Synthesis and Characterization of Cardo Bisbenzoxazines and their Thermal Polymerization

Ghetiya, R. M.; Kundariya, Dinesh S.; Parsania, P. H.; Patel, V. A.

doi:10.1080/03602550802188813

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…The difference between the weight reduction of the as-synthesized Si NC and the calcined nanocontainers is approximately 27% and mostly originates from thermal degradation of residual TEOS and traces of surfactant. The plot corresponding to Si NC-PhPh shows a similar profile from room temperature until 300 • C, but then an additional mass reduction can be observed in the temperature range from 350 to 500 • C. Around 10% of the observed weight loss can be attributed to the selective degradation that occurs preferentially from relatively weak bonds (C-N and C-O) to form free radicals, which undergo a variety of reactions, such as recombination, rearrangement, degradation, etc, and further degradation at elevated temperatures is attributed to PhPh [13] and to part of TEOS degradation. The following step from 530 • C until 800 • C is completely attributed to PhPh degradation.…”

Section: Encapsulation Of Phenolphthalein In Si Ncmentioning

confidence: 99%

Nanocontainer-based corrosion sensing coating

et al. 2013

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The present paper reports on the development of new sensing active coating on the basis of nanocontainers containing pH-indicating agent. The coating is able to detect active corrosion processes on different metallic substrates. The corrosion detection functionality based on the local colour change in active cathodic zones results from the interaction of hydroxide ions with phenolphthalein encapsulated in mesoporous nanocontainers which function as sensing nanoreactors. The mesoporous silica nanocontainers are synthesized and loaded with pH indicator phenolphthalein in a one-stage process. The resulting system is mesoporous, which together with bulkiness of the indicator molecules limits their leaching. At the same time, penetration of water molecules and ions inside the container is still possible, allowing encapsulated phenolphthalein to be sensitive to the pH in the surrounding environment and outperforming systems when an indicator is directly dispersed in the coating layer.The performed tests demonstrate the pH sensitivity of the developed nanocontainers being dispersed in aqueous solutions. The corrosion sensing functionality of the protective coatings with nanocontainers are proven for aluminium- and magnesium-based metallic substrates. As a result, the developed nanocontainers show high potential to be used in a new generation of active protective coatings with corrosion-sensing coatings.

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Section: Encapsulation Of Phenolphthalein In Si Ncmentioning

confidence: 99%

Nanocontainer-based corrosion sensing coating

et al. 2013

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“…At the same time, the cyclic structure of phenolphthalein also makes an important contribution to the heat resistance of the resin. R. M. Ghetiya et al [24] synthesized two benzoxazines containing bisphenol C (BCO) and phenolphthalein (PHO) using bisphenol C/phenolphthalein, formaldehyde, and aniline. The residual percentage of the phenolphthalein samples (56-67%) was significantly higher than that of the bisphenol C samples (20-25%) at 550 • C. Above all, the above work is still difficult to meet the usage needs in the high-end field.…”

Section: Introductionmentioning

confidence: 99%

The Performance and Synthesis of Alkynyl−Functionalized Benzoxazine Containing Phthalide Side Groups and Cyano Groups with Different Molecular Weights

Kang,

Yang,

Xiong

et al. 2023

Polymers

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Benzoxazine resins are widely employed in a variety of applications due to their exceptional heat resistance and treatment properties. However, traditional benzoxazine resins still confront hurdles in today’s engineering applications, such as their inability to provide long-term service in high-temperature settings and their inadequate toughness. In this study, four alkyne-functionalized benzoxazines with phthalide side groups and cyano groups of varying molecular weights were produced. Fourier transform infrared spectroscopy (FT-IR) and hydrogen nuclear magnetic resonance spectroscopy (1H-NMR) were used to characterize the resin structure, and differential scanning calorimetry (DSC) was used to investigate the thermal curing kinetics at different warming rates. The apparent activation energy was 116.9 kJ/mol. In-situ FT-IR was used to investigate the cure mechanism. Dynamic mechanical analysis (DMA) was used to evaluate the gelation time of BOZ series resins at various temperatures, and the curing process was designed by combining the results with DSC. The Tg of the composites made using BOZ-1N21 as the matrix was 336 °C, which was much higher than the Tg of the BP-a resin made with aniline, phenolphthalein, and formaldehyde (Tg = 251 °C). As a result, the resin system is expected to be employed in applications requiring high-temperature resistance and toughness.

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“…Polybenzoxazines are formed by thermally activated ring opening polymerization of the corresponding monomers without using any catalysts [13][14][15][16][17] . Varieties of polybenzoxazine based materials, their preparation, properties and applications have been reported in the literature [18][19][20][21][22][23][24][25][26] .…”

mentioning

confidence: 99%

Preparation, Characterization and Properties of Flexible Magnetic Nanocomposites of NiFe₂O₄-polybenzoxazine-LLDPE

Rajput

Rahaman

Sarkhel

et al. 2013

Polymer-Plastics Technology and Engineering

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A simple method for the preparation of magnetic nanocomposites consisting of NiFe 2 O 4 nanoparticles, polybenzoxazine (PB), linear low-density polyethylene (LLDPE) and LLDPE-g-Maleic anhydride (LgM) is described. Composites were prepared by forming benzoxazine-NiFe 2 O 4 nanocomposites followed by melt blending with LLDPE and thermal curing of benzoxazine. The composites were characterized by XRD, DSC and TGA, FT-IR, SEM, UTM and VSM. The saturation magnetization of the composites containing 33.25 wt% NiFe 2 O 4 was 7.72 emu/g and it decreased with decreasing amount of NiFe 2 O 4 in the composite. The composite films exhibited mechanical flexibility as well as magnetic properties.

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Synthesis and Characterization of Cardo Bisbenzoxazines and their Thermal Polymerization

Cited by 9 publications

References 23 publications

Nanocontainer-based corrosion sensing coating

Nanocontainer-based corrosion sensing coating

The Performance and Synthesis of Alkynyl−Functionalized Benzoxazine Containing Phthalide Side Groups and Cyano Groups with Different Molecular Weights

Preparation, Characterization and Properties of Flexible Magnetic Nanocomposites of NiFe₂O₄-polybenzoxazine-LLDPE

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Synthesis and Characterization of Cardo Bisbenzoxazines and their Thermal Polymerization

Cited by 9 publications

References 23 publications

Nanocontainer-based corrosion sensing coating

Nanocontainer-based corrosion sensing coating

The Performance and Synthesis of Alkynyl−Functionalized Benzoxazine Containing Phthalide Side Groups and Cyano Groups with Different Molecular Weights

Preparation, Characterization and Properties of Flexible Magnetic Nanocomposites of NiFe2O4-polybenzoxazine-LLDPE

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Preparation, Characterization and Properties of Flexible Magnetic Nanocomposites of NiFe₂O₄-polybenzoxazine-LLDPE