反应型聚合物稳定剂的研究进展

按反应性基团的不同，该类稳定剂可分为乙烯基型；丙烯酰基型和其他类型3种类型。综述了该类稳定剂的合成和应用，还介绍了其中一些商业化的品种。     

反应型聚合物稳定剂的研究进展

研究反应型稳定剂是提高聚合物耐热性和耐萃取性的一种发展趋势。按反应性基团的不同,反应型稳定剂可分为乙烯基类、丙烯酰基和其他类型等几种。本文分别对上述几类稳定剂的合成和应用进行了概述,并详细介绍了其中的一些商业化品种。     

反应型聚合物稳定剂的研究进展

按反应性基团的不同，该类稳定剂可分为乙烯基型、丙烯酰基型和其他类型三种类型。综述了该类稳定剂的合成和应用，本文还介绍了其中一些商业化的品种。     

金属钝化剂的研究进展

塑料和聚烯烃材料爆露在空气中被氧化降解使之失去使用价值。该问题可通过添加稳定剂解决。但是当材料与金接触时，某些金属离子或金属可加速氧化反应，这会明显降低制品的使用寿命。这时应加入金属离子钝化剂，以降低聚合物的降解。本文综述了该类产品的合成与应用，还介绍了一些工业化的品种。     

反应型聚合物稳定剂的研究进展

按反应性基团的不同,该类稳定剂可分为乙烯基型;丙烯酰基型和其他类型3种类型。综述了该类稳定剂的合成和应用,还介绍了其中一些商业化的品种。     

钙锌复合稳定剂在UPVC型材中的应用研究

研究钙锌无毒复合稳定剂在PVC型材中的应用，并和传统铅盐稳定剂做了对比。结果表明：钙锌复合稳定剂为无毒稳定剂，制品的铅含量低，与铅盐稳定剂相比。生产工艺变化不大。产品能正常挤出。制品机械物理性能完全满足国标要求。     

聚丙烯的稳定化技术

本文综述了聚丙烯的稳定体系,对于热氧稳定化,首选抗氧剂1010和抗氧剂168,根据情况也可选用抗氧剂2246,对于光氧稳定化,应选用受阻胺（HALS）和苯类光稳定剂,反应型光稳定剂是值得关注的发展动向。     

热稳定剂——加速向减少危害环境成份发展

由于重金属热稳定剂(主要是镉类和铅类)存在环境污染,美国政府对制造商们施加着日益增加的压力,以迫使他们开发重金属热稳定剂的替代品。替代品占领市场只是一个时间问题。用于软制品的非镉稳定剂Wicto 集团 Argus 分公司研究与开发部门的副主任 Lawrence R.Brecker 说:“我们估计在美国已有30％～35％的含镉稳定剂为非镉稳定剂所取代。估计到1992年末,此比值将超过50％”。Argus 公司所有混合金属稳定剂产品都是非镉型的。Ferro 集团 Bedford 化学分公司继续改进其非镉稳定剂。Therm-Chek144是钡—     

甲醛法合成受阻胺光稳定剂625

本文以受阻胺光稳定剂360为主要原料，以甲醛为甲基化剂，以甲苯为溶剂，通过甲基化反应合成受阻胺光稳定剂625，产物结构经1HNMR进行了确证。通过单因素实验以及正交实验，确定了适宜的甲基化反应条件为n(360):n(甲醛)=1:4.6，反应温度为85℃，反应时间为6h。在此条件下，甲基化率为97.4%。与甲醛/甲酸法相比，该反应过程无需加入甲酸，避免了光稳定剂360与甲酸成盐结块的问题，同时避免了繁琐的后处理过程，简化了操作，降低了成本，具有甲基化率较高和产物颜色较浅等优点。     

CFC—11取代技术中泡沫稳定剂的选择

泡沫稳定剂是聚氨酯泡沫塑料是重要的助剂之一。ＣＦＣ－１１取代技术出现了一些加工和性能上的缺陷，选择合适的泡沫稳定剂能有效地改善这些缺陷，作者在总结文献的基础上提供了一个泡沫稳定剂的选择指南。     

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。