Hydration and glass transition of hybrid non-isocyanate polyurethanes with POSS inclusions

Raftopoulos, Konstantinos N.; Łukaszewska, Izabela; Calduch, Carlos Bujalance; Stachak, Piotr; Lalik, Sebastian; Hebda, Edyta; Marzec, M.; Pielichowski, Krzysztof

doi:10.1016/j.polymer.2022.125010

Cited by 15 publications

(12 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The loss of mechanical performance of our NIPUs in the hydrated state may be related to moisture-induced plasticization primarily caused by the presence of those –OH groups, as described for NIPU-based materials. 44–46 A drop in Young's modulus is usually accompanied by a decrease in σ r , which was observed in our NIPU samples. However, in contrast to Pronoitis et al , 45 an increase in ε r was not observed neither for PPG-NIPU nor for PTHF-NIPU.…”

Section: Discussionsupporting

confidence: 75%

Design, manufacturing and testing of a green non-isocyanate polyurethane prosthetic heart valve

Melo,

Nondonfaz,

Aqil

et al. 2024

Biomater. Sci.

View full text Add to dashboard Cite

show abstract

Section: Discussionsupporting

confidence: 75%

Design, manufacturing and testing of a green non-isocyanate polyurethane prosthetic heart valve

Melo,

Nondonfaz,

Aqil

et al. 2024

Biomater. Sci.

View full text Add to dashboard Cite

show abstract

“…The resulting values for

and

were 0.63 ± 0.071 and 0.918 ± 0.004, respectively. The

parameter exhibits a rather low value compared to the values reported in the literature for similar systems [ 67 , 68 ]; however, it remains in the range characteristic for Brunauer type III isotherms [ 70 ]. The

parameter is close to 1.0 and of the value is usually reported for the materials exhibiting Brunauer type III behavior [ 67 , 68 ].…”

Section: Resultsmentioning

confidence: 82%

“…The

parameter is close to 1.0 and of the value is usually reported for the materials exhibiting Brunauer type III behavior [ 67 , 68 ]. The closer the

parameter is to unity, the more similar the behavior of the formed multilayers is to the behavior of liquid water [ 71 ].…”

Section: Resultsmentioning

confidence: 82%

“…Equilibrium sorption isotherms (ESI) ( Figure 5 a) show a Brunauer type III form [ 62 ], which is observed mainly for systems such as biopolymers, microporous polymeric adsorbents, and water-soluble solids [ 63 , 64 , 65 ], and suggests sorption through the capillary condensation mechanism [ 66 ]. Interestingly, ESI of type III is often observed for conventional and non-isocyanate polyurethanes [ 5 , 67 , 68 ]. Slight differences in water uptake ( Figure 5 a) vanish when water absorption is normalized to the polymer mass ( Figure 5 b), which supports the previous statement regarding the lack of POSS influence on the water absorption, despite the fact that silica fillers could decrease water absorption (g water/g polymer) in composite materials [ 69 ].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Examining the Water–Polymer Interactions in Non-Isocyanate Polyurethane/Polyhedral Oligomeric Silsesquioxane Hybrid Hydrogels

Łukaszewska,

Bukowczan,

Raftopoulos

et al. 2023

Polymers

Self Cite

View full text Add to dashboard Cite

Non-isocyanate polyurethane (NIPU) networks physically modified with octa(3-hydroxy-3-methylbutyldimethylsiloxy)POSS (8OHPOSS, 0–10 wt%) were conditioned in environments of different relative humidities (up to 97%) to study water–polymer interactions. The equilibrium sorption isotherms are of Brunauer type III in a water activity range of 0–0.97 and are discussed in terms of the Guggenheim (GAB) sorption model. The study shows that the introduction of 8OHPOSS, even in a large amount (10 wt%), does not hinder the water affinity of the NIPU network despite the hydrophobic nature of POSS; this is attributable to the homogenous dispersion of POSS in the polymer matrix. The shift in the urethane-derived carbonyl bands toward lower wavenumbers with a simultaneous shift in the urethane N-H bending bands toward higher wavenumbers exposes the breakage of polymer–polymer hydrogen bonds upon water uptake due to the formation of stronger water–polymer hydrogen bonds. Upon water absorption, a notable decrease in the glass transition temperature (Tg) is observed for all studied materials. The progressive reduction in Tg with water uptake is driven by plasticization and slaving mechanisms. POSS moieties are thought to impact slaving indirectly by slightly affecting water uptake at very high hydration levels.

show abstract

“…[55,71,72,[93][94][95] Thus, syntheses of thermosetting PHUs are generally carried out at high temperatures, that is, T ≥ 70 °C, in order to promote the homogenization of the monomers and the carbonate-amine reaction. [9][10][11][12][13][14][15][16][17]20,23,[25][26][27][28][29]31,32,36,38,39,45,68,[96][97][98][99][100][101][102][103] However, the following part of this literature review shows that an increasing number of references are reporting the synthesis of PHU networks at low temperatures, using several of the levers previously mentioned. Arbitrarily, the limit to discriminate the high-from the low-temperature curable systems was set at 70 °C.…”

Section: Preamblementioning

confidence: 99%

Design of Plurifunctional Cyclocarbonates and their Use as Precursors of Poly(hydroxyurethane) Thermosets: A Review

Helbling,

Hermant,

Petit

et al. 2023

Macro Chemistry & Physics

View full text Add to dashboard Cite

Polyhydroxyurethanes (PHUs) are promising polymers to replace polyurethanes (PUs), classically obtained by the isocyanate‐alcohol route. Various application fields of PUs, e.g. foams or coatings, require the use of thermosetting polymers. Hence, a great deal of effort has been devoted to the development of PHU thermosets in the recent literature. This review highlights the different strategies developed through the years to synthesize plurifunctional cyclic carbonates, also called poly(cyclic carbonate)s, and whose functionality ≥ 3 is a prerequisite for the synthesis of thermosetting PHUs. A special emphasize is accorded to the safe and eco‐friendly synthetic approaches (e.g., phosgene‐free, use of renewable reactants). In addition, the curing strategies implemented to overcome the low reactivity of the monomers and the limitations related to the transitions of the growing networks (i.e., viscosification, gelation, vitrification) are described. In the end, the curing of PHUs under mild thermal conditions, down to room temperature, is described. Such curing conditions are uncommon for PHU thermosets and are paving the way to much anticipated applications such as coatings, adhesives or 3D‐printing.This article is protected by copyright. All rights reserved

show abstract

Hydration and glass transition of hybrid non-isocyanate polyurethanes with POSS inclusions

Cited by 15 publications

References 79 publications

Design, manufacturing and testing of a green non-isocyanate polyurethane prosthetic heart valve

Design, manufacturing and testing of a green non-isocyanate polyurethane prosthetic heart valve

Examining the Water–Polymer Interactions in Non-Isocyanate Polyurethane/Polyhedral Oligomeric Silsesquioxane Hybrid Hydrogels

Design of Plurifunctional Cyclocarbonates and their Use as Precursors of Poly(hydroxyurethane) Thermosets: A Review

Contact Info

Product

Resources

About