CF4预处理后热生长薄栅氧漏电流及势垒研究

嵌入式Flash Memory要求低的工作电压．采用反应离子刻蚀技术，用CF4气体在低功率下对硅片做预处理，再热生长薄氧化层，从而在氧化层中引入F，降低氧化层势垒:势垒高度从3.05eV降低到2.5eV，隧穿电流增加，从而可以在低压下提高Flash Memory的编程效率．     

Preparation of light-responsive block copolymer modified cellulose nanocrystal@polydopamine particle and its application in fluorinated polyacrylate film

Light-responsive cellulose nanocrystal@polydopamine (CNC@PDA) modified fluorinated polyacrylate was synthesized by Pickering emulsion polymerization with light-responsive block copolymer modified CNC@PDA as stabilizer. The epoxy groups in poly(acrylic acid-co-acrylamide)-b-poly(glycidyl methacrylate)-b-poly(hexafluorobutyl acrylate-co-coumarin) amphiphilic triblock copolymer reacted with the hydroxyl and amino groups on the surface of CNC@PDA to form the modified CNC@PDA. The successful preparation of modified CNC@PDA was confirmed by means of FT-IR, XRD, TG, UV–Vis, surface tension measurement, and X-ray photoelectron spectroscopy (XPS) techniques. The results showed that the modified CNC@PDA had light-responsive and amphiphilic properties, and could be used as stabilizer to form stable Pickering emulsion. And the influence of modified CNC@PDA dosage on emulsion polymerization and film performance was systematically studied. The latex particle size decreased initially with increasing modified CNC@PDA dosage, from 0.6 to 1.0 wt%, and then increased. The mechanical, self-healing, and water–oil repellent properties of film were enhanced initially with increasing modified CNC@PDA dosage, from 0.6 to 1.0 wt%, and then declined. Atomic force microscope confirmed that the latex film had a rough surface. Moreover, the latex film comprising 1.0 wt% modified CNC@PDA presented not only high tensile strength (4.92 MPa), large elongation at break (657.70%), and superior oil/water repellency but also excellent self-healing property.     

A Study on Optical Emission of CF4＋CH4 Plasma and Deposition Mechanisms of a-C ： F, H Films

Fluorinated amorphous carbon (a-C : F, H) films were deposited by inductively coupled plasma using CH4 and CF4 gases. Actinometrical optical emission spectroscopy (AOES) was used to determine the relative concentrations of various radicals, CF, CF2 CH, C2, H and F, in the plasma as a function of gas flow ratio R, R=[CH4]/([CH4] [CF4]). The structural evolution of the films were characterized by Fourier transform infrared transmission (FTIR) spectroscopy. The relationship between the film deposition and the precursor radicals in the plasma was discussed. It was shown that CH radical, as well as CF, CF2, C2 radicals are of the precursors, contributing to a-C : F, H film growth.     

氨基化氟化石墨烯增强热塑性聚氨酯的制备与性能研究

目的 制备氨基化氟化石墨烯/热塑性聚氨酯复合材料,进一步提升热塑性聚氨酯(TPU)的综合性能。方法 通过亲核取代反应将尿素分子修饰在氟化石墨烯(FG)表面,得到氨基化氟化石墨烯(AFG)。将AFG作为填料与TPU复合,得到不同质量浓度的氨基化氟化石墨烯/热塑性聚氨酯(AFG/TPU)复合薄膜。通过SEM、TEM、AFM、XPS、XRD、Raman对FG、AFG粉末和AFG/TPU复合薄膜进行表征,使用万能材料试验机、多功能摩擦磨损试验机对AFG/TPU复合薄膜进行力学、摩擦学性能测试。结果 经过尿素分子与FG表面的C—F亲核取代反应,得到表面氨基化的AFG,使AFG片层表面不仅有大量的氟元素,而且有能与TPU分子链形成氢键作用力的氨基官能团,从而保证了AFG可均匀分散于TPU基体中。3.25-AFG/TPU复合材料的拉伸强度为5.97 MPa,较3.25-FG/TPU复合薄膜的拉伸强度(4.37 MPa)增加了36.6%,较纯TPU的拉伸强度(2.51 MPa)增加了137.8%。纯TPU磨损体积为0.56 mm³,3.25-FG/TPU复合材料的磨损体积为0.42 mm³,较纯TPU减小了25%;3.25-AFG/TPU复合材料的磨损体积为0.18 mm³,较纯TPU减小了67.8%。3.25-AFG/TPU复合薄膜的磨损率为1.67×10^–2 mm³/(N.m),较TPU的磨损率(5.18×10^–2 mm³.N^–1.m^–1)降低了67.8%。结论 当FG和AFG分别作为纳米填料时,发现3.25-AFG/TPU力学性能和摩擦学性能均优于3.25-FG/TPU,这是因为AFG不仅保持了FG良好的分散性,使得其可以均匀分散在TPU基体中,而且表面氨基更赋予了AFG与TPU分子链形成氢键作用力的能力,使得拉伸应力和摩擦剪切力可以通过TPU分子链传递到AFG纳米材料表面,最终有效增强了TPU的抗拉伸强度和耐磨损性能。复合材料拉伸断面的微观形貌分析表明,应力可以从TPU分子链传递到AFG表面,AFG起到了分散应力的作用。磨损表面分析表明,TPU和AFG/TPU复合薄膜的磨损机制主要为疲劳磨损。因此,AFG增强AFG与TPU界面的相互作用,最终增强了TPU的力学性能和摩擦学性能。     

阳离子含氟PUA表面施胶剂的制备及应用

为制备一种能够明显提高纸张施胶效果和印刷性能的聚合物表面施胶剂,以2,2,3,4,4,4-六氟丁醇甲基丙烯酸酯(FA)、苯乙烯(St)、丙烯酸丁酯(BA)为单体,在交联聚氨酯溶液(PU)中通过溶液聚合相转化法制得阳离子含氟聚氨酯-丙烯酸酯复合乳液(FPUA)表面施胶剂.用FT-IR、TEM和纸张物理性能检测的手段对聚合物结构、乳胶粒子形态以及应用性能进行了表征.实验结果表明,以质量分数为1.0%的FPUA进行表面施胶时,可使纸张的施胶度和拉毛速率分别达到9.50 s和2.80 m/s以上,油墨吸收率为26.0%～29.0%;乳胶粒子呈球形,其粒径约为230nm.     

智能复合材料光纤传感层的研究

光纤自诊断系统是智能复合材料结构的重要组成部分。但是 ,将光纤传感器阵列埋入复合材料是实现智能复合材料的一个难题。解决这一问题的方法是将光纤传感器集成在一起形成一个模块化的便于埋入复合材料中的光纤传感层。本文探讨两种使用聚酰亚胺制作传感层的方法。一种是把光纤传感器阵列埋入聚酰亚胺薄膜中 ;另一种是用作为光学材料的含氟聚酰亚胺制作矩形 (道沟 )光波导和光传感器。后一种方法制作的传感器模块集成度高、可靠性好 ,是值得注意的发展方向。     

三氟甲基化反应的研究进展

综述了三氟甲基化反应的研究进展,包括自由基取代、卤素置换、亲核取代和亲电取代以及5种加成方法,展望了三氟甲基化反应的前景。     

The interaction between co-polymer of vinylpyrrolidone and vinylacetate and anionic surfactants in aqueous solutions

The interaction of co-polymers of vinylpyrrolidone-vinylacetate with anionic surfactants, such as lithium dodecyl sulfate (LiDS), lithium perfluorooctane sulfonate (LiFOS) in aqueous solution, has been studied. When the content of vinylacetate in the co-polymers increases, reduction in the surface tension of co-polymers alone becomes significant. In mixtures of co-polymers and surfactants, co-polymer-LiFOS complexes are formed at lower surfactant concentration than that of co-polymer-LiDS. The micropolarity of the co-polymers-surfactant complexes depends on the composition of co-polymers and is higher for co-polymer-LiFOS than that for co-polymer-LiDS. Further, the solubilization behavior of α-(o-tolylazo-)-β-naphthylamine (Yellow OB) (Tokyo Kasei Co., Ltd., Tokyo, Japan) in the co-polymer-surfactant complexes is almost independent of the co-polymer composition, but different from the surfactants, where a very low solubilized amount of Yellow OB is observed for co-polymer-LiFOS.     

VLSI用低介电常数含氟碳膜研究

用等离子体增强化学气相沉积(PECVD)法制备了不同工艺条件下的含氟碳膜。测量了薄膜的厚度和介电常数,并用傅立叶红外光谱分析了薄膜化学结构,发现薄膜成分和介电性与沉积工艺密切相关,对薄膜的SEM分析表明所得薄膜均匀致密。控制适当的工艺条件,可沉积理想的超大规模集成电路(VLSI)用钝化膜。     

Hydrophobic surface properties of fluoropolyetherimide blends for pervaporation membranes

The well‐known polyetherimide (ULTEM 1000) is obtained by step‐reaction of bisphenol. A diphthalic anhydride (BAPA) with m‐phenylene diamine and newly related fluorinated poly etherimides synthesized from BAPA and 2,3‐bis(2,2,3,3,4,4,5,5,5‐nonafluoropentyl)butan‐1,4 diamine (NFD) led to compatible blends over the entire range of composition. Miscible one‐phase blends have been suggested by a good correlation of T_g versus NFD monomer unit weight fraction (w) (Fox and Couchman equations) and a regular morphology by scanning electron microscopy. Surface energy of blend films fell from 45.3 to 27.4 mJ m^?2 for w ≥ 0.1 corresponding to a NFD molar fraction y ≥ 0.06. Cast‐evaporated films from fluorinated copolyetherimides and blends with y < 0.15 were ductile and gave conveniently hydrophobic non‐porous membranes that withstood the experimental conditions of pervaporation tests. Copyright © 2003 Society of Chemical Industry