Synthesis and characterization of polyurethane–organoclay nanocomposites based on renewable castor oil polyols

Alaa, M. A.; Yusoh, Kamal; Hasany, S. F.

doi:10.1007/s00289-014-1255-6

Cited by 28 publications

(30 citation statements)

References 44 publications

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“…FTIR spectroscopy is widely used to study the extent of hydrogen bonding in polymers. [19] However in the spectra of nanocomposites the -C=O stretching band shifted from 1,719 to 1,711 cm −1 and N-H bending vibration peak shifted from 1,540 to 1,533 cm −1 . Two Peaks shown at 1,719 and 1,540 cm −1 which correspond to -C=O stretching and -N-H bending vibration of urethane linkages.…”

Section: Results and Discussion 31 | Ftir Studymentioning

confidence: 87%

“…In the spectra of clay nanocomposites the characteristic peaks at 522 and 1,032 cm −1 corresponding to the Al-O stretching vibration and Si-O-Si stretching vibration were observed. [19] However in the spectra of nanocomposites the -C=O stretching band shifted from 1,719 to 1,711 cm −1 and N-H bending vibration peak shifted from 1,540 to 1,533 cm −1 . This confirms the interaction of Cloisite 30B clay with PU chains.…”

Section: Results and Discussion 31 | Ftir Studymentioning

confidence: 87%

“…The neat C30B showed an intense diffraction peak at 2θ = 4.9° corresponds to the basal spacing of 1.9 nm. [19,20] This strong peak disappeared in the WAXD spectra of the nanocomposite films. The disappearance of the WAXD peak suggested that the polymer chains are intercalated into the galleries of the organoclay and provided delamination of the clay layers that led to the well nanoscale dispersion of the organoclay in the PU/C30B nanocomposites.…”

Section: Waxd Studymentioning

confidence: 95%

“…WAXD is a potential tool to better estimate the distance between the two layers and to confirm the dispersion behaviour of C30B in PU matrix. [19] The homogenous dispersion of C30B within PU is due to the formation of strong hydrogen bonding, polar-polar interactions between -C=O groups of PU and OH groups in C30B. The neat C30B showed an intense diffraction peak at 2θ = 4.9° corresponds to the basal spacing of 1.9 nm.…”

Section: Waxd Studymentioning

confidence: 98%

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Mechanical, thermal and accelerated weathering studies of bio‐based polyurethane/clay nanocomposites coatings

et al. 2017

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Biobased polymer has taken tremendous attention in recent times. In the present study bio-based polyurethane have been synthesized from the vegetable oil i.e., dehydrated castor oil, 1,4-butanediol and isophorone diisocyanate in presence of a catalyst by solution polymerization method. Then polyurethane nanocomposites were synthesized using different amount of nanoclay (C30B) (1, 3 and 5 wt%). The synthesis of polyurethane and its nanocomposites were confirmed by FTIR and XRD analysis. The mechanical properties such as tensile strength (2.2-4.5 MPa), elongation at break (299%-435%) hardness (46-70) and abrasion resistance (351-201 mg/1,000 cycles) increased with the increase of nanoclay content. The initial thermal degradation temperature found to increase from (220 to 290°C) with the increase of nanoclay content in the nanocomposites. The nanoclay was interacted with the hard segment of the matrix polymer as reflected from the atomic force microscopy studies. Weathering study revealed that nanocomposites have higher weather resistance capacity than pristine polyurethane. It can be concluded that the prepared nanocomposites might be good outdoor topcoat materials. K E Y W O R D Smechanical properties, polyurethane, vegetable oil, weather resistance 1956 |

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Section: Results and Discussion 31 | Ftir Studymentioning

confidence: 87%

Section: Results and Discussion 31 | Ftir Studymentioning

confidence: 87%

Section: Waxd Studymentioning

confidence: 95%

Section: Waxd Studymentioning

confidence: 98%

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Mechanical, thermal and accelerated weathering studies of bio‐based polyurethane/clay nanocomposites coatings

et al. 2017

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“…Properties of PUs based on CO can be improved through incorporation of nanofillers as nanoclays to make polymeric nanocomposites . Nanocomposites are a unique class of materials that can be prepared by ultrafine dispersion of nanofillers within the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of bio‐based polyurethanes obtained from castor oil and poly (3‐hydroxybutyrate) and their nanocomposites

2017

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Bio‐based polyurethanes (PUs) were synthesized from castor oil (CO) and poly(3‐hydroxybutyrate)‐diol (PHB‐diol) using 1,6‐hexamethylene diisocyanate, as nontoxic connecting agent. The PHB content in the obtained PUs was adjusted from 0 to 60.0 wt%. The synthesis was carried out by one pot solution polymerization. PUs nanocomposites loaded with different contents of cloisite®25A (C25A) were prepared by means of in situ solution polymerization. The molecular structure of the obtained PUs was confirmed by FT‐IR. The thermal properties of the neat PUs and the resulting nanocomposites were investigated using DSC and TGA. It was found that the cold crystallization of the PHB component was enhanced, while its melt crystallization was retarded with increasing its own content in the PUs. The incorporated C25A in the PU matrix shifted the cold crystallization peak to higher temperature. TGA studies reveal that neat PUs and nanocomposites exhibited three main decompositions steps. The thermal stability of the neat PUs decreased with increasing the PHB content and increased with increasing the C25A content. Tensile mechanical testing revealed that increasing the content of the PHB and C25A made the PUs rigid and strong. The elastic modulus and ultimate tensile strength of the neat PUs were found to increase with increasing the PHB content and enhanced with incorporation of C25A, while the elongation decreased with increasing the PHB and C25A content. The equilibrium swelling in 1,2‐dichloroethane decreased with increasing both the PHB and C25A content in PU matrix. POLYM. COMPOS., 39:E489–E499, 2018. © 2017 Society of Plastics Engineers

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Synthesis and properties of castor oil‐based polyurethane containing short fluorinated segment

Cheng

Lee

et al. 2020

J of Applied Polymer Sci

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This study successfully incorporated a short‐segment fluorine‐containing chain extender (2,2,3,3‐tetrafluoro‐1,4‐butanediol [TF]) into castor oil‐based polyurethane (COPU) to synthesize TF/COPUs. The interactions between TF and COPU components were identified by Fourier transform infrared and X‐ray photoelectron spectroscopies, the results revealed that the increase in the TF content increased the van der Waals forces in CF…CO and the hydrogen bonding force in CF…HN. Atomic force microscopy indicated that the addition of more TF contributed to a higher level of microphase separation in the TF/COPUs. Thermogravimetric analysis showed that the TF component can enhance the thermal resistance of TF/COPUs. Differential scanning calorimetry and dynamic mechanical analysis indicated that the glass transition temperature (Tg) of TF/COPUs increased with the TF content. The stress–strain testing showed that the tensile strength and elongation at break values decreased with the TF content. This tensile behavior may be due to the molecular weight of a TF/COPU decreased with the TF content as evidenced by the gel permeation chromatography results. The hydrolytic degradation tests of dipping TF/COPUs in 3 wt% NaOH solution indicated that TF could lower the surface free energy and enhance the degradation stability of TF/COPUs.

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Synthesis and characterization of polyurethane–organoclay nanocomposites based on renewable castor oil polyols

Cited by 28 publications

References 44 publications

Mechanical, thermal and accelerated weathering studies of bio‐based polyurethane/clay nanocomposites coatings

Mechanical, thermal and accelerated weathering studies of bio‐based polyurethane/clay nanocomposites coatings

Preparation and characterization of bio‐based polyurethanes obtained from castor oil and poly (3‐hydroxybutyrate) and their nanocomposites

Synthesis and properties of castor oil‐based polyurethane containing short fluorinated segment

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