环氧树脂潜伏性体系固化反应的DSC研究

用差式扫描量热仪对ＢＰＥＡ－２／环氧树脂潜伏性固化体系的固化反应进行了分析。了固化剂的用量,固化温度,固化时间及升温速度时固化反应的热效应和固化度的影响。结果表明：ＢＰＥＡ－２潜伏性固化 用量以ｍ（环氧）：ｍ（固化剂）＝１００：９－１０）为宜。     

正丁醇钛—乙酸钡水解法合成BaTiO3粉体的研究

本文着重研究了Ｔｉ（Ｏ＾ｎＢａ）４－Ｂａ（ＤＡｃ）２水解法合成高纯超细ＢａＴｉＯ３粉体的制备工艺。借助ＴＧＤＴＡ，ＸＲＤ，ＴＥＭ，ＳＥＭ，ＳＡＸＳ和ＩＣＰ－ＡＥＳ等分析手段，研究了ＰＨ值，Ｂａ／Ｔｉ比和（Ｂａ／Ｔｉ）比，反应温度，浸泡处理等对ＢａＴｉＯ２粉体性能的影响，采用本工艺方法合成的ＢａＴｉＯ３粉体，纯度达９９．８０ｗｔ％，比表面积为６８ｍ＾２／ｇ，一次粒子平均粒径４６．７ｎｍ，二次粒子粒径     

环氧树脂潜伏性体系固化反应动力学研究

本文用差式扫描量热仪（ＤＳＣ）对ＢＰＥＡ－２／环氧树脂潜伏性固化体系的固化反应进行分析,并 分别利用Ｋｉｓｓｉｎｇｅｒ和Ａｒｒｈｅｎｉｕｓ方法求得了体系固化反应的表观活化能,利用Ｃｒａｎｅ等理论求出 了体系固化反应的反应级数及不同反应温度下的反应速率常数,’写出了固化反应的动力学方程。 结果表明：ＢＰＥＡ－２／ＣＹＤ－１２８环氧树脂潜伏性固化体系的表观活化能约为８４．１１ｋＪ／ｍｏｌ,其反应 方程式为：－ｄａ／ｄｔ＝ｋ（１－ａ）０．９６。     

环氧/异氰酸酯树脂的共固化反应研究

本文采用差示扫描量热法（ＤＳＣ）及付立叶红外光谱法（ＦＴＩＲ）等手段研究了环氧树脂与异氰酸酯共固化反应。研究发现催化剂 ２,４－ＥＭＩ对异氰酸酯的三聚反应和噁唑烷酮的生成反应均有催化作用,对噁唑烷酮的生成反应的催化尤为明显;在反应过程中,率先生成的ＰＩＳ开环与环氧基因反应生成ＰＯＸ;树脂中的Ｉ／Ｅ值在１．２～２之间才能使树脂中的官能团反应较为完善,从而有利于其各项性能的提高。     

HDPE／PC共混体系的增容剂分子设计与合成

介绍了高密度聚乙烯（ＨＤＰＥ）／聚碳酸酯（ＰＣ）共混体系的增容剂的分子设计与合成技术。采用了低密度聚乙烯（ＬＤＰＥ）在引发剂过氧化苯甲酰（ＢＰＯ）存在下与二烯丙烯双酚Ａ（ＤＡＢＰＡ）在二甲苯中进行溶液接枝共聚反应的工艺。通过重量法和Ｘ－射线光电子能谱（ＸＰＳ）证实了接枝共聚物（ＬＤＰＥ－ｇ－ＤＡＢＰＡ）的存在。研究了引发剂ＢＰＯ用量、单体ＤＡＢＰＡ用量、反应时间及反应温度对接枝率的影响,确定了合成     

2,2-二烷基-2-烷胺基苯乙酮/二芳基酮复合引发体系光聚合的加和作用

本文研究了２，２－二烷基－２－烷胺基苯乙酮（α－ＡＫ）和二芳基酮（ＤＡＫ）（包括二苯酮（ＢＰ）、米酮（ＭＫ）、二乙基蒽醌（ＥＡＱ）和硫杂蒽酮（ＴＸ））复合体系的加和作用．体系中ＤＡＫ的添加显著地改善了α－ＡＫ在近紫外光区长波段无吸收的缺陷．光聚合实验比较了ＤＡＫ的效果，其中氯代ＴＸ、ＢＰ增效作用显著，使聚合反应速度增加１．３～１．５倍，而ＭＫ和ＥＡＱ没有明显影响．同时还研究了溶剂极性、浓度和取代基的影响．结果表明，溶剂极性增加起负影响，α－ＡＫ／ＤＡＫ等摩尔浓度效果最佳和氯代ＴＸ活性高于烷基取代ＴＸ．通过吸收光谱α－ＡＫ／ＤＡＫ复合体系的加和作用机制进行了研究，结果证明三重态的能量传递敏化反应和光还原反应两种反应过程并存，它们的贡献因二芳酮不同而有差异．     

反应条件对聚噁唑烷酮合成反应的影响

研究了不同实验条件对聚唑烷酮（简称ＰＯＸ）合成反应的影响。反应产物用红外光谱跟踪检测。实验结果表明：随着反应温度的升高,生成唑烷酮环（简称ＯＸ）的选择性增大,反应介质的存在可明显改善催化剂的活性与选择性,投料比（Ｉ／Ｅ）的不同主要影响合成产物的组成,Ｉ／Ｅ值越大,ＯＸ／ＩＳ值越小。     

VO(H_2PO_4)_2热分析研究

运用ＴＧ、ＤＴＡ,研究了ＶＯ（Ｈ２ＰＯ４）２在流动空气气氛中的热反应行为、非等温反应动力学和热效应。ＶＯ（Ｈ２ＰＯ４）２从６０９Ｋ开始失重,到６９５Ｋ失重完毕,失重率为１４．０１％,失重后的产物为ＶＯ（ＰＯ３）２。运用Ｓｈａｒｐ法、Ｃｏａｔｓ－Ｒｅｄｆｅｒｎ法和Ｄｏｙｌｅ－Ｚｓａｋｏ法对基础实验数据进行分析,推断出该热分解反应机理为成核和生长（ｎ＝１）,动力学函数为Ａｖｒａｍｉ－Ｅｒｏｆｅｅｖ方程;非等温热分解反应动力学方程：ｄα／ｄＴ＝Ａ／βｅ－Ｅ／ＲＴ（１－α）;动力学补偿方程：ｌｎＡ＝０．１８１Ｅ－４．６８ｂ;热分解反应转变热为０．２９１ｋＪ·ｇ－１。     

CaO—SiO2—P2O5—H2O系统中CBC材料的溶胶—凝胶过程研究：II.凝胶的…

利用ＸＲＤ，ＩＲ，ＳＥＭ及＾２９Ｓｉ，＾３１Ｐ－ＮＭＲ等测试技术研究了ＣａＯ－ＳｉＯ２－Ｐ２Ｏ５－Ｈ２Ｏ系统中干凝胶在烧成过程中的物相变化及物相间发生的化学反应，认为凝胶在烧成过程的不同阶段发生的主要化学反应如下：（１）６７３～７７３Ｋ，由Ｃａ２Ｐ２Ｏ７和Ｃａ（ＮＯ３）２．４Ｈ２Ｏ反应生成了ＯＨＡｐ；（２）７３３～８７３Ｋ，由Ｃａ２Ｐ２Ｏ７和ＣａＯ反应生成了β－Ｃ３Ｐ；（３）８７３～９７３Ｋ；由Ｃ     

苯乙烯—丙烯酸丁酯—丙烯酸羟乙酯共聚物的合成及其与二异氰酸 …

当混合溶剂乙酸丁酯／二甲苯质量比为１：１,过氧化苯甲酰（ＢＰＯ）为１％,苯乙烯（Ｓｔ）／丙烯酸丁酯（ＢＡ）＋丙烯酸羟乙酯（ＨＥＡ）（质量比）为６２：３８,反应温度为１３３℃时,可获得卖座经率为９５．３％,「η」为０．１６ｄＬ／ｇ的Ｓｔ－ＢＡ－ＨＥＡ共聚物。该共聚物（ＨＥＡ的结合量为２－４％）在同一溶剂中加入甲苯二异氰酸酯（ＴＤＩ）或聚醚型二异氰酸酯（ＰＥＤＩ）,当一ＮＣＯ／－ＯＨ摩尔比为１．２－１     

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。