Papers by Author: Jian Wu Lan

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Authors: Rong Hui Guo, Wan Qi Yan, Jian Wu Lan
Abstract: Polyester fabric was pretreated with 3-aminopropyltrimethoxysilane (APTMS) through supercritical carbon dioxide (scCO2) process before electroless copper plating. APTMS pretreated polyester fibers were characterized by contact angle. Deposit weight, surface morphology and electromagnetic interference (EMI) shielding effectiveness (SE) of electroless copper plated polyester fabrics were investigated. The results show that polyester fibers are covered with APTMS after APTMS modification in scCO2 medium. Copper coatings on the polyester fibers are uniform after copper plating. Electromagnetic interference shielding effectiveness of the copper plated polyester fabric arrives at 60-80dB at frequencies ranging from 2 to 18 GHz.
Authors: Si Die Wu, Jian Wu Lan, Shao Jian Lin, Si Chen
Abstract: To improve the elastic recovery of common poly(ester-ether) fibers, especially under lower temperatures, an imide dicarboxylic acid was prepared with trimellitic anhydride and aminobenzoic acid firstly, and then series of poly(ester-ether-imide) block copolymer(CPI) were prepared with this imide dicarboxylic acid, terephthalic acid, 1,4-butanediol and polytetrahydrofuran glycol .etc. The stuctures and properties were investigated by FT-IR spectra, differential scanning calorimetry(DSC) and capillary Ubbelohde. It was found that the Tm of the polymer was about 140°C and the intrinsic viscosity was 0.7~0.9dL/g. The CPI copolymers were melting spinning. The draw ratio and test temperature effects to the fibers' elastic recovery were studied. The results showed that stretching is beneficial to the improvement of the elastic recovery; the modified fibers' delayed elastic recovery was above 92% at 28°C and over 95% at lower temperatures of 5°C and -10°C, which is a great improvement to the common poly(ester-ether) fibers'.
Authors: Si Chen, Jian Wu Lan, Si Die Wu, Shao Jian Lin
Abstract: A type of benzoic acid end-capped ploy(ester-imide-ether) (PEIE) block copolymers was synthesized by melt polycondensation from polytetrahydrofuran diol (PTMG), 1,4-butanediol (BD), benzoic acid (BA) and a diacid monomer which was synthesized of trimellitic anhydride (TMA) with para aminobenzoic acid (PABA). The structures and properties of the copolymers were investigated by FT-IR spectroscopy and Ubbelohde viscometer, DSC and TGA. Some properties of the copolymer fibers such as breaking strength, breaking elongation and elasticity were also measured. The result demonstrated that the adding of BA can effectively reduce the inherent viscosities of PEIE. Especially the breaking strength, elastic recovery and heat stability of the fibers are improved obviously when adding 1 % (of the multiblock copolymer weight percentage) BA end capping agent.
Authors: Ya Ni Li, Rong Hui Guo, Jian Wu Lan, Shou Xiang Jiang, Shao Jian Lin, Si Chen, Jiao Jiao Shang
Abstract: In this study, Ni-Fe3O4 composite particles are deposited on polyester fabric modified with 3-aminopropyltrimethoxysilane (APTMS) by electroless plating. Surface morphology, chemical composition and crystal structure of the Ni-Fe3O4 deposits were investigated by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD), respectively. The magnetic properties of the Ni-Fe3O4 composite plated polyester fabric are also evaluated. Relatively dense plating was obtained under the given plating conditions. As the Ni-Fe3O4 weight on the treated fabric is 34.28g/m2, the saturation magnetization of the sample was 2.88emu/g.
Authors: Shao Jian Lin, Si Chen, Jian Wu Lan, Rong Hui Guo, Jiao Jiao Shang, Ya Ni Li, Jing Fan
Abstract: The elastic recovery property of a novel poly(ester-imide-ether) (PEIE) was prepared from the 1, 4-butanediol (BD), poly(tetramethylene glycol) (PTMG1000) and imide dicarboxylic acid based on 1, 2, 4-benzenetricarboxylic (TMA) and aminobenzoic acid (PABA) was studied. The elastic recovery of the PEIE was studied in the fiber form. The influences of the draw ratio, temperature and heat treatment on elastic recovery were investigated. The results show that the novel PEIE possesses the excellent elastic recovery at low temperature and the quickly-changed temperature is lower than that of traditional poly(ester-ether)s. Meanwhile, the heat treatment process can improve the elastic recovery of the PEIE because this process improves the crystallization of the hard segments.
Authors: Shao Jian Lin, Jian Wu Lan, Si Die Wu, Si Chen
Abstract: A diacid monomer was prepared from trimellitic anhydride and aminobenzoic acid,and a novel poly(ester-imide) was synthesized through the diacid monomer and the 1, 4-butanediol.The structure and chemical resistance, intrinsic viscosity and thermal property and crystallization of the poly(ester -imide) were characterized by FT-IR spectra,various organic solvents,a capillary Ubbelohde viscometer,differental scanning calorimetry (DSC) and thermogravimetric analysis (TGA) and crystallization rate instrument.The results showed that the poly(ester-imide) has excellent chemical resistance and thermal property,its intrinsic viscosity is 0.46dL/g,it has high glass transition temperature (Tg) and relatively low melting temperature (Tm).Moreover,the novel poly(ester-imide) has obvious crystallization and excellent property to spin into fibers.
Authors: Jiao Jiao Shang, Jian Wu Lan, Shao Jian Lin, Si Chen, Ya Ni Li
Abstract: A new poly(ester-imide-ether) (PEIE) was prepared by melt polymerization from 1,4-butanediol(BD), polytetrahydrofuran diol (PTMG) and a novel imide dicarboxylic acid monomer which was synthesized from 3,3',4,4'-biphenyltetracarboxylic di-anhydride(BPDA) and glycine acid(GLY). The structure, thermal behaviour and elastic recovery of polymer were characterized by FT-IR. thermogravimetric analysis (TGA), differential scanning calorimetry thermograms (DSC) and laboratory stretching machine. The results showed this polymer has excellent thermal stability, 5 % weight loss temperature was at 354°C. Meanwhile, the DSC curve showed that glass-transition temperature and crystallization temperature of the polymer were at -30 °C and 160 °C, respectively. The excellent elastic recovery was still displayed at low temperature.
Authors: Jiao Jiao Shang, Ming Lei, Shao Jian Lin, Jian Wu Lan, Xia Huang, Wen He
Abstract: Novel polymers with imide and ether were synthesized by pyromellitic dianhydride and Pyromellitic dianhydride (PMDA), 4,4'-metylenedianiline (MDA), amino-teminated polyoxypropylene (D2000). The structures and thermostability of polymer were characterized through FT-IR spectra, thermogravimetric analysis (TGA) and differental scanning calorimetry (DSC), solubility behavior was determined via seven solvents. The results indicate that these polymers have good chemical resistance and exhibit excellent thermostability owing to the introduction of imide units.
Authors: Si Chen, Shao Jian Lin, Jian Wu Lan, Jiao Jiao Shang, Ya Ni Li, Wen He, Xia Huang
Abstract: A series of multiblock thermoplastic ploy(ester imide ether)s elastomers derived from polytetramethylene glycol of molecule weight is 1000 (PTMG1000), 1,4-butanediol (BD), and a new imide diacid monomer were synthesized of Pyromellitic dianhydride (PMDA) and glycine (GLY). was synthesized by two-step melting polycondensation method. Their chemical structures were studied by 1H-NMR spectroscopy as well as their thermal properties of the copolymers were investigated from differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), respectively. Otherwise, the solubility of these polymers was characterized by various organic solvents. The effects of the hard/soft segment content on the thermal properties and soluble behavior were investigated. The result demonstrated that these copolymers had better thermal properties (Tm: 225~280°C and T5% : 350~353°C) than those of conventional thermoplastic elastomers due to the introduction of imide bond. At the same time, the polymers have good solubility.
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