Synthesis and photoconductivity study of azo functional polymers

A new type of high photosensitive azo functional polymers was synthesized and characterized by viscometry, infrared (IR) spectroscopy and Raman spectroscopy. Xerographic properties were determined in bilayer devices. Results show that azo polymers have high photosensitivity resulting from the high electronic mobility (AP-1 and AP-3) and a high charge transfer (AP-4). The study of spectral responses indicates that these polymers exhibit good xerographic properties in visible region, and AP-1 also has high photosensitivity in the near-IR region. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 1913–1920, 1999     

Photochemical-induced polymerization kinetics of styrene and methyl methacrylate by initiation of binary system composed of polyethylene oxide with aniline end group and benzophenone

The kinetics of photochemical polymerization of styrene (St) and methyl methacrylate (MMA) using a binary initiation system composed of poly(ethylene oxide) with an aniline end group (PEO_a) and benzophenone (BP) was investigated by a modified dilatometer. The effect of the concentration of the monomer, BP and PEO_a, and of the molecular weight of PEO_a on the polymerization rate (R_p) and conversion of monomers is discussed in detail. The formulas of R_p ∝︁ [PEO_a]^0.38 [St]^0.33 [BP]^0.56 and R_p ∝︁ [PEO_a]^0.36 [MMA]^0.30 [BP]^0.54 using benzene as a solvent are derived when the molecular weight of PEO is 11,000 (PEO_a — 11,000). Compared with the small aminophenol (AP), there existed a critical PEO_a concentration to affect the R_p and conversion of the monomers and the critical concentration is strongly dependent on the polarity of the solvents and molecular weight of PEO_a. It is confirmed that in the same conditions the solution polymerization behavior of St and MMA initiated by the imino radical of PEO would not be affected by the properties of the second block although PMMA is miscible and PS is immiscible with PEO_a in the bulk. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 2095–2103, 1997     

碱性染料与磷钨酸形成的新型电荷转移盐的制备与表征

报道了用Keggin结构的磷钨酸与碱性染料结晶紫、碱性藏红T和碱性湖兰BB反应形成的3种新型电荷转移盐。利用元素分析、差热-热重、变温红外、固体漫反射电子光谱对标题化合物的组成、热稳定性和光学性质进行了表征。     

Preparation and characterization of polymer composites based on charge-transfer complex of phenothiazine-iodine in polystyrene

Polymer composites based on charge-transfer complex of phenothiazine and iodine with polystyrene have been prepared in different weight ratios and characterized by FTIR, XRD, mechanical, microstructure and electrical properties (d.c. as well as a.c.). These composites show semiconducting behaviour as the conductivity increases with increasing temperature. Low percolation threshold (10% wt CTC) has been found indicating that processable conducting polymers with improved mechanical properties can be prepared by this method.     

应用电荷转移感测技术实现平板电视触控按键

本文主要介绍电荷转移感测技术、利用电荷转移感测技术设计平板电视触控按键以及设计过程中的难点及注意事项。     

Novel Deep-Blue Hybridized Local and Charge-Transfer Host Emitter for High-Quality Fluorescence/Phosphor Hybrid Quasi-White Organic Light-Emitting Diode

A new hybrid local and charge transfer (HLCT) molecule 2TPA-PPI is obtained for constructing the high-performance organic light-emitting diodes (OLEDs) in this work. 2TPA-PPI possesses the sufficient emission/charge-transporting properties, thus it is used as a neat emitter achieving an efficient deep-blue OLED with very high external quantum efficiency (EQE) up to 10.7%, as well as a multi-functional emitting host matrix constructing the high-performance phosphorescent OLEDs. More importantly, a high-efficiency candle light-style OLED adopting the HLCT/phosphor hybrid strategy is realized, where 2TPA-PPI acts as not only a blue emitter, but also a universal host sensitizing both yellow and red phosphors. This quasi-white OLED represents almost the highest EQE/PE level of 25.2%/49.7 lm W⁻¹ at the practical luminance level of 1000 cd m⁻² for the white OLEDs with the excellent color rendering index values of more than 80 reported.     

卟啉非线性光学材料研究进展

卟啉作为非线性光学材料的潜在应用受到了人们的关注。介绍了卟啉作为非线性光学材料的研究现状 ,同时综述了卟啉非线性光学材料的分子设计、结构与性能的关系 ,并展望了其应用前景。     

一种适用于100 Gbit/s以太网PCS的高速异步FIFO

采用0.18 μm CMOS工艺设计和实现了一种适用于100 Gbit/s以太网PCS链路的高速异步FIFO 芯片。采用双端口8T结构替代存储器,提高了工作速率。灵敏放大器利用锁存放大器和预充电技术来放大位线上微小信号,减少了传播延迟。为了减小读写时间,研究了存储单元晶体管尺寸对电平翻转时间的影响,既满足了快速访问的要求,又获得了高可靠性的信号传输。芯片(包括焊盘)面积为1.43 mm²。测量结果表明,该FIFO可工作于1.05 GHz,输出信号的眼图清晰,水平张开度达到0.91UI。当电源电压为1.8 V时,电路功耗为143.3 mW。该FIFO适用于16×6.25 Gbit/s以太网PCS链路系统。     

自由基交替共聚合动力学模型的定量处理

提出了不依赖于链终止反应控制方式和链终止机理的有电子转移络合物(CTC)参加聚合的交替共聚合动力学模型的数学处理方法，该处理方法中不存在近似假设，通用于各种交替共聚动力学模型的定量处理．新的处理方法可以在不考虑具体动力学模型的情况下定量描述CTC参与共聚合的比例，求取竞聚率参数r12、r21、r1c和r2c。     

External stimuli controlled multiferroic charge-transfer crystals

Multiferroic charge-transfer crystals have drawn significant interest due to their simultaneous dipolar and spin ordering. Numerous theoretical and experimental studies have shown that the molecular stacking between donor and acceptor complexes plays an important role in tuning charge-transfer enabled multifunctionality. Herein, we show that the charge-transfer interactions can be controlled by the segregated stack, consisting of polythiophene donor- and fullerene acceptor-based all-conjugated block copolymers. Room temperature magnetic field effects, ferroelectricity, and anisotropic magnetism are observed in charge-transfer crystals, which can be further controlled by photoexcitation and charge doping. Furthermore, the charge-transfer segregated stack crystals demonstrate external stimuli controlled polarization and magnetization, which opens up their multifunctional applications for all-organic multiferroics.

Open image in new window