裂解肽—Wang树脂的新试剂

用０．５ｍｏｌ／Ｌ二氯二甲基硅烷（ＤＤＳｉ）－１．５ｍｏｌ／Ｌ苯酚／ＣＤＭ－ＨＯＡｃ（１：１）溶液代替经典的８５％三氟醋酸（ＴＦＡ）／Ｈ２Ｏ溶液对肽－Ｗａｎｇ树脂进行酸解释放游离肽反应。测定了裂解前后树脂上肽的取代度并分析了游离肽产物的氨基酸组成，证明裂解收率及产物纯度与ＴＦＡ法相同。ＤＤＳｉ法的成本仅相当于ＴＦＡ法的４．３％。     

裂解肽－Wang树脂的新试剂

用０．５ｍｏｌ／Ｌ二氯二甲基硅烷（ＤＤｓｉ）－１．５ｍｏｌ／Ｌ苯酚／ＣＤＭ－ＨＯＡｃ（１：１）溶液代替经典的８５％三氟醋酸（ＴＦＡ）／Ｈ２Ｏ溶液对肽－Ｗａｎｇ树脂进行酸解释放游离肽反应。测定了裂解前后树脂上肽的取代度并分析了游离肽产物的氨基酸组成，证明裂解收率及产物纯度与ＴＦＡ法相同。ＤＤＳｉ法的成本仅相当于ＴＦＡ法的４．３％。     

丙烯酸乳液聚合物裂解色谱／质谱研究

采用裂解色谱／质谱－计算机联用技术，对聚丙烯酸丁酯，丙烯酸丁酯／苯乙烯共聚物，丙烯酸丁酯／醋酸乙烯共聚物三种乳液聚合物的热裂解产物进行了分析，其特征裂解碎片被检测，质谱定性一可靠。结果表明，由于三种聚合物的组成和结构不同，其裂解机理亦不相同。ＰＢＡ，ＰＢＡ／Ｓｔ以解聚机理裂解，其主要特征裂解产物是聚合单体；而ＰＢＡ／ＶＡ以断袭机理裂解，主要特征解产物为醋酸，苯，苯甲酸丁酯等，裂解产物中的二，三...     

聚氨酯树脂的色谱／质谱分析

本文介绍了聚酯型聚氨酯树脂的定性分析方法。树脂样品用混合酸酐回流,裂解成为相应的多元胺、多元酸和多元醇。多元醇衍生为乙酸酯,多元酸以ＢＳＴＦＡ衍生为相应的三甲基硅酯,用毛细管色谱／质谱（ＧＣ／ＭＳ）分析裂解产物及其衍生物,以确定聚氨酯树脂的组成。     

SiO2-AlN复合材料的制备及其性能研究

热压烧结制备了ＳｉＯ２－ＡｌＮ复合材料,研究了第二相ＡｌＮ的引入量和热压温度对ＳｉＯ２－ＡｌＮ复合材料力学性能、介电性能和热学的影响,结果说明,第二相ＡｌＮ的引入有利于ＳｉＯ２基复合材料力学性能的提高;３０％（体积分数）ＡｌＮ－ＳｉＯ２复合材料于１４００℃下烧结后抗弯强度和断裂韧性２００ＭＰａ和２．９６ＭＰａ·ｍ＾１／２,ＸＲＤ分析证实直至１４００℃ＡｌＮＳｉＯ２间未发生反应,两者有良好的化学相容     

用不同粘土矿物合成Sialon粉末的研究

本文以高岭土、蒙脱石、叶腊石为原料，将粘土矿物与碳混合，加入适量的添加剂，在Ｎ２气氛１４００°Ｃ下，经４ｈ碳热还原氮化合成Ｓｉａｌｏｎ，产物经ＸＲＤ、ＸＰＳ、ＥＰＭＡ等分析，结果表明：用不同粘土矿物合成Ｓｉａｌｏｎ，矿物的Ａｌ／Ｓｉ比与碳的含量直接影响最终的合成产物，但主晶相仍为Ｚ＝３的β′－Ｓｉａｌｏｎ。     

300℃蒸压反应形成的水化硅酸钾

在３００℃Ｍｏｒｅｙ蒸压弹中，使不同硅质试剂与ＫＯＨ、Ｈ２Ｏ反应，反应产物为ＫＳ４Ｈ、ＫＳ４Ｈ（Ⅰ）、ＫＳ２Ｈ和石英。形成的产物种类与反应混合物的ＳｉＯ２／Ｋ２Ｏ克分子比、蒸压弹中的水量和初始试剂种类有关。文中给了三种硅酸钾水化物的ＤＴＡ／ＴＧＡ曲线，Ｘ射线粉末衍射数据和分析电镜照片，绘制了蒸压产物形成区域图，还讨论了水化硅酸钾的形成条件和稳定性，以及实始硅质试剂的反应活性。     

Lanxide^TM法制备SICp／Al复合材料

Ｌａｎｘｉｄｅ＾ＴＭ技术是制备铝基复合材料的一种新方法,适于制备低孔隙率的ＭＭＣ。本文对利用该技术制备ＳｉＣｐ／Ａｌ复合材料进行了综述,阐述了Ａｌ对ＳＩｃＰ的润湿、渗透及界面反应等问题,并介绍了增强ＳｉＣｐ／Ａｌ的润湿、渗透及控制界面反应的方法。     

溶胶—凝胶法全成SiC—AlN复合超细粉末的机理研究

本文通过对热力学过程动力学过程的研究，探讨了ＳｉＣ－ＡｌＮ复合细粉末的合成机理，由于Ａｌ４ＳｉＣ４产物的出现，反映了合成的非单一化。通过ＸＲＤ分析，研究了ＳｉＣ－ＡｌＮ粉末合成反应历程，并指出ＡｌＮ的生成比ＳｉＣ生成滞后５０－１００℃，从自由能和反应常数作了理论上的分析。通过对合成过程中转化率的测定和颗粒形貌的观察，探讨反应动力学过程，说明了系统中晶核和晶体大长机制。最后，本文分析了粉末中晶须产生     

AlN／SiCw（Y2O3＋SiO2）复合材料热处理增强研究

研究了热处理对ＡｌＮ／ＳｉＣｗ（Ｙ２Ｏ３＋ＳｉＯ２）复合材料机械性能的影响。结果表明，该材料经热处理后的强度提高，当添加剂Ｙ２Ｏ３／ＳｉＯ２＝１／２．５摩尔比时，提高幅度最大。经ＸＲＤ，ＳＥＭ，ＴＥＭ／ＥＤＡＸ和ＨＲＥＭ分析，热处理增强的机理主要是粒界玻璃相在高温氧化气氛中和ＡｌＮ颗粒表层作用，生成的纤维２Ｈ＾δＳｉａｌｏｎ相和ＳｉＣｗ形成空间交错结构。     

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.     

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。     

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.