白度化微胶囊红磷阻燃剂的制备及其应用

研究了白度化微胶囊红磷阻燃剂的制备方法,并研究了其对聚丙烯材料的氧指数影响。采用XPS、SEM、TG、磷化氢释放量、抗氧化性、吸湿性等对其进行了表征,结果表明:红磷阻燃剂微胶囊包覆效果有明显改善作用,其吸湿性、抗氧化性、PH3释放量均大大减少;XPS图谱表明99.5%的红磷已被包覆;扫描电镜显示红磷阻燃剂平均粒径为0.24μm;TG显示红磷阻燃剂的着火点已提高到435℃;氧指数测试结果表明:经红磷阻燃剂阻燃后,聚丙烯的氧指数已提高到28。     

微胶囊红磷膨胀型阻燃剂的制备及应用

制备了微胶囊红磷/季戊四醇/三聚氰胺膨胀型阻燃剂(IFR)。采用吸湿性、抗氧化性、SEM、TG等测试方法对阻燃剂进行了表征。结果表明:微胶囊红磷的吸湿性减小、抗氧化性增强;TG分析显示,微胶囊红磷在385~422℃、470~553℃有两个失重阶段;600℃时,未包覆红磷残重仅为6%,而微胶囊包覆红磷的残重为12%;微胶囊红磷膨胀型阻燃剂的最佳组成为:微胶囊红磷:季戊四醇:三聚氰胺=4.00:0.75:2.00(摩尔比);500℃下,IFR残重高达65.06%;当IFR添加量为30%时,阻燃环氧树脂的氧指数从未添加IFR时的19.0%提高到26.3%。     

双层包覆红磷的制备及阻燃聚丙烯的研究

采用沉淀法制备双层包覆红磷（DERP），通过FESEM、XPS、TG、吸湿性测试对其进行了表征。结果表明：红磷表面形成均匀的包覆层，包覆率达到97．18％，包覆后的红磷吸湿性也得到较大改善，着火点提高到430℃。将阻燃剂DERP添加到聚丙烯中，质量分数为5％时，阻燃级别可达到UL94V-0级。     

白度化微胶囊红磷阻燃剂的研究与制备

利用有机、无机双层包覆对红磷进行改性合成了白度化微胶囊红磷阻燃剂,考察了搅拌速度、有机包覆剂、无机包覆剂、温度、红磷粒径、水固比、p H等对合成白度化微胶囊红磷阻燃剂的影响,并测试其阻燃性能,最终确定温度、无机包覆剂、p H为影响合成反应的主要因素。通过单因素和正交实验得到合成白度化微胶囊红磷阻燃剂的最优条件。所合成的白度化微胶囊红磷阻燃剂实际具有的阻燃温度为425℃。     

微胶囊化红磷阻燃剂的研制及应用

论述了红磷包覆的必要性及包覆方法。分别采用酚醛树脂、脲醛树脂对红磷进行微胶囊化,检测了红磷包覆前后PH_3的释放量,研究微胶囊化红磷对MC-尼龙的阻燃性能。     

微胶囊化红磷阻燃剂的研制及应用

论述了红磷包覆的必要性及包覆方法。分别采用酚醛树脂、脲醋树脂对红磷进行微胶囊化，检测了红磷包覆前后PH3的释放量，研究微胶囊化红磷对MC－尼龙的阻燃性能。     

超细红磷阻燃剂的表面包覆研究

采用无机氢氧化物及偶联剂对超细红磷阻燃剂进行包覆，制成微胶囊化红磷，以提高红磷的安定性。通过差热(DTA)、红外光谱(IR)、吸湿性测试等方法对微胶囊化红磷进行了表征，并对影响包覆效果的多种因素进行了初步研究。实验结果表明：经包覆的红磷安定性得到提高，吸湿率降低。     

超细红磷阻燃剂的表面包覆研究

采用无机氢氧化物及偶联剂对超细红磷阻燃剂进行包覆，制成微胶囊化红磷，以提高红磷的安定性。通过差热(DTA)、红外光谱(1R)、吸湿性测试等方法对微胶囊化红磷进行了表征，并对影响包覆效果的多种因素进行了初步研究。实验结果表明：经包覆的红磷安定性得到提高，吸湿率降低。     

纳微化红磷的有机/无机双层包覆化及其阻燃性能研究

为了实现红磷的纳微化以及表面有机无机双层包覆,解决红磷保存时吸湿和释放有毒气体以及在高分子基材中的分散不均匀性问题,本研究借助易于工业化的球磨技术,制备出纳微化的红磷粒子,再分别利用二氧化硅为无机层,三聚氰胺氰尿酸盐为有机层,实现红磷的有机/无机双层包覆化。借助纳米粒度仪、扫描电镜和热重分析仪等表征手段,研究得出:双层包覆微胶囊红磷24h吸湿增重率仅0. 28%,磷化氢释放量控制在2×10~(-6),红磷保存性改善。将双层包覆红磷作为阻燃剂,物理共混于环氧树脂,发现添加16%含量时,极限氧指数最高为28. 2%;红磷与包覆层之间构成磷氮硅协效作用,属于凝聚相、气相双重阻燃,形成蓬松、封闭外层的炭层,起阻隔作用,增大了阻燃效率。这项研究可望为新型红磷阻燃剂的研究提供一定的理论借鉴意义。     

纳微化红磷的有机/无机双层包覆化及其阻燃性能研究

为了实现红磷的纳微化以及表面有机无机双层包覆,解决红磷保存时吸湿和释放有毒气体以及在高分子基材中的分散不均匀性问题,本研究借助易于工业化的球磨技术,制备出纳微化的红磷粒子,再分别利用二氧化硅为无机层,三聚氰胺氰尿酸盐为有机层,实现红磷的有机/无机双层包覆化。借助纳米粒度仪、扫描电镜和热重分析仪等表征手段,研究得出:双层包覆微胶囊红磷24h吸湿增重率仅0. 28%,磷化氢释放量控制在2×10-6,红磷保存性改善。将双层包覆红磷作为阻燃剂,物理共混于环氧树脂,发现添加16%含量时,极限氧指数最高为28. 2%;红磷与包覆层之间构成磷氮硅协效作用,属于凝聚相、气相双重阻燃,形成蓬松、封闭外层的炭层,起阻隔作用,增大了阻燃效率。这项研究可望为新型红磷阻燃剂的研究提供一定的理论借鉴意义。     

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.     

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.