Synthesis and characterization of poly(urethane‐ether)s from calcium salt of <i>p</i>‐hydroxybenzoic acid

Nair, Priya A.; Ramesh, P.

doi:10.1002/app.33906

Cited by 6 publications

(7 citation statements)

References 30 publications

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“…The research of Ramesh and Nair broadens the field of ion‐containing polyurethanes to include the divalent calcium cation . Utilizing commercially available calcium L‐lactate hydrate (compound B in Figure ), PTMO, and hexamethylene diisocyanate (HDI) in the one‐shot polymerization process, segmented calcium‐containing polyurethanes were achieved .…”

Section: Effect Of Ion‐incorporation On Segmented Polyurethane Propermentioning

confidence: 99%

“…The ion‐containing polyurethane outperformed the control in all areas of tensile testing (tensile strength, modulus, toughness, and elongation at break) and blood compatibility experiments with the calcium‐containing segmented polyurethanes displayed encouraging results. In a similar study that substituted the calcium salt of p ‐hydroxybenzoic acid as the ion‐containing chain extender, the amount of ionic content was varied and the resulting effect on the thermal, thermomechanical, and tensile properties of the ion‐containing polyurethanes was discussed …”

Section: Effect Of Ion‐incorporation On Segmented Polyurethane Propermentioning

confidence: 99%

“…The research of Ramesh and Nair broadens the fi eld of ion-containing polyurethanes to include the divalent calcium cation. [ 34,37,85 ] Utilizing commercially available calcium L-lactate hydrate (compound B in Figure 3 ), PTMO, and hexamethylene diisocyanate (HDI) in the one-shot polymerization process, segmented calciumcontaining polyurethanes were achieved. [ 34 ] Compared with a neutral control, dynamic mechanical analysis (DMA) displayed a higher storage modulus and T g for the calcium-containing polyurethane.…”

Section: Effect Of Ion-incorporation On Segmented Polyurethane Propermentioning

confidence: 99%

“…In a similar study that substituted the calcium salt of p -hydroxybenzoic acid as the ion-containing chain extender, the amount of ionic content was varied and the resulting effect on the thermal, thermomechanical, and tensile properties of the ion-containing polyurethanes was discussed. [ 85 ]…”

Section: Location Of Ionic Groupsmentioning

confidence: 99%

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Synthesis, Properties, and Applications of Ion‐Containing Polyurethane Segmented Copolymers

Nelson

Long

2014

Macro Chemistry & Physics

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Despite the well-established foundation of polyurethane chemistry in both industry and academia, research continues at a vigorous pace to refi ne synthetic processes and discover new functional materials. Incorporating ionic groups into polymers is a synthetic parameter capable of tailoring polymer properties and enabling emerging technologies. This review focuses on recent effort in the fi eld of ion-containing segmented polyurethane copolymers. Multiple synthetic strategies to incorporate both cationic and anionic sites, including a particular focus on waterborne polyurethane dispersions and green synthetic methods, are examined. Fundamental structure-property relationships based on ionic structure, content, and placement are explored and many applications, including biomedical products and polymer electrolytes for energy devices are discussed.(PEG) or poly(tetramethylene oxide) (PTMO), to the polyurethane reaction. The hydrogen bonding, depicted in Figure 1 , between the urethane carbonyl oxygen and urethane hydrogen, coupled with crystallization, constructs the hard segment (HS) domains, while the functionalized fl exible spacers comprise the soft segments (SSs) in an alternating fashion. The microphase-separated morphology of segmented polyurethanes is the foundation for their versatility, with the ability to further tune materials for a specifi c application with other synthetic parameters such as chemical composition and molecular weight. Yilgör and co-workers, [ 5 ] Yurtsever and co-workers, [ 6 ] and Wilkes and co-workers [ 7 ] extensively studied various model segmented polyurethane systems to further understand the morphology and factors infl uencing morphology on a fundamental structure-property level.Many comprehensive reviews and peer-reviewed journal articles focus on fundamental structure-property relationships of segmented polyurethanes.

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Section: Effect Of Ion‐incorporation On Segmented Polyurethane Propermentioning

confidence: 99%

Section: Effect Of Ion‐incorporation On Segmented Polyurethane Propermentioning

confidence: 99%

Section: Effect Of Ion-incorporation On Segmented Polyurethane Propermentioning

confidence: 99%

Section: Location Of Ionic Groupsmentioning

confidence: 99%

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Synthesis, Properties, and Applications of Ion‐Containing Polyurethane Segmented Copolymers

Nelson

Long

2014

Macro Chemistry & Physics

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“…Aliphatic diisocyanate in addition to producing relatively less toxic diamine also exhibits good light stability, and it is also resistant to hydrolysis compared to aromatic diisocyanate . Recently, Nair and Ramesh have used aliphatic diisocyanate for the preparation of polyurethanes for the use in biomedical applications along with calcium salt of p ‐hydroxybenzoic acid and calcium lactate . Herein we attempted to synthesize ionic metal‐containing polyurethane urea using the aliphatic diisocyanate 4,4′‐methylene bis(cyclohexyl isocyanate) along with calcium salt of p ‐aminobenzoic acid, which acts as the chain extender.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Electrospinning of Calcium-Containing Polyurethane Urea

Nair

Ramesh

2015

Adv. Polym. Technol.

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Calcium‐containing segmented polyurethane urea was synthesized using a calcium salt of p‐aminobenzoic acid, polytetramethylene glycol, and 4,4′‐methylene bis(cyclohexyl isocyanate) and thereafter fabricated into three‐dimensional scaffolds for the use in biomedical applications. Biocompatibility evaluation of the polymer showed that this newly developed metal‐containing polyurethane urea demonstrated good cytocompatibility and hemocompatibility. The fabricating ability of the metal‐containing polymer was studied by the electrospinning process. The effect of various parameters such as polymer concentration, applied voltage, and flow rate on the electrospinning process, morphology, and diameter of the resultant fibers was investigated. The findings indicate that increasing the concentration and flow rate of the solution increases the fiber diameter. It was also demonstrated that increasing the applied voltage decreases the fiber diameter. Mechanical property evaluation of the scaffolds showed that the strength of the scaffold depends on both the diameter and morphology of the fibers. As the fiber diameter increases from 1.6 to 3.02 μm, the tensile strength enhanced from 3 to 7 MPa.

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Validated HPTLC method for the simultaneous quantification of diterpenoids in Vitex trifolia L.

2013

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Vitex trifolia L. is an important Indian medicinal plant with diverse pharmacological properties. In a recent study, we reported the isolation and antitubercular activity evaluation of three new diterpenoids from its leaves; here we have developed a validated rapid, simple, precise, and accurate high-performance TLC method for the simultaneous quantification of isolated diterpenoids in V. trifolia. Diterpenoids, 6α,7α-diacetoxy-13-hydroxy-8(9),14-labdadien (A), 13-hydroxy-5(10),14-halimadien-6-one (B), and 9-hydroxy-13(14)-labden-16,15-olide (C) were separated on silica gel 60F254 high-performance TLC plates using chloroform/acetone (98:2, v/v) as mobile phase. The quantitation of diterpenoids was carried out using densitometric reflection/absorption mode at 610 nm after postchromatographic derivatization using a vanillin/sulfuric acid reagent. A precise and accurate quantification can be performed for compounds A and B in the linear working concentration range of 333-1000 ng/band and for C in the range of 670-2000 ng/band with good correlations (r = 0.9984, 0.9991, and 0.9994, respectively). The method was validated for peak purity, precision, accuracy, robustness, LOD, and LOQ, as per the ICH guidelines. The method reported here is simple, reproducible and may be applied for the quantitative analysis of the above diterpenoids in the leaves of V. trifolia.

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Synthesis and characterization of poly(urethane‐ether)s from calcium salt of p‐hydroxybenzoic acid

Cited by 6 publications

References 30 publications

Synthesis, Properties, and Applications of Ion‐Containing Polyurethane Segmented Copolymers

Synthesis, Properties, and Applications of Ion‐Containing Polyurethane Segmented Copolymers

Synthesis, Characterization, and Electrospinning of Calcium-Containing Polyurethane Urea

Validated HPTLC method for the simultaneous quantification of diterpenoids in Vitex trifolia L.

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