采用石墨电极制备多孔硅工艺研究

采用石墨电极作为阴极,通过向腐蚀溶液中添加适量65％(质量分数wt％,下同)浓硝酸,以电化学腐蚀法在单晶硅片表面制备出多孔硅微结构.实验表明,随着腐蚀时间的增加,衡量多孔硅表面形貌的粗糙度和颗粒度指标值呈周期性增减变化;在电流密度为10 mA/cm2的阳极腐蚀参数下,将单晶硅片腐蚀1875秒制备的多孔硅样品的粗糙度和颗粒度值相对较大,原子力显微镜(AFM)和扫描电子显微镜(SEM)检测结果表明其硅柱最大高度、颗粒最大直径和平均直径分别达到470 nm、1693.590nm、489.954nm.     

提高纸塑复合袋剥离力的有效途径

针对纸塑复合袋剥离力对产品质量的影响，从原料、生产工艺等方面分析了影响纸塑复合袋剥离力的因素，如树脂的氧化程度不够、涂覆树脂不合适、基材粗糙度不够等，进而指出了提高剥离力的有效途径．即让树脂得到充分氧化、对涂覆树脂进行改性、对编织布和牛皮纸进行电晕处理等。     

气-质联用法检测韭菜中香味成分的研究

运用GC／MS条件,研究了韭叶石油醚提取物及氯仿提取物的化学成分,共发现10种含硫化合物,其中4种化合物首次从该植物中找到。其中主要香味成分为甲基硫代亚磺酸甲酯,通过仿生合成和探讨其波谱性质验证了其结构。     

桠柑皮香精油的提取工艺及成分鉴定

本文采用改进的同时水蒸气蒸馏与萃取法从桠柑皮中提取香精油,经气相色谱-质谱联用（GC-MS）分析鉴定了香精油的化学成分,共分离出73个组分,鉴定了柠檬烯、α-萜品烯、α-月桂烯、α-蒎烯等25个百分含量较高的化合物。     

CO2超临界萃取技术提取沙田柚皮的研究

采用沙田柚皮作为实验材料 ,研究在CO2 超临界流体萃取时 ,粉碎度、温度、压力、萃取时间等条件对精油萃取率的影响 ,得到萃取沙田柚皮精油的最佳条件为 13MPa ,4 0℃ ,萃取时间 1h ,为批量生产提供了依据     

陈皮浸膏热裂解产物分析及其在卷烟中的应用

运用快速溶剂萃取提取陈皮,浓缩得陈皮浸膏。采用热裂解-气相色谱/质谱联用技术(Py-GC/MS),在300,450,600,750,900℃下分析其热裂解产物,陈皮浸膏在600℃以下裂解产物主要是醛类、酮类、酯类和呋喃类物质;在600℃以上,检测到对人体有害物质,如对二甲苯。卷烟加香实验表明:陈皮浸膏在烟丝中的添加量适宜控制在0.03%~0.05%,药香与烟香协调性较好,刺激性降低。     

石榴皮抑菌活性物质的初步研究

研究了石榴皮初提物对黄瓜枯萎病菌的室内生物活性.结果表明:在甲醇、氯仿及正己烷提取物中,甲醇提取物的抑菌活性最为显著.采用生长速率法和孢子萌发法测定了石榴皮溶剂萃取物对黄瓜枯萎病菌、番茄灰霉病菌、玉米小斑病菌和棉花立枯病菌等4种病原菌的生物活性.在甲醇提取物的石油醚、氯仿、乙酸乙酯及正丁醇萃取物中,以正丁醇萃取物的抑菌活性最强,在质量浓度为200 g/L时.对4种供试真菌的抑制率均大于70%,而对玉米小斑菌的抑制作用达90.67%,其EC50值为26.2 g/L.     

ESTA喷涂机与机器人喷涂对油漆车身外观NAP值的影响

介绍传统喷涂机与机器人喷涂设备对面漆NAP值的影响与对比。     

等离子体处理条件对聚酰亚胺薄膜表面处理效果的影响

采用氧气等离子体对聚酰亚胺薄膜进行表面处理,系统研究了等离子体处理时间、压强和功率对处理效果的影响,并对比了空气、氮气、氧气和氩气几种处理气氛的处理效果,得出了最佳处理条件。分析表明:聚酰亚胺薄膜经氧气等离子体处理后,表面引入了含氧极性基团,有明显的刻蚀现象,使得其亲水性增强,与铜箔复合的剥离强度提高。     

Evaluation and simulation of the peel behavior of polyethylene/polybutene‐1 peel systems

The peel characteristics of sealed low‐density polyethylene/isotactic polybutene‐1 (PE‐LD/iPB‐1) films, with different contents of iPB‐1 up to 20 m.‐% (mass percentage), were evaluated and simulated in dependence on the iPB‐1 content, and in dependence on the peel rate. Sealing involves close contact and localized melting of two films for a few seconds. The required force, to separate the local adhered films, is the peel force, which is influenced, among others, by the content of iPB‐1. The peel force decreases exponentially with increasing iPB‐1 content. Transmission electron microscopy studies reveal a favorable dispersion of the iPB‐1 particles within the seal area, for iPB‐1 concentrations ≥6 m.‐%. Here, the iPB‐1 particles form continuous belt‐like structures, which lead to a stable and reproducible peel process. The investigation of the peel rate‐dependency on the peel characteristics is of important interest for practical applications. The peel force increases with increasing peel rate by an exponential law. A numerical simulation of the present material system proves to be useful to comprehend the peel process, and to understand the peel behavior in further detail. Peel tests of different peel samples were simulated, using a two‐dimensional finite element model, including cohesive zone elements. The established finite element model of the peel process was used to simulate the influence of the modulus of elasticity on the peel behavior. The peel force is independent of the modulus of elasticity, however, the peel initiation value increases with increasing modulus of elasticity. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009