一缩二丙二醇二苯甲酸酯的研制

本文论述了苯甲酸和聚醚生产中的副产物一缩二丙二醇（ＤＰＧ）用于合成一缩二丙二醇二苯甲酸酯（ＤＰＧＤＢ）的工艺过程及最佳工艺条件的确定，该工艺ＤＰＧＤＢ产率为９３．５％，产品纯度高达９９％以上，并且测试了产品的增塑性能。     

NBR/EPDM共混物的研究

研究了胶料配方和加工工艺对ＮＢＲ／ＥＰＤＭ共混物性能的影响。试验结果表明,ＮＢＲ／ＥＰＤＭ以６０／４０比例共混,可以采用ＤＣＰ＋硫黄硫化体系,补强填料可以采用活性比较大的炭黑,如果采用白色或浅色填料,则要添加偶联剂;共混物混炼可采用ＮＢＲ和ＥＰＤＭ分别配合混炼,然后再按比例掺混的工艺;ＮＢＲ／ＥＰＤＭ以６０／４０比例共混,耐臭氧性优良,低温性能和耐热性能较好,耐油性能一般。     

HDPE／PC共混体系的增容剂分子设计与合成

介绍了高密度聚乙烯（ＨＤＰＥ）／聚碳酸酯（ＰＣ）共混体系的增容剂的分子设计与合成技术。采用了低密度聚乙烯（ＬＤＰＥ）在引发剂过氧化苯甲酰（ＢＰＯ）存在下与二烯丙烯双酚Ａ（ＤＡＢＰＡ）在二甲苯中进行溶液接枝共聚反应的工艺。通过重量法和Ｘ－射线光电子能谱（ＸＰＳ）证实了接枝共聚物（ＬＤＰＥ－ｇ－ＤＡＢＰＡ）的存在。研究了引发剂ＢＰＯ用量、单体ＤＡＢＰＡ用量、反应时间及反应温度对接枝率的影响,确定了合成     

双环戊二烯酚型树脂的合成及其结构表征

在８０￣１４０℃下ＤＣＰＤ与苯酚（或烷基酚）经催化反应合成ＤＣＰＤ酚型树脂。研究了反应温度，反应时间，催化剂用量、ＤＣＰＤ与酚的配比等条件对合成ＤＣＰＤ酚树脂的影响。经红外光谱及核磁共振光谱表征了ＤＣＰＤ酚树脂的化学结构。     

DNBP的合成及动力学研究

ＤＮＢＰ是一种重要的苯乙烯用阻聚剂，笔者提出了在有机溶剂中用硝酸直接硝化制ＤＮＢＰ的新方法，实验确定了反应条件对ＤＮＢＰ收率的影响，并获得了适宜的合成工艺条件。在此基础上，进行了上述反应的动力学研究，获得了此硝化反应的动力学方程方式为（－ｒＡ＝１．５８＊１０＾４ｅｘｐ（－１７５８６／ＲＴ。     

HDPE和NBR共混改性及其工艺条件的研究

研究了三种牌号的ＨＤＰＥ（８９００Ｓ、５０００Ｓ、５０７０ＥＡ）与两种牌号的ＮＢＲ（ＮＢＲ—１８,ＮＢＲ－２６）改性的共混体系。结果表明：用极性ＮＢＲ改性非极性ＨＤＰＥ,其改性效果除了与ＮＢＲ的牌号、含量和基体树脂ＨＤＰＥ的熔体指数有关之外,还与混炼时间、温度、辊距等工艺条件有关,并讨论了对体系冲击性能的影响。     

LDPE交联电缆料PE—K—18D022的开发研究

本文介绍了ＬＤＰＥ交联电缆料ＰＥ－Ｋ－１８Ｄ０２２的开发研制过程，包括：工艺参数的确定，过程控制，最终产品的性能等。生产实践和用户使用表明ＰＥ－Ｋ－１８Ｄ０２２的工艺过程，操作条件合理；生产参数确定准确；产品性能优良，经交联加工后生产的电缆料达到英国ＢＰ公司同类产品水平。     

粘接性树脂在PTC自限温伴热带中应用

研究了以乙炔炭黑为导电粒子,ＨＤＰＥ、ＬＬＤＰＥ及粘接性树脂（接枝高密度聚乙烯（ｇ ＨＤＰＥ））为基体的导电复合物ＰＴＣ行为,电致发热特性及电压循环冲击试验。结果发现,ｇ ＨＤＰＥ／ＣＢ导电复合材料、ＬＬＤＰＥ／ｇ ＨＤＰＥ／ＣＢ复合物的ＰＴＣ复演性及电阻稳定性均优于ＬＬＤＰＥ／ＣＢ及ＨＤＰＥ／ＣＢ导电体系     

氯化溴法合成2,4,6——三溴苯酚的研究

介绍了氯化溴地在盐酸和卤代烃的多相介质中合成２，４，６－－三溴苯酚的方法，系统地研究了各种因素对合成ＴＢＰ的影响。确定了优惠工艺条件，并提出了产品的后处理方法。     

线性低密度聚乙烯共混物

线性低密度聚乙烯共混物ＬＬＤＰＥＰＯＬＹＭＥＲＢＬＥＮＤ王奇坤，康洪义１前言线性低密度聚乙烯（ＬＬＤＰＥ）是乙烯与少量烯烃的共聚物，６０年代加拿大ＤｕＰｏｎｔ公司用溶液法生产，７０年代美国ＵＣＣ公司成功地开发出气相法工艺，进入８０年代ＬＬＤＰＥ得到迅...     

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.