氧化锆超细粉合成新方法的机理初探

低温强碱合成氧化锆超细粉的方法是与其它方法不同的新合成法。应用Ｘ射线衍射、光电子能谱、热质量损失等方法分析了此新方法的不同之处，结果发现：在研磨在混合、反应过程中氧化锆晶核便已初步形成，经过热处理后便可长大形成立方相氧化锆超细粉。综合ＸＲＤ，ＸＰＳ等的分析结果，推测了水化氧化锆的结构，并提出“微区溶液”的概念对新方法的反应过程及反应机理进行了初步的探讨。     

氧化锆超细粉体的制造方法及应用

介绍了氧化锆超细粉体的性能、应用及制造方法。     

反向共沉淀法制备3YSZ超细粉体

以氯氧化锆为原料,氨水为沉淀剂,采用反向共沉淀法制备了3mo1%钇稳定氧化锆(3YSZ)超细粉体.系统考察了锆液初始浓度、焙烧温度及pH对产物的影响.通过TG-DTA、XRD分析,研究了前驱体的脱水、分解过程及粉体的相结构变化,实验得出了制备3YSZ超细粉体的最佳工艺条件.     

液相法制备氧化锆超细粉的团聚结构及对成型性能影响

本文从液机沉淀法制备氧化锆超细粉末不同工艺过程的显微结构变化，分析了粒子团聚机理以及团聚体结构对粉末加工成型性能的影响。指出液相法制备氧化锆超细粉末，因制备工艺条件不同，获得不同团聚结构的超细粉末。少团聚或软团聚体的粉末强度底，压制过程能破碎成大量细小碎粒，有助于获得高密度成型体。利用控制粒子团聚湿法工艺，可制取理想的氧化锆超细粉末。     

行星振动磨机的作用原理与特性分析

行星振动磨机是集行星磨与振动磨于一体的新型超细粉磨设备。本文通过分别在行星振动磨和振动磨中粉磨氧化锆、氯化铝和石英等物质，对比其粒度分布，比表面积和平均粒度的结果，说明行星振动磨机的粉磨特性。通过在不同转速，不同振幅下的粉磨，进一步分析行星振动磨机的工作原理和工作参数。运用Z射线衍射分析，说明在超微粉碎过程中发生机械力化学效应，从而增强了超细粉体的化学活性。     

醇盐锆水解制备ZrO2粉体的研究

选用实验室合成的醇盐锆为前驱体，采用ｓｏｌ－ｇｅｌ工艺制备了氧化锆粉体。利用ＴＥＤ、ＤＴＡ、ＸＲＤ、ＩＲ光谱等手段研究了水解过程及水解产物的热处理过程，若适当控制醇盐锆水解条件，可制成亚微米级分布均匀的超细粉体。     

一种新型砂磨机及其在亚微米粉碎中的应用

本文介绍了一种新型砂磨机的设备结构、工作原理及其在亚微米粉碎中的应用。举例利用该砂磨机对氧化锆和钛酸钡的粉碎结果,表明该设备适合对陶瓷材料进行超细粉碎和精细加工。     

纳米级二氧化锆粉体合成新方法

以分析纯氢氧化钠和氯氧化锆为原料,通过低温强碱合成法简单,方便地合成了二氧化锆晶核。通过４００℃的热处理形成四方或立方相二氧化锆超细粉,其一次颗粒尺寸约为７ｎｍ左右。     

高效超细粉磨机

高效超细粉磨机随着超细粉用量的增加和应用范围的不断扩大，廉价、高效的机械法超细粉生产技术便成为人们关注的焦点。美国某公司新近在传统搅拌球磨机的基础上，开发出一种新型磨机。它的特点是能量直接作用于搅拌的研磨介质，而非传统磨机大而笨重的外筒。所用研磨介质...     

不同工艺制备ZrO2—Al2O3复合陶瓷超细粉体的研究

采用正滴定工艺，反滴定工艺和水解工艺来制备ＺｒＯ２－Ａｌ２Ｏ３系复合陶瓷超细粉体。研究了制备工艺对水合氧化锆凝胶的包裹状态，煅烧后粉体中ＺｒＯ２颗粒的弥散状态以及烧结体显微结构的影响。结果表明采用水解工艺，ＺｒＯ２颗粒能均匀弥散在Ａｌ２Ｏ３颗粒周围，最终获得均匀细晶的陶瓷烧结体；在反滴定工艺中，虽然水合氧化锆凝胶能较好包裹Ａｌ２Ｏ３颗粒，但由于Ａｌ２Ｏ３颗粒本身得不到有效分散，因此在烧结体中出现了     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。