Chengdu Institute of Product Quality Supervision and Inspection

Chengdu, China

Chengdu Institute of Product Quality Supervision and Inspection

Chengdu, China
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Hamdi M.,Texas A&M University | Zhang X.,Chengdu Institute of Product Quality Supervision and Inspection | Sue H.-J.,Texas A&M University
Wear | Year: 2017

In this study, we present an experimental and numerical investigation on scratch behavior on model polymeric films and laminates. The studied model systems consist of polyamide 6 (PA) and polypropylene (PP) films, and PA/PP and PP/PA laminates. Experimental findings, conducted according to ASTM/ISO standard, demonstrate that PP/PA laminate has better scratch performance than PA/PP. This is explained by low surface friction, characteristic constitutive behavior, and graded structure of PP/PA laminate. The scratch test was numerically simulated using a sophisticated FEM model to gain more mechanistic insight. The scratch features observed experimentally were well-captured using the FEM model, demonstrating the consistency between the experimental and numerical analyses. Low PA/PP scratch resistance is associated with high stress concentration at the laminate-substrate interface, leading to significant interfacial failure. Similarly, good PP/PA resistance is related to suppressed interfacial stresses due to effective dissipation of scratch energy by upper PP layer and the shielding of delamination from the substrate by the lower strong and stiff PA layer. This study provides guidelines for the design of scratch-resistant polymeric films and laminates. © 2017 Elsevier B.V.


Zhou L.-C.,Sichuan University | Zhou L.-C.,Chengdu Institute of Product Quality Supervision and Inspection | Meng X.-G.,Sichuan University | Fu J.-W.,Chengdu Institute of Product Quality Supervision and Inspection | And 3 more authors.
Applied Surface Science | Year: 2014

A novel chemically modified chitosan CS-SA-CD with phenol and β-cyclodextrin groups was prepared. The adsorptions of phenol, 2-chlorophenol (2-CP), 4-chlorophenol (4-CP), 2,4-dichlorophenol (DCP) and 2,4,6-trichlorophenol (TCP) on the functional chitosan from aqueous solution were investigated. CS-SA-CD exhibited excellent adsorption ability for chlorophenols especially for DCP and TCP. The maximum adsorption capacities of phenol, 2-CP, 4-CP, DCP and TCP on CS-SA-CD were 59.74, 70.52, 96.43, 315.46 and 375.94 mg/g, respectively. The scanning electron microscope and Brunauer-Emmett-Teller analyses revealed that the introduction of phenol group changed the surface morphology and surface properties of chitosan. The modified chitosan CS-SA-CD possesses larger surface areas (4.72 m2/g), pore volume (7.29 × 10-3 mL/g) and average pore diameter (59.99 Å) as compared to those of chitosan 3.27 m2/g, 2.00 × 10-3 mL/g and 15.95 Å, respectively. The enhanced adsorption of chlorophenols was also attributed to the interaction of hydrogen bond between Cl atom and OH group. The adsorption of chlorophenols on CS-SA-CD followed the pseudo-second-order kinetic model. Adsorbent could be regenerated easily and the regenerated CS-SA-CD remained 80-91% adsorption efficiency. © 2013 Elsevier B.V.


Wen X.,University of Sichuan | Li Y.,University of Sichuan | Nie M.,University of Sichuan | Wang Q.,University of Sichuan | Zhang X.,Chengdu Institute of Product Quality Supervision and Inspection
Polymer - Plastics Technology and Engineering | Year: 2016

ABSTRACT: This paper presented a simple and facile method to prepare high-performance polypropylene sheet through hybrid shish kebab crystals. The experimental results showed that fibrous rare earth nucleating agent (WBG) was a kind of rigid particle with properties of easier alignment along flow and more stability when compared with oriented molecule, so during the processing of WBG-modified polypropylene samples, WBG fibrils acted as “shish” to direct the oriented crystallization of coiled polymer chains perpendicular to the fibril, into hybrid shish kebab with reinforcement function. As a result, the tensile and yield strengths of WBG-modified polypropylene sheets were improved significantly. © 2016, Copyright © Taylor & Francis Group, LLC.


Zhao T.-B.,University of Sichuan | Zhang X.-F.,University of Sichuan | Zhang X.-F.,Chengdu Institute of Product Quality Supervision and Inspection | Wu H.,University of Sichuan | Guo S.-Y.,University of Sichuan
Chinese Journal of Inorganic Chemistry | Year: 2014

The influence factors of 2-hydroxy-4-methoxy benzophenone-5-sulfonic acid (BP)-intercalated MgAl layered double hydroxides (MgAl-LDHs) reaction such as interlayer anionS’ solvent’ pH, values and reaction time, were investigated. The MgAl-BP-LDHs was prepared through anion-exchange under the optimal condition and characterized further by laser particle-size analysis, thermo-gravimetric analysis and ultraviolet-visible analysis, respectively. The XRD, results indicate that the optimal reaction condition for the BP-intercalated MgAl-LDHs (MgAl-BP-LDHs) with high intercalation rate is 48 h in deionized water with pH, value of 7. The results show that particle size distribution of the MgAl-BP-LDHs is narrower than that of MgAl-LDHs. The thermal stability of the MgAl-BP-LDHs is improved due to strong supramolecular interactions between MgAl-LDHs layers and BP, anions. Compared with MgAl-LDHs and BP, the ultraviolet absorption range and ability of the MgAl-BP-LDHs are increased greatly due to the synergistic effect. © 2014, Chinese Chemical Society. All rights reserved.


Li Y.,University of Sichuan | Lin Y.,University of Sichuan | Nie M.,University of Sichuan | Wang Q.,University of Sichuan | Zhang X.,Chengdu Institute of Product Quality Supervision and Inspection
Journal of Macromolecular Science, Part B: Physics | Year: 2016

Polypropylene (PP)glass fiber (GF) composites modified by maleic anhydride-grafted polypropylene (MAH-g-PP) were prepared and the thermal influence on the interfacial properties was characterized and discussed. The results showed that the migration of MAH-g-PP from the PP matrix onto the GF surface was a thermally activated process. To be more specific, with the increasing processing temperature, more MAH-g-PP migrated onto the interface region to bridge PP matrix and GF together and promote the interfacial interaction, resulting in more efficient applied load transfer to GF through the interface. Accordingly, the mechanical properties of PPGF composites were improved with increasing processing temperature. Moreover, based on the content of MAH-g-PP on the surface of the GF and the mobility of MAH-g-PP in the PPGF composites, a temperature-dependent mechanism for the enhanced interface was proposed. We suggest this study not only provides a guide to adjust processing parameters to prepare high-performance PPGF composite, but also would be applicable for other immiscible systems. © 2016 Taylor & Francis Group, LLC.


Zhang X.,University of Sichuan | Zhang X.,Chengdu Institute of Product Quality Supervision and Inspection | Pi H.,University of Sichuan | Guo S.,University of Sichuan
Journal of Applied Polymer Science | Year: 2011

The UV irradiation aging behaviors of PVC composites with several inorganic fillers were studied through Fourier transform spectroscopy (FTIR), ultraviolet spectroscopy (UV-Vis), differential scanning calorimeter (DSC), scanning electron microscopy (SEM), and mechanical property test. It was found that incorporation of a small amount of the inorganic fillers such as CaCO 3, talc and SiO 2 could hold up the UV aging behaviors of PVC. Those filler-filled PVC composites sheets after 20 days UV irradiation maintain lower carbonyl index (CI) and good appearance of surfaces, as compared with the corresponding neat PVC sheets, ascribed to high reflection of those fillers to UV light. While montmorillonite (MMT) and pyrophyllite fillers could accelerate the UV aging behaviors of PVC, which could be concluded from both the sharp increase of the CI and lower T g due to the chain scission reactions because of their high absorbance of these fillers to UV light in 290-400 nm. In these two PVC composites, UV irradiation caused the deterioration of their mechanical properties and the appearance of rough, cracked and chalked surfaces after 20 days UV irradiation. Copyright © 2010 Wiley Periodicals, Inc.


Zhang X.,University of Sichuan | Zhang X.,Chengdu Institute of Product Quality Supervision and Inspection | Pi H.,University of Sichuan | Guo S.,University of Sichuan
Polymer Engineering and Science | Year: 2013

The photostabilizing efficiency of different light stabilizers in poly(vinyl chloride) (PVC) was investigated by discoloration, ultraviolet (UV) reflection experiment, Fourier transform infrared spectrum (FTIR), and scanning electron microscopy (SEM). The results show that the addition of light stabilizers can slow down discoloration of PVC. The UV reflection results verify that this change is due to the distribution of light stabilizers on irradiated surfaces, which can absorb (such as organic stabilizers) or reflect (such as titanium dioxide) UV light differently. The order of stabilizers that can slower the extent of discoloration is titanium dioxide (TiO2) > Tinuvin 234 (U4) > XT 833 (H2), U4 > Tinuvin 531 (U3) > Chimassorb 944 (H1), phenyl salicylate (U1). FTIR results show that the carbonyl group of pure PVC, TiO2, and H1-doped PVC increases significantly, indicating that the photo-oxidation reactions of these irradiated samples are relatively serious. The SEM results show that the surface damages of PVC doped with U2, U4, and H2 are somehow slighter, with only small holes or cavities on the surface, whereas the surfaces of pure PVC and H1-doped PVC are full of big and deep holes and some holes or cavities of 10 μm are detected. Copyright © 2012 Society of Plastics Engineers.


Zhang X.,University of Sichuan | Zhang X.,Chengdu Institute of Product Quality Supervision and Inspection | Zhao T.,University of Sichuan | Pi H.,University of Sichuan | Guo S.,University of Sichuan
Journal of Applied Polymer Science | Year: 2012

The Mg-Al oxide precursor prepared by the calcination of Mg-Al-carbonated layered double hydroxide (LDH) at 500 K for 4 h is used as the host material, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid (BP) is used as the guest material, BP-intercalated LDH (LDH-BP) is prepared by ion-exchange method. The structure of LDH-BP is characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and thermogravimetry and differential thermal analysis (TG-DTA). The thermal stability of PVC/BP, PVC/LDH, PVC/LDH-BP composites, as well as pure PVC is investigated by conventional Congo Red test and dynamic thermal stability analysis in both the open and closed processing environments. According to XRD and FTIR, BP anions have been intercalated into interlayer galleries of LDH. TG-DTA results show that the layer-anionic interaction results in the improvement of the thermal stability of BP. Congo Red tests indicate that the addition of BP catalyzes the thermal degradation of PVC. A little amount of LDH (such as 1 phr) makes PVC more stable, but excessive addition accelerates the thermal degradation of PVC. The addition of LDH-BP markedly improves the static thermal stability of PVC. The results of dynamic thermal stability tests in both the open and closed processing environments are consistent with that of Congo Red tests. Copyright © 2011 Wiley Periodicals, Inc.


Zhang X.,Chengdu Institute of Product Quality Supervision and Inspection | Pi H.,University of Sichuan | Guo S.,University of Sichuan | Fu J.,Chengdu Institute of Product Quality Supervision and Inspection
Plastics, Rubber and Composites | Year: 2016

The effects of ultraviolet absorbers (UVAs) on the UV-irradiation behaviours of rigid PVC were studied through Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy. In addition, the absorption behaviours of these UVAs in non-polar and polar solvents were characterised and the solution photolysis experiments of these UVAs in ethanol were investigated in the absence and presence of a free radical initiator during the UV irradiation. The results showed that the protection efficiency to photo-degradation of PVC was in the following order: 2,4,6-tri(2-hydroxy-4-butoxylphenyl)-1,3,5-triazine (U3) > 2-(2H-benzotriazol-2-yl)-6-dodecyl-4-methyl phenol (U2) > 2-hydroxy-4-n-octoxy-benzophenone (U1). This protection efficiency was related to the chemical structures of the UVAs, especially the intermolecular hydrogen bond (IMHB). In a polar solution, such as dimethyl sulfoxide, the absorption corresponding to the IMHB of U3 was intact, while that of U1 disappeared. The free radical initiator weakened the intensity of the absorption, accelerating the destruction of the IMHB. © 2016 Institute of Materials, Minerals and Mining.


Zhang X.,Chengdu Institute of Product Quality Supervision and Inspection | Zhou L.,Chengdu Institute of Product Quality Supervision and Inspection | Pi H.,University of Sichuan | Guo S.,University of Sichuan | Fu J.,Chengdu Institute of Product Quality Supervision and Inspection
Polymer Degradation and Stability | Year: 2014

2-hydroxy-4-methoxybenzophenone-5-sulfonic acid (BP) anion-intercalated Mg-Al-carbonated layered double hydroxide (LDH) (LDH-BP) was prepared by an ion-exchange method. The structure of LDH-BP was characterized by XRD, FTIR and TG-DTA. The accelerated weathering and thermal stability of PVC/LDH-BP composites were investigated by color change, oxidation products, surface morphology, and thermal stability time. In addition to the sacrificing role of BP anion structure by absorbing the incident light and transmitting the rest of the light in a non-harmful form, the ability of LDH-BP to scatter the incident light and to absorb the released HCl improves the resistance to both accelerated weathering and thermal degradation. © 2014 Elsevier Ltd. All rights reserved.

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