Ag/PVA导电聚合物制备工艺研究

以聚乙烯醇(PVA)为基体制备PVA/AgNO3复合膜,在NaBH4溶液中用化学还原法制得导电薄膜。研究了复合膜的组成、还原剂浓度、还原时间、还原温度对导电薄膜电阻的影响,得到的工艺条件为:温度20~25℃,AgNO3/PVA的质量比为0.15~0.25,还原剂浓度为0.06%,还原时间为3~4min。     

4-甲基咪唑在不锈钢腐蚀液中缓蚀作用的研究

本文介绍了奥氏不锈钢在Cl-浓度为1.5mol.L-1的缓蚀液中的电化学行为,分析不锈钢在不同温度和不同浓度中缓蚀液的腐蚀电位、腐蚀电流的变化规律,探索缓蚀液对不锈钢腐蚀速率的影响。结果表明:4-甲基咪唑缓蚀液对不锈钢的缓蚀效率在研究范围内随着温度和缓蚀液浓度的增加而增大,4-甲基咪唑是一种较好的高温吸附型缓蚀剂。     

玻璃纤维增强PA 6/PBT低吸湿共混物的力学性能

以马来酸酐接枝乙烯-辛烯共聚物(POE-g-MAH)和乙烯-甲基丙烯酸丁酯-丙烯酸缩水甘油酯三元共聚物(PTW)为复合相容剂,在平行同向双螺杆挤出机上熔融共混,制备了玻璃纤维增强聚酰胺(PA)6/聚对苯二甲酸丁二酯(PBT)共混物。考察了复合相容剂对增强共混材料力学性能的影响,并探讨了共混物的吸湿性与力学性能的关系。结果表明:相容剂的复合使用有协同作用;PA 6/PBT共混体系随w(PBT)增加,力学性能下降,w(PBT)增加到32.0%时,拉伸强度、弯曲强度、简支梁缺口冲击强度分别下降25.2%,15.8%,45.3%;并且随w(PBT)增加,共混体系对吸湿的敏感性降低。     

光对环己烷氯化制备氯代环己烷的影响

首先筛选了光做为环己烷氯化的引发剂,然后建立连续化反应装置,并着重考察了光对环己烷氯化的影响,最后确定最优工艺条件:用蓝色荧光做光源,光照区域占反应器70%,光照强度0.88～1.00 cd条件下,单程转化率为20.45%,选择性为94.49%。     

Rate Control Algorithm Considering Mobility in Mobile Ad Hoc Networks

For reducing the loss of data packet due to network congestion and mobility, rate control algorithm is effective means for ensuring the fair allocation of network resource among communication flows and alleviating network congestion. The Transport Control Protocol (TCP) was originally designed for wire-line networks, where the links are assumed to be reliable and with fixed capacities. However, the performance of TCP becomes very poor when it is directly used in ad hoc networks. Some optimization-based congestion control schemes have been proposed to improve TCP performance in ad hoc networks, but the mobility of hosts and route change frequently are not considered for designing rate control algorithm. In this paper, we propose rate control algorithms in a more practical way by taking into account link congestion and node movement. Numerical results show that the rate control algorithms can approach the globally optimal value and show the effect of the node mobility on the algorithms.     

Ethylene/hexene living copolymerization and ethylene/methyl 10-undecenoate copolymerization by titanium complexes bearing phenoxy-phosphine or thiophenoxy-phosphine ligands

Several non-metallocene-type titanium(IV) complexes containing phenoxy-phosphine or thiophenoxy-phosphine ligands of type, (2-R₁-4-R₂-6-PPh₂-C₆H₂X)₂TiCl₂ (2a: X = O, R₁ = R₂ = t-Bu; 2b: X = O, R₁ = R₂ = cumyl; 2c: X = S, R₁ = SiMe₃, R₂ = H) have been synthesized by treating TiCl₄ with the corresponding ligands 2-R₁-4-R₂-6-PPh₂-C₆H₂XH in the presence of n-BuLi. The complexes 2a-c were investigated as the catalysts for ethylene with 1-hexene and/or polar alkenes copolymerizations. The catalytic activity and the comonomer incorporation were highly dependent upon catalyst and reaction conditions employed. Among these complexes, 2a can not only promote ethylene/1-hexene living copolymerization at room temperature, but also can utilize ethylene with methyl 10-undecenoate copolymerization.     

Process of grafting styrene onto LLDPE by swelling and suspension copolymerization

A technology of swelling and suspension copolymerization was conducted to graft styrene onto linear low‐density polyethylene (LLDPE). The graft mechanism of styrene with LLDPE had been described by ¹H NMR and IR. The mean particle diameter and size distribution of the products with different proportions of LLDPE to styrene monomer were calculated. The morphology and thermal behavior of copolymers were characterized by scanning electron microscopy and differential scanning calorimetry. The glass transition temperature of copolymers increased with the addition of LLDPE, which proved the existence of the polyethylene‐g‐polystyrene copolymer. The grafting efficiency and granulation rate of suspension copolymerization were investigated. It was found that the grafting efficiency increased and the granulation rate decreased with the addition of LLDPE. POLYM. ENG. SCI., 50:1713–1720, 2010. © 2010 Society of Plastics Engineers     

北方城镇污水处理厂升级改造及工程实例

为满足污水处理厂新的污染物排放标准,我国很多污水厂正在进行升级改造.通过比较北方城镇几个污水厂进水水质,分析总结了北方城镇污水水质特点;从污水处理工艺升级改造方面提出了污水处理厂升级改造技术措施和方法;以青岛市的两个污水处理厂、德州污水处理厂和沂水污水处理厂为例介绍了北方城镇污水处理厂升级改造工程实例.     

SBBR不同填料类型的挂膜启动

填料是SBBR反应器不可或缺的组成部分,填料的选择在很大程度上决定了反应器的处理效果和推广使用。在挂膜启动过程中,通过几种不同类型填料进行比较得出:流动填料挂膜时出水水质较差,生物膜容易发生脱落;固定悬挂形式的化工填料挂膜效果较好,但化工原料的大量使用不符合环保和经济原则;生物填料类型则容易腐败或取材不易,但挂膜效果明显,有很大的发展空间。     

建筑节能涂料的制备及评定

介绍了建筑节能涂料的隔热节能原理、配制工艺、隔热性能比较,同时介绍了各种材料的选择、产品的技术指标以及节能计算方法。