水热法制备BaTiO3粉体

以Ｂａ（ＯＨ）２·８Ｈ２Ｏ和ＴｉＯ２为前驱物,在水热条件下制得了单一物相的ＢａＴｉＯ３粉体中产生裂纹等发现产物的物相与反应温度和前驱物的Ｂａ,Ｔｉ摩尔比有关,由负离子配位多面体生长基元模型分析了ＢａＴｉＯ３粉体的形成机理,指出了形成ＢａＴｉＯ３粉体的生长基元为Ｂａ（ＯＨ）１２＾１０－和Ｔｉ（ＯＨ）６＾２－,由此比较合理地解释了粉体的物相以及Ｂａ,Ｔｉ摩尔比对ＢａＴｉＯ３粉体形成的影响。     

钡钛醋酸盐凝胶制备BaTiO3粉体

本文报道了用ｓｏｌ－ｇｅｌ法制备钡醋酸盐凝胶，并分别作高灼烧和水热处理制备ＢａＴｉＯ３粉体。通过对产物的表征，比较了这两种处理过程，进而对水热条件下陶瓷粉体的形成机理作了探讨。由于水热条件，凝胶在反应介质中溶解，进而结晶形成晶粒，因此所形成的ＢａＴｉＯ３晶粒线度小；线度分布范围窄。晶粒形貌完整，明显优于高温灼烧处理后得到的粉体。     

K3PO4.7H2O存在下活泼亚甲基化合物的烷基化反应的研究

以苄氯与丙二酸二乙酯的烷基化反应为模型反应，借助ＨＰＬＣ，考察了在Ｋ２ＰＯ４．７Ｈ２Ｏ存在下，不同相转移催化剂，温度和Ｋ３ＰＯ４．７Ｈ２Ｏ的用量对反应的影响，并与其他碱进行了研究，在选定的条件下，考察了Ｋ３ＰＯ４．７Ｈ２Ｏ／ＴＢＡＢ反应体系的适用范围。     

BaTiO3超细粉的研究

通过对ＢａＴｉＯ３超细粉制备过程的探索，研究了影响化学配比及粒度的因素，提出反应过程中的ＰＨ值是影响Ｂａ：Ｔｉ比的关键因素，反应条件，分散剂，陈化剂及煅烧温度对粒度具有决定性作用，本研究提供了一条ＢａＴｉＯ３超细粉制备的新途径。     

pH值对Ti（O^nBu）4—Ba（OAc）2水解法合成BaTiO3粉体性能的影响

以乙酸和氢氧化钾为辅助原料，通过Ｔｉ（Ｏ＾ｎＢｕ）４－Ｂａ（ＯＡｃ）２水解法合成ＢａＴｉＯ３粉体。借助ＳＥＭ、ＴＥＭ、ＸＲＤ和ＥＰＭＡ等分析手段，研究了ＰＨ值对ＢａＴｉＯ３粉体性能的影响。论述了合成ＢａＴｉＯ３的反应机理，同时探讨了ＰＨ值对其反应机理的影响。     

Nd2Ti2O7-BaTiO3-TiO2系陶瓷的相结构和介电性能研究

对Ｎｄ２Ｔｉ２Ｏ７－ＢａＴｉＯ３－ＴｉＯ２系陶瓷的相结构和介电性能进行了研究。研究结果表明：少量Ｎｄ２Ｔｉ２Ｏ７（ＮＴ）掺杂到,ＢａＴｉＯ３（ＢＴ）中后形成铁电固溶体材料,其Ｃｕｒｉｅ温度随ＮＴ含量的增加向负温方向移动,同时,材料的晶粒尺寸不断增大;在ＮＴ－ＢＴ－ＴｉＯ２三元系统中,当ＢＴ含量低于６０％（质量分数）时,调整三者的配比,可使烧结后生成的ＢａＮｄ２Ｔｉ５Ｏ１４,Ｂａ２Ｔｉ９Ｏ２０,Ｎｄ     

BaTiO3超细粉的研究

通过对ＢａＴｉＯ３超细粉制备过程的探索，研究了影响化学配比及粒度的因素，提出反应过程中的ＰＨ值是影响Ｂａ：Ｔｉ比的关键因素。反应条件、分散剂、陈化及煅烧温度对粒度具有决定性作用。本研究提供了一条ＢａＴｉＯ３超细胞制备的新途径。     

pH值对Ti（O~nBu）_4－Ba（OAc）_2水解法合成BaTiO_3粉体

以乙酸和氢氧化钾为辅助原料，通过Ｔｉ（Ｏ￣ｎＢｕ）＿４－Ｂａ（ＯＡｃ）＿２水解法合成ＢａＴｉＯ＿３粉体。借助ＳＥＭ、ＴＥＭ、ＸＲＤ和ＥＰＭＡ等分析手段，研究了ｐＨ值对ＢａＴｉＯ＿３粉体性能的影响。论述了合成ＢａＴｉＯ＿３的反应机理，同时探讨了ｐＨ值对其反应机理的影响。     

超细BaTiO3粉体成瓷技术研究

基于液相化学共沉淀法合成超细ＢａＴｉＯ３粉末，研究了制备ＰＴＣ ＢａＴｉＯ３陶瓷的成瓷技术。利用ＸＲＤ和ＳＥＭ分析手段，对制备的ＢａＴｉＯ３陶瓷的结构进行了表征。对于影响ＢａＴｉＯ３陶瓷的主要性能，如致密化、ＰＴＣ效应和半导化性能的工艺参数进行了较为详细的研究和讨论。     

醇盐水解法合成高纯超细BaTiO3粉体

近年来，高纯超细ＢａＴｉＯ３粉体的制备技术发展十分迅速，它们在ＢａＴｉＯ３电子陶瓷的应用研究中起着日益重要的作用。尽管ＢａＴｉＯ３粉体的合成方法很多，但醇盐水解法有其不可解辨的优点。本文就醇盐水解法合成ＢａＴｉＯ３粉体的制备技术及其发展作了综合评述。     

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。