液体橡胶／环氧树脂复合材料的制备与性能研究

用端异氰酸酯基聚丁二烯液体橡胶与环氧树脂制得端异氰酸酯基聚丁二烯液体橡胶与环氧树脂反应物（ETPB）。在ETPB中加入纳米Al2O3,并选择适宜的固化剂固化,制得ETPB／Al2O3复合材料。测试了ETPB和ETPB／Al2O3复合材料于石英砂-水介质中的冲蚀磨损性能,并用扫描电子显微镜（SEM）对材料磨损表面进行了观察。结果表明,ETPB和ETPB／Al2O3复合材料在不同线速度下,随着线速度的增加冲蚀磨损率也随着增加。     

纳米Al2O3填充液体橡胶／环氧树脂复合材料的性能研究

用端异氰酸酯基聚丁二烯液体橡胶与环氧树脂制得端异氰酸酯基聚丁二烯液体橡胶／环氧树脂聚合物（ETPB）。在ETPB中分别加入质量分数5％和10％的纳米Al2O3,并选择适宜的固化剂固化,制得ETPB／Al2O3复合材料。考查了ETPB与ETPB／Al2O3复合材料的力学性能,研究了该材料的滑动摩擦磨损率与滑动速度之间的关系,并用扫描电子显微镜（SEM）对几种材料磨损表面进行了观察。结果表明,通过填充纳米Al2O3无机粒子可显著提高ETPB的性能,当填充量为5％时,ETPB／Al2O3复合材料性能最佳。     

纳米填料／液体橡胶／环氧树脂复合涂层剪切及冲蚀性能研究

采用端异氰酸酯基聚丁二烯液体橡胶和环氧树脂反应而得端异氰酸酯基聚丁二烯液体橡胶与环氧树脂反应物（ETPB）。在ETPB中分别加入不同质量分数的纳米Al2O3及固化剂,制得ETPB／Al2O3复合涂层,测试其剪切强度及冲蚀磨损性能,并用扫描电子显微镜（SEM）对几种涂层磨损表面进行了观察。结果表明,在ETPB中加入10％的纳米Al2O3及20％的聚酰胺固化剂时,涂层的剪切及冲蚀性能最好。     

干滑动下端羟基聚丁二烯液体橡胶-环氧树脂复合材料的摩擦性能

用端异氰酸酯基聚丁二烯液体橡胶与环氧树脂制得端异氰酸酯基聚丁二烯橡胶-环氧树脂聚合物(ETPB)。在ETPB中分别加入质量分数为5%和10%的纳米三氧化二铝,并用胺类固化剂固化,制得ETPB/纳米三氧化二铝复合材料。测试了环氧树脂、ETPB和ETPB-纳米三氧化二铝复合材料在干滑动下的摩擦性能,考察了磨损率及摩擦系数与载荷和滑动速度之间的关系,用扫描电子显微镜对几种材料磨损表面进行了观察。结果表明,用端异氰酸酯基聚丁二烯液体橡胶改性环氧树脂可提高干滑动条件下环氧树脂的抗磨损性能;填充纳米三氧化二铝可显著提高ETPB的抗磨损性能,其最佳填充质量分数为5%。     

液体橡胶-环氧树脂复合材料在液体石蜡润滑下的摩擦性能

用端异氰酸酯基液体橡胶与环氧树脂制得液体橡胶-环氧树脂聚合物(ETPB).在ETPB中分别加入质量分数为5%和10%的纳米Al2O3,并选择适宜的固化剂固化,制得ETPB-Al2O3复合材料.测试了ETPB,ETPB-Al2O3复合材料在液体石蜡润滑下的滑动摩擦性能,考察了磨损率及摩擦系数与载荷和滑动速度之间的关系,并用扫描电子显微镜(SEM)对几种材料磨损表面进行了观察.结果表明,端异氰酸酯基液体橡胶改性环氧树脂可显著提高抗磨损性能;填充纳米Al2O3无机粒子可显著提高ETPB的抗磨损性能,其最佳填充量为5%.     

水润滑下纳米三氧化二铝/端异氰酸酯基聚丁二烯液体橡胶-环氧树脂复合材料的摩擦性能

研究了纳米Al2O3/端异氰酸酯基聚丁二烯液体橡胶-环氧树脂(ETPB)复合材料在水润滑条件下的摩擦性能,并用扫描电子显微镜表征了复合材料的磨损表面形貌,探讨了磨损机理。结果表明,在水润滑条件下,纳米Al2O3/ETPB复合材料的磨损率和摩擦系数低于ETPB;载荷和滑动速率的变化对纳米Al2O3/ETPB复合材料的磨损率、摩擦系数及磨损表面形貌影响不大,复合材料的磨损表面均未产生裂纹;ETPB的磨损机理为疲劳磨损,纳米AlO/ETPB复合材料的磨损机理为机械抛光磨损。     

液体橡胶改性环氧树脂固化及应用研究

用聚丁二烯液体橡胶与环氧树脂制得聚丁二烯液体橡胶/环氧树脂(ETPB)胶粘剂。本文研究ETPB固化剂加入量对粘接和剥离强度的影响。由于该胶粘剂的粘接和剥离性能优异,所以可用于水轮机的耐磨涂层。本文对该胶粘剂在水轮机上的应用性能进行了讨论。结果表明,在ETPB中加入固化剂量为20%时,材料的粘接和剥离性能最好,并且与水轮机用不锈钢性能相比相差不大,可以作为廉价的水轮机叶片保护涂层。     

2006年中国聚氨酯论文文摘（二十六）

纳米Al2O3填充端异氰酸酯基聚丁二烯橡胶-环氧树脂复合涂层的干滑动摩擦磨损性能研究;纳米CaCO3改性水性聚氨酯涂料的研究探讨;蒙脱土改性水性聚氨酯的研究;纳米SiO2的表面改性及其在聚氨酯弹性体中的应用;纳米SiO2对聚氨酯清漆性能的影响……     

纳米Al2O3/环氧树脂复合材料的制备及性能

在原位法制备纳米复合材料时，要使纳米粒子在树脂中分散均匀，必须首先获得稳定的单体悬浮体系。基于这一原理，本文通过对纳米Al2O3表面改性即选择合适的分散剂，获得稳定的纳米Al2O3/丙酮悬浮液，然后将环氧树脂溶解于其中，制得纳米Al2O3／环氧树脂复合材料。运用透射电子显微镜，观察了纳米Al2O3在环氧基体中的分散情况。分析并讨论了纳米Al2O3含量对该复合材料力学性能的影响。结果表明：利用稳定的悬浮体系能制得分散较为均匀的纳米复合材料，在纳米Al2O3含量为5％的情况下，纳米复合材料的力学性能达到最优。     

PA6／纳米A12O3复合材料摩擦性能的研究

研究了纳米Al2O3填充PA6复合材料的摩擦性能。通过分析纳米Al2O3含量、载荷对材料摩擦系数和耐磨性能的影响，得到复合材料中纳米Al2O3为6wt％时，材料的摩擦性能最好。通过SEM图片分析试件摩擦表面形貌，发现复合材料的磨损机理从纯PA6材料的粘着磨损转为轻微的磨粒磨损和粘着磨损。     

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。