Fabrication of Hollow Microporous Carbon Spheres from Hyper‐Crosslinked Microporous Polymers

Porous carbon materials prepared from the porous organic polymers are currently the subject of extensive investigation. On the basis of their interesting applications, it is highly desirable to develop new synthetic methodologies to obtain carbon materials with controllable pore size and morphology. Herein, a facile synthesis of hollow microporous carbon spheres (HCSs) from hollow microporous organic capsules (HMOCs) with a good control over the pore morphology, hollow cavity, and the shell thickness is reported. The highly porous hollow carbon spheres are prepared by the pyrolysis of HMOCs‐based microporous polymers. The synthetic parameters, such as hypercrosslinking and pyrolysis conditions, are optimized to modify the porous structures and the properties. The morphology and porosity as well as energy storage applications of the microporous structures HCSs, derived through a combination of divinylbenzene‐crosslinking and micropore‐generating hypercrosslinking, are discussed. These findings provide a new benchmark for fabricating well‐defined HCSs with great promise for various applications.     

沐阳闸交通桥承载能力分析研究

摘要：沭阳闸交通桥经过50多年运行,由于自然和人为因素的长期作用,交通桥各部位混凝土结构都逐渐出现老化,因此,有必要对其承载能力进行分析研究,为更好地评价水闸的安全状态提供数据标准,为单位运行管理提供科学依据。针对沭新闸交通桥实际状况,在现场安全检测、现场试验、工程复核的基础上,对其承载能力分析表明,交通桥混凝土碳化较严重,钢筋保护层不足,对钢筋耐久性有较大影响,在实际运行工况下,交通桥承载能力不足,存在严重安全隐患。     

水利工程泵送混凝土裂缝的防治措施浅析

摘要：水利工程混凝土结构需要长期承受各种荷载的作用,不可避免会产生裂缝、破损等情况。而泵送混凝土结构中裂缝的存在和发展,破坏了水工建筑结构的整体性,导致水工建筑物内部钢筋锈蚀,从而降低结构物的耐久性,并影响其正常使用,严重时甚至会危害人民群众的生命财产安全。对泵送混凝土裂缝的成因及防治措施进行了探讨,提出了应采取的防治措施,将混凝土裂缝带来的影响减小到最低。     

关于ADSS光缆的电腐蚀及防护措施的探讨

介绍了ADSS光缆产生电腐蚀的现象并对其进行了具体分析，并给出防止ADSS产生电腐蚀的防护措施。     

Role of in-situ Formed Nonoxides Bonded Phases in Property Improvement of Alumina ULC Castables

In order to enhance performance of pre-cast shapes of alumina based castables,the present work explored the approach of forming in-situ bonding phases by incorporating Si powders and then heating in carbon embedded atmosphere. Using tabular alumina as aggregates,tabular alumina,SiC powders,Si powders,calcium aluminate cement,microsilica and ultrafineα-Al₂O₃ powders as matrix, alumina based ultra low cement（ULC） castables were prepared.Influences of Si powder addition at O, 4%,6%,8%and 10%（in mass ） on regular properties, cold modulus of rupture（CMOR）,hot modulus of rupture（HMOR）,thermal shock resistance（TSR） and microstructure of the castables after carbonization were investigated. After incorporation of Si powders and carbon embedded heating,the in-situ mullite and nonoxide phases such as SiAlON and SiC can be formed by oxidation, nitridation or carbonization reaction.HMOR and TSR of the castables with in-situ nonoxides bonding are obviously improved.After carbon embedded heating,the HMOR at 1 400℃increases from 1.6 MPa to 8.3 MPa,and the residual CMOR ratio after thermal shock increases from 64.9%to 137.9%when Si addition increases from 0 to 10%.     

耐热输送带的研制

采用使隔层高温炭化形成高强度保护层的方法制备了耐热输。该隔热层的配方为：ＳＢＲ１５０２１００，氧锌１０，硬酯酸２，古马隆１５，结炭剂２０，磷酸三苯酯６，软化剂１５，高耐磨炉黑３０，硫化剂６。     

磷酸活化褐煤制备活性炭影响因素研究

研究了用磷酸水溶液预浸渍处理云南先锋褐煤 ,在氮气保护下 40 0℃～ 60 0℃一步炭活化制备活性炭的影响因素 .研究结果表明 ,加温浸渍优于常温浸渍 ,并可提高制备的磷酸活性炭的碘吸附值 2 5 % ;磷酸活化褐煤反应中活化剂磷酸、添加剂硫酸主要影响活性炭的孔结构和吸附能力 ,而且磷酸浓度高活化效果好 ;炭活化温度、炭活化时间主要影响活性炭产品的收率 ,高温和长时间会导致更多的碳损失     

高温碳化张力对碳纤维性能影响

在碳纤维生产过程中张力贯穿于整个工艺过程,张力控制的划分可分为两个部分,一是预氧化张力控制;二是碳化张力控制。借助在线张力仪详细研究了特定工艺条件下的高温碳化张力对6K碳纤维拉伸强度、弹性模量和密度的影响。     

隔离型阻燃电缆和其它阻燃电缆性能比较

介绍阻燃电缆分级标准的变化和阻燃电缆阻燃材料的演变及发展,通过对隔离型阻燃电缆及其要达到的B1级燃烧性能阻燃电缆生产工艺的阐述及与其它类型阻燃电缆性能的比较,指出隔离型阻燃电缆在建筑工程中的应用优势。     

几种水泥基材料的渗透率及其超临界碳化的应用

孔隙度和渗透率是水泥基等多孔材料的重要指标,是水泥基材料内部离子迁移多物理场耦合预测模型中的关键材料参数。针对水泥基材料超亚临界碳化预测模型的质量控制方程,采用稳态法试验分析得到了液体渗透率、氮气渗透率、固有渗透率,采用体积法得到了材料孔隙度和含水饱和度,试件包括水泥砂浆、混凝土、水泥瓦、纤维水泥板等材料。其中水泥砂浆和混凝土材料固有渗透率分别为0.001mD和0.0001mD数量级,其他试件为0.01mD数量级;而混凝土的固有渗透率最低为9e-4mD。木纤维等纤维材料的掺加,将大幅增加材料的孔隙度和渗透率。最后使用得到的各项渗透率、孔隙度、含水饱和度,对水泥砂浆和水泥瓦的超亚临界碳化试验进行了多物理场耦合模拟,模拟结果与试验吻合较好。