电导滴定法测定加碘盐中碘酸钾含量

以Ｂａ（ＯＡｃ）２为滴定剂，对ＫＩＯ３溶液进行电导滴定，利用电导率的演变来确定终点，通过计算求得ＫＩＯ３的浓度，检测下限为２．５×１０＾－５ｍｏ·Ｌ＾－１．最佳条件下的相对误差为－０．４％，此法成功地测定了加碘盐中的碘含量。     

由ZnSO4·7H2O制备硼酸锌

研究了由ＺｎＳＯ４·７Ｈ２Ｏ合成七水硼酸锌阻燃剂的工艺条件,合成出合格的产品,并测定了硼酸锌添加到ＰＶＣ中的阻燃效果．由ＺｎＳＯ４·７Ｈ２Ｏ合成２ＺｎＯ·３Ｂ２Ｏ３·７Ｈ２Ｏ的主要工艺条件是：常温,硫酸锌和硼砂的配料比为１．０５：１～１：１,液固比为４．５：１,反应时间大于６．５ｈ．七水硼酸锌的分子式为２ＺｎＯ·３Ｂ２Ｏ３·７Ｈ２Ｏ,该物质开始脱结晶水的温度高于４７３Ｋ,可用于塑料等材料的阻燃剂．     

298K时Li~+,Na~+,K~+/CO_(-3)~2H_2O四元体系相图和液相物化性质测定

用等温溶解平衡法研究了四元体系Ｌｉ＋ , Ｎａ ＋ , Ｋ＋ ／ＣＯ２ －３ Ｈ２ Ｏ２９８Ｋ 时盐类的溶解度及饱和溶液的物化性质（ 密度、折光率、粘度、电导率、ｐＨ 值） , 研究表明： 该四元体系２９８Ｋ 溶解度相图由两个无变量点、五条溶解度曲线和四个结晶区构成。四个结晶区分别对应于组分Ｌｉ２ ＣＯ３ , Ｎａ２ ＣＯ３·１０Ｈ２ Ｏ, Ｋ２ ＣＯ３·３／２Ｈ２ Ｏ 及复盐Ｎａ２ ＣＯ３·Ｋ２ ＣＯ３·Ｈ２ Ｏ。复盐Ｎａ２ ＣＯ３·Ｋ２ ＣＯ３·Ｈ２ Ｏ２９８Ｋ 时为不相称溶解化合物     

25℃和40℃时（C_2H_5）_2NH－（C_2H_5）_2NH·H_2CO

２５℃和４０℃时（Ｃ＿２Ｈ＿５）＿２ＮＨ－（Ｃ＿２Ｈ＿５）＿２ＮＨ·Ｈ＿２ＣＯ＿３－Ｈ＿２Ｏ体系的溶解度Ｂ．Ａ．ПａＨａｃｅＨＫＯ等氨碱法制纯碱的条件下，在２５℃及４０℃时确定在水溶液中形成固相条件的（Ｃ＿２Ｈ＿５）＿２ＮＨ－（Ｃ＿２Ｈ＿５）＿２ＮＨ...     

无机盐对染料与非离子表面活性剂相互作用的影响

用光度法研究了对非离子表面活性剂ＴＸ－１００有盐溶、盐析作用的两种无机电解质（Ｎａ_２ ＳＯ_４和ＫＳＣＮ）对离子染料（漂蓝６Ｂ）与ＴＸ－１００相互作用的影响,得到了３种体系的相互作用常数 Ｋ及临界胶团浓度 ＣＭＣ。对于 ＥＣＡＢ＋ ＴＸ－ １００, ＥＣＡＢ＋ ＴＸ－ １００＋ Ｎａ_２ ＳＯ_４和 ＥＣＡＮ＋ ＴＸ－ １００＋ ＫＳＣＮ ３种体系,其 Ｋ值分别为 ２５５０, ７５３２和２４００ｄｍ_３· ｍｏｌ~（－１）; ＣＭＣ值分别为 ２． ５ × １０~（－４）,１．８７×１０~（－４）和１．８３×１０~（－４）ｍｏｌ·ｄｍ~（－３）。对所得结果作了合理解释。     

化学共沉淀法制备微晶PSZ陶瓷的显微结构与力学性能

采用化学共沉淀法制备ＺｒＯ２－ＭｇＯ－Ｙ２Ｏ３系和ＺｒＯ２－ＭｇＯ－Ｙ２Ｏ３系均匀超细活性粉末，经化学组成和显微结构设计，获得了固溶湿度小于等于１５５０℃且致密烧结的微晶ＰＳＺ复相陶瓷，其常温抗弯强度为７６６ＭＰａ，断裂韧性Ｋ１ｃ为１２．５ＭＰａ·ｍ＾１／２。研究了ＭｇＯ和Ａｌ２Ｏ３以及１１００℃热处理时间对材料显微结构、相组成和力学性能的影响。     

三水硝酸与18—冠—6配合物的相平衡研究

采用半微量相平衡方法研究了三元体系Ｃｅ（ＮＯ３）３．３Ｈ２Ｏ－１８Ｃ６－Ｃ２Ｈ５ＯＨ在３０３．１５Ｋ时的溶解度,测定了各饱和溶液的折光率。该体系在３０３．１５Ｋ时仅生成一种化学计量的配合物Ｃｅ（ＮＯ３）３．１８Ｃ６．３Ｈ２Ｏ。     

Fe_2O_3－SrO－TeO_2系半导体玻璃电导的研究

用准急压冷法制成Ｆｅ_２Ｏ_３－ＳｒＯ－ＴｅＯ_２系半导体玻璃并对其直流电导率进行了测定。玻璃形成范围为（以摩尔计）；０≤Ｆｅ_２Ｏ_３≤２３％；０≤ＳｒＯ≤１８％；７５％≤ＴｅＯ_２＜１００％。通过Ｓｅｅｂｅｃｋ系数的测定确认Ｆｅ_２Ｏ_３－ＳｒＯ－ＴｅＯ_２系玻璃为ｎ型半导体玻璃。２００℃的直流电导率为３．７２×１０￣（－５）～１．８２×１０￣（－６）Ｓ·ｃｍ￣（－１）。直流电导率随着Ｆｅ_２Ｏ_３含量的增加而增加，１６５℃时的载流子迁移率和浓度分别为１．１２×１０￣（－９）～３．６７×１０￣－７ｃｍ￣２·Ｖ￣（－１）·Ｓ￣（－１）和２．１７×１０￣（２１）～８．３３×１０￣１９ｃｍ￣（－３）．讨论的结果表明Ｆｅ_２Ｏ_３－ＳｒＯ－ＴｅＯ_２系玻璃的电导机理符合小极化子跳越理论。     

KTa0.55Nb0.45O3薄膜的介电和铁电及热释电性能研究

在ＢＴ／Ｐｔ／Ｔｉ／ＳｉＯ２／Ｓｉ衬底上用溶胶－凝胶法制备了ＫＴａ０．５５Ｎｂ０．４５Ｏ３（ＫＴＮ）薄膜,０．５μｍＫＴＮ－０．０８μｍＢＴ薄膜在２５℃,１．０ｋＨｚ时,其εｒ＝１１１４,ｔａｎδ＝２．５％;１２℃时,其中Ｐｒ＝２．１μＣ／ｃｍ＾２,Ｐｓ＝４．２μｃ／ｃｍ＾２,Ｅｃ＝５．８ｋＶ／ｃｍ,０．５μｍ厚ＫＴＮ膜的Ｃｕｒｉｅ温度为３５℃;１．０ＫＨｚ时,ＫＴＮ膜的εｒ＝１４１２,估算ＫＴＮ     

磷矿石中微量砷测定的新方法

研究测定磷矿石中微量砷的新方法,以硝酸银—乙酸—聚乙烯醇（ＰＶＡ）—乙醇作为砷化氢吸收液,Ｚｎ－ＫＩ－ＳｎＣｌ２为还原体系的新银盐光度法测定砷。Ａｓ３＋质量浓度在０～７．５μｇ／５ｍｌ范围内服从Ｂｅｅｒ定律。方法回收率为９６％～１００．５％,分析含砷１．６０×１０－３％,ＲＳＤ为１．２３％,方法检出限为１．９×１０－６ｇ／Ｌ。     

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。