An easy hydrolysis degradable polyester (EHDP) is synthesized; the fiber produced from which can be hydrolyzed by dilute basic solution easily. The properties of these kind polyesters are measured. The results show th...An easy hydrolysis degradable polyester (EHDP) is synthesized; the fiber produced from which can be hydrolyzed by dilute basic solution easily. The properties of these kind polyesters are measured. The results show that this kind polymer is suitable to be spun into filament The EHDP can be spun into staple fiber and manufactured into non-woven fabric. This fabric is used as disposable clothes. In composite spinning, the PET (polyethylen glycol terephthalate) or PA (polyamide) is used as continuous phase, and EHDP used as dispersed phase. Then the fabric of this kind fiber is treated by basic solution; the ultra-fine fiber fabric is obtained.The fineness of the fiber is about 0.045 dtex. In blend spinning, EHDP is mixed with polypropylene (PP) to produce hollow fiber with micro-holes in radical direction. This fiber is a usable material in filter especially in medical use.展开更多
Wood-polymer composites (WPC) were prepared from wood fiber and four kinds of plastics such as PE, PS, ABS, and SAN. The effects of different modifiers on the mechanical properties of the composites were studied. The ...Wood-polymer composites (WPC) were prepared from wood fiber and four kinds of plastics such as PE, PS, ABS, and SAN. The effects of different modifiers on the mechanical properties of the composites were studied. The results showed modifiers could raise the bonding strength of wood fiber with polymer and improve the mechanical properties of the composites. Different modifiers had different effects on the properties of wood-polymer composites, and comparatively the modifier of isocyanate produced a better result. Wood-polymer composite takes not only the advantages of both wood fiber and polymer, but waterproof, dimensional stability and dynamic strength are also significantly improved. Key word Wood fiber - Thermoplastic polyester - Wood-polymer composites - Modifier - Mechanical properties CLC number TB332 Document code A Foundation item: This study was supported by the Harbin Technology Tackle Key Plan (Development Research of Wood-Polymer Composites with High Wood Matrix) and by Heilongjing Nature Science Fund (Composite Mechanism Study of the Wood Polymer).Biography: XU Min (1963-), Female, Associate professor in Material Science and Engineering College, Northeast Forestry University, Harbin 150040, P. R. China.Responsible editor: Chai Ruihai展开更多
制备了间苯二甲酸双羟乙酯-5-磺酸钠(SIPE)含量为7.64%、聚乙二醇(PEG)含量为6.5%的高含量改性聚对苯二甲酸乙二醇酯(PET)。采用红外分析(FTIR)、核磁共振氢谱(1 H NMR)分析了改性PET的结构,SIPE、PEG以共聚的形式进入改性PET分子链中...制备了间苯二甲酸双羟乙酯-5-磺酸钠(SIPE)含量为7.64%、聚乙二醇(PEG)含量为6.5%的高含量改性聚对苯二甲酸乙二醇酯(PET)。采用红外分析(FTIR)、核磁共振氢谱(1 H NMR)分析了改性PET的结构,SIPE、PEG以共聚的形式进入改性PET分子链中且转化率分别高于94.8%和91.8%,表明两种单体在改性PET中的实际含量与理论添加量接近。利用毛细管流变仪研究了改性PET的流变行为,将剪切速率由1000 s^(-1)提高至8000 s^(-1),相比常规聚酯,SIPE/PEG改性PET剪切变稀更加明显;剪切速率对分子中平均链段数、熔体流动过程中大分子中的缠结点的影响不同,从而表现为随着剪切速率提高,导致破坏的缠结点使分子产生位移剪切黏度差异变小;在特性黏度为0.508~0.544 dL/g范围内,随着特性黏度的升高,改性聚酯剪切黏度增加,总体呈现黏流活化能降低、非牛顿指数降低、结构黏度指数升高的趋势;特性黏度最高的改性PET其非牛顿指数低均低于0.547、结构黏度指数均高于1.625,且变化规律不明显。特性黏度最高的改性PET纺丝过程中熔体流动稳定性略差,海-岛纤维成型过程中有黏连现象,碱减量开纤后水溶率为18.2%低于理论加入量,表明其制备的海-岛纤维不能实现岛相完全分离得到分布均匀的超细纤维。展开更多
文摘An easy hydrolysis degradable polyester (EHDP) is synthesized; the fiber produced from which can be hydrolyzed by dilute basic solution easily. The properties of these kind polyesters are measured. The results show that this kind polymer is suitable to be spun into filament The EHDP can be spun into staple fiber and manufactured into non-woven fabric. This fabric is used as disposable clothes. In composite spinning, the PET (polyethylen glycol terephthalate) or PA (polyamide) is used as continuous phase, and EHDP used as dispersed phase. Then the fabric of this kind fiber is treated by basic solution; the ultra-fine fiber fabric is obtained.The fineness of the fiber is about 0.045 dtex. In blend spinning, EHDP is mixed with polypropylene (PP) to produce hollow fiber with micro-holes in radical direction. This fiber is a usable material in filter especially in medical use.
基金Supported by the Harbin Technology Tackle Key Plan (Development Research of Wood-Polymer Composites with High Wood Matrix) and by Heilongjing Nature Science Fund (Composite Mechanism Study of the Wood Polymer).
文摘Wood-polymer composites (WPC) were prepared from wood fiber and four kinds of plastics such as PE, PS, ABS, and SAN. The effects of different modifiers on the mechanical properties of the composites were studied. The results showed modifiers could raise the bonding strength of wood fiber with polymer and improve the mechanical properties of the composites. Different modifiers had different effects on the properties of wood-polymer composites, and comparatively the modifier of isocyanate produced a better result. Wood-polymer composite takes not only the advantages of both wood fiber and polymer, but waterproof, dimensional stability and dynamic strength are also significantly improved. Key word Wood fiber - Thermoplastic polyester - Wood-polymer composites - Modifier - Mechanical properties CLC number TB332 Document code A Foundation item: This study was supported by the Harbin Technology Tackle Key Plan (Development Research of Wood-Polymer Composites with High Wood Matrix) and by Heilongjing Nature Science Fund (Composite Mechanism Study of the Wood Polymer).Biography: XU Min (1963-), Female, Associate professor in Material Science and Engineering College, Northeast Forestry University, Harbin 150040, P. R. China.Responsible editor: Chai Ruihai
