scholarly journals Polyurethane cationomers containing fluorinated soft segments with hydrophobic properties

2021 ◽  
Author(s):  
Piotr Król ◽  
Kinga Pielichowska ◽  
Bożena Król ◽  
Katarzyna Nowicka ◽  
Małgorzata Walczak ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hard Segment ◽  
Molar Mass ◽  
Microphase Separation ◽  
Waterborne Polyurethane ◽  
Thermal And Mechanical Properties ◽  
Nmr Analysis ◽  
Hydrophobic Properties ◽  
Average Molar Mass ◽  
Soft Segments

AbstractThe synthesis of ecological waterborne polyurethane cationomers containing fluorinated polyol (0–20 wt.%) was successfully performed. FTIR and NMR analysis results confirmed the structure of the obtained polyurethane cationomers and incorporation of fluorinated component into the polyurethane chains. Average molar mass and phase structure of the obtained PU thin films were determined based on GPC, FTIR, WAXD and SEM-EDX results. The obtained cationomers have linear structures with clearly visible microphase separation of soft and hard segment domains; the presence of fluorinated polyol changes the strength of hydrogen bonds and in consequence degree of phase separation. The activation energy of glass transition was calculated based on multi-frequency DSC data. It has been shown that the presence of soft fluorinated segments in the cationomer structure strongly influences the hydrophobic, thermal and mechanical properties of the obtained films.

Waterborne polyurethane nanocomposite reinforced with amine intercalated α-zirconium phosphate - Study of thermal and mechanical properties

Polymer ◽  
2020 ◽  
Vol 186 ◽  
pp. 122008 ◽  
Author(s):  
Manoj B. Kale ◽  
Nidhin Divakaran ◽  
Suhail Mubarak ◽  
Duraisami Dhamodharan ◽  
T. Senthil ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Zirconium Phosphate ◽  
Waterborne Polyurethane ◽  
Thermal And Mechanical Properties

Study on the Influences of Domain Structure of Hydrophilic Polyurethane with Partially Crystalline on its Moisture Permeability

2011 ◽  
Vol 233-235 ◽  
pp. 281-287
Author(s):  
Heng Quan ◽  
Zhen Ya Gu
Keyword(s):  
Chemical Structure ◽  
Hard Segment ◽  
Microphase Separation ◽  
Soft Segment ◽  
Moisture Permeability ◽  
Soft Segments ◽  
Separation Degree ◽  
Polyethylene Glycol 1000 ◽  
Segmented Polyurethanes ◽  
Hydrophilic Polyurethane

Multiphase, segmented polyurethanes with mixed soft segment phase were prepared from 4,4’- diphenylmethane diisocyanate (Pure MDI), polybutylene adipate (glycol) 2000 (PBA2000) and polyethylene glycol 1000 (PEG1000) with 1,4-butanediol (BDO) as the chain extender. Further more, the relationships between domain separation structure, crystallizability of soft segment and moisture permeability, hydrophilic property, phase inversion temperature (PIT) of the polyurethanes were investigated. The studies show that the chemical structure, concentration of hydrophilic soft monomers and the microphase separation degree of the mixed soft segments from hard segment domain have remarkable effects on the application properties of polyurethane.

Poly(imide-siloxane)s based on hyperbranched polyimides

e-Polymers ◽  
2018 ◽  
Vol 18 (2) ◽  
pp. 105-110 ◽  
Author(s):  
Petr Sysel ◽  
Anna Patrova ◽  
Marek Lanc ◽  
Karel Friess
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Gas Separation ◽  
Molar Mass ◽  
Average Molar Mass ◽  
Hyperbranched Polyimides ◽  
Poly Imide ◽  
Oxydiphthalic Anhydride

AbstractPoly(imide-siloxane)s differing in their composition were prepared and characterized. The starting polymer (control) was the hyperbranched polyimide based on 4,4′-oxydiphthalic anhydride and 4,4′,4″-triaminotriphenylmethane. In the poly(imide-siloxane)s, 10 or 40–50 mol% of the 4,4′,4″-triaminotriphenylmethane was theoretically substituted for by amine-terminated siloxane dimer or oligomers. 1,3-Bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, bis(3-aminopropyl)-terminated poly(dimethylsiloxane) with a theoretical number-average molar mass of 1000 g·mol−1 and bis(3-aminopropyl)-terminated poly(dimethylsiloxane) with a theoretical number-average molar mass of 2500 g·mol−1 were used for this purpose. The thermo-mechanical properties and gas separation characteristics for hydrogen, carbon dioxide and methane of these polymeric products were shown to be dependent on their composition.

scholarly journals Thermal and mechanical properties of linear segmented polyurethanes with butadiene soft segments

1981 ◽  
Vol 21 (11) ◽  
pp. 668-674 ◽  
Author(s):  
C. M. Brunette ◽  
S. L. Hsu ◽  
M. Rossman ◽  
W. J. MacKnight ◽  
N. S. Schneider
Keyword(s):  
Mechanical Properties ◽  
Thermal And Mechanical Properties ◽  
Soft Segments ◽  
Segmented Polyurethanes

scholarly journals A systematic study of the effect of the hard end-group composition on the microphase separation, thermal and mechanical properties of supramolecular polyurethanes

Polymer ◽  
2016 ◽  
Vol 107 ◽  
pp. 368-378 ◽  
Author(s):  
Daniel Hermida Merino ◽  
Antonio Feula ◽  
Kelly Melia ◽  
Andrew T. Slark ◽  
Ioannis Giannakopoulos ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Systematic Study ◽  
Group Composition ◽  
Microphase Separation ◽  
Thermal And Mechanical Properties ◽  
End Group

Synthesis and thermal and mechanical properties of nonisocyanate poly(ether urethane) thermoplastic elastomers containing dibutylene terephthalate and poly(tetramethylene ether) segments

2020 ◽  
pp. 009524432092856
Author(s):  
Wang Guoliang ◽  
Wang Qian ◽  
Zhao Jingbo ◽  
Zhang Zhiyuan ◽  
Zhang Junying
Keyword(s):  
Mechanical Properties ◽  
Microphase Separation ◽  
Thermoplastic Polyurethane ◽  
Gel Permeation Chromatography ◽  
Thermal Characterization ◽  
Thermoplastic Elastomers ◽  
Thermal And Mechanical Properties ◽  
Reduced Pressure ◽  
Polyurethane Elastomers ◽  
Force Microscopy

Several novel semiaromatic poly(ether urethane) thermoplastic elastomers were synthesized through a nonisocyanate route. The nonisocyanate thermoplastic polyurethane elastomers (NI-TPUEs) were prepared via a transurethane polycondensation of bis(hydroxyethyl) hexanediurethane with bis(4-hydroxybutyl) terephthalate and poly(tetramethylene glycol)s under a reduced pressure of 3 mmHg at 170°C. The NI-TPUEs were fully characterized. The influence of hard segment (HS) contents on thermal and mechanical properties was studied. Gel permeation chromatography characterization demonstrated that high molecular weight of NI-TPUEs was obtained. Wide-angle X-ray scattering and thermal characterization verified that NI-TPUEs were crystallizable and had a relatively high melting point. Atomic force microscopy exhibited microphase separation between the crystallized HSs and amorphous phases. High content of HSs and flexible poly(tetramethylene ether) soft segments leads to good crystallization, excellent mechanical property, and good resilience of NI-TPUEs.

scholarly journals Uncatalyzed synthesis, thermal and mechanical properties of polyurethanes based on poly(ε-caprolactone) and 1,4-butane diisocyanate with uniform hard segment

Biomaterials ◽  
2005 ◽  
Vol 26 (20) ◽  
pp. 4219-4228 ◽  
Author(s):  
Ralf G.J.C. Heijkants ◽  
Ralph V. van Calck ◽  
Tony G. van Tienen ◽  
Jacqueline H. de Groot ◽  
Pieter Buma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hard Segment ◽  
Thermal And Mechanical Properties

Study on the Synthesis and Properties of Biodegradable Waterborne Polyurethane

2012 ◽  
Vol 554-556 ◽  
pp. 130-135 ◽  
Author(s):  
Fei Liang ◽  
Bei Qin ◽  
Ying Yang ◽  
Min Jia
Keyword(s):  
Mechanical Properties ◽  
Hydrolytic Degradation ◽  
Waterborne Polyurethane ◽  
Molar Ratio ◽  
Waterborne Polyurethanes ◽  
Soft Segments ◽  
Hard Segments ◽  
R Value ◽  
Medical Material ◽  
Step Polymerization

Taking L-Lysine Diisocyanate (LDI) as hard segments, poly-ε-caprolactone diol (PCL) as soft segments, a kind of nontoxic and biodegradable waterborne polyurethanes were synthesized using two-step polymerization. And then the effects of isocyanate/macroglycol molar ratio(NCO/OH, R value), the 1,4-butylene glycol (BDO) content and prepolymerization temperature on the properties of waterborne polyurethanes were investigated. The experimental results showed that when R value is 1.5, the BDO content used is 4% and the reaction temperature is 80°C, the products prepared were best in application. The mechanical property tests showed that it has good mechanical properties, tensile strength is up to 46.5MPa and the loss amounts of the hydrolytic degradation after 80 days is 42%. The waterborne polyurethanes prepared have excellent biodegradability, which can be widely used as a biological medical material.

Recent developments in waterborne polyurethane dispersions (WPUDs): a mini-review on thermal and mechanical properties improvement

2021 ◽  
Author(s):  
Swapnil M. Vaidya ◽  
Simran M. Jadhav ◽  
Mitesh J. Patil ◽  
Siddhesh U. Mestry ◽  
Umesh R. Mahajan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Waterborne Polyurethane ◽  
Thermal And Mechanical Properties ◽  
Recent Developments ◽  
Polyurethane Dispersions
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