Key Laboratory of Rubber Plastics

Key Laboratory of Rubber Plastics


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Wang Y.,Key Laboratory of Rubber Plastics | Wang Y.,Qingdao Technological University | Wang Y.,Qingdao University of Science and Technology | Jow J.,Dow Chemical Company | And 4 more authors.
Fire Safety Journal | Year: 2012

In this paper, an unsteady upward burning model for polymers under UL94 vertical test conditions was developed. With this model the simulated mass loss rate of polymethylmethacrylate agreed with experimental data to a certain extent initially, and was over-predicted later but still in the same magnitude as experimental data. It was found that the edge effect was important, and the calculated maximum local mass flux of volatiles increased dramatically at the ignition time to exceed the range of reported critical mass fluxes for ignition. Sensitivity analyses showed that the activation energy and the pre-exponential factor were two most important material parameters. Increasing the char yield shows a significant reduction in the peak mass loss rate (PMLR) but only a slight increase in the ignition time (t ig) and a slight reduction in the afterflame time (t af). Increasing the density or the heat capacity increases t ig and reduces both PMLR and t af. Increasing the thermal conductivity increases t ig and decreases t af but has very little effect on PMLR. Increasing the sample thickness reduces both PMLR and t af but affects t ig less significantly than material properties. Increasing the heat feedback increases both PMLR and t af but has very little effect on t ig. © 2012 Elsevier Ltd.


Wang B.,Key Laboratory of Rubber Plastics | Wang B.,Shandong Provincial Key Laboratory of Rubber Plastics | Gao X.,Key Laboratory of Rubber Plastics | Gao X.,Shandong Provincial Key Laboratory of Rubber Plastics | And 2 more authors.
Journal of Nanomaterials | Year: 2013

C60 fullerene nanofibers (FNFs) were for the first time prepared by a volatile diffusion method using toluene as solvent and isopropyl alcohol as precipitation agent in room temperature, 25°C. FNFs with different lengths, aspect ratios, and morphologies could be fabricated by changing incubation time. Meanwhile, as for a crystal growth process, a possible mechanism of the formation of the crystal of FNFs was proposed in which the short and thin FNFs are the result of crystal growth, and self-assembly happens between the short fibers and thus leads to the formation of thick and long bundles of the FNFs. © 2013 Bingzhe Wang et al.


Hu J.,Key Laboratory of Rubber Plastics | Sun P.,CAS Institute of Chemistry | Jiang X.,Key Laboratory of Rubber Plastics | Zhu W.,CAS Institute of Chemistry | Zhang K.,CAS Institute of Chemistry
Science China Chemistry | Year: 2016

In the present study, we synthesized well-defined tadpole-shaped polystyrene (PS) via the combination of atom transfer radical polymerization (ATRP) and UV-induced strain promoted azide-alkyne cycloaddtion (SPAAC) reaction. A di-bromo ATRP initiator (Br-ini-Br) containing cyclopropenone-masked dibenzocyclooctyne group was used to prepare the linear PS with a cyclopropenone-masked dibenzocyclooctyne in the middle of the chain and bromo groups at both ends (Br-PS-Br). Then we used the single electron transfer-nitroxide radical coupling (SET-NRC) reaction to transfer the bromo end groups to azide groups (N3-PS-N3). After UV irradiation, the dibenzocyclooctyne group was quantitatively released, and intramolecularly reacted with alternative azide end group to produce the tadpole-shaped PS based on SPAAC reaction. © 2016 Science China Press and Springer-Verlag Berlin Heidelberg


Yan Y.,Key Laboratory of Rubber plastics | Yan Y.,Qingdao University of Science and Technology | Yang S.,Qingdao University of Science and Technology | Cui J.,Key Laboratory of Rubber plastics | And 3 more authors.
Polymer International | Year: 2011

Pyrene-capped polystyrene (PyPS) with various molecular weights (M̄ n) was synthesized through the anionic polymerization method and characterized using UV, Fourier transform infrared and NMR spectroscopy and gel permeation chromatography. The polymers were then used for non-covalent functionalization of pristine single-walled carbon nanotubes (SWNTs). The functionalization efficiency was assessed by measuring the SWNT dispersibility in chloroform. In the presence of PyPS, the dispersibility can be as high as 372.5 mg L -1, and the dispersions containing more than 1.25 mg mL -1 of PyPS are very stable with no solid deposits observed after being centrifuged at 5000 rpm for 15 min. Once the PyPS concentration is converted to the molar concentration of the pyrene unit and the dispersibility redefined as nanotube content per molar pyrene unit, the renewed dispersibility is found to be independent of M̄ n of PyPS within the detected M̄ n range. For a certain PyPS polymer, however, both nanotube dispersibility and dispersion stability are strongly dependent on the PyPS concentration. These results suggest that PyPS may be used as an excellent dispersant for subsequent preparation of polystyrene/SWNT composites. © 2011 Society of Chemical Industry.


Wang Z.,Qingdao University of Science and Technology | Cheng X.,Qingdao University of Science and Technology | Zhao J.,Key Laboratory of Rubber Plastics
Materials Chemistry and Physics | Year: 2011

Thermoplastic vulcanizates (TPVs) based on polyethylene-octene elastomer (POE)/ethylene-propylene diene copolymer (EPDM) blends were prepared by dynamic vulcanization, the effects of the EPDM incorporation on mechanical, dynamic mechanical and morphological properties of the TPVs were investigated systemically. Experimental results indicate that compared with pure POE, the improvement of mechanical properties of POE/EPDM blends was achieved; the tensile strength and tearing strength reached the maximum at an EPDM content of 20 wt.%. It is interesting to note that the tensile set at break was decreased almost linearly with increasing EPDM loading, decreasing from 190% (at 0 phr EPDM) to 55% (at 30 wt.% EPDM), indicating the relatively large permanent deformation of POE is improved remarkably by the incorporation with EPDM. Phase contrast microscopy studies show that the vulcanized EPDM particles were uniformly dispersed in the POE matrix. RPA results show that the elastic modulus increased with increasing frequency, moreover, it is noteworthy that the storage modulus of dynamically vulcanized POE/EPDM blends was higher than that of pure POE, however, the storage modulus decreased with increasing EPDM content, the incorporation of EPDM had almost no influence on the tan δ. © 2010 Elsevier B.V. All rights reserved.


Wang Z.,Qingdao University of Science and Technology | Zhang Y.,Qingdao University of Science and Technology | Du F.,Qingdao University of Science and Technology | Wang X.,Key Laboratory of Rubber Plastics
Materials Chemistry and Physics | Year: 2012

Thermoplastic elastomer (TPE) based on high impact polystyrene (HIPS)/ethylene-vinyl acetate copolymer (EVA)/waste ground rubber tire (WGRT) powder composites were prepared by melt-compounding, and the composites were compatibilized by styrene-butadiene-styrene block copolymer (SBS). The effects of SBS compatibilizer on mechanical properties and morphological properties of the composites were investigated systemically. Experimental results indicate that SBS had a good compatibilization effect on the HIPS/EVA/WGRT composites. Compared with HIPS/EVA/WGRT composites, the tensile strength and the elongation at break went through maximum values at a compatibilizer resin content of 12 phr, which were improved by 145% and 1280%, respectively. Morphology study shows that the interface interaction was strong in the HIPS/EVA/WGRT composites compatibilized by SBS, which contributed to the significantly improved mechanical properties. Payne effect could be found in the strain sweep of HIPS/EVA/SBS/WGRT composites, which was related to the variation of interface interaction. The increasing dosage of SBS compatibilizer in the HIPS/EVA/WGRT composites weaken the Payne effect and led to the slow decrease of storage modulus. © 2012 Elsevier B.V. All rights reserved.


Wang Z.,Qingdao University of Science and Technology | Zhao H.,Qingdao University of Science and Technology | Zhao J.,Key Laboratory of Rubber Plastics | Wang X.,Key Laboratory of Rubber Plastics
Journal of Applied Polymer Science | Year: 2010

Thermoplastic vulcanizates (TPVs) based on high impact polystyrene (HIPS)/styrene-butadiene rubber (SBR) blends were prepared by dynamic vulcanization technique. The rheological, mechanical and morphological properties of the dynamically vulcanized blends were investigated systematically. As determined by capillary rheometer, the apparent viscosity of the blends decreases as the shear rate increases, indicating obvious pseudoplastic behavior. At low shear rate, the apparent viscosity of these blends is considerably higher than that of neat HIPS and decreases with the increase of HIPS concentration. The increase of HIPS content in the dynamically vulcanized blends contributes to the increase of tensile strength and hardness properties, while elongation at break and tensile set at break reach a maximum at 30 and 50 wt % of the HIPS content, respectively. The etched surfaces of the HIPS/SBR TPVs were investigated using field-emission scanning electron microscopy, the morphological study reveals continuous HIPS phase and finely dispersed SBR elastomeric phase in the TPVs. © 2010 Wiley Periodicals, Inc.


Wang Z.,Qingdao University of Science and Technology | Wang X.,Key Laboratory of Rubber Plastics
Journal of Thermoplastic Composite Materials | Year: 2011

Organically modified montmorillonite (OMMT) nanoparticles were obtained by hydrothermal reaction and then styrene-butadiene-styrene tri-block copolymer (SBS)/exfoliated montmorillonite nanocomposites were prepared by melt-compounding. The morphology of the OMMT nanoparticles was observed by field-emission scanning electron microscopy. The exfoliated OMMT nanoparticles consisted of several parallel MMT layers and presented disordered and floccule morphology. Mechanical tests showed that the tensile stress, elongation at break, and tearing strength were improved with increasing OMMT content, whereas the tensile strength at break slightly decreased. The relatively strong interface interaction between SBS and OMMT resulted in the improvement of the mechanical properties of SBS/OMMT nanocomposites. © The Author(s), 2011.


Wang Z.,Qingdao University of Science and Technology | Zhao H.,Qingdao University of Science and Technology | Zhao J.,Key Laboratory of Rubber Plastics | Wang X.,Key Laboratory of Rubber Plastics
Journal of Macromolecular Science, Part B: Physics | Year: 2011

Thermoplastic vulcanizates (TPVs) based on styrene-butadiene rubber (SBR)/ethylene-vinyl acetate copolymer (EVA)/high-impact polystyrene (HIPS) blends were prepared by dynamic vulcanization, and the TPVs was compatibilized by styrene-butadiene-styrene block copolymer (SBS). The effects of SBS compatibilizer on mechanical, dynamic mechanical, and morphological properties of the TPVs were investigated systemically. Experimental results indicate that SBS had a good compatibilization effect on the SBR/EVA/HIPS TPVs. The tensile strength went through a maximum value at a compatibilizer resin content of 6 phr, and the elongation at break and tear strength increased with increasing SBS content. Morphology study shows that the vulcanized SBR particles were dispersed in the HIPS matrices. A rubber process analyzer reveals that the elastic modulus increased with increasing frequency and the incorporation of EVA in the TPVs led to the obvious decrease of elastic modulus; however, the further addition of compatibilizer SBS affected the elastic modulus less. The tan decreased continuously with increasing frequency. The addition of SBS in the TPVs led to enhanced hysteresis behavior and relatively high tan. Copyright © Taylor & Francis Group, LLC.


Li G.,Key Laboratory of Rubber plastics | Liu P.,Key Laboratory of Rubber plastics | Han Z.,Key Laboratory of Rubber plastics | Piao G.,Key Laboratory of Rubber plastics | And 3 more authors.
Materials Letters | Year: 2010

A novel approach to rapid fabrication of fullerene C60 nanotubes (FNTs) has been developed using C60-pyridine colloid as a precursor. The colloid was prepared by exposing a C60-pyridine solution to visible light. Without irradiation of the visible light, growth of FNTs is not found in the freshly prepared C60-pyridine solution and the ultrasound-agitated solution. By contrast, the FNTs were easily grown in the C60-pyridine solution which was exposed to the visible light. The observation of the Tyndall effect indicated the formation of C60-pyridine colloid that is essential for synthesizing the FNTs with excellent reproducibility. The results showed that the wall of FNTs was a local face-centered cubic crystal arrangement. © 2009 Elsevier B.V. All rights reserved.

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