聚脲基氨酯增强增韧环氧树脂性能的研究

用原位多相聚合技术合成了聚脲基氨酯/环氧树脂互穿网络聚合物(IPN),得到了环氧树脂准分子复合材料,测定了产物的力学性能和热性能,探讨了聚酯棚埘分子质量和聚脲基氨酯加入量对环氧树脂增强增韧过程的影响,并对反应体系的活性进行了考察。     

2004年（14卷）弹性体分类总目次

科研开发负载钛体系催化合成聚 1 丁烯热塑性弹性体孟凡旭 ,姚　薇 ,黄宝琛 ,等………………… (1 - 1 )甲壳素型聚脲氨酯的合成与性能研究彭志平 ,刘朋生………………………………………… (1 - 6)POE与EPDM性能的比较闫　枫 ,邱桂学 ,潘炯玺…………………………………………… (1 - 1 0 )阴极聚氨酯电泳涂料的漆膜性能研究李再峰 ,梁自禄………………………………………… (1 - 1 4 )偶联剂对有机硅改性天然胶乳性能的影响孙　燕 ,谭海生 ,王小平 ,等……………………… (1 - 1 7)氢化SBS结构与组成的表征梅　铭 ,李　蕾 ,戴立平 ,…     

聚脲基氨酯增强增韧环氧树脂的研究

用原位多相聚合法合成了聚脲基氨酯/环氧树脂互穿聚合物网络（IPN）,测定了产物的力学性能和热性能。探讨了IPN中聚脲基氨酯含量对环氧树脂增韧过程的影响,结果表明,对于N,N-二甲基苄胺固化体系,加入12.0phr的聚脲基氨酯,在不降低其热稳定性的同时,可使环氧树脂冲击强度提高35%左右,拉伸强度提高12%～15%;对于4,4＇-二氨基二苯砜或4,4＇-二氨基二苯甲烷固化体系,加入12.0phr的聚脲基氨酯可使环氧树脂冲击强度提高92%左右,拉伸强度提高20%～24%。     

聚天冬氨酸酯聚脲的研究进展

聚天冬氨酸酯聚脲是一种新型的脂肪族、慢反应、高性能的绿色环保材料，本文根据当下对聚天冬氨酸酯聚脲的研究趋势和热点进行了总结归纳，介绍了聚天冬氨酸酯聚脲结构、不同于常规聚脲的反应机理以及优缺点，重点介绍了聚天冬氨酸酯聚脲的制备、改性方法以及聚天冬氨酸酯聚脲近几年的应用领域，最后总结归纳了聚天冬氨酸酯聚脲发展过程中存在的问题和发展方向。     

聚醚型聚脲基甲酸酯增强增韧环氧树脂的研究

用原位多相聚合法合成了聚谜型聚脲基甲酸酯环氧树脂互穿网络聚合物 (IPN) ,得到了环氧树脂准分子复合材料 ,测定了产物的力学性能和热性能 ,探讨了聚醚分子量和聚脲基甲酸酯加入量对环氧树脂增强增韧过程的形响。结果表明分子量为 1 0 0 0的聚醚所合成的聚脲基甲酸酯的改性效果较好 ,加入量为1 2 .0 phr可使环氧树脂冲击强度提高 70 % ,拉伸强度提高 45 %。     

喷涂聚脲弹性体的研究进展

综述了喷涂聚脲弹性体(SPUA)的最新研究进展,主要介绍了其结构组成与表征、种类(包括芳香族聚脲弹性体,脂肪族聚脲弹性体和聚天门冬氨酸酯(PAE)聚脲弹性体等)及其应用进展,并对其推广应用及今后的发展作了展望。     

新型聚脲弹性涂料的制备及其性能研究

以甲苯二异氰酸酯(TDI)、三羟甲基丙烷(TMP)和聚合物二醇为主要原料合成TDI型聚脲固化剂(预聚体);用该固化剂与胺组分聚天门冬氨酸酯制备聚天门冬氨酸酯聚脲弹性涂料。通过研究聚合物二元醇种类、预聚体的异氰酸酯含量[w(—NCO)]、预聚体的平均官能度、胺组分种类与用量、异氰酸根指数(R)对聚脲弹性体拉伸强度、断裂伸长率、硬度等性能的影响,研制出了性能相对较好且具有合适施工期的新型聚脲弹性涂料。新型聚脲弹性涂料制备的最佳配方为:自制固化剂的w(—NCO)为9%,平均官能度为2.2,F420与F520的物质的量比为4∶1,异氰酸根指数(R)为1.05,所制得的弹性涂料拉伸强度为8.1 MPa,断裂伸长率为218%,邵氏D硬度为73,施工期为90 min,并表现出良好的防腐、防水性能。     

聚天门冬氨酸酯在直升机复合材料上的应用研究

以Desmophen NH 1520和Desmophen NH 1420聚天门冬氨酸酯为基料,以HDI三聚体Desmodur N 3600为固化剂,制得了直升机复合材料用蒙皮涂料。研究了聚天门冬氨酸酯聚脲涂料中n(—NCO)/n(—NH)和涂膜性能的关系,涂膜厚度对涂膜性能的影响,用拉开法对涂膜附着力作了数字化表征,并从化学分子结构上聚天门冬氨酸酯聚脲作了分析,对聚天门冬氨酸酯聚脲作为一种新型材料作了展望。     

聚脲基氨酯增强韧环氧树脂性能的研究

用原位多相聚合技术合成了聚脲基氨酯／环氧树脂互穿网络聚合物（IPN）,得到了环氧树脂准分子复合材料,测定了产物的力学性能和热性能,探讨了聚酯相对分子质量和聚脲基加入量对环氧树脂增强增韧过程的影响,并对反应体系的活性进行了考察。     

高性能聚脲弹性体的研究与进展

聚脲弹性体是一种无溶剂的环保型材料,具有优异的力学性能和耐化学介质性。综述了芳香族聚脲、脂肪族聚脲和聚天冬氨酸酯聚脲的研究现状。着重介绍了聚天冬氨酸酯聚脲的合成技术与应用领域,并展望了聚脲技术的发展趋势与方向。     

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。