Effect of miscibility and forced compatibility on damping properties of CIIR/PAc blend

In this study, a kind of novel damping materials was prepared based on the blend of chlorinated butyl rubber (CIIR) and polyacrylate (PAc) synthesized by different molar ratio of butyl methacrylate and ethyl acrylate. Research results from experiments and analyses by employing DMA, TEM, and FTIR show that whether at a cocured system or noncocured system, it can be achieved to shift a loss peak of CIIR towards a higher temperature region and to keep the damping value from markedlly decreasing, which broadens the effective damping function area of CIIR to the vicinity of ambient temperature. In the former system, the thermodynamical miscibility of CIIR and PAc, to some extent, is predominated by the molecular design of PAc, while in the latter system, covulcanized networks play a more significant role in improving compatibility and abating the peak split, though the suppression effect of thermal stress on the transition of CIIR T_ll transition still can not be neglected. Furthermore, transition state derived from the cocuring CIIR and PAc cannot make the phase separation completely take place, and consequently results in the deformation of phase morphology of the cocured CIIR/PAc blend. It is the influence of thermodynamics miscibility and forced compatibility in different size that makes the suppression effect of foreign PAc on CIIR T_ll transition be controllable. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3127–3133, 2006     

悬浮法合成聚丙烯腈高吸水性树脂

以偶氮二异丁腈为引发剂，用悬浮聚合法合成了交联聚丙烯腈，然后对其进行水解，得到了高吸水性聚丙烯腈。交联剂用量和水解条件对树脂吸水倍数的影响很大。树脂吸去离子水倍数为420倍，平均粒径为250μm。     

高效乙烯聚合催化剂的制备——I．催化剂的制备规律

研究了新型含镁络合物的结构、性质及其用于制备高效乙烯聚合催化剂的制备规律。结果表明：将镁、有机醇以及不与镁发生“格式反应”的卤代烷相互作用可迅速发生反应形成新型含镁络合物溶液。该络合物在溶液中可析出结晶。具有特定的化学结构．可以均匀承载于多孔硅胶的孔隙中，负载TiCl4后制备出形态良好的球形高效乙烯集合催化剂。     

强酸性阳离子交换树脂催化合成氯乙酸异辛酯的研究

对采用７３２强酸性苯乙烯系阳离子交换树脂作催化剂合成氯乙酸异辛酯进行了实验研究，提出了适宜的反应条件。实验结果表明，该法酯化率高、过程简便、产物颜色浅，优于浓硫酸作催化剂。     

Low temperature SCR of NO with NH3 over carbon nanotubes supported vanadium oxides

A novel multiwalled carbon nanotube (CNTs) supported vanadium catalyst was prepared. The structure of catalyst prepared was characterized by TEM, BET, FTIR, XRD and temperature-programmed desorption (TPD) methods. The results indicated that vanadium particles were highly dispersed on the wall of carbon nanotubes. The V₂O₅/CNT catalysts showed good activities in the SCR of NO with a temperature range of 373–523 K. The Lewis acid sites on the surface of V₂O₅/CNT are the active sites for the selective catalytic reduction (SCR) of NO with NH₃ at low temperatures. It was suggested that the reaction path might involve the adsorbed NH₃ species reacted with NO from gaseous phase and as well as the adsorbed NO₂ species. The diameter of CNTs showed positive effect on the activities of the catalysts. Under the reaction conditions of 463 K, 0.1 Mpa, NH₃/NO = 1, GHSV = 35,000 h⁻¹, and V₂O₅ loading of 2.35 wt%, the outer diameter of CNTs of 60–100 nm, the NO conversion was 92%.     

3-甲基-4-硝基亚胺基全氢化-1,3,5-(口恶)二嗪的合成

3-甲基-4-硝基亚胺基全氢化-1,3,5-二嗪是合成第二代烟碱类杀虫剂噻虫嗪的重要中间体。介绍并评价了文献中所报道的合成3-甲基-4-硝基亚胺基全氢化-1,3,5-二嗪的方法。以硝基胍为起始原料成功的合成了3-甲基-4-硝基亚胺基全氢化-1,3,5-二嗪,总收率为68.2%。     

提高炼厂气综合利用水平的途径

公司将进行催化裂化装置、气体分馏装置改造。预计改造后的丙烯产量将达到5．0万t／a，丁烯等C4产品大大增加。聚丙烯是公司目前丙烯化工利用的唯一产品，年产量2万t，C4的化工利用尚属空白。因此开辟过剩丙烯利用新途径，带动C4产业发展，形成化工产业链，提高公司炼厂气的综合利用水平，具有重要意义。合成异丙醇或环氧丙烷，就是这样一个突破口。     

Texaco煤气化装置长周期运行影响因素分析

介绍了Texaco煤气化工艺流程,从原料煤种、水煤浆浓度、操作工艺、关键设备等几个方面讨论了影响装置长周期运行的因素,提出了延长气化装置运行周期的措施。     

高纯超细活性γ-Al2O3的应用及其研究进展

从γ-Al2O3的结构和特性出发介绍了高纯超细活性γ-Al2O3在高性能特种陶瓷合成、催化剂或其载体及化学机械抛光等方面的应用，综述了国内外有关高纯超细Al2O3多种制备方法的研究现状和发展趋势。     

年最大洪峰流量群居蜘蛛优化投影寻踪预测模型

年最大洪峰流量预测,受较多的复杂因素的影响,不确定性较强,用常规统计方法做出准确预报具有较大困难。从水文序列本身出发,提出将投影回归模型应用于年最大洪峰流量预测,为了更好获得投影寻踪模型参数和预测精度,提出了运用延迟相关系数法确定回归预测因子、群居蜘蛛算法优化投影寻踪模型最佳投影方向参数a、利用最小二乘法确定多项式的权系数c、岭函数个数M的群居蜘蛛优化投影寻踪年最大洪峰流量预测模型,结合长江宜昌站(1882年-2004年)的年最大洪峰流量资料进行实例预测,训练阶段平均绝对相对误差为8.61%,预测阶段平均绝对相对误差为10.51%,该模型预测效果较好,模型结果稳定,可有效应用于年最大洪峰流量预测。