不同碳酸钙对PVC制品机械性能的影响

介绍了不同类型的碳酸钙填充PVC制品（分硬制品和软制品）时，对制品机械性能的影响，为塑料加工行业提供了使用不同类型碳酸钙的依据，结果表明，经过表面处理的碳酸钙提高了PVC制品的机械性能。     

“加工与应用”栏目征文启事

《聚氯乙烯》杂志“加工与应用”栏目主要报道的内容为：PVC加工过程中的配方设计、工艺优化、疑难问题的分析与解决，新型PVC制品的开发与应用，PVC制品在应用过程中出现的问题与解决措施，PVC制品相关标准与政策的解析等。     

“加工与应用”栏目征文启事

《聚氯乙烯》杂志“加工与应用”栏目主要报道的内容为：PVC加3-过程中的配方设计、工艺优化、疑难问题的分析与解决，新型PVC制品的开发与应用，PVC制品在应用过程中出现的问题与解决措施，PVC制品相关标准与政策的解析等。     

用羧酸酯镧热稳定剂生产硬质及软质PVC透明制品

用羧酸酯镧（特别是三富马酸单苯甲酯镧）作热稳定剂，生产出的硬质及软质PVC透明制品性价比高，耐热性好，且该PVC透明制品无毒。     

新型结构螺杆在PVC制品挤出中的应用

根据近年将新型结构螺杆用于PVC制品挤出成型的成功经验，分别对分流型、屏障型、分离型及变流道型等结构型式的螺杆在PVC制品挤出成型方面的应用及特点进行了论述。     

《聚氯乙烯》杂志“加工与应用”栏目征文启事

《聚氯乙烯》杂志“加工与应用”栏目主要报道的内容为：PVC加工过程中的配方设计、工艺优化、疑难问题的分析与解决,新型PVC制品的开发与应用,PVC制品在应用过程中出现的问题与解决措施,PVC制品相关标准与政策的解析等。     

硬聚氯乙烯发泡制品改性剂KM—318F简介

KM—318F(甲基丙烯酸酯的多元聚合物)是美国罗姆哈斯公司生产的一种用于PVC发泡制品的改性剂,外观为白色粉末;假比重0.6g/cc;挥发成份小于1％;易与PVC树脂掺合。 PVC低发泡制品有管材、板材和异形材。其管材可达到铁管、钢管的性能,由于PVC低发泡制品无论板材或异形材在比重     

中国塑料工业现状及展望

叙述了我国塑料工业现状、PVC制品的应用情况和环境保护问题,并展望了塑料加工业的发展趋势。     

更高效的PVC加工助剂

坐落于美国康涅狄格州的康普敦(Crompton)公司本着改善助剂环境友好特性的观点出发,开发出一系列提高性能效率的聚氯乙烯加工助剂。最新的开发成果包括挥发性有机化合物(VOC)含量低的PVC软、硬制品热稳定剂;以及用于PVC硬制品加工的冲击改性剂。     

聚氯乙烯制品应有持续发展的空间

1．美国PVC硬制品发展速度快：自50年代人造革发展以来，现在更多的是PVC管件、窗框等型材、PVC埋地排水管，重点采用更广泛的添加剂和改进设备。     

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.     

Novel polyurethane coating technology through glycidyl carbamate chemistry

Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.     

Highly moisture-proof polysilsesquioxane coating prepared via facile sol-gel process

A highly moisture-proof polysilsesquioxane coating was obtained from a new bis-silylated precursor, which was synthesized from 3-aminopropyltriethoxysilane (APTES) and m-xylylene diisocyanate (m-XDI) in tetrahydrofuran (THF) and verified by ¹H MAS NMR. For direct comparison purposes, an SiO₂ coating was also prepared by the Stöber method using tetraethoxysilane (TEOS) as the reactant. Interestingly, the coating obtained from the polysilsesquioxane sol exhibited a much higher moisture resistance capability than its counterpart, which was attributed to its more compact feature between nanoparticles as characterized by N₂ absorption experiment and transmission electron microscopy (TEM). Furthermore, its high transparency of about 92% showed potential for application in the protection of optical crystals.