Back‐channel‐etched thin‐film transistor using c‐axis‐aligned crystal In–Ga–Zn oxide

Our crystalline In–Ga–Zn oxide (IGZO) thin film has a c‐axis‐aligned crystal (CAAC) structure and maintains crystallinity even on an amorphous base layer. Although the crystal has c‐axis alignment, its a‐axis and b‐axis have random arrangement; moreover, a clear grain boundary is not observed. We fabricated a back‐channel‐etched thin‐film transistor (TFT) using the CAAC‐IGZO film. Using the CAAC‐IGZO film, more stable TFT characteristics, even with a short channel length, can be obtained, and the instability of the back channel, which is one of the biggest problems of IGZO TFTs, is solved. As a result, we improved the process of manufacturing back‐channel‐etched TFTs.     

γ‐Irradiation effects on the thermal and structural characteristics of modified,grafted polypropylene

The effects of both the degree of grafting and γ irradiation on the thermal stability and structural characteristic of polypropylene‐graft‐polyvinylpyrrolidone and polypropylene‐graft‐polyvinylpyrrolidone modified with α‐cyano‐δ‐(2‐thienyl) crotononitrile were investigated. The employed techniques were thermogravimetric analysis, differential thermogravimetry, and X‐ray diffraction. The thermal stability of various polymeric substrates was investigated through the determination of the degradation temperature and activation energy of degradation. The effects of different parameters on the structural characteristics of different films were investigated through the determination of possible changes in the degree of ordering of the polymeric substrates. The results revealed that the thermal stability of the trunk polymer, grafted polymer, and polymer modified by α‐cyano‐δ‐(2‐thienyl) crotononitrile increased progressively with an increasing degree of grafting. The increase was, however, more pronounced for the sample undergoing the lowest degree of grafting. The activation energy of the thermal degradation process remained almost unchanged, and this indicated that the degradation processes of the different films followed almost the same mechanism. The γ irradiation at a dose of 60 kGy of the sulfur‐treated polymeric films [i.e., the polymeric films treated with α‐cyano‐δ‐(2‐thienyl) crotononitrile] reduced their thermal stability. This conclusion was reached by the consideration of the changes observed in the pre‐exponential factor of the Arrhenius equation due to different chemical and γ‐irradiation treatments. The degree of ordering, evidenced by X‐ray diffraction measurements of the trunk polymer, grafted polymer, and modified polymer, suffered a significant drop. This drop was much more pronounced for the sulfur‐containing polymeric materials. The observed drop in the degree of ordering of the polymeric substrates was taken as a measure of the structure collapse due to a certain treatment (degree of grafting and sulfur inclusion). The γ irradiation of the sulfur‐containing polymeric materials greatly increased their degree of ordering, which reached a value greater than that measured for the trunk polymer. Therefore, it was concluded that the thermal stability increased as the degree of ordering decreased. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 506–515, 2006     

有机硅改性无皂丙烯酸酯类水分散体的合成技术及其产业化实践

介绍了以特殊结构的纳米无机体材料为骨架,采用无皂工艺合成的以有机硅材料进行改性的具有LIPN结构的丙烯酸酯类水分散体的性能及其产业化实践的情况,并对以该水分散体开发的水性木器涂料的性能作了对比说明。实践表明,以该丙烯酸水分散体开发的水性木器涂料较好地解决了目前水性木器涂料在硬度、光泽度、丰满度、回粘温度等方面不如溶剂型涂料的弱点,且该分散体的合成工艺独特、成本低廉,利于产业化和下游厂家开发使用。     

DaWson型磷钨钒杂多酸催化合成苹果酯的研究

制备了Dawson型磷钨钒杂多酸催化剂，用Fr—IR分析方法对催化剂进行了结构表征，并以乙酰乙酸乙酯与乙二醇为原料催化合成了苹果酯。实验结果表明，磷钨钒杂多酸是合成苹果酯的理想催化剂，其较优反应条件为：乙酰乙酸乙酯0．1 mol，n（乙酰乙酸乙酯）：n（乙二醇）=1．0：1．5，催化剂的用量为反应物总质量的1．5％，12mL甲苯，回流反应3．0h，苹果酯的收率可达83．0％以上。     

Pro／E软件在精密注射模具设计中的应用

利用三维软件进行设计代表了模具设计的发展方向,它有利于对模具进行实体造型、成型过程模拟以及模具缺陷检测分析的研究。在分析研究ProE进行精密注射模设计的基础上,介绍了应用Pro/Engineer2001进行模具设计的基本流程,应用软件中的一些功能对所设计的模具进行了检测分析,并通过一个具体的实例演示了该过程。     

Pore structure of bulk tungsten carbide powder catalysts

Bulk tungsten carbide catalysts are prepared by direct carburization/reduction of tungsten trioxide in methane-hydrogen mixtures. The catalytic properties of such catalysts have been studied by several authors. The porous structure of these catalysts is studied by adsorption of N₂, Kr, CF₄ and neohexane. Adsorption isotherms and hysteresis loops for the catalysts suggest the presence of a microporous structure made of parallel plates distant approximately by 20 Å. These results are compared to those obtained using such catalysts for hydrogen oxidation and where condensation in the porous structure was observed.     

高支化度酯类增塑剂的结构鉴定

利用AV50 0核磁共振波谱仪鉴定了一种从聚氨酯材料中分离出的增塑剂。这是一种新型的性能优良的耐迁移性脂肪族增塑剂。使用的手段有红外光谱 ,1 H NMR ,1 3C NMR ,1 3C 1 HCOSY ,1 H 1 HCOSY以及DEPT等技术。     

多层结构隐身涂层附着力测试探讨

优选了多层结构隐身涂层附着力的测定方法,研究了多层结构隐身涂层在自然环境中附着力的变化规律,指出了树脂耐低温和耐温变的重要性。     

Reactivity,chemical structure,and molecular mobility of urea–formaldehyde adhesives synthesized under different conditions using FTIR and solid‐state 13C CP/MAS NMR spectroscopy

This study was conducted to investigate the effects of reaction pH condition and hardener type on the reactivity, chemical structure, and molecular mobility of urea–formaldehyde (UF) resins. Three different reaction pH conditions, such as alkaline (7.5), weak acid (4.5), and strong acid (1.0), were used to synthesize UF resins, which were cured by adding four different hardeners (ammonium chloride, ammonium sulfate, ammonium citrate, and zinc nitrate) to measure gel time as the reactivity. FTIR and ¹³C‐NMR spectroscopies were used to study the chemical structure of the resin prepared under three different reaction pH conditions. The gel time of UF resins decreased with an increase in the amount of ammonium chloride, ammonium sulfate, and ammonium citrate added in the resins, whereas the gel time increased when zinc nitrate was added. Both FTIR and ¹³C‐NMR spectroscopies showed that the strong reaction pH condition produced uronic structures in UF resin, whereas both alkaline and weak‐acid conditions produced quite similar chemical species in the resins. The proton rotating‐frame spin–lattice relaxation time (T_1ρH) decreased with a decrease in the reaction pH of UF resin. This result indicates that the molecular mobility of UF resin increases with a decrease in the reaction pH used during its synthesis. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2677–2687, 2003     

石莼基微/中孔复合结构活性炭的制备及性能

以海洋海藻废弃物石莼为原料,通过热解预炭化,KOH活化制备活性炭。以碘吸附值和亚甲基蓝吸附值为吸附性能评价指标,探究了活化工艺对活性炭吸附性能的影响。结果表明,当KOH与石莼半焦质量比(碱炭比)为3.0∶1.0、活化时间为45 min、活化温度为800℃时,活性炭吸附性能最优,其碘吸附值和亚甲基蓝吸附值最大,分别为1824.19 mg/g、914.98 mg/g。FTIR测试表明,活性炭含有大量羟基等官能团。SEM测试表明,活性炭表面粗糙、存在大量孔结构。活性炭的BET比表面积为2616.3 m2/g,Langmuir比表面积高达4883.5 m2/g,平均孔径为2.73 nm。石莼基活性炭的孔结构为微/中孔复合结构,有作为储能、环保材料的潜质。