马来酸乙二醇酯、丙烯酸共聚物合成与在水质稳定上的应用研究

合成了马来酸与乙二醇的酯化物。用该酯化物与丙烯酸二元共聚，及用该酯化物、丙烯酸、马来酸酐三元共聚，得到了两种共聚物。讨论了二元共聚物的特性粘数与单体用量的关系，并测定了二元共聚物及三元共聚物对Ｃａ２＋的螯合能力。     

水质稳定剂AA/MEM共聚物合成与性能评价

合成了马来酸与乙二醇的酯化物,用该酯化物与丙烯酸二元共聚。研究了二元共聚物的特性粘数与单体用量关系,并测定了二元共聚物对Ca~(2+)的螯合能力。     

水质稳定剂AA／MEM共聚物合成与性能评价

合成了马来酸与乙二醇的脂化物，用该酯化物与丙烯酸二元共聚。研究了二元共聚物的物性粘数与单体用量关系，并测定了二元共聚物对Ｃａ＾２＋的螯合能力。     

塑料光导纤维芯材聚合物耐热性能研究

根据塑料光导纤维芯材聚甲基丙烯酸甲酯的结构和耐热性的关系，从（甲基）丙烯酸酯系中，优选出合适的单体与甲基丙烯酸甲酯共聚，得到了几种二元和三元共聚物。用热重分析及差热分析实验方法，测试了几种共聚物的热氧降解温度（Ｔｄ）及玻璃化温度（Ｔｇ）。结果表明，分别以甲基丙烯酸环己酯、甲基丙烯酸为第Ⅱ共聚单体，以丙烯酸甲酯为第Ⅲ共聚单体，合成的三元共聚物，耐热性比均聚物有明显改善。以丙烯酸环己酯为第Ⅱ共聚单体，合成的二元共聚物的Ｔｄ有显著提高，Ｔｇ略有下降     

丙烯腈/醋酸乙烯酯/甲基丙烯磺酸钠三元水相共聚体系竞聚率的研究

根据该AN/VAC/SMAS三元共聚体系特征,根据竞聚率计算的原理,融合二元共聚和三元共聚的基础理论,利用核磁共振技术测定共聚物组成,用Mayo-lewis共聚物组成方程拟合实验数据计算竞聚率.同时研究了AN/VAC/SMAS三元水相共聚反应体系的特征,测定了该三元共聚体系表现竞聚率.     

马来酸酐三元共聚物的制备及其复合材料的介电性能研究

以马来酸酐、乙酸乙烯酯和丙烯酸为单体,采用沉淀聚合法合成马来酸酐-乙酸乙烯酯-丙烯酸三元共聚物。将共聚物与锆钛酸铅(PZT)粉末热压共混,制备出系列高介电性的陶瓷/聚合物复合材料。通过对PZT/聚合物复合材料进行介电性能分析,结果表明复合材料的介电常数随PZT含量的增加而增加,介电损耗随PZT含量增加而减少。与不含丙烯酸的马来酸酐-乙酸乙烯酯二元共聚物/PZT复合材料相比,介电常数提高1倍左右,表现出超高的介电性能。高含量马来酸酐三元共聚物的采用有利于提高复合材料的介电性能。     

丙烯酸酯共聚物对柴油降凝效果的试验研究

柴油流动改进剂的降凝机理与润滑油降凝剂的降凝机理基本相同。因此丙烯酸高级酯与第二单体的共聚物对柴油的降凝效果应与润滑油的降凝效果基本相同。用几种溶剂采用溶液聚合方法,用正交试验法或均匀试验法对丙烯酸高级酯与第二单体进行共聚试验,共聚物做柴油标准油的降凝测定,以共聚物降凝度为考察目标,探讨丙烯酸高级酯与第二单体共聚物对柴油和柴油馏分的降凝效果。     

丙烯酸十二酯共聚物稠化能力的试验研究

聚(甲基)丙烯酸酯或丙烯酸高级酯与其它一些单体的共聚物是一类优良的油品增粘-降凝双效剂。丙烯酸十二酯与第二单体A的共聚物对润滑油有较好的降凝效果。丙烯酸十二酯与第二单体A的共聚物对润滑油也应有较好的增粘作用(即稠化能力)。用四种溶剂分别采用溶液聚合方法,用正交试验法对丙烯酸十二酯与第二单体A进行共聚试验,共聚物以1%的添加量加入到润滑油基础油中,做调合油的粘度测定,以增比粘度、粘温指数Q和粘度指数VI为考察目标,探讨丙烯酸十二酯与第二单体A共聚物对润滑油基础油的稠化能力,并找出较好的共聚条件。试验结果表明:丙烯酸十二酯与第二单体A共聚物对润滑油确有较好的增粘和改变油品粘温性能的作用,是一种增粘-降凝双效添加剂。     

硅垢的抑制方法

介绍了用选择的低分子量（甲基）丙烯酸或马来酸基二地共聚物或三元共聚物，镁离子或选择的二元共聚物或三元共聚物与铝离子或镁离子的混合物，或聚丙烯酸或聚马来酸与铝离子或镁离子的混合物来抑制含水系统中硅垢形成的方法。     

国外氯乙烯—丙烯酸酯共聚物生产方法简述

丙烯酸酯系不饱和酯之一。它同氯乙烯等共聚单体有较好的聚合能力。可以采用乳液法及其它聚合方法进行二元、三元或四元共聚;丙烯酸酯本身又可用多种方法均聚或交叉聚合(甲、乙、丁、2 —乙基己酯等之间),都能够得到性质良好的共聚或均聚树脂。这类树脂在聚氯乙烯加工中作为优良改性剂获得了广泛的应用。当前我国丙烯酸原料充裕,因此,研究丙烯酸酯同氯乙烯的共聚合,以及其共聚产品的应用前途,无疑具有现实意义。 早在二次大战之前,德国就以丙烯酸酯(甲醇为主)作为第二单体同氯乙烯乳液法共聚。后来的研究表明,氯乙烯—丙烯酸酯共聚物尚有所谓内增塑性。并且,更为重要的是,丙烯酸酯的共聚物或均聚     

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。