抗皱纤维素膜的制备与性能研究

利用氢氧化钠-尿素-硫脲溶剂体系将纤维素浆粕溶解,向溶液中添加1,2,3,4-丁烷四羧酸,配制成纤维素纺丝液并制得了纤维素膜.通过红外光谱分析和折皱回复角、断裂强力等测试,表征了膜的结构和性能.结果表明,该纤维素膜在一定条件下可以发生酯化交联反应并具有抗皱性能.改变1,2,3,4-丁烷四羧酸的用量、反应温度和反应时间,可以在纤维素膜的折皱回复角和断裂强力之间取得某种平衡.     

Mechanical properties of carbonfi ber/cellulose composite papers modified by hot-melting fibers

Carbon fiber(CF)/cellulose(CLS) composite papers were prepared by papermaking techniques and hot-melting fibers were used for modification. The mechanical properties of the obtained composite papers with different CF,CLS and hot-melting fiber ratios were studied and further discussed. It is observed that,for both CF/CLS composite papers and those modified by hot-melting fibers,the normal stress firstly increases and then declines with the addition of carbon fibers. The results also show that with the addition of hot-melting fibers,the modified papers exhibit enhanced mechanical performance compared to CF/CLS composite papers. Through SEM characterization,it is confirmed that the improvement of mechanical properties attributes to the reinforcement of adhesive binding at the fiber overlap nodes. Also,through four-probe method,the resistivity and the electrical performance of the modified and unmodified papers were characterized and the result shows that the hot-melting fiber modification brings no harm to the electrical properties.     

提高醋酸纤维薄膜电泳实验成功率的探讨

针对人血清蛋白醋酸纤维薄膜电泳学生实验中薄膜选择和处理不当、点样不均匀，血清蛋白分离不良、搭桥不规范，产生斜泳、电泳条件掌握不好，区带分离不开、漂洗时膜重叠，造成血清蛋白粘连、染色不好，背景和区带不清晰等6个容易出现问题的环节，收集、展示了上述原因而导致实验失败的图谱，并与实验成功的图谱作对照。对实验的各个操作环节进行了深入探讨、提出了具体改进的措施，使学生一次成功率达到90%以上。该文提高教学质量具有重要意义。     

STUDY ON THE BIODEGRADATION OF CELLULOSE FIBER/BASALTIC FIBER COMPOSITE PAPERBOARD

INTRODUCTIONThe Biodegradation of cellulose fiber/basaltic fiber composite paperboard prepared by reference [1] was studied experimentally and the influence factors on the biodegradation velocity were researched. EXPERIMENTALExperimentalEquipmentThe equipment of the biodegradation experiment is shown in figure 1. The carbon dioxide gas was removed when the compressed air generated by air pump passed through the taper bottle filled with sodium hydroxide solution, and then, the air tra…     

醋酸纤维薄膜电泳法分离测定鸡血清蛋白质

应用醋酸纤维薄膜电泳法分离测定了鸡血清中不同蛋白质。对电流强度、电泳时间和点样量等影响分离效果的条件进行了选择。并用光度计和薄层扫描仪对样品进行了定量测定。     

森林碳汇计量方法的研究

通过植物分子式的方法确定不同树种的含碳量,以此为参数对我国的森林碳汇量进行了估算。结果表明:该计量方式既简单易行,又具有规范性及重复操作性,可动态预测我国森林碳汇量。并且,通过我国几次森林资源清查数据和森林资源系统仿真模型,该方法可对我国森林碳汇功能发展趋势作出动态预测。     

THE INDUSTRIAL UTILIZATION OF CHEMICAL MODIFIED AGRICULTURAL RESIDUES

INTRODUCTIONToday, the world's industry is utilizing less than 10% of biomass of raw materials from plantation [1]. Agricultural residues, such as cereal straws are important and abundant renewable organic resources of energy and production of a diversity of chemicals, including ethanol production [2], activated carbon [3] and ion exchangers [4]. Many other applications for Cereal straws are in the process of being developed.In china, wheat, maize and sorghum are the three major crops, w…     

腐植酸与纤维素的复合物对废水中重金属离子络合性能的研究

风化煤中提取的腐植酸类物质对废水中有害重金属离子具有一定的络合作用，但有沉积速度慢，时间长，沉积不易分离等缺点，本文用腐植酸钠与纤维素反应产生的复合物，对水中重金属离子的络合性能进行了研究，发现络合效果比单纯用腐植酸钠效果要好。因而腐植酸纤维素 事物有望成为重金属污水处理剂。     

纤维素－刚果红培养基对土壤纤维分解菌的直接计数

介绍了一种新的鉴别培养基，含酸洗纤维素和染料刚果红．纤维分解菌能在其上产生一清晰可见的红色水解圈，明显区别于其它微生物类群．用该培养基可快速、准确检测样本中纤维分解菌的数目     

海藻酸钠/醋酸纤维素渗透蒸发共混膜的研究

本研究以海藻酸钠（ＳＡ）和醋酸纤维素（ＣＡ）为膜材料,研究了ＳＡＣＡ渗透蒸发共混膜的制膜条件,分析了该膜的渗透蒸发性能及影响因素．结果表明,ＳＡＣＡ共混膜对乙醇—水混合液具有良好的分离性能．