com/science/article/pii/S0032386118304981 Opening in a new tab
- Related project
- Zaawansowane organiczno-nieorganiczne materiały hybrydowe zawierające POSS: od nanorozmiarów do makroarchitektury. . Project leader at PK: , ,
Projects financed by NSC [Projekty finansowane przez NCN] - Language
- eng (en) English
- Score (nominal)
- 40
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTb857c4bd7a384a90ae4967fb4cf69517/
- URN
urn:pkr-prod:CUTb857c4bd7a384a90ae4967fb4cf69517
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.