国内C9石油树脂生产现状与发展研究

介绍了C9石油树脂的原料组成及C9石油树脂合成机理。对C9石油树脂的合成工艺进行了介绍,阐述了合成工艺的选择原则并对几种C9石油树脂的合成工艺进行了比较分析。重点介绍了C9石油树脂合成工艺的发展状况,指出了C9石油树脂加氢技术研发要解决的关键技术及发展方向。     

石油树脂国内外市场发展情况及分析

介绍了近几年来国内外石油树脂市场发展情况,着重分析了C5石油树脂、C9石油树脂、C5/C9石油树脂、C5脂环族树脂(DCPD)、C5加氢石油树脂的市场行情,最后在分析近几年国内C5及C9原料价格走势及影响因素的基础上指出了未来石油树脂的发展方向。     

我国C9加氢石油树脂研究进展

综述了我国C9加氢石油树脂的研究进展,重点介绍了C9加氢石油树脂催化剂研究、浆态加氢工艺、固定床加氢工艺及C9加氢石油树脂的应用,指出了我国C9加氢石油树脂今后的研究方向。     

苯乙烯馏分加入量对合成C9石油树脂性能影响的研究

介绍了C9石油树脂的主要特性，阐述C9石油树脂的工艺过程，指出C9石油树脂的综合利用的用途和发展方向。     

C9石油树脂加氢技术研究进展及应用市场

分析了C9石油树脂加氢技术及其相关催化剂的研究进展和专利申请情况,并分析了C9加氢石油树脂的用途及其市场消费状况,指出了C9加氢石油树脂是C9资源利用的一个有效途径。     

两种石油树脂对再生胶性能影响的研究

研究了C5石油树脂和C9石油树脂用量对再生胶性能的影响。结果表明,加入C9石油树脂的再生胶具有较短正硫化时间、较低门尼粘度和较高拉断伸长率。当C9石油树脂用量为3~5份时,再生胶具有较好综合性能。     

C_9石油树脂的研究进展

介绍了C9石油树脂的生产方法和改性方法,并对改性机理进行了探讨。阐述了国内外C9石油树脂的生产状况及产品类型,对C9石油树脂的应用前景进行了展望。     

PE-C9石油树脂改性沥青的研制

实验考察了PE对C9石油树脂改性沥青针入度、软化点以及黏度的影响,并对PE-C9石油树脂改性沥青的老化以及储存稳定性进行分析,采用四组分法对改性机理进行探讨,并利用扫描电镜进行表征。结果表明,当PE与C9石油树脂的质量比为2.1时,改性沥青的针入度,软化点以及黏度均满足要求,同时老化性能和高温储存性能变好。通过四组分的分析可知,C9石油树脂可增加改性沥青体系芳香分的含量,促进PE在C9石油树脂改性沥青中的溶胀和吸附作用,通过电镜观察,当PE与C9石油树脂的质量比为2.1时,PE、C9石油树脂、基质沥青三者形成了稳定的网状结构。     

C_9石油树脂的生产工艺及其应用

本文从C9原料预处理、聚合反应,水洗及闪蒸过程中各种工艺过程阐述了C9石油树脂的催化生产工艺,讨论了各工艺环节对石油树脂产品质量的影响,并介绍C9石油树脂在橡胶、涂料、油墨、油漆等行业中的应用。     

C9石油树脂的研究现状

裂解C9资源的深加工不仅可以有效利用石油资源、延伸产业链,而且也是企业改善产品结构、增加经济效益的重要途径.石油树脂的发展进入了技术竞争的时代,结合相关技术进展,对C9石油树脂的原料及合成方法进行了总结,综述了C9石油树脂应用方向及其改性研究,旨在提高产品的性能和拓宽产品的应用范围,展望C9石油树脂研发方向和应用前景.     

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.     

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.     

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.     

Novel polyurethane coating technology through glycidyl carbamate chemistry

Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.