Key Laboratory on Preparation and Processing of Novel Polymer Materials of Beijing

Beijing, China

Key Laboratory on Preparation and Processing of Novel Polymer Materials of Beijing

Beijing, China

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Ma L.,Beijing University of Chemical Technology | Geng H.,Beijing University of Chemical Technology | Song J.,Beijing University of Chemical Technology | Li J.,Key Laboratory on Preparation and Processing of Novel Polymer Materials of Beijing | And 3 more authors.
Journal of Physical Chemistry B | Year: 2011

Responsive polymeric micelles have been widely studied because of their potential use in nanocontainers and nanocarriers. In this study, polyhedral oligomeric silsesquioxane (POSS) end-capped poly[2-(dimethylamino)ethyl methacrylate] (POSS-PDMAEMA), a stimuli-responsive organic-inorganic hybrid polymer, was synthesized via atom transfer radical polymerization (ATRP) using POSS-Br as a macroinitiator. The self-assembly behaviors of POSS-PDMAEMA in aqueous solution were studied by fluorescence probe, transmission electron microscopy (TEM), dynamic light scattering (DLS), high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD). The results revealed two self-assembly processes of POSS-PDMAEMA. First they self-assembled into a single micelle with the POSS molecules forming a crystal core and the PDMAEMA chains stretching as a corona. Then the single micelles, as building blocks, were able to reversibly form a hierarchical micelle-on-micelle structure (complex micelle) under external stimuli. © 2011 American Chemical Society.


Song J.,Beijing University of Chemical Technology | Song J.,Key Laboratory on Preparation and Processing of Novel Polymer Materials of Beijing | Chen G.,Beijing University of Chemical Technology | Chen G.,Key Laboratory on Preparation and Processing of Novel Polymer Materials of Beijing | And 7 more authors.
Polymers for Advanced Technologies | Year: 2011

Linear isocyanate-terminated poly(urethane-imide) (PUI) with combination of the advantages of polyurethane and polyimide was directly synthesized by the reaction between polyurethane prepolymer and pyromellitic dianhydride (PMDA). Then octaaminophenyl polyhedral oligomeric silsesquioxane (OapPOSS) and PUI were incorporated into the epoxy resin (EP) to prepare a series of EP/PUI/POSS organic-inorganic nanocomposites for the purpose of simultaneously improving the heat resistance and toughness of the epoxy resin. Their thermal degradation behavior, dynamic mechanical properties, and morphology were studied with thermal gravimetric analysis (TGA), dynamic mechanical analysis (DMA), and transmission electron microscope (TEM). The results showed that the thermal stability and mechanical modulus was greatly improved with the addition of PUI and POSS. Moreover, the EP/PUI/POSS nanocomposites had lower glass transition temperatures. The TEM results revealed that POSS molecules could self assemble into strip domain which could switch to uniform dispersion with increasing the content of POSS. All the results could be ascribed to synergistic effect of PUI and POSS on the epoxy resin matrix. © 2010 John Wiley & Sons, Ltd.


Ding Y.,Key Laboratory on Preparation and Processing of Novel Polymer Materials of Beijing | Ding Y.,Beijing University of Chemical Technology | Chen G.,Key Laboratory on Preparation and Processing of Novel Polymer Materials of Beijing | Chen G.,Beijing University of Chemical Technology | And 9 more authors.
Journal of Applied Polymer Science | Year: 2012

In this study, supertoughened polyamide (PA) nanocomposites were prepared by the incorporation of epoxidized polyhedral oligomeric silsesquioxane (POSS) into the polyamide 6 (PA6)/methyl methacrylate-butadiene-styrene copolymer (MBS) blend via a melt-blending method. The effect of POSS on the rheological properties, mechanical properties, water uptake, and morphology of the hybrid PA6 nanocomposites was studied. The results show that under impact loading, the hybrid PA6 composites exhibited significant improvements in both the crack initiation energy and the crack propagation energy. This hybrid composite showed supertough behavior. Meanwhile, the tensile strength and the water absorption resistance was also improved with the addition of epoxidized POSS. The capillary and torque rheological results indicated that the epoxidized POSS, which acted as nanoscale ball bearings, significantly decreased the melt viscosity of the matrices and facilitated the melting process. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were performed to study the microstructure-property relationships of the hybrid PA6 composites. The TEM results showed that the MBS particles were dispersed homogeneously in the PA6 matrix. The mean diameter of the MBS particles decreased, and the size distribution of the MBS particles narrowed down with the introduction of the epoxidized POSS and compatiblizer. The SEM micrographs indicated that the impact fracture surfaces of the PA composites showed morphological characteristics of supertough polymers because of the synergistic effect of the functionalized POSS and compatibilized MBS particles. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 Copyright © 2012 Wiley Periodicals, Inc.


Song J.,Beijing University of Chemical Technology | Song J.,Key Laboratory on Preparation and Processing of Novel Polymer Materials of Beijing | Wu G.,Beijing University of Chemical Technology | Wu G.,Key Laboratory on Preparation and Processing of Novel Polymer Materials of Beijing | And 7 more authors.
Macromolecular Research | Year: 2010

Incorporating elastic polyurethane in epoxy resin (EP) can enhance the physico-chemical properties but deteriorate the thermal stability. Poly(urethane-imide) (PUI) with a high reactive function group (-NCO), which combines the advantages of polyurethane and polyimide, was synthesized to simultaneously improve the toughness and thermal stability of epoxy resin. EP/PUI composites were prepared based on epoxy resin and poly(urethaneimide) with 4,4-diaminodiphenylmethane as the curing agent using a simultaneous polymerization method. FTIR analysis confirmed the formation of EP-g-PUI interpenetrating polymer networks via a reaction between -NCO of poly(urethane-imide) and -OH of epoxy resin. The thermal stability and mechanical properties were examined by thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and stress-tensile method, respectively. Corresponding to the pure epoxy resin, which has three stage thermal decomposition, the resulting PUI/EP composite exhibits only one stage and has a much higher initial decomposition temperature (323.8°C) than that (189.8°C) of the epoxy resin. Moreover, the EP/PUI composite has a higher glass transition temperature, tensile strength and breaking elongation when 30 phr PUI was added. With increasing PUI content to 70 phr, the breaking elongation was 213 times higher than that of the neat epoxy resin. The morphology of these composites was also investigated further by scanning electronic microscopy (SEM) and transmission electron microscopy (TEM). The results showed that a grafted interpenetrating polymer network was formed. [Figure not available: see fulltext.] © 2010 The Polymer Society of Korea and Springer Netherlands.

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