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Sun Y.,Taiyuan University of Technology | Han H.,Shanxi Provincial Institute of Chemical Industry | Liu L.,Shanxi Provincial Institute of Chemical Industry | Jia L.,Shanxi Provincial Institute of Chemical Industry
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2013

Organically modified attapulgite (OAT)/polyurethane nanocomposites were prepared by intercalative polymerization method. The surface structure of the organic modified attapulgite was characterized by FT-IR. The mechanical properties, heat resistance of nanocomposite and the dispersion state of nano particles in the composites were studied. The results reveal that when the mass fraction of organic modified attapulgite is 2%, the composites have the best comprehensive mechanical properties with the tensile strength about 55.91 MPa, the elongation at break about 559.45%, the 300% stretching strength about 31.69 MPa and the hardness almost unchanged, and the thermal stability is improved. The morphology of organic modified attapulgite is the most discrete in polyurethane matrix when the mass fraction of the modified attapulgite is below 2%, and the agglomeration of organic modified attapulgite appears with the increase of its content. Source

Zhang Z.,Research Center for Engineering Technology of Polymeric Composites | Zhang Z.,North University of China | Zhang H.,Research Center for Engineering Technology of Polymeric Composites | Zhang H.,North University of China | And 15 more authors.
Polymer Composites | Year: 2016

Elastomeric polyurethane (PU) was mixed with 0, 10, 15, 20, 25, and 30 wt% of graphite to obtain PUE-based composites. The structure of PU/graphite elastomer was characterized by scanning electron microscopy. It was found that the polyurethane elastomer (PUE) molecular chains were intercalated into the graphite layers and evenly distributed in the matrix. When the graphite content was lower it could make full use of its strength with some loss of plasticity; when the graphite content was too high, the friction between graphite and PUE increased and hence it is more difficult for the macromolecular chain reaction. The polymer was more unstable as a whole. Furthermore, the thermal and mechanical properties of the obtained products were investigated in detail. The result showed that the thermal stability of PUE was improved by the introduction of the graphite. The softening temperature of the PUE/graphite containing 10% graphite was 11°C higher than that of pure PUE. At the same time, the hardness, tensile strength, elongation, 300% tensile modulus, tearing strength of PU/graphite elastomer were also investigated. © 2014 Society of Plastics Engineers. Source

Dai J.-M.,Taiyuan University of Technology | Zhu Y.,Shanxi Provincial Institute of Chemical Industry
Wool Textile Journal | Year: 2011

The ultrafine wool was modified by Ag-loading nano-Si02 solution with ultraviolet light corroding and coupling agent KH-560 treating to get Ag-loading nano-Si02/ultrafine wool composite whose surface form an antibacterial layer. After testing the clothing properties of ultrafine wool and nanotreated ultrafine wool, the results showed that the major properties of modified ultrafine wool were improved, such as the fibers' surface became homogeneous, the length increased by 6. 18% , the fineness decreased by 4. 41% , the single fiber breaking strength increased by 22. 84% , the elastic reversion ratio increased by 7. 58% , the static frictional effectiveness decreased by 16. 25% and the antibacterial ratio against E. coli and S. aureus was above 96% . Discussing the influence of Ag-loading nano-Si02 on clothing properties of ultrafine wool, suggesting that the quality and mechanical function of ultrafine wool and its fabric were improved. Moreover, it was much more comfortable for clothing and the additional value was also raised greatly. Source

Shen Z.,Ningxia University | Luo F.,Ningxia University | Xing Q.,Beijing Technology and Business University | Si P.,Ningxia University | And 4 more authors.
CrystEngComm | Year: 2016

Poly(ethylene terephthalate) (PET) and aryl amide derivative (TMB-5) blends were prepared by melt blending. It was found that TMB-5 shows a significant nucleation effect on PET and especially the non-isothermal nucleation efficiency reached up to 80.7% at a very low content of 0.6 wt% TMB-5. The effects of TMB-5 on the crystallization behavior and mechanical properties of PET were systematically investigated. DSC results show that crystallization temperature of PET apparently increased by nearly 20 °C with the addition of 0.6 wt% TMB-5 during the cooling process. A remarkable acceleration in the crystallization rate of PET was achieved as analyzed using the Avrami equation. Wide angle X-ray diffraction (WAXD) and polarized optical microscopy (POM) results show that the addition of TMB-5 remarkably increases the crystallinity and nuclei density of PET. Small angle X-ray scattering (SAXS) measurements reveal that the long period of PET decreased and lamellar thickness increased with an increase in TMB-5 content. The impact strength of PET was greatly enhanced by the addition of TMB-5, and a toughening mechanism was proposed. © The Royal Society of Chemistry 2016. Source

Yu X.,Taiyuan University of Technology | Lv Z.,Taiyuan University of Technology | Tong Y.,Taiyuan University of Technology | Yang R.,Shanxi Provincial Institute of Chemical Industry
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2013

Polyurethanes(PUs) developed from polytetramethylene glycol (PTMG), toluene 2, 4-diisocyanate (TDI-100), 3, 5-dimethyl mercapto toluenediamine (E-300) and different inorganic particles were prepared by prepolymerization method. Dynamic mechanical analysis(DMA) was used to investigate the effects of inorganic particles on microphase separation and its relationship with mechanical properties. The results show that adding inorganic particles in PUs can enhance microphase separation and significantly improve tear resistance performances. Besides, among PU/SiO2, PU/CNTs and PU/zeolite molecular sieve 13X composites, carbon nanotubes(CNTs) represents the greatest effect on the microphase separation between hard and soft segments of PU. And the glass transition temperature (Tg) of soft segments (obtained from tanδ-T curve) in PU/CNTs composites decreases by 17.18°C compared to that of pure PU. Source

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