Shanghai Genius Advanced Materials Co.

Shanghai, China

Shanghai Genius Advanced Materials Co.

Shanghai, China
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Wu F.,Fujian University of Technology | Wu F.,CAS Institute of Chemistry | Yang G.,CAS Institute of Chemistry | Yang G.,Shanghai Genius Advanced Materials Company
Journal of Applied Polymer Science | Year: 2010

A novel cyclic initiator was synthesized from dibutyl tin(IV) oxide and hydroxyl-functionalized multiwalled carbon nanotubes (MWNTs) and was used to initiate the ring-opening polymerization of cyclic butylene terephthalate oligomers to prepare poly(butylene terephthalate) (PBT)/MWNT nanocomposites. The results of Fourier transform infrared and NMR spectroscopy confirmed that a graft structure of PBT on the MWNTs was formed during the in situ polymerization; this structure acted as an in situ compatibilizer in the nanocomposites. The PBT covalently attached to the MWNT surface enhanced the interface adhesion between the MWNTs and PBT matrix and, thus, improved the compatibility. The morphologies of the nanocomposites were observed by field emission scanning electron microscopy and transmission electron microscopy, which showed that the nanotubes were homogeneously dispersed in the PBT matrix when the MWNT content was lower than 0.75 wt %. Differential scanning calorimetry and thermogravimetric analysis were used to investigate the thermal properties of the nanocomposites. The results indicate that the MWNTs acted as nucleation sites in the matrix, and the efficiency of nucleation was closely related to the dispersion of the MWNTs in the matrix. Additionally, the thermal stability of PBT was improved by the addition of the MWNTs. © 2010 Wiley Periodicals, Inc.


Gong Y.,CAS Institute of Chemistry | Yang G.,Shanghai Genius Advanced Materials Co.
Journal of Applied Polymer Science | Year: 2010

Recycled polyamide 6 (PA6) cloth was used as the only raw material to prepare single polymer composites (SPC) by partially melting the PA6 fibers. During the process, part of PA6 fibers was melted to fill the gap between the remained fibers at a temperature in the melting temperature range of fibers. The matrix was in situ formed by recrystallization of the molten part and bonded the remained unmolten fibers together with cooling. Effects of a critical parameter, processing temperature (222-228°C), on the partially melting behavior of PA6 fibers and the properties of the resulting SPC were investigated by differential scanning calorimetry (DSC), scanning electron microscope (SEM), and tensile tests. As a result, at the processing temperature of 226°C, 31% of PA6 fibers were exactly molt to form the matrix and the tensile strength of prepared SPC achieved a maximal value of 138 MPa that was 105% higher than the one of neat PA6. © 2010 Wiley Periodicals, Inc.


Wu F.,CAS Institute of Chemistry | Wu F.,University of Chinese Academy of Sciences | Yang G.,Shanghai Genius Advanced Materials Co.
Polymers for Advanced Technologies | Year: 2011

Poly(butylene terephthalate) (PBT) had been covalently attached onto the surface of multiwalled carbon nanotubes (MWNTs) by a "grafting from" method based on in situ ring-opening polymerization (ROP) of cyclic butylene terephthalate oligomers (CBT) using MWNT-supported initiator (MWNT-g-Sn). The Sn-O bond grafted on the surface of MWNTs, which was confirmed by X-ray photoelectron spectroscopy, provided the initiating sites for ROP of CBT. Fourier transformed infrared spectroscopy and nuclear magnetic resonance were used to confirm the chemical structure of MWNT-graft-PBT copolymer and emission transmission electron microscope was utilized to observe the nanostructure of the PBT functionalized MWNTs. A distinct core-shell structure with PBT layer as the shell could be observed after functionalization of PBT despite it was not uniform. The results of thermogravimetric analysis indicated that the grafting ratio of PBT was about 59.3%. Furthermore, the solubility of the PBT functionalized MWNTs in phenol/tetrachloroethane had also been investigated. © 2010 John Wiley & Sons, Ltd.


Gong Y.,CAS Institute of Chemistry | Gong Y.,University of Chinese Academy of Sciences | Liu A.,Shanghai Genius Advanced Materials Co. | Yang G.,Shanghai Genius Advanced Materials Co.
Composites Part A: Applied Science and Manufacturing | Year: 2010

In order to prepare the polyamide single polymer composites (SPC PA) comprised of polyamide 6 (PA6) fiber and PA6 matrix, a novel method based on the in situ anionic polymerization of -caprolactam was developed. The influence of a critical process parameter, molding temperature, on the structure of SPC PA was investigated by thermogravimetric analysis (TGA) and scanning electron microscope (SEM). Mechanical properties of SPC PA prepared at 140, 160, 180, and 200 °C were appraised by three-point bending and tensile test. An optimum molding temperature (160 °C) at which both the tensile and flexural strength reached a peak value was found in the studied molding temperature range. High reaction degree (>93%), low void fraction (<2.5%) and strong and stable fiber/matrix interface contributed to the obvious reinforcing effect of PA6 fibers on PA6 matrix. © 2010 Elsevier Ltd. All rights reserved.


Yan D.,Jiangsu University of Science and Technology | Yang G.,Shanghai Genius Advanced Materials Co.
Journal of Applied Polymer Science | Year: 2012

In this article, polyamide 6/polystyrene/multiwalled carbon nanotubes (PA6/PS/MWNTs) nanocomposites were prepared via successive in-situ polymerization. The effect of MWNTs on the morphology and electrical properties of polyamide 6/polystyrene (PA6/PS) blends was investigated in detail. Scanning electron microscopy and transmission electron microscopy analysis indicated that MWNTs were selectively located at the interface of PA6 and PS. The interface-localized MWNTs could act as compatibilizers, which resulted in the decreased size of PS domains in PA6 matrix and the delayed phase inversion of immiscible PA6/PS blends. The PA6/PS interface was continuous in the MWNTs-filled (70/30) PA6/PS blends. Selectively located MWNTs at the continuous interface were connected with each other, which resulted in the establishment of a MWNTs conductive pathway in (70/30) PA6/PS blends. Electrical properties analysis indicated that the volume resistivity of (70/30) PA6/PS blends with 0.5 and 1.0 wt % MWNTs loading was decreased by about nine orders of magnitude. © 2011 Wiley Periodicals, Inc.


Gong Y.,CAS Institute of Chemistry | Yang G.,Shanghai Genius Advanced Materials Co.
Journal of Materials Science | Year: 2010

Resin transfer molding (RTM) was used to manufacture all-polyamide (all-PA) composites in which PA6 matrix was in situ formed by the anionic polymerization of ε-caprolactam (CL). Influence of molding temperature (T M), a critical process parameter, on the structure and properties of all-PA composites was investigated using TGA, DSC, SEM, and tensile, flexural test. Increasing T M resulted in the decrease of CL conversion and the enhancement of fiber/matrix interface bonding. By comparing the mechanical properties of all-PA composites prepared at different T M (140-200 °C), an optimal T M (180 °C) was found in this temperature range. As a whole, the complete consolidation of all-PA composites and the remarkable reinforcing effect of PA66 fibers on PA6 matrix were assured by low-void fraction, high-CL conversion and strong interface performance though in a wide T M range. © 2010 Springer Science+Business Media, LLC.


Xia H.,Zhejiang University | Zhao X.,Zhejiang University | Yang G.,Zhejiang University | Yang G.,Shanghai Genius Advanced Materials Co.
Materials Letters | Year: 2013

A double in situ approach was adopted to fabricate Fe3O 4/polyamide 6 magnetic nanocomposite by the combination of the formation of Fe3O4 NPs and the polymerization of ε-caprolactam in one-pot. The ε-caprolactam was not only used as a solvent for the synthesis of Fe3O4 NPs, but also served as monomer in anionic ring-opening polymerization. The properties of Fe 3O4/polyamide 6 nanocomposite were characterized by XRD, SEM, TEM, TGA and SQUID. The results indicated that the nanocomposite consisted of dispersed Fe3O4 NPs (ca. 15 nm) and polyamide 6, and it had superparamagnetic behavior with saturation magnetization of 1.7 emu/g. © 2013 Elsevier B.V.


Liu Y.,Zhejiang University | Yang G.,Zhejiang University | Yang G.,Shanghai Genius Advanced Materials Co.
Thermochimica Acta | Year: 2010

Polyamide-6 (PA6)/graphite oxide (GO) nanocomposite was synthesized using delamination/absorption with dimethylacetamide as solvent. TEM showed that graphite oxide sheets were completely exfoliated and distributed uniformly in polyamide-6 matrix. Non-isothermal crystallization behaviors of PA6 and nanocomposites were investigated using DSC. The modified Avrami, Mo and Ozawa equation were employed to investigate the crystallization process. The former two could successfully describe the non-isothermal crystallization of PA6 and nanocomposites. It was interesting to find that Ozawa equation could successfully describe the non-isothermal crystallization of nanocomposites, but it was not valid for PA6. The crystallization rate of nanocomposites greatly decreased by the addition of GO, which confirmed by the results of half-time of crystallization (t1/2), crystallization rate exponent Zc and log F(T). Also, the more the content of GO, the slower the crystallization rate. The effective activation energy calculated from Friedman formula suggested that the layered structure of GO restrained the crystallization of PA6. © 2010 Elsevier B.V. All rights reserved.


Xia H.,Zhejiang University | Yang G.,Zhejiang University | Yang G.,Shanghai Genius Advanced Materials Co.
RSC Advances | Year: 2013

Lactams have strong polarity, high boiling points, and strong coordination capacity. However they are yet to be well accepted as solvents for the synthesis of nanomaterials. This work aims at developing a facile and general lactam method to synthesize inorganic nanoparticles such as ZnO and Fe 3O4 using three homologous lactams, γ-butyrolactam (BL), δ-valerolactam (VL) and ε-caprolactam (CL), as solvents. The resulting nanoparticles (NPs) are uniform and spherical in shape and have good dispersion. The ZnO NPs synthesized in BL, VL and CL have average diameters of ca. 30.0, 7.3, and 8.5 nm, respectively. The average diameters of Fe 3O4 NPs synthesized in BL, VL and CL are ca. 6.3, 4.0 and 4.8 nm, respectively. Moreover, their dispersion tends to deteriorate with increasing number of methylene groups in the lactam. Some explanations for the influence of lactam on the morphology of the synthesized NPs are proposed. Optical properties of ZnO NPs are investigated and are correlated with their morphologies and surface states. 6-Aminohexanoic acid (AHA), a biocompatible amino acid, is used to displace lactam capped on the surfaces of ZnO NPs. This journal is © The Royal Society of Chemistry 2013.


Xia H.,Zhejiang University | Yang G.,Zhejiang University | Yang G.,Shanghai Genius Advanced Materials Co.
Journal of Materials Chemistry | Year: 2012

This work reports on a general route to synthesize inorganic nanoparticles. Using molten ε-caprolactam (CL, melting point = 69.2 °C) as a nonaqueous solvent and a stabilizer, various types of inorganic nanoparticles such as metal oxide, metal hydroxide and sulfide are readily synthesized via precipitation reactions of inexpensive precursors at about 100 °C for 2 h. These nanoparticles are relatively uniform in size and have relatively high crystallinity. Some of them such as ZnO and Fe 3O 4 have excellent optical and magnetic properties. Appropriate polarity, dielectric constant and coordinating effect are three key aspects for the formation of high-quality nanoparticles. The approach developed in this work would pave a new way for facile, low toxicity, solvent-recyclable and large-scale synthesis of inorganic nanoparticles with well-controlled dimensions and properties. © 2012 The Royal Society of Chemistry.

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