Synthesis and characterization of castor oil-based branched polyols from renewable resources and their polyurethane-urea coatings

Allauddin, Shaik; Baidya, Kabir; Nehete, Kirankumar M.; Shyamroy, Subarna

doi:10.1007/s11998-018-0118-8

Cited by 7 publications

(3 citation statements)

References 51 publications

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“…This broad characteristic peak indicates the presence of Ti–O stretching mode of BTO. From Figures 4(A),(B), it is observed that castor oil‐based PU and CPBT composite films exhibit aliphatic –CH 3 and –CH 2 – group stretching vibration bands at 3000 cm −1 and 2850 cm −1 along with –CH 2 – bending vibrations at 1360 cm −1 62,63 . The absence of ‐NCO peak from all the CPBT FTIR analysis confirms complete curing of all the composite films, and the FTIR spectral peaks of CPBT composites films for all the different BTO volume fraction percentage are identical.…”

Section: Resultsmentioning

confidence: 77%

“…This is due to the presence of –OH functional group present within the backbone of the molecule. The FTIR spectra of the COPU and CPBT films as shown in Figure 4(B) indicate the presence of the urethane characteristic linkage band of –N–H stretching at 3346 cm −1 , urethane carbonyl band of –NH–CO–O– (having secondary amide peaks) and –CO–O– (for ester carbonyl) at 1742 cm −1 , along with peaks of out‐of‐plane stretching of –C–N bonds and out‐of‐plane bending of –N–H bonds at 1526 cm −1 62,63 . As shown in Figure 4(A), the broad characteristic peak between 570 cm −1 and 600 cm −1 is observed in CPBT composites for all compositions.…”

Section: Resultsmentioning

confidence: 93%

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Castor‐oil derived polyurethane/barium titanate piezoelectric smart composite coatings for energy harvesting applications: Prediction and experimental characterization of electro‐elastic properties

Baidya,

Kumar,

Roy

et al. 2024

Polymer Composites

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Sustainable and environment‐friendly polymer composite smart paints/coatings with polyurethane (PU) derived from castor‐oil (CO) as the matrix and barium titanate (BTO) microparticles as piezo‐active inclusions (2, 4, 6, 8, and 10 vol.%) have been prepared employing ultrasonication and solvent casting, followed by contact DC poling method. Relative dielectric constants varied from 5.26 ± 0.37 for pristine COPU to 8.9 ± 0.36 for COPU/10 vol.% BTO composite, at a frequency of 1 kHz. Piezoelectric strain constant d33 of the poled films varied from 0.0 pC/N for pristine castor‐oil based polyurethane (COPU) to 1.2 pC/N for COPU/10 vol.% BTO (CPBT‐5) composite. Tensile tests showed that the elastic modulus varied from 1.98 ± 0.003 MPa for pristine COPU to 5.13 ± 0.02 MPa for COPU/10 vol.% BTO composite. Dynamic mechanical analysis confirmed the viscoelastic nature of the smart paints. Measurement of current–voltage response under different compressive loads indicates that COPU/10 vol.% BTO composite can generate a current of ~28 nA and voltage of ~8 V under a dynamic compressive load of 40 N, applied at a frequency of 1 Hz. These experiments were complemented by Fourier transform infra‐red spectroscopy and scanning electron microscopy. In addition, finite element analyses based on periodic boundary conditions have been performed to predict the effective electro‐elastic properties of these piezoelectric smart composite coatings.Highlights Castor‐oil‐based PU piezoelectric composites with BTO inclusions were developed. Increase in BTO content up to 10 vol.% increases dielectric constant by ~1.7 times. COPU/BTO composites exhibit significantly increased piezoelectric response. Elastic and viscoelastic properties are also enhanced with increasing BTO content. Finite element models show a good match with experimental results.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 93%

Castor‐oil derived polyurethane/barium titanate piezoelectric smart composite coatings for energy harvesting applications: Prediction and experimental characterization of electro‐elastic properties

Baidya,

Kumar,

Roy

et al. 2024

Polymer Composites

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“…7 Modified castor oil is mostly preferred for synthesis of branched polyurethane structure. 8 Automobile paints are in general polyurethane based which consists of urethane linkage. Urethane linkage is a polymerization of polyol and isocyanate.…”

Section: Introductionmentioning

confidence: 99%

Bio-based polyurethane coating synthesized from modified castor oil - applicable in base coat of automobile paint

Mohanty

Kanny

Mohanty³

et al. 2022

SATNT

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The current study reports the epoxidation of castor oil (CO) by using hydrogen peroxide as catalyst and formic acid as oxidizing agent. Subsequently bio based polyurethane based base coat was synthesized by using epoxidised castor oil (ECO) as polyol, Isophorone diisocyanate (IPDI) as curing agent and dibutylin dilaurate (DBTDL) as catalyst. The paint formulation with OH:NCO ratio 1:1.2 was optimized. An independent study was carried out employing the mechanical test like cross-cut tape test was carried out to evaluate th paint properties. Morphological and structural studies like FTIR, SEM, HNMR were carried out with the paint formulation. Thermal property studies like TGA, DSC were carried out with the paint. Gloss, weather resistance of the paint was evaluated.

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Natural polyhydroxy resins in surface coatings: a review

et al. 2022

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Synthesis and characterization of castor oil-based branched polyols from renewable resources and their polyurethane-urea coatings

Cited by 7 publications

References 51 publications

Castor‐oil derived polyurethane/barium titanate piezoelectric smart composite coatings for energy harvesting applications: Prediction and experimental characterization of electro‐elastic properties

Castor‐oil derived polyurethane/barium titanate piezoelectric smart composite coatings for energy harvesting applications: Prediction and experimental characterization of electro‐elastic properties

Bio-based polyurethane coating synthesized from modified castor oil - applicable in base coat of automobile paint

Natural polyhydroxy resins in surface coatings: a review

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