Preparation of polyamide 6/silica nanocomposites from silica surface initiated ring-opening anionic polymerization

Yang, Mei; Gao, Ye; He, Jiangping; Li, H. M.

doi:10.3144/expresspolymlett.2007.61

Cited by 30 publications

(20 citation statements)

References 32 publications

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“…TDI, as a bi‐functional organic compound, possesses two isocyanate groups with different activities at para and ortho positions. The para ‐isocyanate groups of TDI reacted with accessible hydroxyl groups on the surface of nano‐TiO 2 preferentially to form urethane bond and ortho ‐positions were preserved owing to the steric hindrance in the TDI molecule . The isocyanate groups that remained unreacted were then reduced and converted to amine groups with water.…”

Section: Resultsmentioning

confidence: 99%

Novel type of SO₃H–functionalized nano‐titanium dioxide as a highly efficient and recyclable heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans

Shamsi

Amoozadeh

Sajjadi

et al. 2016

Applied Organom Chemis

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n-Butylsulfonated nano-titania (n-TiO 2 -NH-(CH 2 ) 4 -SO 3 H) as a highly efficient and reusable nanocatalyst was prepared by grafting 2,4-toluene diisocyanate as a bi-functional covalent linker onto a nano-titania support, followed by reduction and then ring opening-reaction of the synthesized amine with 1,4-butanesultone. Fourier transform infrared spectroscopy, X-ray diffraction, field-emission scanning electron microscopy and thermogravimetric analysis were used to characterize the catalyst. The catalytic activity of n-TiO 2 -NH-(CH 2 ) 4 -SO 3 H was evaluated in the synthesis of tetrahydrobenzo[b]pyrans, which affords high yields. Statistical experimental design was applied as an efficient and powerful method to achieve the optimal conditions for this catalytic reaction leading to high yield. Moreover, the catalyst was recovered and reused at least six times without a significant decrease in catalytic activity.

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Section: Resultsmentioning

confidence: 99%

Novel type of SO₃H–functionalized nano‐titanium dioxide as a highly efficient and recyclable heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans

Shamsi

Amoozadeh

Sajjadi

et al. 2016

Applied Organom Chemis

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“…The calix [4]arene variability of ion selectivity and ability to substitute with different molecules are due to their special structure including holes with definite size. Additionally, they are often used as host molecule to trap ions and molecules [14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Application of sulfonamide derivative of calixarene for improvement of mechanical properties and thermal stability of polyurethane composite

Taghvaei-Ganjali

Rasouli-Saniabadi

Mirmoeini

2015

J Incl Phenom Macrocycl Chem

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A calixarene derivative, 5,11,17,23-tetrakis (hydroxyl ethyl sulfonamide) calix [4]arene, was synthesized through a linear reaction from parent calix [4]arene. This sulfonamide calixarene derivative was used as a precursor to produce calixarene-polyurethane composite. Structural properties of calixarene-based synthesized precursors were studied using spectroscopic techniques such as 1 H-NMR, 13 C-NMR, and IR. Also, mechanical properties of produced polyurethane composite such as fracture elongation, modulus, and tensile strength were studied which indicated that these properties were deeply dependent upon calixarene ratio in composite. An increase in calixarene ratio resulted in a decrease the fracture elongation. In contrast, an increase in calixarene ratio caused a considerable decrease of modulus and tensile strength. The modulus and tensile strength were increased by 16.98 and 20 % as the calixarene/polyol ratio reached 3 %. Finally, TGA and DSC studies showed that calixarene ratio considerably enhanced the thermal stability of polyurethane.

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“…Researchers have come up with a new approach on casting which is based on the ring opening polymerization. The new casting process has two advantages under production: the process is faster and there is no water secession [1][2][3][4][5]. The sodium catalysed cast PA6 are being extensively used in the semi-finished material production such as bar, tubes, sheets.…”

Section: Introductionmentioning

confidence: 99%

Influence of Graphite Additives on Mechanical, Tribological, Fire Resistance and Electrical Properties in Polyamide 6

2018

Teh. vjesn.

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New types of polymers are usually produced with different additives. In this work, the effect of graphite addition (1.5wt%, 2wt%, 2.5wt%, 3wt% and 3.5wt%) on material's properties is analysed. Results of current investigation show that there are two possible subtypes (groups) of polyamide, containing 2% and 3.5% graphite, which reveal improved complex properties. By using graphite additives, the material becomes stiffer. In polyamide-2% graphite system, the abrasive wear tends to decrease while the fire resistance improves without significant changes in mechanical properties. In addition to improved tribological and fire resistance behaviour, polyamide with 3.5% graphite addition gains excellent antistatic properties. At the same time, in this material both the tensile and the Charpy impact strengths have decreased by 15% and 30%, respectively, whereas the Young's modulus increases by 6% as a result of dispergation/adhesion between the graphite and polymer.

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Preparation of polyamide 6/silica nanocomposites from silica surface initiated ring-opening anionic polymerization

Cited by 30 publications

References 32 publications

Novel type of SO₃H–functionalized nano‐titanium dioxide as a highly efficient and recyclable heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans

Novel type of SO₃H–functionalized nano‐titanium dioxide as a highly efficient and recyclable heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans

Application of sulfonamide derivative of calixarene for improvement of mechanical properties and thermal stability of polyurethane composite

Influence of Graphite Additives on Mechanical, Tribological, Fire Resistance and Electrical Properties in Polyamide 6

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Preparation of polyamide 6/silica nanocomposites from silica surface initiated ring-opening anionic polymerization

Cited by 30 publications

References 32 publications

Novel type of SO3H–functionalized nano‐titanium dioxide as a highly efficient and recyclable heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans

Novel type of SO3H–functionalized nano‐titanium dioxide as a highly efficient and recyclable heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans

Application of sulfonamide derivative of calixarene for improvement of mechanical properties and thermal stability of polyurethane composite

Influence of Graphite Additives on Mechanical, Tribological, Fire Resistance and Electrical Properties in Polyamide 6

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Novel type of SO₃H–functionalized nano‐titanium dioxide as a highly efficient and recyclable heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans

Novel type of SO₃H–functionalized nano‐titanium dioxide as a highly efficient and recyclable heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans