Engineering Research Center for Polymer Processing Equipment

Beijing, China

Engineering Research Center for Polymer Processing Equipment

Beijing, China
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Huang Y.,Beijing University of Chemical Technology | He Y.,Beijing University of Chemical Technology | He Y.,Engineering Research Center for Polymer Processing Equipment | Ding W.,Dart Container | And 4 more authors.
RSC Advances | Year: 2017

In this work, a triangle arrayed triple-screw extruder (TTSE) was used to prepare in situ polypropylene/polyamide 6,6 (PP/PA66) microfibrillar composites (MFCs) by direct extrusion at a processing temperature between the melting points of the two phases. The dispersed phase, PA66 particles, deformed, merged and was stretched into fibrils under the alternating shearing and extensional flow field in the TTSE. The fibrillar morphology was controlled through adjusting the PA66 content and processing parameters (temperature and screw speed). Dynamic oscillatory shear rheological properties and extensional viscosity of PP/PA66 microfibrils with different aspect ratio were studied. The obtained results showed that the storage modulus and complex viscosity of PP/PA66 MFCs were improved with increasing fibrillar aspect ratio. Meanwhile, the loss tangent tan-δ value decreased and the radius of the Cole-Cole plot circle increased with an increase in fibrillar aspect ratio. The PP/PA66 MFCs exhibited a pseudo-solid or gel-like behavior. The gel point concentration, which was determined by the Winter-Chambon criterion, decreased with the increasing fibrillar aspect ratio due to the increased interfacial area and enhanced entangled network structure. Additionally, high-aspect-ratio PA66 fibrils have dramatically improved PP's melting temperature, crystallization kinetics, and mechanical properties. © 2017 The Royal Society of Chemistry.


Zheng X.-T.,Engineering Research Center for Polymer Processing Equipment | Wei H.-L.,Engineering Research Center for Polymer Processing Equipment | Wu D.-M.,Beijing University of Chemical Technology | Liu Y.,Beijing University of Chemical Technology | Song M.-X.,Beijing University of Chemical Technology
Medziagotyra | Year: 2014

Layered double hydrotalcides/polystyrene (LDHs/PS) nanocomposites were produced by an in-situ bubble stretching (ISBS) method and simple shear method; the effect of LHDs content on the dispersion and the mechanical properties of nanocomposites was studied. The field emission scanning electron microscopy (FE-SEM) images indicated that the ISBS method leads to a high degree of dispersion of LDHs nanoparticles in PS matrix. Furthermore, it did not form a significant re-aggregation after defoaming by means of twin-screw extruder. Compared with the simple shear method, the un-notched impact strength and tensile strength of nanocomposites prepared by ISBS method were higher at the same amount of LDHs. The un-notched impact strength of the nanocomposites prepared by ISBS method reached a maximum value at the LDHs mass fraction of 5 % , the strength increased is 57.29 % greater than that of pure PS. The enhanced mechanical properties attributed to the effective dispersion of nanoscale LDHs by ISBS method. © 2014, Kauno Technologijos Universitetas. All rights reserved.


Li S.B.,Engineering Research Center for Polymer Processing Equipment | Wu D.M.,Engineering Research Center for Polymer Processing Equipment | Zheng X.T.,Engineering Research Center for Polymer Processing Equipment | Liu Y.,Beijing University of Chemical Technology | Gao X.L.,Beijing University of Chemical Technology
Advanced Materials Research | Year: 2013

It can increase the utilization rate of light energy and improve the reflection properties of materials by adding order of micro lens array on the material surface microstructure. The models to predict the change of material reflection properties with microstructure radius, height and arrangement was been established based on the optical design software Light Tools. By adding high refractive index TiO2 into the diffuse material with microstructure, the reflection properties of materials can been improved again. The results of the diffuse material molding test showed that the microstructure and its composite material had good reflection performance, reflection and diffuse reflection ratio could reach 93% and 93%, and the illumination uniformity could reach 63%. © (2013) Trans Tech Publications, Switzerland.


Wu D.,Beijing University of Chemical Technology | Huang Y.,Engineering Research Center for Polymer Processing Equipment | Meng Q.,Beijing University of Chemical Technology
Chemical Physics Letters | Year: 2013

To prepare gradient soft matter possessing usable properties, the key is to increase the difference in the forces that the particles or molecules experience in the two phases. In this article, experimental methods for the preparation of gradient polymer samples in artificial environments and the characterization of the sample properties are reported. The results show that gradient polymer samples can be prepared in artificial environments, and XRD data shows the molecules of the polymer arranged along the electromagnetic field. Micrographs of the samples show that the environment has a large influence on the polymerization of the sample. © 2013 Elsevier B.V.


Zheng X.,Engineering Research Center for Polymer Processing Equipment | Wang H.,Beijing University of Chemical Technology | Liu Y.,Engineering Research Center for Polymer Processing Equipment | Wu D.,Engineering Research Center for Polymer Processing Equipment | And 2 more authors.
Key Engineering Materials | Year: 2013

In order to analyze the influence of scattering particles on the optical properties of light scatter of polymer diffusion plate, we establish the microspheres of scattering particles in mathematical physics model. According to Mie scattering theory, we study the relationship between the scattering intensity distribution and the particle radius, the refractive index and the wavelength of the incident light. The results show that the particle radius is larger and incident wavelength is smaller, scattering intensity distribution is concentrated; the particle refractive index and scattering intensity distribution are not a simple corresponding relationship. At the same time according to the Monte Carlo method, the simulation is also used to analysis the effect that scattering particle concentration, the scattering particle radius and refractive index influence the diffusion plate light transmission rate and uniformity. The result shows that as the particle concentration is greater and transmittance is smaller, uniformity increases first and then decreases. As the particle radius is small, light transmission rate is higher and the particle refractive index is larger, light transmittance increases first and then decreases. But the relationship of the uniformity, the particle radius and the particle refractive index are all not simple corresponding law. © 2013 Trans Tech Publications Ltd, Switzerland.


Luo Y.,Beijing University of Chemical Technology | Xin C.,Beijing University of Chemical Technology | Xin C.,Engineering Research Center for Polymer Processing Equipment | Yang Z.,Beijing University of Chemical Technology | And 5 more authors.
Journal of Applied Polymer Science | Year: 2015

In this article, the foaming behavior of isotactic polypropylene (iPP) and its composites with spherical or fibrous poly(bu-tylenes terephthalate) (PBT) using supercritical CO2 as a blowing agent were investigated. Their foaming performances were also compared in relation to the crystal morphology and rheological behavior of PP. Results demonstrate that crystal structures significantly impacted the cell structures of foams. At relatively low temperature, microcells appeared at the centers of PP spherulites where the melting started. Particularly, bi-modal cell structure formed in the foamed PP with increasing temperature. However, in the foamed PP composites with spherical or fibrous PBT, this structure almost disappeared due to the smaller PP spherulites. In foaming PP/PBT composites, the heterogeneous nucleation of spherical or fibrous PBT was effective at reducing cell size as well as improving cell density and cell uniformity. The fibrous PBT also acted as scaffolds for preserving cell shapes. © 2014 Wiley Periodicals, Inc.


Huang Y.,Engineering Research Center for Polymer Processing Equipment | Wu D.,State Key Laboratory of Organic Inorganic Composites | Ren D.,Engineering Research Center for Polymer Processing Equipment | Meng Q.,Beijing University of Chemical Technology | Di X.,Texas Tech University
Advances in Materials Science and Engineering | Year: 2015

Light scattering material with gradient refractive index was prepared under the electrical field by taking methyl methacrylate (MMA) monomer as the matrix with the addition of a little preheated styrene (ST) and peroxidation benzoin formyl (BPO). The material obtained under electrical field presented different transmittance and molecular weight at different parts of the cylindrical sample along the axis of the direction of electric field which led to the layering phenomenon and gradient refractive index. The disparity of molecular weight between different layers can be as much as 230 thousand. There were several peaks in the figure of GPC test of the sample under electric field. This proved that there were polymers with different molecular weights in the sample. Therefore, it can be concluded that electrical field has a significant effect on polymerization. © 2015 Yao Huang et al.


Zhang X.,Engineering Research Center for Polymer Processing Equipment | Wu D.M.,Beijing University of Chemical Technology | Liu Y.,Beijing University of Chemical Technology | Song G.J.,Engineering Research Center for Polymer Processing Equipment
Applied Mechanics and Materials | Year: 2013

Due to the biaxial oriented PVC (PVC-O) pipes have a great improvement in the strength, heat resistance, modulus, and impact resistance, etc. So the new products can be used in many situations. Referring to the foreign Mouth die drawing method, the mechanism of quasi-dynamic expansion method is proposed in the paper. We chose the hard polyvinyl chloride (PVC-U) pipes for raw materials, through the forward movement of the pipe match with the vertical reciprocating movement of the expansion parts, improve the design of a whole package of biaxial oriented self-reinforced pipe continuous production device. The device has great advanced properties: small expansion friction resistance, high hoop extension ratio, simple production device, production line is easy to start etc. © (2013) Trans Tech Publications, Switzerland.


Li S.B.,Engineering Research Center for Polymer Processing Equipment | Wu D.M.,Engineering Research Center for Polymer Processing Equipment | Zheng X.T.,Engineering Research Center for Polymer Processing Equipment | Liu Y.,Beijing University of Chemical Technology
Applied Mechanics and Materials | Year: 2013

The reflective properties and illumination uniformity of the polymer can be improved effectively with microstructure on the surface and scattering particles with high refractive index inside. The paper is based on the early research of the author. The reflector cup is processed by injection molding using the polymer of high reflective properties, which can achieve high efficiency of the light energy utilization and the uniform emergent ray. © (2013) Trans Tech Publications, Switzerland.


Wang H.J.,Engineering Research Center for Polymer Processing Equipment | Wu D.M.,Beijing University of Chemical Technology | Zheng X.T.,Engineering Research Center for Polymer Processing Equipment | Liu Y.,Engineering Research Center for Polymer Processing Equipment | Jing P.S.,Engineering Research Center for Polymer Processing Equipment
Applied Mechanics and Materials | Year: 2013

The article introduces a kind of preparation process of the micro structure diffuse reflection plate based on continuous extrusion and proposes a new preparation process of diffuse reflection plate. The process mainly includes two single screw extruders which work by means of co-extrusion composite. Then polymer sheet is got through the roller via the thermal printing. At last the micro structure is pressed on the polymer sheet. The preparation of diffuse reflection plate is successful. We can measure the surface microstructure of diffuse reflection plate by using ContourGT-X3 that is made from Germany. The content of the measuring includes the 3 d shape, depth, diameter and uniformity of the micro structure. The article analyzes that the die temperature, rolling depression and roll speed have the influence on the diffuse reflection plate replication rate. The experimental result shows that the die temperature has little impact on the replication rate; Along with the increase of roller press, diffuse reflection plate replication rate increases; Along with the increase of the roller speed, diffuse reflection plate replication rate reduces. © (2013) Trans Tech Publications, Switzerland.

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