Preparation, characterization, and thermal studies of γ-Fe2O3 and CuO dispersed polycarbonate nanocomposites

Lagashetty, Arunkumar; Vijayanand, H.; Basavaraja, S.; Bedre, Mahesh D.; Venkataraman, A.

doi:10.1007/s10973-009-0475-8

Cited by 30 publications

(16 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The proton spin-lattice relaxation time in the rotating frame T 1q (H) was indirectly determined, with the variable spin lock (VSL) pulse sequence, by the carbon nucleus observation using a 90°-s-spin-lock pulse sequence prior to crosspolarization [17]. The data acquisition was performed by 1 H decoupling with a delay time, s, ranging from 0.1 to 7.5 ms and a contact time of 1.5 ms. The proton spin-lattice relaxation time in the laboratory frame T 1 (H) was determined, using the saturation recovery pulse sequence [18], by the carbon nucleus observation using a 90°-s-90°pulse sequence prior to cross polarization with a delay time s ranging from 0.01 to 3 s. The 13 C spin-lattice relaxation time in the rotating frame T 1q (C) was determined, with the variable spin lock (VSL) pulse sequence, applying the spin-lock pulse after the cross-polarization on the carbon channel [17].…”

Section: Analysis Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the modification, induced by zirconia nanoparticles, on the structure and properties of polycarbonate

Motaung

Saladino

Luyt

et al. 2013

European Polymer Journal

View full text Add to dashboard Cite

a b s t r a c tMelt compounding was used to prepare polycarbonate (PC)-zirconia nanocomposites with different amounts of zirconia. The effect of the zirconia loading, in the range of 1-5 wt.%, on the structure, mechanical properties and thermal degradation kinetics was investigated. The zirconia nanoparticle aggregates were well dispersed in the PC matrix and induced the appearance of a local lamellar order in the polycarbonate as inferred by SAXS findings. This order could be a consequence of the intermolecular interactions between zirconia and the polymer, in particular with the quaternary carbon bonded to the methyl groups and the methyl carbon as inferred from the NMR results. The presence of zirconia caused a decrease in the storage and loss moduli below the glass transition temperature. However, the highest amount of zirconia increased the modulus. The presence of zirconia in PC slightly increased the thermal stability, except for the highest zirconia content which showed a decrease. The activation energies of thermal degradation for the nanocomposites were significantly lower than that for pure PC at all degrees of conversion.

show abstract

Section: Analysis Methodsmentioning

confidence: 99%

“…PC nanocomposites have shown potential applications in UV protecting sheets and films [1][2][3][4]. There are a number of recent papers reporting on the mechanical properties, thermal stability and flame retardancy of PC nanocomposites containing different metal oxide nanoparticles [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influence of the modification, induced by zirconia nanoparticles, on the structure and properties of polycarbonate

Motaung

Saladino

Luyt

et al. 2013

European Polymer Journal

View full text Add to dashboard Cite

show abstract

“…The incorporation of small amounts of metal oxide nanoparticles into the polymer matrices was found to remarkably improve dimensional stability, and the mechanical, thermal, optical, electrical, and gas barrier properties, as well as to decrease the flammability [1][2][3][4][5][6]. PC-silica nanocomposites, prepared by various methods, attracted the attention of many institutions due to their improved transparency and mechanical properties [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…The proton spin-lattice relaxation time in the rotating frame T 1q (H) was indirectly determined, with the variable spin lock (VSL) pulse sequence, by the carbon nucleus observation using a 90°-s-spin-lock pulse sequence prior to cross-polarization [15]. The data acquisition was performed by 1 H decoupling with a delay time, s, ranging from 0.1 to 7.5 ms and a contact time of 1.5 ms. The proton spin-lattice relaxation time in the laboratory frame T 1 (H) was determined, using the saturation recovery pulse sequence [16], by a carbon nucleus observation using a 90°-s-90°pulse sequence prior to cross polarization with a delay time s ranging from 0.01 to 3 s. The 13 C spin-lattice relaxation time in the rotating frame T 1q (C) was determined, with the variable spin lock (VSL) pulse sequence, applying the spin-lock pulse after the cross-polarization on the carbon channel [15].…”

mentioning

confidence: 99%

“…The proton spin-lattice relaxation time in the laboratory frame T 1 (H) was determined, using the saturation recovery pulse sequence [16], by a carbon nucleus observation using a 90°-s-90°pulse sequence prior to cross polarization with a delay time s ranging from 0.01 to 3 s. The 13 C spin-lattice relaxation time in the rotating frame T 1q (C) was determined, with the variable spin lock (VSL) pulse sequence, applying the spin-lock pulse after the cross-polarization on the carbon channel [15]. The data acquisition was performed by 1 …”

mentioning

confidence: 99%

See 1 more Smart Citation

The effect of silica nanoparticles on the morphology, mechanical properties and thermal degradation kinetics of polycarbonate

Motaung

Saladino

Luyt

et al. 2012

Composites Science and Technology

View full text Add to dashboard Cite

a b s t r a c tPolycarbonate/silica nanocomposites with different silica quantities were prepared by a melt compounding method. The effect of silica amount, in the range 1-5 wt.%, on the morphology, mechanical properties and thermal degradation kinetics of polycarbonate (PC) was investigated. Clusters of silica nanoparticles were well dispersed in the polycarbonate whose structure remained amorphous. NMR results showed intermolecular interactions involving the carbonyl groups of different polymeric chains which did not affect the intramolecular rotational motions. The presence of the lowest silica content showed a decrease in the storage and loss moduli below the glass transition temperature, probably due to a plasticization effect. However, an increase in the amount of silica increased the moduli. The presence of silica in PC slightly increased the thermal stability, except for the highest silica content which showed a decrease. The activation energies of thermal degradation for the nanocomposites depended on the amount of silica and on the degree of conversion.

show abstract

Polycarbonate/silica nanocomposite membranes: Fabrication, characterization, and performance evaluation

Idris

Man

Maulud

2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polycarbonate/silica nanocomposite membranes at low silica loading were fabricated by solution blending and solvent evaporation technique. The functionalized silica nanoparticles used were synthesized by co-condensing hydrolyzed tetraethylorthosilicate with 3-aminopropyl trimethoxysilane in the sol-gel process. The membranes morphology, composition, surface, structure, thermal and mechanical properties were analyzed by the standard characterization techniques. The gas permeation tests were conducted in four-channel permeation cells. Field emission scanning electron microscopy results reveal that membranes above 3 wt % silica content formed distinguishable voids and agglomerates. Fair distribution of silica nanoparticles and absence of residual solvents were observed by energy dispersive X-ray and thermogravimetric analysis. Fourier transform infrared spectroscopy spectra confirmed the presence of new functional groups (NAH) and (OAH) bonds. The X-ray diffraction pattern revealed the polymer-particle interactions, the formation of rigidified polymer chain, and nanostructured silicon crystals. Further, the thermogravimetric analysis results revealed thermal stability enhancement while differential scanning calorimetry results of increased glass transition temperatures confirmed the presence of rigidified polymer chain. Furthermore, enhancements in mechanical strength of the membranes were observed. Moreover, at all feed pressures, increased CO 2 , N 2 , and CH 4 gas permeation was observed. At 6 bar feed pressure, the CO 2 /N 2 and CO 2 /CH 4 ideal selectivities of PC membranes with 3 wt % silica loading have increased from 19.2 to 38.0 and 29.2, respectively.

show abstract

Preparation, characterization, and thermal studies of γ-Fe2O3 and CuO dispersed polycarbonate nanocomposites

Cited by 30 publications

References 21 publications

Influence of the modification, induced by zirconia nanoparticles, on the structure and properties of polycarbonate

Influence of the modification, induced by zirconia nanoparticles, on the structure and properties of polycarbonate

The effect of silica nanoparticles on the morphology, mechanical properties and thermal degradation kinetics of polycarbonate

Polycarbonate/silica nanocomposite membranes: Fabrication, characterization, and performance evaluation

Contact Info

Product

Resources

About