Preparation and characterization of nano-hydroxyapatite/polyamide 66 composite GBR membrane with asymmetric porous structure

Li, Jidong; Zuo, Yi; Xianmiao, Cheng; Yang, Weihu; Wang, Huanan; Li, Yubao

doi:10.1007/s10856-008-3664-2

Cited by 52 publications

(46 citation statements)

References 30 publications

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“…Hence, we can say that participation of -OH and -NH forming hydrogen bonding would significantly drop the intensity of -OH group vibration wave number, resulting in the nondetection of -OH in the composite. The same IR spectra were also observed by [23,[38][39][40] for highly filled PA composites. From the results obtained, it is certainly possible for hydrogen bonding to exist between the -OH group in HA and the -NH of PA12.…”

Section: Tensile Strengthsupporting

confidence: 77%

The improvement of mechanical and thermal properties of polyamide 12 3D printed parts by fused deposition modelling

Rahim¹,

Abdullah²,

Akil³

et al. 2017

Express Polym. Lett.

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Abstract. This paper addresses the utilisation of fused deposition modelling (FDM) technology using polyamide 12, incorporated with bioceramic fillers (i.e. zirconia and hydroxyapatite) as a candidate for biomedical applications. The entire production process of printed PA12 is described, starting with compounding, filament wire fabrication and finally, FDM printing. The potential to process PA12 using this technique and mechanical, thermal and morphological properties were also examined. Commonly, a reduction of mechanical properties of printed parts would occur in comparison with injection moulded parts despite using the same material. Therefore, the mechanical properties of the samples prepared by injection moulding were also measured and applied as a benchmark to examine the effect of different processing methods. The results indicated that the addition of fillers improved or maintained the strength and stiffness of neat PA12, at the expense of reduced toughness and flexibility. Melting behaviours of PA12 were virtually insensitive to the processing techniques and were dependent on additional fillers and the cooling rate. Incorporation of fillers slightly lowered the melting temperature, however improved the thermal stability. In summary, PA12 composites were found to perform well with FDM technique and enabling the production of medical implants with acceptable mechanical performances for non-load bearing applications.

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Section: Tensile Strengthsupporting

confidence: 77%

The improvement of mechanical and thermal properties of polyamide 12 3D printed parts by fused deposition modelling

Rahim¹,

Abdullah²,

Akil³

et al. 2017

Express Polym. Lett.

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“…These peaks can probably be related to the stretch vibration of the Si-O-Si group of the clay, since the contributions of PA6 in this particular area are very small. In addition, it was noticed a slight increase in the intensity of these peaks, which can be related to the increase in clay content, used in the preparation of hybrid membranes [38][39][40][41][42] . Also in Figure 2, it was observed typical characteristic bands of formic acid: a broadband at 3300 cm -1 , related to the axial deformation of the O-H group; at 2940 and 2860 cm -1 there are bands related to axial strain of C-H group, which is superimposed with the band of O-H group; and at 1640 cm -1 , there is the axial deformation of the C=O group; the region of 1420 cm -1 is in agreement with the angular deformation of the C-O-H group; at 1256 cm -1 there is a band related to the axial strain of the C-O group and also involves interactions with C-O-H group.…”

Section: Water Permeability and Oil Retentionmentioning

confidence: 97%

Hybrid Membranes of Polyamide Applied in Treatment of Waste Water

et al. 2017

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In this work, it was prepared hybrid membranes of polyamide6 (PA6) with montmorillonite (MMT) and porogenic agent (CaCl 2 ). The hybrid membranes with CaCl 2 were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), porosimetry by mercury intrusion (PMI), flux measurements and rejection. By means of X-ray diffraction, it was revealed that the hybrid membranes with CaCl 2 have an exfoliated and/or partially exfoliated structure. For FTIR and DSC of hybrid membranes with CaCl 2 , it was found that the spectra and the crystalline melting temperature remained virtually unchanged compared to PA6 membrane. From the SEM images, it was observed that the addition of the MMT and the CaCl 2 in the membrane of PA6 caused an increase in the amount of pores the surface and cross section of these membranes. By PMI, it was observed that the presence of MMT and CaCl 2 in the membrane caused an increase in the average diameters of pores. The water-oil separation tests, indicated a significant reduction of oil in the permeate, allowing treatment of wastewater contaminated with oil.

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“…61,62 The α1 peak (2θ = 20.4°) corresponds to the distance between hydrogen-bonded chains, whereas the α2 peak (2θ = 23°) corresponds to the separation of hydrogen-bonded sheets. 61 The absence of the reflections of β phase at 2θ values of ∼12 and 19°or γ1 peak (2θ = 13°) and γ2 peak (2θ = 22°) 61 in the XRD pattern of pristine nylon 6,6 nanofibers indicates that the nylon 6,6 nanofibers have a pure triclinic α phase comprising hydrogen-bonded sheets. 63 The XRD patterns of nylon 6,6 nanofibers obtained from FA and HFIP solvent systems were the same, indicating that α crystalline phase was obtained from both solvent systems.…”

mentioning

confidence: 99%

Polymer–Inorganic Core–Shell Nanofibers by Electrospinning and Atomic Layer Deposition: Flexible Nylon–ZnO Core–Shell Nanofiber Mats and Their Photocatalytic Activity

Kayacı

Özgit-Akgün

Dönmez

et al. 2012

ACS Appl. Mater. Interfaces

149

122

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Polymer−inorganic core−shell nanofibers were produced by two-step approach; electrospinning and atomic layer deposition (ALD). First, nylon 6,6 (polymeric core) nanofibers were obtained by electrospinning, and then zinc oxide (ZnO) (inorganic shell) with precise thickness control was deposited onto electrospun nylon 6,6 nanofibers using ALD technique. The bead-free and uniform nylon 6,6 nanofibers having different average fiber diameters (∼80, ∼240 and ∼650 nm) were achieved by using two different solvent systems and polymer concentrations. ZnO layer about 90 nm, having uniform thickness around the fiber structure, was successfully deposited onto the nylon 6,6 nanofibers. Because of the low deposition temperature utilized (200°C ), ALD process did not deform the polymeric fiber structure, and highly conformal ZnO layer with precise thickness and composition over a large scale were accomplished regardless of the differences in fiber diameters. ZnO shell layer was found to have a polycrystalline nature with hexagonal wurtzite structure. The core−shell nylon 6,6-ZnO nanofiber mats were flexible because of the polymeric core component. Photocatalytic activity of the core−shell nylon 6,6-ZnO nanofiber mats were tested by following the photocatalytic decomposition of rhodamine-B dye. The nylon 6,6-ZnO nanofiber mat, having thinner fiber diameter, has shown better photocatalytic efficiency due to higher surface area of this sample. These nylon 6,6-ZnO nanofiber mats have also shown structural stability and kept their photocatalytic activity for the second cycle test. Our findings suggest that core−shell nylon 6,6-ZnO nanofiber mat can be a very good candidate as a filter material for water purification and organic waste treatment because of their photocatalytic properties along with structural flexibility and stability. KEYWORDS: electrospinning, ALD (atomic layer deposition), nanofibers, ZnO, core−shell, photocatalytic activity, nylon ■ INTRODUCTIONOne-dimensional (1D) nanostructures such as nanofibers have distinctive properties that can offer good opportunities for developing advanced materials and devices.1−3 Among the other nanofiber fabrication methods, electrospinning has gained growing interest in the past decade because this technique is quite versatile and cost-effective for producing functional nanofibers from variety of materials including polymers, polymer blends, emulsions, suspensions, sol−gels, metal oxides, composite structures as well as nonpolymeric systems, etc. 2−8Electrospun nanofibers and their nanofiber mats have remarkable characteristics including a very high specific surface area, pore sizes within the nanoscale and very lightweight since the fiber diameter ranges from one micrometer down to a few tens of nanometers. Moreover, the control of the fiber surface morphology, fiber orientation, and cross-sectional configuration, and design flexibility for physical/chemical modification is quite feasible for obtaining multifunctional electrospun nanofibers. Because of their exceptional pr...

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Preparation and characterization of nano-hydroxyapatite/polyamide 66 composite GBR membrane with asymmetric porous structure

Cited by 52 publications

References 30 publications

The improvement of mechanical and thermal properties of polyamide 12 3D printed parts by fused deposition modelling

The improvement of mechanical and thermal properties of polyamide 12 3D printed parts by fused deposition modelling

Hybrid Membranes of Polyamide Applied in Treatment of Waste Water

Polymer–Inorganic Core–Shell Nanofibers by Electrospinning and Atomic Layer Deposition: Flexible Nylon–ZnO Core–Shell Nanofiber Mats and Their Photocatalytic Activity

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