Synthesis and characterization of calcium-containing polyurethane using calcium lactate as a chain extender

Nair, Priya A.; Ramesh, P.

doi:10.1038/pj.2012.51

Cited by 11 publications

(20 citation statements)

References 27 publications

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“…Commercially available oligomeric polyols are often used in the synthesis of segmented polyurethanes as an easily accessible starting material with known

{\overline{M}}_{n}

and confirmed difunctionality, which eliminate the needs for (multistep) reactions and arduous purification . Common oligomers include PEG, PTMO, poly(propylene glycol) (PPG), and poly(caprolactone) (PCL) .…”

Section: Synthesis Of Ion‐containing Segmented Polyurethanesmentioning

confidence: 99%

“…Commercially available oligomeric polyols are often used in the synthesis of segmented polyurethanes as an easily accessible starting material with known

{\overline{M}}_{n}

{\overline{M}}_{n}

values, which is convenient for probing the effect of SS

{\overline{M}}_{n}

on polymer properties; however, most commercially available oligomers are neutral and lack necessary functionality for incorporating charged species.…”

Section: Synthesis Of Ion‐containing Segmented Polyurethanesmentioning

confidence: 99%

“…Figure 3 depicts a selection of monomers employed in the synthesis of ion-containing segmented polyurethanes, where the charge solely resides in the HS. [26][27][28]33,34 ] Details pertaining to the resultant polyurethanes are discussed in subsequent sections; however, this group of monomers emphasizes the chemical and structural diversity of ion-containing polyurethanes. This diversity facilitates the complex design of polyurethanes for targeted applications.…”

Section: Synthesis Of Ion-containing Segmented Polyurethanesmentioning

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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“…Commercially available oligomeric polyols are often used in the synthesis of segmented polyurethanes as an easily accessible starting material with known

{\overline{M}}_{n}

Section: Synthesis Of Ion‐containing Segmented Polyurethanesmentioning

confidence: 99%

“…Commercially available oligomeric polyols are often used in the synthesis of segmented polyurethanes as an easily accessible starting material with known

{\overline{M}}_{n}

{\overline{M}}_{n}

values, which is convenient for probing the effect of SS

{\overline{M}}_{n}

on polymer properties; however, most commercially available oligomers are neutral and lack necessary functionality for incorporating charged species.…”

Section: Synthesis Of Ion‐containing Segmented Polyurethanesmentioning

confidence: 99%

Section: Synthesis Of Ion-containing Segmented Polyurethanesmentioning

confidence: 99%

See 1 more Smart Citation

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

Nelson

Long

2014

Macro Chemistry & Physics

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“…1 H‐NMR spectrum was recorded using 300‐MHz Brucker NMR spectrometer in dimethyl sulfoxide containing small amount of TMS as the internal standard. The elemental composition of the polymer and the degradation medium was determined by optical emission spectroscopy with inductively coupled plasma (Perkin Elmer OES‐ICP, 5300DV) by a previously described method 16. Viscosity of the polymer was determined using Ubbelohde viscometer at 30°C.…”

Section: Methodsmentioning

confidence: 99%

“…The elemental composition of the polymer and the degradation medium was determined by optical emission spectroscopy with inductively coupled plasma (Perkin Elmer OES-ICP, 5300DV) by a previously described method. 16 Viscosity of the polymer was determined using Ubbelohde viscometer at 30 C. The thermal behavior of the scaffold was analyzed by thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). TGA analysis was carried out using a TA Thermal Analyzer (TA Instruments Inc., USA, Model SDT-2960) under nitrogen atmosphere at a heating rate of 10 C/min.…”

Section: Methodsmentioning

confidence: 99%

Electrospun biodegradable calcium containing poly(ester‐urethane)urea: Synthesis, fabrication, in vitro degradation, and biocompatibility evaluation

Nair

Ramesh

2012

J Biomedical Materials Res

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In this work an in vitro degradable poly(ester-urethane)urea (PEUU) was synthesized using polycaprolactone diol, hexamethylene diisocyanate, and calcium salt of p-aminobenzoic acid. The synthesized polymer was characterized by (1) H-NMR and FTIR spectroscopy and viscosity studies. Scaffolds having random micro fibrous structures were fabricated from PEUU by electrospinning process. The thermal properties of the scaffold were evaluated by thermogravimetric analysis and dynamic mechanical analysis. The mechanical property evaluation showed that the scaffold possess sufficiently high tensile strength of 16 MPa. The in vitro degradation studies of the electrospun scaffold were carried out in phosphate buffer saline for 6 months. The average mass loss of the scaffold after 6 months of hydrolytic degradation was 25%. FTIR spectroscopy study confirmed the degradation of the PEUU from decrease in intensity of 1400 cm(-1) peak corresponding to ionic carboxylate group. Presence of amine group and calcium ions in the degradation medium further confirmed the degradation of the hard segment in the hydrolytic medium. The mechanical property evaluation of the scaffold indicated a gradual decrease in tensile strength and modulus whereas percentage elongation of the scaffold increases with time of in vitro degradation. The morphological evaluation of the scaffold after degradation by SEM shows evidence of broken fibers and pores in the scaffold. Preliminary in vitro cytotoxicity test demonstrated that both the material and the degradation products were noncytotoxic in nature and the material showed good proliferation to L-929 cells.

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Harnessing Protein Waste into Reduced Graphitic Carbon Oxide‐Copper‐Collagen Nanocomposite for Visible Light Photocatalytic Degradation of Nano Plastics

Subbiah,

Palanisamy

2024

Advanced Sustainable Systems

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Nano and micro plastics are harmful to the aqueous environment and the current treatment systems are either ineffective or expensive, which restricts their widespread use. In this research, reduced graphitic carbon oxide (rGO)‐Cu nanoparticles crosslinked with collagen support (rGO‐Cu/Coll) are employed as an efficient photocatalyst for the degradation of polystyrene (PS) nano plastics in water. It is shown that rGO‐Cu/Coll nanocomposite can degrade PS nano plastics when subjected to simulated visible light and direct sunlight. In the photocatalytic degradation of PS nano plastics, the reactive radical species (•OH and O2•−) produced on the surfaces of rGO‐Cu/Coll nanocomposite materials play major roles in de‐polymerization. The investigation of the FESEM, Raman, and UV–vis spectra of the irradiated and non‐irradiated samples reveal observable changes, including the distorted morphology and formation of a new band, with longer exposure times and greater degradation. Additionally, evidence for the photodegradation of PS chains is demonstrated by the observed increase in the intensities of the carboxylate, carbonyl, and hydroxyl absorption regions of the ATR‐FTIR spectra. The study provides a simple approach to the battle against plastic pollution in aquatic ecosystems using green photocatalysts under visible light including direct sunlight without consuming additional energy.

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Synthesis and characterization of calcium-containing polyurethane using calcium lactate as a chain extender

Cited by 11 publications

References 27 publications

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

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

Electrospun biodegradable calcium containing poly(ester‐urethane)urea: Synthesis, fabrication, in vitro degradation, and biocompatibility evaluation

Harnessing Protein Waste into Reduced Graphitic Carbon Oxide‐Copper‐Collagen Nanocomposite for Visible Light Photocatalytic Degradation of Nano Plastics

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