配合剂对丁腈橡胶低温性能的影响

研究了不同硫化体系、不同增塑剂及其用量对丁腈橡胶硫化胶低温弹性的影响。结果表明,丁腈橡胶低温弹性改善效果的大小顺序为：过氧化物硫化体系〉混合硫化体系〉有效硫化体系;当增塑剂DOS与DBS用量达到一定值,并按某一范围配比量使用时,丁腈橡胶胶料低温弹性有较大改善,超越了任一增塑剂单用时的效果;降低了增塑剂和炭黑总用量,胶料低温弹性明显变差。     

丁腈橡胶的并用改性及应用进展

综述了近年来丁腈橡胶的发展概况和未来的应用前景,介绍了丁腈橡胶的基本特性及不足。为提高丁腈橡胶及其制品的通用性能,国内外对丁腈橡胶的并用改性进行了大量研究,对丁腈橡胶与不同橡胶或树脂的并用胶的综合性能进行了详细阐述。从胶料选取、并用比、硫化体系、补强剂、增塑剂、其他助剂的选择及基本工艺等方面对丁腈橡胶的并用改性进行了综述。改性后,并用胶的综合性能得到了极大提高,改善了丁腈橡胶制品的性能,使其适应更苛刻的环境,具有广阔的应用前景。     

配合剂用量对丁腈橡胶耐油性的影响

在生胶及配方成份不变的情况下,分别研究了增塑剂DOS、补强剂及硫化剂DCP用量对丁腈橡胶耐油性的影响,并对其影响机理进行了探讨。研究表明,随着增塑剂DOS、补强剂及硫化剂用量的增加,丁腈橡胶在燃油B、3#标准油及4050滑油中体积变化率均减小,耐介质性能提高,其中增塑剂DOS的用量对提高丁腈橡胶的耐油性效果最为显著。同时本文还对比了丁腈橡胶与氟橡胶、氟硅橡胶在燃油B、1#标准油、3#标准油及4050滑油中体积变化率及物理机械性能的变化率,得出了3种橡胶对4种介质的抗溶胀能力结果。     

日本瑞翁公司氢化丁腈橡胶的性能及应用介绍

介绍了日本瑞翁公司氢化丁腈橡胶的主要牌号及性能指标、主要特性（包括耐油性、耐热性、耐寒性、耐磨性、耐介质性能等）及应用领域。阐述了氢化丁腈橡胶的配合原则，如硫化体系、补强体系、增塑剂及防老剂的选择等。列出了４个实例配方及性能。     

彩色丁腈橡胶护套配方的研究

本文研究了彩色丁腈橡胶护套配方。包括丁腈橡胶的特性、硫化体系、增塑剂、防老剂、补强剂、新型的EM工程材料以及着色剂的选抒。     

耐油耐低温丁腈橡胶的研制

该文以兰化NBR1704为主体材料,采用增塑剂DOA、DOS并用,通过调整炭黑与增塑剂用量,最终获得了邵尔硬度在77度左右的耐油耐低温丁腈橡胶。     

丁腈橡胶耐热空气老化因素的对比研究

研究了补强剂、增塑剂和防老剂对丁腈橡胶耐热空气老化性能的影响。结果表明,采用低补强炭黑N774、炭黑N990与甲基丙烯酸镁或甲基丙烯酸锌(SR634)配合可以提高丁腈橡胶耐热空气老化性能;分别加入耐高温增塑剂TP-759、耐高温防老剂445和耐高温防老剂KY405能明显提高丁腈橡胶耐热空气老化性能;采用沉淀法白炭黑与甲基丙烯酸锌配合时,可以提高胶料耐热空气老化性能,但会明显降低胶料弹性。     

SnO催化合成环烷酸乙二醇酯增塑剂的研究

本文介绍了以SnO非酸催化剂催化合成环烷酸乙二醇酯增塑剂NAEP，的实验方法，给出了适宜的工艺条件，并对NAEP应用于聚氯乙烯塑料和丁腈橡胶中的情况作了介绍。     

大宝兰山公司丁腈橡胶试验报告

本文叙述了对加拿大宝兰山公司提供的四位数系列,820系列标准品级丁腈橡胶,NBR/PVC共混胶、羧基丁腈橡胶、部分交联丁腈橡胶等特殊品级,两种防老剂、一种增塑剂、一种白炭黑样品的试验结果。     

丁腈橡胶改性聚氯乙烯软质泡沫塑料的研究（一）

本文利用正交设计法,研究了丁腈橡胶改性聚氯乙烯软质泡沫塑料的最佳配方和工艺条件,主要考察了丁腈橡胶、增塑剂、发泡剂、硫化剂、促进剂、温度和时间对泡沫塑料性能的影响。     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

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.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009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、环氧树脂、不饱和聚酯树脂)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。     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

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.