Polyureas: Synthesis, Characterization and Dyeing Application in Nylon and Polyester

Joshi, Medha; Jauhari, Smita

doi:10.1080/03602559.2010.543242

Cited by 6 publications

(8 citation statements)

References 10 publications

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“…Accordingly, they are used for castings. On the other hand, PURs containing aromatic structures melt near their decomposition temperatures [19].…”

Section: Polyureasmentioning

confidence: 99%

“…The colloidal suspension which formed immediately was then stirred at room temperature for an hour". The resultant mixture was refluxed for 2 h, and then filtered off and dried (95% yields) (Figure 6) [19]. The topic of stained PURs has received very little academic attention.…”

Section: Synthesis Of Polyureasmentioning

confidence: 99%

“…Due to the urea groups, they can be compatible with thermoplastics and can easily form colored articles, even when processed at high temperatures. [35] All the polyureas based on azo disperse dyes of the type AAB were prepared as follows, from reference [19]: "To an ice cooled solution of azo disperse dye sample (0.01 moles) in dry tetrahydrofuran (50 mL) a solution of hexamethylene diisocyanate (0.01 mole) in 50 mL dry tetrahydrofuran was added gradually with constant stirring. The colloidal suspension which formed immediately was then stirred at room temperature for an hour".…”

Section: Synthesis Of Polyureasmentioning

confidence: 99%

“…The colloidal suspension which formed immediately was then stirred at room temperature for an hour". The resultant mixture was refluxed for 2 h, and then filtered off and dried (95% yields) (Figure 6) [19]. Synthetic or natural polymers that contain labile groups or bonds (hydrolysis or enzyme digestion) are called biodegradable polymers.…”

Section: Synthesis Of Polyureasmentioning

confidence: 99%

“…As a polymerization technique, the polyaddition procedure was performed. As polyaddition catalysts, various Lewis bases (tertiary amines, i.e., 1,4-diazabicyclo-[2.2.0]octane or triethylamine) as well as Lewis acids (especially tin organic compounds) have been used [17][18][19]. The mechanism of the catalysis is not completely understood, which means that for every polyaddition, the best suitable catalyst and solvent system has to be screened.…”

Section: Synthesis Of Polymersmentioning

confidence: 99%

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Polyureas Versatile Polymers for New Academic and Technological Applications

et al. 2021

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Polyureas (PURs) are a competitive polymer to their analogs, polyurethanes (PUs). Whereas PUs’ main functional group is carbamate (urethane), PURs contain urea. In this revision, a comprehensive overview of PUR properties, from synthesis to technical applications, is displayed. Preparative routes that can be used to obtain PURs using diisocianates or harmless reagents such as CO2 and NH3 are explained, and aterials, urea monomers and PURs are discussed; PUR copolymers are included in this discussion as well. Bulk to soft components of PUR, as well as porous materials and meso, micro or nanomaterials are evaluated. Topics of this paper include the general properties of aliphatic and aromatic PUR, followed by practical synthetic pathways, catalyst uses, aggregation, sol–gel formation and mechanical aspects.

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“…Accordingly, they are used for castings. On the other hand, PURs containing aromatic structures melt near their decomposition temperatures [19].…”

Section: Polyureasmentioning

confidence: 99%

Section: Synthesis Of Polyureasmentioning

confidence: 99%

Section: Synthesis Of Polyureasmentioning

confidence: 99%

“…The colloidal suspension which formed immediately was then stirred at room temperature for an hour". The resultant mixture was refluxed for 2 h, and then filtered off and dried (95% yields) (Figure 6) [19]. Synthetic or natural polymers that contain labile groups or bonds (hydrolysis or enzyme digestion) are called biodegradable polymers.…”

Section: Synthesis Of Polyureasmentioning

confidence: 99%

Section: Synthesis Of Polymersmentioning

confidence: 99%

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Polyureas Versatile Polymers for New Academic and Technological Applications

et al. 2021

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Synthesis and Characterization of New Polyureas with Improved Thermal Stability from a Novel Ether Keto Diamine

et al. 2015

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A novel diamine monomer was prepared in three steps: first, a nucleophilic substitution reaction between hydroquinone and 1‐flouro‐4‐nitrobenzene afforded a nitro compound. Second, the nitro group of this compound was converted to an amino group via reduction in the presence of hydrazine hydrate. In the last step, the reaction of this compound with 4,4'‐diflouro benzophenone led to the synthesis of a novel ether keto diamine. Characterization of all materials was carried out by conventional spectroscopic methods and elemental analysis. A series of new polyureas was prepared via the polymerization reaction of the synthesized diamine with three commercially available diisocyanates including 4,4'‐diphenylmethan diisocyanate, toluene‐2,4‐diisocyanate, and isophoronediisocyanate in N‐methyl‐2‐pyrrolidone. The resulted polyureas were characterized by infrared spectroscopy and elemental analysis. The inherent viscosities of these polyureas ranged from 0.59 to 0.62 dL/g measured at a concentration of 0.5 g/dL. The resulting polyureas were soluble in dipolar aprotic solvents. The thermal properties of the polymers were investigated by differential scanning calorimetry and thermogravimetric analysis. The results indicated that their glass transition temperature values were between 171 and 198°C and at the 10% weight loss of polymers, glass transition temperature was about 325–368°C showing improved thermal stability in comparison with common polyureas. Thermal stability features of the polyurea were also confirmed by means of the pyrolysis‐gas chromatography/mass spectrometry method.

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