Synthesis and Characterization of Pyridine-Based Polyurethanes

Reddy, Kakarla Raghava; Raghu, Anjanapura V.; Jeong, Han Mo; Siddaramaiah,

doi:10.1163/156855509x412054

Cited by 64 publications

(39 citation statements)

References 17 publications

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“…Choi et al 2012 [5] prepared nanocomposites of waterborne polyurethane (WPU) reinforced with functionalized graphene sheets (FGSs). Reddy and coworkers, prepared a series of novel segmented polyurethanes (PUs) containing imine units by polyaddition reaction of various diisocyanates like 4,4 -diphenyl-methane diisocyanate (MDI), toluene 2,4-diisocyanate (TDI), isophorone diisocyanate (IDI), and hexamethylene diisocyanate (HDI) with 4,4 -[1,4-phenylenebis(methylylidenenitrilo)]diphenol based diol [6], with 4,4 -{pyridine-2,6-diylbis[nitrilomethylylidene]}diphenol-based diol [10].…”

Section: Introductionmentioning

confidence: 99%

Radiation Crosslinking of Polyurethanes: Characterization by FTIR, TGA, SEM, XRD, and Raman Spectroscopy

Ghobashy

Abdeen

2016

Journal of Polymers

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Gamma radiation can be used for enhancing the physical properties of polyurethane (PU). Radiation was used to crosslink a polyurethane at room temperature; four samples of the PU solid film are irradiated at variable four radiation doses 0, 50, 100, and 150 kGy under vacuum conditions. Crosslinking radiation is more common than oxidative degradation and crosslinking is believed to be more efficient in the soft segment of PU. The structure of the PUs is performed by Fourier transform infrared (FTIR-ATR), Thermogravimetric Analysis (TGA-DTG), and X-ray Diffraction (XRD) which have been used to investigate the effect of gamma radiation on the polyurethane (PU). The results showed that the radiation crosslinking of polyurethanes improved the thermal stability and the crystallinity. The microstructure modifications of polyurethane samples have also been studied as a function of the dose using the scanning electron microscope (SEM). The effects of gamma irradiation on the color changes of polyurethane were observed. The irradiated PUs have conjugated structure and are capable of emitting purple fluorescence.

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Section: Introductionmentioning

confidence: 99%

Radiation Crosslinking of Polyurethanes: Characterization by FTIR, TGA, SEM, XRD, and Raman Spectroscopy

Ghobashy

Abdeen

2016

Journal of Polymers

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“…The cyclic carbonate and amine with aliphatic, cycloaliphatic or aromatic structures are studied, which are similar to the traditional isocyanates. 20 The polypropylene glycol diglycidyl ether (PPGDGE), 21,22 diglycidyl ether of bisphenol A (BADGE), 23 and renewable plant oil 24,25 are the main monomers or oligomers for cyclic carbonate synthesis. For instance, polypropylene glycol diglycidyl ether (PPGDGE) can be obtained from renewable glycerol which is a by-product during the preparation process of biodiesel.…”

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confidence: 99%

Non-isocyanate polyurethane/epoxy hybrid materials with different and controlled architectures prepared from a CO₂-sourced monomer and epoxy via an environmentally-friendly route

Wang

et al. 2017

RSC Adv.

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Polyurethane/epoxy hybrid materials from CO 2 -sourced monomer were prepared via an environmentallyfriendly and non-toxic route, which avioded the use of toxic isocyanate. A series of non-isocyanate polyurethane (NIPU)/epoxy hybrid materials, with different and controlled architectures, were synthesized from CO 2 , polypropylene glycol diglycidyl ether (PPGDGE), amines and diglycidyl ether of bisphenol-A (BADGE). Around 12 wt% CO 2 was incorporated into PPGDGE to form a five-membered cyclic carbonate (5CC-PPGDGE). The complete conversion and selectivity of PPGDGE were obtained.The kinetics of 5CC-PPGDGE was investigated by reacting it with 1,2-ethylenediamine (EDA) at different temperatures. NH 2 -terminated pre-polymers were obtained by reacting 5CC-PPGDGE with various excessive amines. Finally, the hybrid materials were obtained by curing pre-polymers with BADGE. The results showed that a high content of amine with more functional groups led to better mechanical performances than diamine-based hybrid materials. This is the first time that architectures have been controlled by altering the amine ratio and functionality. And these hybrid materials exhibited satisfactory mechanical performances. The DETA-based and TETA-based materials with high amine ratio exhibited a tensile strength of 15.0 MPa and 12.5 MPa, accompanied with elongation at break of 151.3% and 170.9%, respectively. The gel content, glass transition temperature and thermodynamic stability went up first and then declined with the increase of amine ratio, which demonstrated the architectures of hybrid materials ranged from defective to cross-linked and linear structures.

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“…Finally, the weight loss of about 17.4-26.0% occurred in the temperature range of 441-547°C, which can be attributed for the complete decomposition of PUs and MSC filler and liberation of HCN, nitriles of aromatics, carbon dioxide, and ethers. 16 The relative thermal stability of the pristine PU and the PU/MSC composites were evaluated by comparing the decomposition temperature at various percentage weight loss, and these values are tabulated in Table VII. T 0 (temperature of onset decomposition), T 10 , T 20 , and T 50 (temperature for 10, 20, and 50% weight loss) are used to evaluate the thermal stability of the composites.…”

Section: Tga Studiesmentioning

confidence: 99%

“…[13][14][15] Many scientists have studied the properties of the PUs synthesized from variety of polyols and diisocyanates. 14,16,17 This wide range of achievable properties makes PU as an indispensable component in building construction, consumer products, transportation, and medical devices. 18 Incorporation of natural fillers will also enhance the properties such as wear resistance, specific properties, and biodegradability of PUs.…”

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confidence: 99%

Evaluation of Mechanical, Thermal, and Morphological Behaviors of Polyurethane/Mahua Seed Cake Green Composite

et al. 2015

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ABSTRACT:To know the possibility of using Indian butter tree seed waste (mahua seed cake [MSC]) as a filler in the production of value-added product such as polyurethane (PU) green composites, a series of PU composites have been fabricated with varying amounts, namely, 0, 2.5, 5.0, 7.5, and 10 wt%, of MSC, and their effects on the physicomechanical properties such as density, surface hardness, tensile strength, tensile modulus, and percentage elongation at break have been studied. It was found that the tensile strength of the green composites increased from 5.61 to 9.5 MPa and tensile modulus increased from 4.75 to 6.07 MPa with an increase in filler content from 2.5 to 7.5 wt%. The fabricated PU/MSC composites were characterized for structural behavior by Fourier transform infrared spectroscopy and for morphological behaviors by scanning electron microscopy. The chemical resistance of the green composites in different chemical environments has been investigated. The thermal stability and thermal degradation behaviors of composites were performed using thermogravimetric analysis. The microcrystalline parameters such as crystallite size () and lattice strain (g, %) have been computed using wide-angle X-ray scattering data. Based on these parameters, the structure-property relationship of the PU/MSC green composites has been established. C 2015 Wiley Periodicals, Inc. Adv Polym Technol 2015, 0, 21598; View this article online at wileyonlinelibrary.com.

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Synthesis and Characterization of Pyridine-Based Polyurethanes

Cited by 64 publications

References 17 publications

Radiation Crosslinking of Polyurethanes: Characterization by FTIR, TGA, SEM, XRD, and Raman Spectroscopy

Radiation Crosslinking of Polyurethanes: Characterization by FTIR, TGA, SEM, XRD, and Raman Spectroscopy

Non-isocyanate polyurethane/epoxy hybrid materials with different and controlled architectures prepared from a CO₂-sourced monomer and epoxy via an environmentally-friendly route

Evaluation of Mechanical, Thermal, and Morphological Behaviors of Polyurethane/Mahua Seed Cake Green Composite

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Synthesis and Characterization of Pyridine-Based Polyurethanes

Cited by 64 publications

References 17 publications

Radiation Crosslinking of Polyurethanes: Characterization by FTIR, TGA, SEM, XRD, and Raman Spectroscopy

Radiation Crosslinking of Polyurethanes: Characterization by FTIR, TGA, SEM, XRD, and Raman Spectroscopy

Non-isocyanate polyurethane/epoxy hybrid materials with different and controlled architectures prepared from a CO2-sourced monomer and epoxy via an environmentally-friendly route

Evaluation of Mechanical, Thermal, and Morphological Behaviors of Polyurethane/Mahua Seed Cake Green Composite

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Non-isocyanate polyurethane/epoxy hybrid materials with different and controlled architectures prepared from a CO₂-sourced monomer and epoxy via an environmentally-friendly route