The column wicking technique was applied to estimate the surface free energy of cellulose, the importance of which is to obtain a real effective capillary radius, Reff, initially from the plot of Washburn penetration ...The column wicking technique was applied to estimate the surface free energy of cellulose, the importance of which is to obtain a real effective capillary radius, Reff, initially from the plot of Washburn penetration distance versus time. Since the cellulose sample could not be packed with good reproducibility, therefore, Reff can not be obtained readily from the slope of the plot. A method was developed in this paper by uniting all apparent packing heights with a unique value to deduce a real effective capillary radius. Based on the defined critical packing height related to the critical packing density, the surface free energy and acid-base properties of cellulose Sigma C8002 were estimated.展开更多
使用磷酸和木质素纤维制备了磷化纤维素(PCL)阴离子溶液,使用甲壳素脱除乙酰基之后得到的壳聚糖制备了壳聚糖(CH)阳离子溶液,然后采用层层自组装(layer by layer self-assembly technique,LBL)技术对无色纯棉织物进行了阻燃处理。首先...使用磷酸和木质素纤维制备了磷化纤维素(PCL)阴离子溶液,使用甲壳素脱除乙酰基之后得到的壳聚糖制备了壳聚糖(CH)阳离子溶液,然后采用层层自组装(layer by layer self-assembly technique,LBL)技术对无色纯棉织物进行了阻燃处理。首先通过红外光谱(FT-IR)对磷化纤维素进行了结构表征,并通过垂直燃烧(UL94)、热重(TG)、微型燃烧量热仪(MCC)和烟密度测试仪(SDT)等研究阻燃棉织物燃烧和热降解性能。FT-IR测试结果表明:磷化纤维素制备成功。MCC的测试结果表明:试样热释放速率峰值与棉织物相比有大幅降低,显著抑制了棉织物受热分解时的热量释放。TG测试的结果表明:经阻燃处理后的棉织物在700℃的残炭含量明显增加。SDT结果表明:构筑LBL阻燃涂层后,光通量提高了24.9%,最大比光密度降低了65.24%,显著提高了棉织物的抑烟性能。展开更多
By nature, pineapple fiber (PALF) obtained from pineapple leaf is a smooth, shiny and white natural cellulosic fiber. In current investigation of spinning technique for pineapple leaf fiber based on cotton spinning me...By nature, pineapple fiber (PALF) obtained from pineapple leaf is a smooth, shiny and white natural cellulosic fiber. In current investigation of spinning technique for pineapple leaf fiber based on cotton spinning method comparison of produced yarn properties has been reported. For one of the investigations of this study, the fibers were cut into staple length and various properties of fibers were analyzed. Data and results acquired from this illustrated that there is excellent spinnability on the fiber. Two separate researches were conducted with consideration to produce resultant yarn by spinning of PALF. Yarn derived by solo spinning technique of 100% PALF and PALF blending with polyester and cotton fibers through binary blending technique in equal proportion has been spun, then yarn count, tensile properties, yarn evenness, hairiness have been evaluated and analyzed. The results from numerical simulations analysis indicated that yarn obtained from the Pineapple leaf fiber (PALF) had great potential to be used in apparels.展开更多
基金This work is financially supported by the Chinese Education Ministry and Donghua University of China (No. 2B01).
文摘The column wicking technique was applied to estimate the surface free energy of cellulose, the importance of which is to obtain a real effective capillary radius, Reff, initially from the plot of Washburn penetration distance versus time. Since the cellulose sample could not be packed with good reproducibility, therefore, Reff can not be obtained readily from the slope of the plot. A method was developed in this paper by uniting all apparent packing heights with a unique value to deduce a real effective capillary radius. Based on the defined critical packing height related to the critical packing density, the surface free energy and acid-base properties of cellulose Sigma C8002 were estimated.
文摘使用磷酸和木质素纤维制备了磷化纤维素(PCL)阴离子溶液,使用甲壳素脱除乙酰基之后得到的壳聚糖制备了壳聚糖(CH)阳离子溶液,然后采用层层自组装(layer by layer self-assembly technique,LBL)技术对无色纯棉织物进行了阻燃处理。首先通过红外光谱(FT-IR)对磷化纤维素进行了结构表征,并通过垂直燃烧(UL94)、热重(TG)、微型燃烧量热仪(MCC)和烟密度测试仪(SDT)等研究阻燃棉织物燃烧和热降解性能。FT-IR测试结果表明:磷化纤维素制备成功。MCC的测试结果表明:试样热释放速率峰值与棉织物相比有大幅降低,显著抑制了棉织物受热分解时的热量释放。TG测试的结果表明:经阻燃处理后的棉织物在700℃的残炭含量明显增加。SDT结果表明:构筑LBL阻燃涂层后,光通量提高了24.9%,最大比光密度降低了65.24%,显著提高了棉织物的抑烟性能。
文摘By nature, pineapple fiber (PALF) obtained from pineapple leaf is a smooth, shiny and white natural cellulosic fiber. In current investigation of spinning technique for pineapple leaf fiber based on cotton spinning method comparison of produced yarn properties has been reported. For one of the investigations of this study, the fibers were cut into staple length and various properties of fibers were analyzed. Data and results acquired from this illustrated that there is excellent spinnability on the fiber. Two separate researches were conducted with consideration to produce resultant yarn by spinning of PALF. Yarn derived by solo spinning technique of 100% PALF and PALF blending with polyester and cotton fibers through binary blending technique in equal proportion has been spun, then yarn count, tensile properties, yarn evenness, hairiness have been evaluated and analyzed. The results from numerical simulations analysis indicated that yarn obtained from the Pineapple leaf fiber (PALF) had great potential to be used in apparels.
