烯烃聚合非茂金属催化剂的研究进展

综述了近年来用于烯烃聚合的非茂金属催化剂的研究进展，分别介绍了非茂前过渡金属类催化剂和非茂后过渡金属类催化剂在烯烃聚合中的应用及催化性能。非茂前过渡金属催化剂具有催化活性高、聚合物结构可控和分散性好的特点，二十世纪九十年代之后已得到了快速的发展。后过渡金属催化剂(特别是Ni和Pd)由于具有独特的性能和较弱的亲氧性，能够合成高支化、具有拓扑结构的聚乙烯并且能催化烯烃与极性单体共聚。简述了α-二亚胺镍和钯催化剂在高支化聚乙烯和催化烯烃与极性单体直接共聚方面的应用，最后对非茂金属催化剂的未来发展进行了展望。     

新型后过渡金属烯烃催化剂的研究进展

综述了近年来－系列新型α－二亚胺型后过渡金属（Ni、Pd、Fe、Co）催化剂在烯烃聚合、极性单体共聚、烯烃齐聚、环烯烃加成聚合、烯烃活性聚合和聚烯烃纳米复合物等方面的最新进展。系统地阐述了不同的中心过渡金属离子、α－二亚胺骨架、骨架上的取代基和不同的聚合条件（温度、压力）分别对催化剂的聚合活性、聚烯烃支化率、聚合物分子量和分子量分布以及聚合产物的性质等影响，并且简要说明了这一类催化剂的制备方法和新特点。     

后过渡金属丙烯聚合催化剂的研究进展

综述了近年来后过渡金属催化剂用于丙烯聚合的研究进展,特别是对含有N原子配体的后过渡金属配合物的合成、结构、催化丙烯聚合的性能及存在的问题做了较详细的评述。同时介绍了对丙烯的低聚以及和其他烯烃或极性单体的共聚。     

α-二亚胺型后过渡金属配合物用于乙烯聚合的研究进展

α-二亚胺配体具有结构灵活、易合成等特点,其与后过渡金属形成的配合物具有良好的官能团容忍度,在催化乙烯的聚合及共聚的研究中得到广泛的应用,在特定结构聚乙烯的合成以及乙烯与极性单体的共聚中表现出优异的性能。总结了α-二亚胺与后过渡金属配合物的基本结构及合成方法,综述了结构与催化性能的关系以及在催化乙烯与极性单体共聚中的应用等方面的研究进展。     

水杨醛亚胺型镍金属烯烃聚合催化剂研究进展

非茂金属烯烃聚合催化剂作为新型烯烃聚合催化剂,具有配体可修饰及过渡金属可选择的优势,拓宽了烯烃聚合催化剂研究领域。综述了水杨醛亚胺型镍金属配合物催化烯烃聚合近二十年研究进展,阐述了配体上取代基电子效应、空间结构及催化乙烯聚合或烯烃共聚性能关系,分析了水杨醛亚胺型镍金属配合物催化烯烃聚合或者共聚特点,指明了此类烯烃聚合催化剂发展应用前景。     

后过渡催化剂催化烯烃与极性单体共聚的研究进展

综述了近年来后过渡金属催化剂催化烯烃与极性单体共聚的研究进展,后过渡金属催化剂催化乙烯与极性单体共聚的反应条件温和。对聚合机理和极性单体的种类进行了探讨,同时还讨论了共聚条件的变化对聚合产物的影响。     

低碳烯烃聚合催化剂的研究新进展

介绍了近来来烯烃聚合催化剂研究所取得的一些新进展,它们包括Ziegler-Natta催化剂、茂金属催化剂、非茂金属催剂、某些亚胺类后过渡金属(Ni、Pd、Fe、Co)配合物催化剂以及其它用于烯烃聚合的新型催化剂等。对世界一些主要石化公司生产PE及PP所采用的催化剂近况也作了简单表述。目前世界茂金属催化剂发展迅速,对于烯烃聚合新品种的开发具有潜在而广阔的工业应用前景和重要价值。     

低碳烯烃聚合催化剂的研究新进展

介绍了近年来烯烃聚合催化剂研究所取得的一些新进展,它们包括Ziegler-Natta催化剂、茂金属催化剂、非茂金属催剂、某些亚胺类后过渡金属(Ni、Pd、Fe、Co)配合物催化剂以及其它用于烯烃聚合的新型催化剂等。对世界一些主要石化公司生产PE及PP所采用的催化剂近况也作了简单表述。目前世界茂金属催化剂发展迅速,对于烯烃聚合新品种的开发具有潜在而广阔的工业应用前景和重要价值。     

低碳烯烃聚合催化剂的研究和发展趋势

介绍了近来来烯烃聚合催化剂研究取得的一些新进展,它们包括Ziegler-Natta催化剂、茂金属催化剂、非茂金属催剂、某些亚胺类后过渡金属(Ni、Pd、Fe、Co)配合物催化剂以及其它用于烯烃聚合的新型催化剂等。对世界一些主要石化公司生产PE及PP所采用的催化剂近况也作了简单表述。目前世界茂金属催化剂发展迅速,对于烯烃聚合新品种的开发具有潜在而广阔的工业应用前景和重要价值。     

咪唑烷-2-亚胺为配体的镍配合物催化的降冰片烯与苯乙烯共聚

为了研究[P, N]型镍催化剂的双重强供电子效应对烯烃与极性单体共聚性能的影响，本文设计合成了两种咪唑烷-2-亚胺为配体的镍配合物Ni1和Ni2,并通过核磁对其表征，研究了该类镍配合物在二氯乙基铝(EtClAl₂)助催化剂的活化下催化降冰片烯均聚及其与苯乙烯的共聚行为。结果表明，以EtClAl₂为助催化剂时，配合物Ni1催化降冰片烯均聚活性高达1.92×10⁷ g/(mol·h)。该体系配合物同样有效催化降冰片烯与苯乙烯共聚，Ni1的聚合活性高达2.14×10⁶ g/(mol·h)。该体系催化剂对降冰片烯与苯乙烯共聚表现出良好的聚合性能，从而为高效镍金属催化剂的开发提供理论依据。     

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。