聚酰亚胺/环氧树脂共混胶粘剂的热性能分析

利用热重法研究了聚酰亚胺（ＰＩ）／环氧树脂（Ｅ－５１）共混胶粘剂的耐热性。结果表明,共混胶粘剂体系中,热降解峰温度范围是２５０￣４００℃,当余重为５０％时,温度介于４４０￣６００℃之间。通过比较缩合型ＰＩ和加成型ＰＩ对环氧树脂耐热性的改善效果,发现自制的聚酰胺酸（ＰＡＡ）的改性效果要比双马来酰亚胺（ＢＭＩ）好。     

环氧树脂胶粘剂的丙烯酸丁酯增韧研究

利用丙烯酸丁酯（nBA）以IPN（互穿网络法）增韧环氧树脂胶粘剂,分别通过SEM（扫描电镜）、DMA（动态粘弹谱）和TG（热重法）等方法对所合成的改性胶粘剂作了分析研究。结果如下：两种IPN体系的SEM照片说明,IPN方法可以增韧环氧树脂,并且丙烯酸丁酯含量为10％时,IPN体系的相容性较好;通过DMA分别测得两种IPN体系中环氧树脂的疋（玻璃化转变温度）,发现它们均不同程度地发生内移,表明IPN法可以增加环氧树脂与聚丙烯酸丁酯的相容性;两种IPN体系的TG曲线说明,IPN体系中环氧树脂的初始分解温度提高,并且在失重百分比相同的情况下,IPN体系的温度高于纯环氧树脂体系,同时IPN体系的完全分解温度提高。由此可见,IPN体系中在热稳定性方面环氧树脂与聚丙烯酸丁酯可以发挥明显的协同效应,从而提高了环氧树脂的耐热性能。     

新型含砜环氧胶粘剂的研制

研究了主要成分为双酚S环氧树脂、E-51环氧树脂和SRTEM-80环氧树脂的环氧胶粘剂体系，通过改变胶粘剂体系中双酚S环氧树脂、E-51环氧树脂和SRTEM-80环氧树脂的比例，经过一系列化学反应，制备得到SJ-1、SJ-2、SJ-3、SJ-4和SJ-5等含砜的环氧胶粘剂体系。对其黏度性能、凝胶化时间、表观活化能、力学性能、电学性能、吸水性能等进行了系统研究，优化了配方及制备工艺。研究结果表明：双酚S环氧树脂和SRTEM-80环氧树脂中有较多的活性基团，可使胶粘剂体系的交联反应活性增加，交联速度加快，导致胶粘剂体系的凝胶化时间变短；5种胶粘剂的力学性能、电学性能和疏水性都较好，并且SJ-3胶粘剂的各项性能比其他配方均要优异；SJ-3胶粘剂固化后拉伸强度为32.3 MPa，电容为5.94～5.98 pF，介电损耗为0.37%～0.51%，吸水率仅为0.16%，是较合理的配方，有较大的应用前景。     

新型含砜环氧树脂胶粘剂的研制

采用热塑性含羧基聚合物（PDTD），对由含砜低聚物（BPA21）、环氧树脂、多功能环氧树脂制得的无溶剂胶粘剂体系进行改性。对改性胶粘剂的性能进行了测试分析，并探索了PDTD添加比例对环氧胶粘剂体系性能的影响。研究结果表明：加入PDTD的胶粘剂体系反应活性提高，且m（环氧树脂）∶m(PDTD)=100∶10时，反应速率最快，其保存时需要与固化剂分开保存；随着增韧剂比例的增加，胶粘剂体系黏度增加，成正相关关系，为便于涂覆，需控制其添加量；当m（环氧树脂）∶m(PDTD)=100∶10时，环氧树脂胶粘剂体系的拉伸剪切强度取得最高值10.74 MPa，比未加时提高了29%，充分达到了增韧的效果；添加PDTD会使得环氧树脂胶粘剂的介电性能有轻微下降，但是5种含不同比例增韧剂的胶粘剂都表现出良好的介电性能；5种含不同比例PDTD的胶粘剂吸水率都极低，拥有良好的疏水能力，其中当m（环氧树脂）∶m(PDTD)=100∶10和100∶8时，吸水率最低，适用于潮湿环境的保存和使用。综上所述，当m（环氧树脂）∶m(PDTD)=100∶10时，环氧树脂胶粘剂的黏度比较适中，体系反应活性较高，可较快固化，且拥有...     

耐高温环氧树脂胶粘剂研究进展

介绍了近年来耐热环氧树脂胶粘剂的研究概况 ,讨论了影响环氧树脂胶粘剂耐热性的因素 ,并指出了耐热环氧树脂胶粘剂的研究发展方向。     

环氧胶粘剂增韧改性研究进展

回顾了关于近些年环氧树脂及环氧胶粘剂增韧的研究进展情况，比较系统地介绍了环氧树脂增韧的方法及相关增韧机理，并在此基础上总结了环氧胶粘剂的增韧方法，指出了今后环氧胶粘剂增韧改性研究方向。     

水性环氧树脂包覆有机蒙脱土制备木材胶粘剂

摘要：水性环氧树脂通常含有水溶性分子或分子链，导致在高温和潮湿条件下作为木材胶粘剂时耐水性及力学性能较差。采用有机改性的纳米蒙脱土改性水性环氧树脂增强水性环氧树脂胶粘剂的耐水性及力学性能。并通过乳液包覆蒙脱土的方法与直接共混的方法对比，研究了不同添加量有机蒙脱土（0%，3%，6%，9%）对胶粘剂性能的影响。胶粘剂的耐水性及力学性能通过测量胶粘剂在干燥及潮湿条件下的剪切强度来表示。通过TGA、SEM、TEM、DSC研究了复合胶粘剂的热稳定性和结构。结果表明，在水性环氧树脂中添加有机改性的纳米蒙脱土，可以有效地提高胶粘剂的粘结强度，此外，采用乳液包有机覆蒙脱土的方法比直接共混的方法制备得到胶粘剂，有机蒙脱土在胶粘剂中分布更均匀，具有更优异的力学性能，说明有机蒙脱土在复合材料中的分散质量是影响复合胶粘剂性能的主要原因。     

环氧树脂胶粘剂在水利工程中的应用

环氧树脂胶粘剂具有非常强的粘接力,耐腐蚀性及介电性能也很好。将其运用于水利工程的混凝土中能够起到加固混凝土构件的作用。所以文章将环氧树脂胶粘剂用于水利工程的混凝土中研究其表现性能。通过实验研究的方法,研究内嵌式碳纤维混凝土使用环氧树脂胶粘剂后的压缩强度、分裂拉伸强度和弹性模量。结果表明,环氧树脂胶粘剂与水泥基胶粘剂相比具有更好的性能;当温度达到一定范围后,环氧树脂胶粘剂的性能将会降低;当暴露于高温的时间越来越长后,混凝土的压缩强度、弹性模量和开裂拉伸强度下降更多。     

室温固化环氧树脂结构胶粘剂的研究

制备了室温快速固化综合性能较好的聚氨酯改性环氧树脂结构胶粘剂,探讨了增韧剂、固化剂等因素对胶粘剂力学性能的影响,通过扫描电镜分析了胶粘剂断裂面的形貌特征,研究了胶粘剂形貌特征与力学性能的关系。结果表明:聚氨酯增韧环氧树脂既有物理交联产生“强迫互溶”和“协同效应”,又与环氧树脂发生了化学反应,产生的化学键进一步加强了聚合物交联密度和聚合物的强度,当PU预聚体用量为环氧树脂的40%时,聚氨酯与环氧树脂形成的互穿网络聚合物互穿程度最大,制备的胶粘剂力学性能最优,室温剪切强度达到20.16MPa。     

硫酸钙晶须对环氧胶粘剂性能的影响

本文初步研究了硫酸钙晶须对环氧树脂胶粘剂性能的影响,简要分析了硫酸钙晶须对环氧树脂胶粘剂增强和增韧的机理,得出了硫酸钙晶须增强环氧树脂胶粘剂体系基本组分的适宜配量,为环氧树脂增强和增韧提供了一种物理方法。     

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.     

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.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.