Effect of pyridazine content and crosslinker structure on the properties of polyurethane elastomers

Oprea, Stefan

doi:10.1002/app.38640

Cited by 9 publications

(11 citation statements)

References 30 publications

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“…This can be explained by the fact that the increase in DAP content decreases the number of urethane NH‐hydrogen bonds and increases the hydrogen bonding of the urea and heteroatom of the purine ring. This behavior is similar to that of other heterocyclic polyurethanes …”

Section: Resultsmentioning

confidence: 99%

“…This shows better thermal stability than conventional polyurethanes chain‐extended with 1,4‐butanediol (Fig. a), but weaker than that generated by using other heterocyclic chain extender (pyridazine) . The main weight loss (10‐85%) started at about 340 °C and was complete around 570 °C.…”

Section: Resultsmentioning

confidence: 99%

“…The morphology and properties of such polyurethanes is given by the chemical nature and composition of the hard and soft segments. The inclusion of new chemical structures in the hard domain of the backbone chains can improve intermolecular association, through strong physical or chemical cross‐links, thus increasing the range of possible practical applications for these polymers …”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Thermo‐Mechanical Properties of Poly(urethaneurea) Elastomers Based on Heterocyclic Cross‐linkers and Purine Diamine as a Chain Extender

Oprea¹,

Potolinca²

2015

Adv Polym Technol

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This paper presents the synthesis and studies the properties of two series of linear and cross-linked poly(urethaneurea) elastomers, which contain purine derivatives in their backbone chains. The samples in the linear series are chain-extended with 2,6-diaminopurine in various ratios, whereas in the second series mixtures of 2,6-diaminopurine and various cross-linkers were used. The presence of purine rings within these polyurethanes increases structural stiffness due to the rigidity of the purine unit and also because of the intermolecular hydrogen bonds in the urea groups regions. The characterization of the molecular structure of these poly(urethaneurea)s was achieved by FTIR, whereas thermal behavior was observed through thermogravimetric analysis and dynamic mechanical analysis. Mechanical measurements showed greater elongation and tensile strength for poly(urethaneurea)s with a lower content of purine moieties in the hard segment. The strain at break value is lower in the case of cross-linked samples compared to that of the linear purine poly(urethaneurea) series. C 2015 Wiley Periodicals, Inc. Adv Polym Technol 2016, 35, 21532; View this article online at wileyonlinelibrary.com.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and Thermo‐Mechanical Properties of Poly(urethaneurea) Elastomers Based on Heterocyclic Cross‐linkers and Purine Diamine as a Chain Extender

Oprea¹,

Potolinca²

2015

Adv Polym Technol

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“…Polyurethanes with heterocyclic structures exhibit improved both thermal and mechanical properties that are useful in many practical applications. The following heterocyclic derivatives have been used in the synthesis of polyurethanes: sulfadiazine [27], pyridine [28][29][30], triazine [31,32], quinoline [33], pyrol [34], pyridazine [35], isosorbide [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Linear polyurethanes with imidazoquinazoline rings: preparation and properties evaluation

et al. 2019

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In this work, research concerning the synthesis and properties of linear polyurethanes (PUs) with the imidazoquinazoline rings was represented. Reaction conditions of 2,6-bis(2-hydroxyethyl)-1-phenylimida-zo[1,5-c]quinazoline-3,5-dione (BHPIQ) with 1,6-hexamethylene diisocyanate were determined and optimized. These conditions are adapted to reaction of BHPIQ with 4,4′-diphenylmethane diisocyanate and 2,4-toluene diisocyanate. New PUs with imidazoquinazoline rings were characterized by spectral methods (1 H-NMR and IR spectroscopies), which confirm their structures. Their molar masses and dispersity index were measured by size exclusion chromatography method. The wide-angle X-ray scattering and differential scanning calorimetry (DSC) studies have shown that all PUs based on BHPIQ are amorphous. Moreover, thermal properties of PUs were investigated by thermogravimetry analysis, standard DSC, and temperature-modulated DSC methods. During thermogravimetric measurements, the exhaust gases were analyzed by FTIR method. Incorporation of imidazoquinazoline ring into the PU chains escalates their glass transition temperature; thus, their heat resistance was enhanced. Furthermore, their degradation rate and the amount of released degradation products were

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“…Polyurethanes with heterocyclic structures exhibit improved thermal and mechanical properties that are useful in many practical applications. A lot of different heterocyclic derivatives have been used in the synthesis of polyurethanes, such as: sulfadiazine, pyridine, triazine, quinoline, pyrol, pyridazine, isosorbide …”

Section: Introductionmentioning

confidence: 99%

Biodegradation of pyridine‐based polyether polyurethanes by the Alternaria tenuissima fungus

Oprea¹,

Potolinca²,

Gradinariu

et al. 2017

J of Applied Polymer Sci

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The scope of the present work is to study the biodegradability behavior of several novel heterocyclic poly(ether urethanes) when their hard segments are subjected to exposure to the Alternaria tenuissima fungus. The heterocyclic poly(ether urethanes) were chain-extended with various pyridine derivatives that had different functional groups placed in different positions on the pyridine rings. Different ratios of the reactive components were also used. The measurements obtained by the use of the attenuated total reflectance-Fourier transform infrared spectroscopy revealed the different structural changes that occurred after exposure to fungi. The degradation process was analyzed through measurement of the mechanical properties and surface morphology evolution by scanning electron microscopy. The obtained results show that the nature and design of the functional groups on the pyridine ring determine the strength of the cohesion linkages that in turn influence different degradation behaviors under exposure to fungi. V C 2017Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46096.

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Effect of pyridazine content and crosslinker structure on the properties of polyurethane elastomers

Cited by 9 publications

References 30 publications

Synthesis and Thermo‐Mechanical Properties of Poly(urethaneurea) Elastomers Based on Heterocyclic Cross‐linkers and Purine Diamine as a Chain Extender

Synthesis and Thermo‐Mechanical Properties of Poly(urethaneurea) Elastomers Based on Heterocyclic Cross‐linkers and Purine Diamine as a Chain Extender

Linear polyurethanes with imidazoquinazoline rings: preparation and properties evaluation

Biodegradation of pyridine‐based polyether polyurethanes by the Alternaria tenuissima fungus

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