Progress in Polymer Processing

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Authors: Wei Min Yang
Abstract: In order to solve the bottleneck problem of polymer product processing striving for micro scale and precision or macro scale and complication in modern manufacturing, a concept of differential and integral method applied in advanced manufacture of polymer materials is brought up. On the base of this concept, principles of injection molding, extrusion, electrostatic spinning, nano-composite processing and structure innovation of polymer products have been studied; a series of new methods of polymer processing and molding, new equipments, and new technologies of product application have been invented. Some industrial application results prove that, the concept of differential and integral method applied in advanced manufacture of polymer materials is a valuable guide to break through the restriction of traditional manufacturing mode, and to develop new method of polymer processing and new technologies of polymer products application.
Authors: Lian Xiang Ma, Hai Quan Yan, Jia Na Ke, Yan He
Abstract: In this paper, the thermal conductivities and mechanical properties of natural rubber which is filled with graphite and modified by acrylate are studied experimentally. It is found that the thermal conductivities and mechanical properties of vulcanizates are improved significantly. The thermal conductivity and mechanical properties of graphite-filled nature rubber which is modified by the mass ratio of 5:1 between graphite and monomers are best in 3 kinds of formulations.
Authors: Chuan Sheng Wang, Wei Shuai Lv, Hui Guang Bian
Abstract: This paper mainly introduces two kinds of internal mixer rotor. The professional visco-elastic fluid software--Polyflow is used to obtain dynamic simulation analysis process of the two different types of meshing rotors. The transient flow field model’s simulation results of the two intermeshing rotors which have rotated for 180 seconds are used to analyze the performance of the two rotors. And these analyses can be theoretical references for optimal design of the rotor.
Authors: Xin De Tang, Jun Li, Ling Li, Hong Chen, Xiang Li Kong
Abstract: Nano calcium carbonate/polymer composite coatings were prepared and their anti-icing property was investigated. The anti-icing capability of the composites depends not only on their superhydrophobicity but also on the surface morphology. The result opens up possibilities for rational design of anti-icing coatings by tuning surface textures in multiple scales and provides a comprehensive framework for optimazing nanoparticle/polymer composite for a wide range of applications.
Authors: Wei He, G. H. Bao, T. J. Ge, A.S. Luyt, X. G. Jian
Abstract: Using a feed-forward artificial neural network (ANN), the tensile strength of a series of poly(phthalazinone ether sulfone ketone)(PPESK) blended with different contents of polyetheretherketone(PEEK), polysulfone(PSF), polyphenylene sulide (PPS) and reinforced with various amounts of whisker(TK) composites has been predicted based on a measured database. Compared with the experimental results, the maximum error obtained is not more than 0.8%. It is concluded that the predicted data are well acceptable. A well-trained ANN is expected to be very helpful mathematical tool in the structure-property analysis of polymer composites. Finally, using ANN modeling data and experimental data, the tensile strength properties related to whisker weight percent were established.
Authors: Feng Wen Zhao, Yong Liu, Yu Mei Ding, Hua Yan, Peng Cheng Xie, Wei Min Yang
Abstract: Melt electrospinning was used to produce PLA superfine fibers. The high spun temperature will lead to serious degradation of PLA. To alleviate the thermal decomposition and obtain superfine fibers at low temperature, sucrrose fatty acid esters (SE) was added to decrease the viscosity of PLA melt. The diameter of PLA including SE was 1.5μm while those of pure PLA was 6.4μm. At the same time, pure PLA melt cost a long time to flow out of cylinder. So SE increased the flowability of PLA melt, which ensured PLA fibers of small diameters were get at low temperature. Spinning load or melt velocity has a direct effect on the relative molecular mass of PLA fibers.
Authors: Guo Li Gong, Lin Jia, Hui Li
Abstract: Molecular imprinted polymers (MIPs) for antitumor drug Epothilone B have been synthesized with bulk polumerization in order to specifically extract this agent in the present study. MIP was prepared by thermal polymerisation using Epothilone B as template, methacrylic acid as functional monomer, ethylene glycol dimethacrylate (EGDMA) as cross-linking agent. The best synthesis progenic solvent was ultimately determined when the bonding property of the polymer was studied. The selectivity of imprinted polymer on Epothilone B was also studied. The equilibrium binding experiments showed that the binding site of MIPs was heterogeneous with one binding site. Equilibrium dissociation constant was 3.37 mg/ml, the maximum apparent adsorption was 335 mg/g.
Authors: Ben Chao Han, Chi Zhang, Xue Yao, Xue Gang Luo
Abstract: Dicarboxylic anhydride esterified Konjac glucomannan (DCKGM) was prepared to reduce the unusual water absorbency of native Konjac Glucomannan (KGM). The dependence of degree of substitution (DS) on the reaction conditions and influence of the DS on water absorbency were studied. The esterification was conducted using refluxing KGM in hot acetic acid which contains phthalic anhydride and pyridine catalyst. The chemical structure and characteristic of DCKGM were analyzed by GPC-MALLS and FI-IR. The results showed that the water absorbency for DCKGM is inversely proportional to DS increase. DCKGM may be a promising biomaterial in application of drug carrier, heavy metal ion adsorption and functional packing materials.
Authors: Ti Kun Shan, Chang Jin Li, Wei Min Yang, Shu Jiang Li
Abstract: FEM analysis of flow field in nano-laminated coextrusion die is introduced. Nano-laminated coextrusion die is a new type of laminated composite generator which is based on the principle of the melt calculus. The distributions of pressure field and velocity vectors are obtained and analyzed. The result using finite element simulation software Polyflow shows an improvement in structure of die as well as better quality for melt flow characteristics. The paper is helpful in design and optimization of coextrusion die and process.

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