~mB对气相色谱保留指数的QSPR研究

在邻接矩阵的基础上 ,建立一种新的连接性指数 mB :mB =∑ (δi·δj·δk… ) 0 .5,其中 :0 B =∑ (δi) 0 .5,1B =∑ (δi·δj) 0 .5,并计算出 114个分子的0 B、1B值。发现 mB与这些化合物的气相色谱保留指数RI有很好的相关性。烷烃的线性回归方程为 :RI=2 5 .6 0 73+83.85 6 10 B - 9.2 784 1B ,相关系数R =0 .996 3;醇的线性回归方程为 :RI=2 7 0 138+130 .0 2 2 90 B - 4 1.0 4 86 1B ,相关系数R =0 .9976 ;取代苯的线性回归方程为 :RI =- 5 .0 889+2 2 .4 5 75 0 B - 2 4 .0 986 1B ,相关系数R =0 .992 8;分子连接性指数能较好地反映化合物的结构特征     

一种新的连接性指数与卤化物热力学性质的相关性

定义原子特征值fi=Δ xpi×mi/ni,并考虑氢对分子结构和性质的贡献 ,修正为fi=Δ xpi×mi/ni+hi0 .5。在邻接矩阵基础上建构新的连接性指数 mY =∑ (fi×fj×fk… ) 0 .5,其中 0阶指数0 Y =∑fi0 .5,1阶指数1Y =∑ (fi×fj) 0 .5。用1Y分别相关了 16个硅卤化物 (不含氢 )、32种硅卤化物 (含氢 )、32个硅卤化物、16个钛卤化物、32个硅卤化物和钛卤化物 (不含氢 )、48个硅卤化物 (含氢 )和钛卤化物的标准生成焓 ,它们的相关系数均在 0 985以上 ,优于文献 [1],另外 ,0 Y和 40个卤代甲烷的标准生成焓和标准生成自由能也具有良好的相关性 ,r分别为 0 9948,0 9947     

取代苯甲酸的生物降解性与拓扑相关性研究

基于表征生物降解性的原子点价(gi)构建新的自相关拓扑指数(mG),其中的1G不仅对取代芳烃呈现良好的结构选择性,而且与10种取代苯甲酸一级生物降解速率常数(-lgK)显著相关:-lgK=0.591 6 0.005 01G,R2=0.966 4。引入0G:-lgK=0.773 8-0.008 30G 0.006 31G,R2=0.977 5。结果表明,该方法具有物理意义明确,计算简单等优点。     

硝基苯类化合物对生物急性毒性的自相关拓扑研究

提出成键原子(i)的生物活性特征值(Ai),在分子图的邻接矩阵基础上,建立蕴含有机物生物活性因素的生物活性特征自相关拓扑指数mY,其中0阶指数0Y=∑Ai,1阶指数1Y=∑Ai·Aj。用1Y、指示变量(I)、距离指数(L)与35个硝基苯类化合物对黑呆头鱼的急性毒性(-lgLC50)关联,相关系数为0.9310,优于相应文献的研究结果。     

我国SBR生产近况

目前 ,我国SBR生产装置共有 6套 ,总的生产能力为 42 .5万t·a- 1 。其中E SBR生产能力为 36.5万t·a- 1 ,生产厂家为中国石化齐鲁石化公司 ( 1 3万t·a- 1 )、申华化学工业有限公司 ( 1 0万t·a- 1 )、中国石化吉林石化公司 ( 9万t·a- 1 )、中国石化兰州化学工业公司 ( 4 .5万t·a- 1 ) ;S SBR年生产能力为 6万t·a- 1 ,生产厂家有中国石化北京燕山石化公司 ( 3万t·a- 1 )和茂名石化公司 ( 3万t·a- 1 )。如果2 0 0 5年上海漕泾的中国石化 旭化成 1 0万t·a- 1 的SBR项目能够正常投产 ,届时我国SBR总的生产能力将达到 5 2 .5万t…     

我国丁苯胶乳生产能力

目前 ,我国丁苯胶乳生产装置共有 1 0套 ,总生产能力达到 2 8万t·a- 1 。主要生产厂家包括高桥 巴斯夫公司 ( 1 6万t·a- 1 )、美国陶氏丁苯胶乳 (张家港 )有限公司 ( 4 .5万t·a- 1 )、中国石化兰州化学工业公司 ( 1 .2万t·a- 1 )、淄博齐翔工贸有限责任公司 ( 1万t·a- 1 )、上海兰德助剂厂 ( 1万t·a- 1 ,道路沥青用丁苯胶乳 )、高桥化工厂 ( 1万t·a- 1 ,原SBR生产装置改建 )、中国石化齐鲁石油化工股份有限公司 ( 1万t·a- 1 )、中国石化北京燕山石油化工股份有限公司( 5 0 0 0t·a- 1 )、山东淄博合力化工有限公司( 5 0 0 0t·a- …     

国内外消息

39届国际化纤会议2 0 0 0年 9月 1 3-1 5在奥地利多恩伯恩召开的第 39届国际化纤会议主要内容如下 :-千年之交的化学纤维与纺织工业·产业用聚合物研究趋势 (德国 ,巴斯夫公司 ,H.U.Schenck)·从工程角度看千年之交的化学纤维工业 (德国 ,卢奇吉马公司 ,M.G.Martl)·纱线及纺织织物生产的未来趋势 (德国 ,ITA公司 ,B.Wnlfhorst)·千年之交的天然纤维的生产 (德国 ,FH Reutlingen公司 ,A.Schenek)·美国生产的纤维及纺织业 :综述与展望 (美国 ,AFMA,P.O Day)·中国化纤及纺织业——伟大的过去 ,光明的未来 (中国 ,国家纺工局 ,季国…     

二安替比林对氯苯基甲烷与钒的显色反应研究

以正交设计法试验研究了二安替比林对氯苯基甲烷试剂分光光度法测定微量钒的最佳显色条件。最佳显色条件为 :(1+5 ) H3PO4 用量为 4 .0 0 m L,0 .2 m ol· L- 1 Mn( )的用量为 2 .0 0 m L,10 g· L- 1 Tween80用量为 2 .0 0 m L ,2 g· L- 1 DAPCM用量为 3.0 0 m L ,加热温度为 90℃ ,加热时间为 5 5 m in,最大吸收波长为 4 85 nm。V( )在 0 .2 0～ 5 .0 0 μg· (2 5 m L) - 1范围内呈良好线性关系 ,线性回归方程为 A=0 .92 11+0 .35 14 C[μg· (2 5m L) - 1 ],线性相关系数 r=0 .9979,摩尔吸光系数 ε=1.0 3× 10 6 [L· (mol· cm) - 1 ]。本法应用于猪骨中钒 ( )的测定 ,结果满意     

橡胶加工专利

一、轮胎燃料成本低、耐磨性能高的轮胎胶料Jpn. kokai Tokkyo Koho JP 2 0 0 12 4 7,718(Cl.C0 8L 9/0 0 )此胶料含 10 0份天然橡胶和 /或二烯类橡胶、5～ 10 0份Si O2 、2 %～ 2 0 % (以 10 0份 Si O2 为计量单位 )硅烷偶联剂以及1%～ 2 0 %钠盐。由 SBR 15 0 2 10 0份、Si O 5 5份、Si 6 94 .4份、Na2 HPO4· 12 H2 O、4份和 S1.5份组成的胶料经硫化后制得成品 ,胶料门尼粘度 5 7.7,与不含 Na2 HPO4· 12 H2 O的制品相比 ,它的耐磨指数、滚动阻力指数和抗湿滑性分别高出 4 % ,6 %和 5 %。高速行驶和重型车辆用抗崩花充气轮…     

催化动力学光度法测定痕量钒(Ⅴ)的研究

研究了在 p H=4及没食子酸存在下 ,微量钒 ( )催化溴酸钾氧化邻苯二胺的动力学条件 ,建立了催化动力学光度法测定痕量钒 ( )的新方法。方法的测定范围为 0～ 0 .0 2 5 μg· 2 5 m L- 1 ,检出限为 1.18× 10 - 6 g·L- 1 ,相对标准偏差为 4 .6 3% (n=10 ) ,线性回归方程为△ A=2 5 .6 6 c(μg· 2 5 m L- 1 ) - 0 .0 15 7(r=0 .9997) ,表观摩尔吸光系数ε4 6 0 nm=3.2 7× 10 7L· m ol- 1 · cm- 1 。该法灵敏度高 ,选择性好 ,直接应用于水样和食品样中痕量钒( )的测定 ,结果满意     

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。