聚酰胺树脂醇溶液研制及防腐应用

制备一系列组成不同的聚酰胺树脂醇溶液,考察各种因素对其凝胶时间的影响,得出：采用不同溶剂合成的溶液,凝胶时间都溶质浓度的增大而缩短;加入不同抗交剂,可以延长凝胶时间;在合成过程中,提高反应温度,增加搅拌速度,会使溶液的凝胶时间缩短另外,测定了所制备产物的粘度,发现溶液粘度随浓度的增大而增大,并随温度的升高而降低。对合成产品做为金属防腐涂料进行实验,证明其具有良好的耐酸、耐碱、耐盐耐油等性能,支附着     

全国计算机等级考试考务管理系统

介绍一种在 Fox Pro编程环境下开发的全国计算机等级考试考务管理系统 ,该系统采用交互式人机对话和模块化设计方式 ,实现对考点考务的日常维护和管理 ,减轻了考务管理人员的工作负担。该系统经过考点的长期运行操作 ,表明该系统是安全、可靠的。     

加压方式对PP／GMT片材孔隙含量和弯曲性能的影响

针对ＰＰ／ＧＭＴ体系,研究了以加压和辊筒加压两种方式下温度和压力对片材孔隙含量和弯曲强度的影响,得了了两种加压方式下的最佳浸渍温度和压力。实验中的各种条件下,辊筒加压所得片材的孔隙含量均低于平板加压所得片材的孔隙含量,而弯曲强度均较高,因而。中压方式明显优于平板加压方式。     

Synthesis and characterization of 4,4′-diacryloyloxybenzophenone

A copolymerizable type II photoinitiator 4,4′-diacryloyloxybenzophenone (DABP) based on 4,4′-dihydroxybenzophenone (DHBP) and acryloyl chloride was synthesized, and its structure was confirmed by ¹H NMR and real-time infrared spectroscopy. UV–vis absorption spectroscopy of DABP exhibited red-shifted maximal absorption as compared with benzophenone (BP). The kinetics of photopolymerization was studied by real-time infrared spectroscopy. It showed that DABP was a more effective photoinitiator than benzophenone. When this photointiator and amine was used to efficiently initiate polymerization of acrylates and methacrylates, both rate of polymerization and final conversion increased and the induction period was shortened with increase of amine concentration, DABP concentration and light intensity.     

防冻型黏土质可塑料的研制

为了提高可塑料的抗冻结能力,以粒度为6～3、3～1、≤1 mm的焦宝石(w(Al2O3)>45%,w(SiO2)<52%)和粒度≤45μm的黏土(w(Al2O3)>26%,w(SiO2)<65%)为原料,加入硫酸铝溶液、水和乙二醇防冻液制备出防冻型黏土质可塑料.将试样放入零下15℃的试验箱中冷冻,在室温下放置至室温,再经110℃干燥和1 000℃热处理后,分别测试试样的线变化率、抗折强度、耐压强度和体积密度,并与常温20℃下放置的试样的各项性能加以比较.结果表明:试样经过110℃和1 000℃热处理后,普通可塑料试样在零下15℃冻结后的强度比正常未冻结试样的下降约20%,而防冻型可塑料与正常试样相比,在强度方面几乎没有改变.     

N-(2-Hydroxyethyl)formamide as a new plasticizer for thermoplastic starch

N-(2-Hydroxyethyl)formamide (HF) was synthesized efficiently and used as a new plasticizer for corn starch to prepare thermoplastic starch (TPS). The hydrogen bond interaction between HF and starch was proved by Fourier-transform infrared (FT-IR) spectroscopy. Scanning electron microscope (SEM) revealed that starch granules were completely disrupted and a continuous phase was obtained. The crystallinity of corn starch and HF-plasticized TPS (HTPS) were characterized by X-ray diffraction (XRD). The glass transitions of glycerol-plasticized TPS (GTPS) and HTPS were investigated by differential scanning calorimetry (DSC). The water resistance of GTPS was better than that of HTPS. In addition, the flexibility of HTPS was better than that of GTPS at low relative humidity.     

Effects of moderate pressure on premeability and viability of <Emphasis Type="Italic">Saccharomyces cerevisiae</Emphasis> cells

With CO₂ and N₂ as the pressure media, the effects of the moderate pressure (0.1–1.0MPa) and the holding time on the conductivities of the cell suspension of Saccharomyces cerevisiae CICC1447 and Saccharomyces cerevisiae CICC1339, as well as the absorbances of the supernatant (after centrifuged) at 280 nm (A₂₈₀) and 260 nm (A₂₆₀) were determined. The membrane permeability of Saccharomyces cerevisiae CICC1447 increased significantly and the cell leakage was aggravated with the pressure increase. For Saccharomyces cerevisiae CICC1339, the conductivity of the cell suspension, A₂₈₀ and A₂₆₀ of the supernatant fluctuated with the pressure increase; as a whole, they increased with pressure. Different from high pressure, a moderate pressure not only remarkably improved the permeability of the yeast cell membrane, but also kept yeast cell viability; moreover, the integrity of the yeast cell membrane could be maintained. The first author and the fifth author contributed to the work equally.     

国外HSE管理体系的应用状况及发展趋势

介绍了HSE管理体系在壳牌、BP、杜邦等跨国石油公司的应用情况及发展趋势。     

聚丙烯基原位成纤复合材料研究进展

以聚对苯二甲酸乙二酯(PET)、尼龙(PA)66、PA6、超高分子量聚乙烯(UHMWPE)、聚苯硫醚(PPS)、聚萘二甲酸乙二酯(PEN)等热塑性树脂为成纤聚合物,综述了利用这些成纤聚合物制备聚丙烯(PP)基原位成纤复合材料的方法、技术及复合材料的结构特征、力学性能.提出了优化PP基原位成纤复合材料综合力学性能的思路.     

Synthesis and Characterization of the Different Soy-Based Polyols by Ring Opening of Epoxidized Soybean Oil with Methanol, 1,2-Ethanediol and 1,2-Propanediol

Three soy-based polyols intended for application in polyurethanes were prepared by ring opening the epoxy groups in epoxidized soybean oil (ESO, 0.385 mol/100 g epoxy rings) with methanol, 1,2-ethanediol and 1,2-propanediol in the presence of tetrafluoroboric acid catalyst. The effect of the different opening reaction reagents, different low molecular weight alcohols, on the polyols was investigated by spectroscopic, chemical and physical methods. The viscosities, viscous-flow activation energies, molecular weight and melting point of the samples increased in the following order: polyol (3) > polyol (2) > polyol (1) > ESO [polyol (1); polyol (2) and polyol (3) represented the samples synthesized from the same epoxidized soybean oil generated by opening reactions with methanol, 1,2-ethanediol and 1,2-propanediol, respectively]. All the samples were crystalline solids below their melting temperature, displaying multiple melting point peaks. Compared with polyol (1), polyol (2) had a primary hydroxyl group, promoting the reactive activity of the polyol with isocyanates; polyol (3) contained large numbers of hydroxy groups, improving the properties of polyurethanes.