生物质聚氨酯泡沫研究进展

综述了以生物质替代石油基原料制备聚氨酯泡沫的研究进展,包括将植物油和松香等生物质作为羟基源与多异氰酸酯反应制备聚氨酯泡沫材料,以及将纤维素和木质素等生物质作为填充物制备聚氨酯复合泡沫。对生物质聚氨酯泡沫的发展前景进行了展望。     

聚氨酯泡沫体吸声材料的双层复合效应研究

采用二次发泡工艺制备了聚氨酯双层复合泡沫吸声材料,对其吸声性能进行了理论预测与实验验证,并探讨了复合方式对泡沫材料吸声性能的影响。结果表明,用传递矩阵法来计算聚氨酯双层复合泡沫板材的吸声系数与实验测量结果基本吻合;双层复合聚氨酯板材较单层聚氨酯泡沫的吸声性能有所提高。     

聚氨酯泡沫及其深加工产品复合面料的开发与应用

聚氨酯泡沫及其深加工产品复合面料的开发与应用邱洪根苏州吴县中联纺织材料厂（邮编２１５１０６）一、企业概况介绍：我厂是生产聚氨酯（ＰＵ）泡沫及其衍生产品的专业化生产单位，产品有ＰＵ泡沫和复合面料两大系列。８０年代中期在改革开放大潮的推动下，苏南地区涌现...     

无卤阻燃型软质聚氨酯泡沫塑料的研究进展

综述了近年来有关无卤阻燃型聚氨酯软质泡沫的研究进展,包括含磷阻燃剂、含氮阻燃剂、无机阻燃剂和复合阻燃剂。介绍了国内外阻燃型聚氨酯软质泡沫材料的最新情况;阐述了阻燃剂的阻燃方法,并对阻燃型聚氨酯软质泡沫材料的发展趋势进行了展望。     

无氟里昂聚氨酯硬质泡沫及应用

介绍了水发泡无氟里昂聚氨酯硬质泡沫的研制、工业应用以及水和ＨＣＦＣ－１４１ｂ复合发泡剂无氟里昂聚氨酯硬质泡沫在冰柜中的应用     

无卤阻燃型硬质聚氨酯泡沫塑料的研究进展

综述了近年来有关无卤阻燃型聚氨酯硬质泡沫的制备方法,包括含磷、含氮、无机和复合阻燃型泡沫。介绍了国内外阻燃型聚氨酯硬质泡沫材料的最新情况,讨论了阻燃剂的阻燃机理,并展望了阻燃型聚氨酯硬质泡沫材料的发展趋势。     

辐射接枝粉末橡胶/聚氨酯复合泡沫的制备及性能研究

首先利用辐射接枝改性方法研制了与聚氨酯相容性较好、颗粒大小为3.5~22.7μm的接枝粉末橡胶(甲基丙烯酸甲酯接枝天然橡胶,NR-MMA)。然后,将粉末橡胶作为填料加入聚氨酯发泡组分中制得复合泡沫。测试结果表明,粉末橡胶/聚氨酯复合泡沫具有比较均匀的泡孔结构和较好的声学、力学性能。     

微胶囊化相变材料对聚氨酯高回弹泡沫的影响

将密胺树脂包覆正十八烷形成的微胶囊化相变材料( MicroPCMs)引入聚氨酯软质泡沫,研究该MicroPCMs的热处理条件对聚氨酯复合泡沫制备以及其加入对泡沫结构、压缩性能、A组分体系粘度的影响.结果表明,MicroPCMs经过适当热处理后,可减小其对发泡的不利影响.MicroPCMs聚氨酯高回弹泡沫的泡孔孔径减小,...     

硬质聚氨酯泡沫复合改性研究进展

综述了微粒复合、纤维复合、混杂复合改性硬质聚氨酯(PUR-R)泡沫的最新研究进展,重点讨论了金属氧化物、碳酸钙、硅酸盐、粉煤灰、有机粉末、玻璃纤维和天然纤维复合改性PUR-R的研究现状,指出了PUR-R泡沫复合改性的研究方向。     

复合面料用软质聚氨酯泡沫的外观质量控制

<正> 1 前言复合面料最早出现在美国,目前在国内外具有很广泛的用途和广阔的潜在市场。软质聚氨酯泡沫复合面料质地柔软、手感丰满,美观、轻盈,其优异的保温性、透气性、吸音性和舒适性,更是受到用户的青睐。近年来,软质聚氨酯泡沫复合面料在我国获得了迅速发展,并已广泛应用到工业及日常生活多     

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.