3,3-双(叠氮甲基)环氧丁烷-四氢呋喃共聚醚的合成及其链结构分析

３，３ 双（叠氮甲基）环氧丁烷 四氢呋喃共聚醚的合成及其链结构分析屈红翔冯增国谭惠民（北京理工大学化工与材料学院北京１０００８１）许保国周集义（化工部黎明化工研究院洛阳４７１００１）关键词叠氮粘合剂，阳离子开环共聚，序列长度，链节比，竞聚率将叠...     

基于产教研融合视角的“粘合剂与助剂”课程教学案例的构建与应用

“粘合剂与助剂”课程承担培养学生“分析评价能力”的任务。为了达成深度分析评价能力,课程从产学研融合的角度,构建与产业发展关联度高的教学案例。教学案例从课程引导、理论应用、问题分析、性能预测到技术创新,分布于课程教学的全过程。提出“原理分析法”和“拆解分析法”,用于分析能力训练。教学案例及深度分析方法经历多轮次教学实践,学生的课程综合能力考核成绩明显提升。基于产学研视角的全过程案例教学,对学生高层次分析和实践创新能力的达成起到有效推动作用。     

人牙釉质在人工唾液润滑下与不同偶件对摩时的摩擦学性能研究

在往复滑动摩擦磨损试验台上对比考察了人牙釉质自配副及其同钛合金和纯钛配副时的摩擦学性能.结果表明:牙釉质/牙釉质的稳态摩擦系数约为1.00,其磨损表面釉柱清晰可见,磨损机制表现为剥落和轻微犁削并存;牙釉质/钛合金的稳态摩擦系数约为0.92,磨损表面既有犁沟又有剥落,可以看到轮廓分明的釉柱;牙釉质/纯钛的稳态摩擦系数约为0.87,磨损表面存在纯钛转移膜.从摩擦系数的变化趋势、稳态摩擦系数的大小、磨损表面形貌和磨痕深度等角度来看,牙釉质/钛合金与牙釉质/牙釉质的摩擦磨损行为较为相似.     

结晶度与粘合剂对多孔钴酸镁超电容电极能量传递效率的影响

通过热解晶态的双金属配位聚合物前驱体得到镁/钴三元氧化物、多孔MgCo_2O_4纳米结构。研究表明,不同的水热反应时间产生具不同结晶度的同构前驱体,并且当热解温度与粘合剂分别选择500℃和聚四氟乙烯(PTFE)时,便可以获得具有好的能量传递效率(η)的最优电容量。相应的具有高比表面积与适中结晶度的Mg Co_2O_4电极材料具有最大电容量(348 F·g~(-1)),η值可达92.9%,经历1 000次循环后电容量保持率为93.7%的优异电化学性能。     

Determination of Water Diffusion Coefficients and Dynamics in Adhesive/ Carbon Fiber Reinforced Epoxy Resin Composite Joints

To determinate the water diffusion coefficients and dynamics in adhesive/carbon fiber reinforced epoxy resin composite joints,energy dispersive X-ray spectroscopy analysis(EDX)is used to establish the content change of oxygen in the adhesive in adhesive/carbon fiber reinforced epoxy resin composite joints.As water is made up of oxygen and hydrogen,the water diffusion coefficients and dynamics in adhesive/carbon fiber reinforced epoxy resin composite joints can be obtained from the change in the content of oxygen in the adhesive during humidity aging,via EDX analysis.The authors have calculated the water diffusion coefficients and dynamics in the adhesive/carbon fiber reinforced epoxy resin composite joints with the aid of both energy dispersive X-ray spectroscopy and elemental analysis.The determined results with EDX analysis are almost the same as those determined with elemental analysis and the results also show that the durability of the adhesive/carbon fiber reinforced epoxy resin composite joints subjected to silane coupling agent treatment is better than those subjected to sand paper burnishing treatment and chemical oxidation treatment.     

Effect of Binder on the Structure and Properties of Silicon Powder-supported TiO2 Photocatalysis Material

Recoverable TiO2 photocatalysis material supported by silicon powder was prepared with sol-gel method, afterwards the silica gol and sodium silicate were used as molding binder respectively to investigate their effects （including binder type and binder addition quantity） on the crystal structure and catalysis properties of photocatalyst. In this work, the catalysis activity was defined as the degradation rate of methyl orange solution upon ultraviolet lamp irradiation, and the specific areas were determined with nitrogen desorption method. TiO2 crystal form was measured with X-ray powder diffraction and their micro-morphology was observed with SEM. Experimental results indicate that these two binders do not affect the crystal form transformation of TiO2, but silica gol can increase the specific surface area of TiO2 photocatalyst obviously and the addition of sodium silicate can decrease it. In all, silica gol is a better candidate than sodium silicate for higher catalysis property. In conclusion, 6% silica gol is the optimal addition concentration. Under this condition, the ratio of anatase to rutile TiO2 is 64：36, the specific area is 29.67 m^2/g, and as expected, the degradation rate of methyl orange could be as high as 90% after irradiation for 5 days.     

超强纳米颗粒溶液粘合剂

无论是自然界普遍存在的非共价键相互作用,还是共价键结合,都可以产生界面粘附.粘附材料的应用需求广泛,涉及可穿戴设备、电子器件、医疗手术等诸多领域.近些年来,仿生结构粘附材料和仿生粘合剂已经得到了快速的发展,一些人工制备的粘附材料已投入实际应用.然而,结构微加工的局限性和合成路线的复杂性限制了它们的大规模生产.相比而言,纳米颗粒溶液提供了一种更简单和更容易实现强粘附的替代方法.本文就最近报道的"强各向异性粘附的纤维素纳米晶体悬浮液"作一亮点评述.     

氢化物-原子荧光光谱法测定建筑用粘合剂中汞

用硝酸－硫酸－高锰酸钾在高压锅中溶样，采用氢化物发生原子荧光光谱法测定建筑用粘合剂中汞。相对标准偏差为4．3％，回收率为87．6％－106％。该方法快速、简单、准确。     

牙用亚微米氧化锆增韧氧化铝陶瓷的摩擦磨损性能研究

考察了亚微米氧化锆增韧氧化铝陶瓷(Z2S)在人工唾液润滑下的摩擦磨损行为,并与目前口腔临床常用烤瓷材料Vita陶瓷和Dentsply陶瓷进行对比.结果表明:与Si3N4陶瓷配副时,Z2S的摩擦磨损性能优于Vita陶瓷和Dentsply陶瓷,其磨损率比Vita陶瓷和Dentsply陶瓷的磨损率低2个数量级,Z2S的主要磨损机制为轻微的磨粒磨损和塑性变形,并受ZrO2的摩擦诱导相变影响;与天然牙釉质配副时,Z2S不仅自身磨损低而且对天然牙釉质的磨损较小,天然牙釉质的磨损表面保持了较好的初始形态,其与天然牙釉质的配对性优于Dentsply陶瓷与天然牙釉质的配对性,是1种具有潜在应用前景的牙科修复材料.