胺对镍系催化了二烯聚合规律的影响

以二乙胺为例研究了胺对Ｎｉ（ｎａｐｈ）２－Ａｌ（－Ｂｕ）３－ＢＦ３·ＯＥｔ２＋ｎ—Ｃ８Ｈ１７ＯＨ（简称Ｎｉ－Ａｌ－Ｂ＋ＲＯＨ）和Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ－Ｂｕ）３－ＢＦ３·ＯＥｔ２＋ＣＨ３ＣＯＯＣ４Ｈ９（简称Ｎｉ—Ａｌ—Ｂ＋ＢＡ）两体系聚合活性和聚合物分子量的影响，并与Ｎｉ—Ａｌ—Ｂ体系进行了对比．考察了通常条件下肢的允许含量，讨论了有胺存在时Ｎｉ／Ｂｄ、Ａｌ／Ｎｉ、Ａｌ／Ｂ摩尔比的变化对聚合规律的影响。结果表明：胺的含量高于２０ｐｐｍ时将使聚合活性和分子量降低，提高催化剂用量可以抑制胺的不利影响。     

Ni（naph）2—Al（i—Bu）3—BF3.OEt2—ROR‘体系催化丁二烯聚合

研究了Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ－Ｂｕ）３－ＢＦ３．ＯＥｔ２－ＲＯＲ’体系催化丁二烯聚合的特点,考察了Ａｌ／Ｂ摩尔比,Ａｌ／Ｎｉ摩尔比,Ｎｉ／Ｂｄ摩尔比,ＲＯＲ’／Ｂ摩尔比等反应条件对聚合活性及聚合产物分子量的影响,还考察了该体系的凝胶含量,实验结果表明,该体系中醚的加入不仅保持体系较高的聚合活性,较好的地控制聚合物分子量,而且还能降低体系的凝胶含量,Ａｌ／Ｂ比的变化对聚合物活性及聚合物分子量的     

镍催化体系合成低分子聚丁二烯

研究了Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ－Ｂｕ）３－ＢＦ３·ＯＥｔ２－Ｃ８Ｈ１７ＯＨ体系合成低分子聚丁二烯,考察了Ａｌ／Ｂ摩尔比、Ａｌ／Ｎｉ摩尔比、Ｎｉ／Ｂｄ摩尔比、Ｃ８Ｈ１７ＯＨ／Ｂ摩尔比等反应条件对聚合活性及聚合产物分子量的影响。实验结果表明,该体系在Ａｌ／Ｂ比于０１５～０３０之间时,随着Ａｌ／Ｂ比的降低,聚合活性下降,聚合物分子量也降低。由于辛醇的作用,聚丁二烯的特性粘数最低可降至０５ｄＬ／ｇ。Ａｌ／Ｂ比的变化对聚合活性及聚合物分子量的影响显著,Ａｌ／Ｂｄ比、Ｎｉ／Ｂｄ比、Ｃ８Ｈ１７ＯＨ／Ｂ比对其影响不大     

Ni(naph)_2—Al(i-Bu)_3—BF_3·OEt_2—ROR′体系催化丁二烯聚合

研究了Ｎｉ（ｎａｐｈ）２—Ａｌ（ｉ－Ｂｕ）３—ＢＦ３·ＯＥｔ２—ＲＯＲ′体系催化丁二烯聚合的特点,考察了Ａｌ／Ｂ摩尔比、Ａｌ／Ｎｉ摩尔比、Ｎｉ／Ｂｄ摩尔比、ＲＯＲ′／Ｂ摩尔比等反应条件对聚合活性及聚合产物分子量的影响,还考察了该体系的凝胶含量。实验结果表明,该体系中醚的加入不仅保持体系较高的聚合活性,较好地控制聚合物分子量,而且还能降低体系的凝胶含量。Ａｌ／Ｂ比的变化对聚合活性及聚合物分子量的影响显著,Ａｌ／Ｎｉ比、Ｎｉ／Ｂｄ比、ＲＯＲ′／Ｂ比对其影响不大。     

镍系催化十二烯聚合

我国镍系顺丁橡胶（ＢＲ）生产采用以加氢汽油为溶剂的Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ－Ｂｕ）３－ＢＦ３．ＯＥｔ２（简称Ｎｉ－Ａｌ－Ｂ）催化体系。聚合活性与Ａｌ／Ｂ（摩尔比）密切相关，Ａｌ／Ｂ值又是调节ＢＲ分子量的关键参数。催化活性中心上镍的价态分别为Ｎｉ（０）和Ｎｉ（Ｉ），聚合反应的表观活化能为Ｅａ［Ｎｉ（０）＜Ｅａ［Ｎｉ（Ｉ）］。ＡｌＲ２Ｆ也是组成活性中心配合物的结构单元。催化活性表现有低温聚合依时性     

镍系催化丁二烯聚合

我国镍系顺丁橡胶（ＢＲ）生产采用以加氢汽油为溶剂的Ｎｉ（ｎａｐｈ）＿２－Ａｌ（ｉ－Ｂｕ）＿３－ＢＦ＿３·ＯＥｔ＿２（简称Ｎｉ－Ａｌ－Ｂ）催化体系。聚合活性与Ａｌ／Ｂ（摩尔比）密切相关，Ａｌ／Ｂ值又是调节ＢＲ分子量的关键参数。催化活性中心上镍的价态分别为Ｎ１（０）和Ｎｉ（Ｉ），聚合反应的表观活化能为Ｅ＿ａ［Ｎｉ（０）］＜Ｅ＿ａ［Ｎｉ（Ｉ）］。ＡｌＲ＿２Ｆ也是组成活性中心配合物的结构单元。催化活性表现有低温聚合依时性的稳定性和高温聚合依时性的不稳定性的规律。体系中添加醇、酯类可拓宽Ａｌ／Ｂ值的调节范围，制得５的ＢＲ，其１，４含量高于９６％。     

Ni（naph）2—Al（i—Bu）3—（BF3.OEt2＋C8H17OH＋MeCOOBu）体系催化丁二…

探讨了正辛醇／乙酸丁酯混合溶剂对ＢＦ３．ＯＥｔ２在加氢汽泡中的增溶情况，考察了Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ－Ｂｕ）３－（ＢＦ３．ＯＥｔ２＋正辛醇＋乙酸乙酯）体系催化下二烯聚合活性和水对该体系聚合活性，聚合物特性粘数，聚合速率，微观结构和相地分子质量的影响，结果表明，该混合溶剂是ＢＦ３．ＯＥｔ２的良好增溶剂，当Ｈ２Ｏ／Ａｌ（摩尔比）≤２．３时，用其增溶的催化体系聚合活性高，可制得门尼龙粘度高，相对分     

钼系高乙烯基聚丁二烯橡胶的合成

通过１００ｍＬ聚合瓶小试及５０Ｌ四釜连续聚合中试,考察了以ＭｏＣｌ３（ＯＲ）２－（ｉ－Ｂｕ）２Ａｌ（ｍ－ＯＰｈＭｅ）（简称Ｍｏ－Ａｌ）构成的Ｚｉｅｇｌｅｒ－Ｎａｔｔａ催化体系合成钼系高乙烯基聚丁二烯橡胶（ＨＶＢＲ）的试验情况。在５０Ｌ装置上连续生产出乙烯基含量为８０％的ＨＶＢＲ。研究了ＨＶＢＲ的生产工艺条件,在Ａｌ／Ｍｌ（摩尔,下同）为１５－３５,Ｍｏ／Ｂｄ（摩尔比,下同）为（６－８）＊１０＾－５     

Ni(naph)_2-Al(i-Bu)_3-(BF_3·OEt_2+C_8H_(17)OH+MeCOOBu)体系催化丁二烯聚合

探讨了正辛醇／乙酸丁酯混合溶剂对ＢＦ３·ＯＥｔ２在加氢汽油中的增溶情况，考察了Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ－Ｂｕ）３－（ＢＦ３·ＯＥｔ２＋正辛醇＋乙酸丁酯）体系催化丁二烯聚合活性和水对该体系聚合活性、聚合物特性粘数、聚合速率、微观结构和相对分子质量的影响。结果表明，该混合溶剂是ＢＦ３·ＯＥｔ２的良好增溶剂。当Ｈ２Ｏ／Ａｌ（摩尔比）≤２．３时，用其增溶的催化体系聚合活性高，可制得门尼粘度高、相对分子质量分布宽、顺－１，４结构含量大于９６％的聚丁二烯。     

镧系金属化合物催化苯乙烯和双烯烃的共聚：苯乙烯和异戊二烯…

采用稀土催化体系Ｎｄ（Ｆ３ＣＯ２）３－ＢｒＣ５Ｈ１１－ＲｍＡｌＨ３－ｍ（Ｎｄ－Ｂｒ－Ａｌ），以甲苯为溶剂，在５０℃恒温水浴中进行苯乙烯和异戊二烯共聚合。结果表明，由Ａｌ（Ｏｃｔ）３或Ａｌ（ｉ－Ｂｕ）３组成的催化体系可制备以顺式－１，４结构为主的共聚物，在后者组成的催化体系中，当Ａｌ／Ｎｄ＝５（摩尔比，下同），Ｂｒ／Ｎｄ＝５时，聚合活性最高。经ＩＲ，ＮＭＲ检测表征了共聚物微观结构。同时，用π－烯丙基     

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。