运用数学模型对复合膜的等温吸湿曲线进行拟合,研究液体石蜡对麦麸纤维/小麦麸质蛋白复合膜吸湿性能、透水性能的影响,并测定其机械性能和光学性能变化。结果表明,复合膜的等温吸湿动力学过程符合Peleg模型( R^2 >0.97, E <5%),GA...运用数学模型对复合膜的等温吸湿曲线进行拟合,研究液体石蜡对麦麸纤维/小麦麸质蛋白复合膜吸湿性能、透水性能的影响,并测定其机械性能和光学性能变化。结果表明,复合膜的等温吸湿动力学过程符合Peleg模型( R^2 >0.97, E <5%),GAB模型能精确模拟复合膜的吸附等温线( R^2 >0.99, E <5%)。添加5%~20%的液体石蜡可降低复合膜平衡吸湿率和水蒸气透过系数(water vapor permeability,WVP),提高复合膜的水接触角,其中添加15%的液体石蜡所制备的复合膜WVP降低了约47.8%,水接触角从54.2°提高至88.9°。添加液体石蜡同时降低了复合膜的抗拉强度(tensile strength,TS)、断裂延伸率(elongation at break,EAB)和透明度,加深了复合膜的色泽。添加15%液体石蜡的复合膜TS、EAB和透明度与对照相比分别降低了约49.1%、33.5%和71.6%。综合添加液体石蜡对复合膜的各项性能影响,推荐15%左右液体石蜡为适宜添加量。本研究结果可为液体石蜡/麦麸纤维/小麦麸质蛋白复合膜制备工艺参数的进一步优化提供参考。展开更多
A simplified probabilistic analysis of geomembrane punctures from granular material was presented when subjected to liquid pressure.The probability distribution of contact force between geomembrane and granular materi...A simplified probabilistic analysis of geomembrane punctures from granular material was presented when subjected to liquid pressure.The probability distribution of contact force between geomembrane and granular material was obtained based on the principle of equal probability and assumptions that grains are spheres with constant size.A particle flow code PFC3Dwas employed to simulate the contact process which indicates a good agreement with the theoretical probabilistic analysis.The odds of geomembrane puncture from grains of constant size were obtained by evaluating the puncture force which should not exceed the puncture resistance of geomembrane.The effects of grain radius,grain rigidity and liquid pressure were studied in more detail and displayed in graphs.Both high-level of liquid pressure and large grain can result in high risk of geomembrane puncture.The influence of grain rigidity on the geomembrane puncture odds is significant.For granular material with a grain size distribution,the geomembrane puncture odds can be estimated by the grain size distribution,served as weight function and it is a cautious design if the largest grain is chosen as the design grain size.展开更多
文摘运用数学模型对复合膜的等温吸湿曲线进行拟合,研究液体石蜡对麦麸纤维/小麦麸质蛋白复合膜吸湿性能、透水性能的影响,并测定其机械性能和光学性能变化。结果表明,复合膜的等温吸湿动力学过程符合Peleg模型( R^2 >0.97, E <5%),GAB模型能精确模拟复合膜的吸附等温线( R^2 >0.99, E <5%)。添加5%~20%的液体石蜡可降低复合膜平衡吸湿率和水蒸气透过系数(water vapor permeability,WVP),提高复合膜的水接触角,其中添加15%的液体石蜡所制备的复合膜WVP降低了约47.8%,水接触角从54.2°提高至88.9°。添加液体石蜡同时降低了复合膜的抗拉强度(tensile strength,TS)、断裂延伸率(elongation at break,EAB)和透明度,加深了复合膜的色泽。添加15%液体石蜡的复合膜TS、EAB和透明度与对照相比分别降低了约49.1%、33.5%和71.6%。综合添加液体石蜡对复合膜的各项性能影响,推荐15%左右液体石蜡为适宜添加量。本研究结果可为液体石蜡/麦麸纤维/小麦麸质蛋白复合膜制备工艺参数的进一步优化提供参考。
基金Project(51079047)supported by the National Natural Science Foundation of China
文摘A simplified probabilistic analysis of geomembrane punctures from granular material was presented when subjected to liquid pressure.The probability distribution of contact force between geomembrane and granular material was obtained based on the principle of equal probability and assumptions that grains are spheres with constant size.A particle flow code PFC3Dwas employed to simulate the contact process which indicates a good agreement with the theoretical probabilistic analysis.The odds of geomembrane puncture from grains of constant size were obtained by evaluating the puncture force which should not exceed the puncture resistance of geomembrane.The effects of grain radius,grain rigidity and liquid pressure were studied in more detail and displayed in graphs.Both high-level of liquid pressure and large grain can result in high risk of geomembrane puncture.The influence of grain rigidity on the geomembrane puncture odds is significant.For granular material with a grain size distribution,the geomembrane puncture odds can be estimated by the grain size distribution,served as weight function and it is a cautious design if the largest grain is chosen as the design grain size.
