Preparation, characterization and infrared emissivity study of helical polyurethane@SiO2 core-shell composite

Wang, Zhiqiang; Zhou, Yuming; Yao, Qingzhao; Sun, Yanqing

doi:10.1016/j.apsusc.2009.08.096

Cited by 18 publications

(3 citation statements)

References 25 publications

(23 reference statements)

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“…These diffraction patterns are thoroughly in accordance with those that are reported in the literature for pure ODA-PMDA PI 25 and nano-SiO 2 particles. 26…”

Section: Resultsmentioning

confidence: 99%

“…These diffraction patterns are thoroughly in accordance with those that are reported in the literature for pure ODA-PMDA PI 25 and nano-SiO 2 particles. 26 Diffuse reflectance UV spectroscopy Figure 4 represents DR UV-vis spectra of PI/SiO 2 and PI/ SiO 2 *NH 2 nanocomposites compared with that of neat poly(4,4 0 -oxydiphenylene-pyromellitimide). The spectra of MDI modifier as well as MDI-treated SiO 2 nanoparticles are also shown.…”

Section: Xrd Analysismentioning

confidence: 99%

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Poly(4,4′-oxydiphenylene-pyromellitimide) loaded by NH₂-functionalized silica

Behniafar

Haghighi‐Yazdi

Farshad

et al. 2016

High Performance Polymers

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In this research, silica nanopowder is surface modified via a facile urethanation reaction to obtain silicon dioxide (SiO 2 ) nanoparticles possessing amine (NH 2 )-functionalized organic moieties. Poly(4,4 0 -oxydiphenylene-pyromellitimide) as one of the most widely used polyimides (PIs) is then uniformly loaded by these organically modified nanoparticles (approximately 5% by weight) during its synthesis process at the thermal cyclodehydration stage of the corresponding poly(amic acid) precursor. Amine-functionalized SiO 2 nanoparticles (SiO 2 *NH 2 ) and the resulting PI-based nanocomposites (PI/ SiO 2 and PI/SiO 2 *NH 2 ) are thoroughly characterized by Fourier transform infrared spectroscopy, diffuse reflectance ultraviolet-visible, X-ray diffraction, and scanning electron microscopy. Thermogravimetric analyses/derivative thermogravimetry thermograms obviously show that about 22% (by weight) of the nano-SiO 2 particles is formed by organic moieties. Moreover, the thermostability order is found to be PI/SiO 2 > PI/SiO 2 *NH 2 > neat PI. The nanocomposite PI/ SiO 2 *NH 2 shows a two-step thermal decomposition pattern; the first step is due to the scission of the organic part from the nanoparticles loaded. According to the slope changes of the differential thermal analyses curves, the first-order phase transition could be found at the thermal range of 300-400 C. This transition, however, is not so clear for PI/SiO 2 and PI/ SiO 2 *NH 2 nanocomposites due to the interaction of nano-SiO 2 particles with PI matrix.

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“…These diffraction patterns are thoroughly in accordance with those that are reported in the literature for pure ODA-PMDA PI 25 and nano-SiO 2 particles. 26…”

Section: Resultsmentioning

confidence: 99%

Section: Xrd Analysismentioning

confidence: 99%

Poly(4,4′-oxydiphenylene-pyromellitimide) loaded by NH₂-functionalized silica

Behniafar

Haghighi‐Yazdi

Farshad

et al. 2016

High Performance Polymers

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“…The presence and distribution of SiO 2 nano particles in the polyurethane membranes has been studied by SEM. The properties of polyurethane/ SiO 2 composite are largely related to the dispersion of particles in resin [4] . Fig.…”

Section: Morphology Of Polyurethane/sio 2 Nanocompositementioning

confidence: 99%

The Dynamical Property and Abrasion Performance of Polyester Polyurethane/SiO<sub>2</sub> Nanocomposite

Shi

2013

AMR

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Polyester based polyurethane/ SiO2 nanocomposites having the starting nNCO/nOH=2:1 and different concentrations of SiO2 nanoparticles (0, 0.2, 0.5, 1.0 and 2.0 wt %) have been prepared. The morphology, dynamical property and abrasion performance were analyzed using scanning electron microscopy, DMA and DIN abrasion tester separately. The results showed SiO2 uniformally dispersed in the composite. By adding nano SiO2 into the elastomers, the 300% modulus, tensile strength, die C tear of the composite were increased but the elongation and rebound decreased. With the increase of the SiO2 adding amount, tanδ of the composite increased gradually, the abrasion performance increased first and the declined.

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Highly Active and Green Aminopropyl-Immobilized Phosphotungstic Acid on Mesoporous LaSBA-15 for Alkylation of O-xylene with Styrene

et al. 2012

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The Keggin phosphotungstic acid, H 3 PW 12 O 40 (HPW), was successfully immobilized on the surface of mesostructured LaSBA-15 by means of chemical bonding to aminosilane groups. The catalysts were characterized by elemental analysis, N 2 adsoption, TEM, DRS-UV, and FTIR spectroscopy. Characterization results suggest that the surface area decreased after grafting amino groups to silica and the structures of heteropolyanions on aminemodified LaSBA-15 was maintained. Their catalytic behaviors were investigated in the alkylation of o-xylene with styrene. Among the functionalized catalysts, when the content of amino-groups was suitable, it had the best catalytic performances in terms of yield and stability. It is worth mentioning that the catalysts could be used repeatedly without loss of the activity and selectivity during several catalytic cycles. The good stability can be attributed to the strong interaction between the amino groups on the surface of LaSBA-15 and HPW anions.

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Preparation, characterization and infrared emissivity study of helical polyurethane@SiO2 core-shell composite

Cited by 18 publications

References 25 publications

Poly(4,4′-oxydiphenylene-pyromellitimide) loaded by NH₂-functionalized silica

Poly(4,4′-oxydiphenylene-pyromellitimide) loaded by NH₂-functionalized silica

The Dynamical Property and Abrasion Performance of Polyester Polyurethane/SiO<sub>2</sub> Nanocomposite

Highly Active and Green Aminopropyl-Immobilized Phosphotungstic Acid on Mesoporous LaSBA-15 for Alkylation of O-xylene with Styrene

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Preparation, characterization and infrared emissivity study of helical polyurethane@SiO2 core-shell composite

Cited by 18 publications

References 25 publications

Poly(4,4′-oxydiphenylene-pyromellitimide) loaded by NH2-functionalized silica

Poly(4,4′-oxydiphenylene-pyromellitimide) loaded by NH2-functionalized silica

The Dynamical Property and Abrasion Performance of Polyester Polyurethane/SiO<sub>2</sub> Nanocomposite

Highly Active and Green Aminopropyl-Immobilized Phosphotungstic Acid on Mesoporous LaSBA-15 for Alkylation of O-xylene with Styrene

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Product

Resources

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Poly(4,4′-oxydiphenylene-pyromellitimide) loaded by NH₂-functionalized silica

Poly(4,4′-oxydiphenylene-pyromellitimide) loaded by NH₂-functionalized silica