水性含磷功能性聚合物的制备及应用

水性含磷功能性聚合物是一种环境友好材料,且具有阻燃、耐热、防腐、生物相容性好以及改善粘接性能等多种特性.本文介绍了水性含磷功能性聚合物的结构和制备方法,综述了其在粘合剂、涂料以及生物医用材料等方面的应用报道,并展望了其发展前景.     

Development of solvate ionic liquid immobilized MCM-41 ionogel electrolytes for lithium battery

Journal of Materials Science: Materials in Electronics - Compared to liquid electrolytes, solid electrolytes have shown better performance on safety requirements and energy densities. However, the...     

纳米碳酸钙对溶聚丁苯橡胶胶料的补强作用

探讨了纳米碳酸钙中白燕华ＣＣ对溶聚丁苯橡胶（ＳＳＢＲ）胶料的补强作用。结果表明,白燕华ＣＣ与Ｓ－ＳＢＲ的混炼加工工艺完全可行;单用白燕华ＣＣ作补强填料时,随着其用量的增大,ＳＳＢＲ胶料的硫化速度加快,性能显著提高,硬度变化不大;白燕华ＣＣ与ＨＡＦ并用具有协同作用。可使Ｓ－ＳＢＲ胶料的物理性能满足实际使用要求;白燕华ＣＣ／ＨＡＦ并用的Ｓ－ＳＢＲ／ＮＲ和Ｓ－ＳＢＲ／ＢＲ并用胶硫化速度较快,加工性能和物     

TCY／硫黄对ACM／NBR并用胶的交联作用

从混炼胶的硫化特性和硫化胶物理性能等方面考察了三聚硫氰酸（ＴＣＹ）、硫黄和ＴＣＹ／硫黄对丙烯酸酯橡胶（ＡＣＭ）、丁腈橡胶（ＮＢＲ）及其并用胶的交联作用。结果表明,ＴＣＹ／硫黄硫化体系适用于ＡＣＭ／ＮＢＲ并用胶、并用胶的物理性能达到甚至超过了两种胶料的物理性能的加和水平;ＡＣＭ／ＮＢＲ共混并用,加工性能得到明显改善     

聚苯胺对2,5-二巯基-1,3,4-噻二唑电化学性质的影响

采用循环伏安法研究了聚苯胺（PAn）对2，5－二巯基－1，3，4－噻二唑（DMcT）电化学性质的影响。结果表明，在含0．1mol/LLiClO4和1．0mol/LHCl的乙腈溶液中，DMcT在玻碳电极上呈现2对明显的氧化还原峰。在PAn膜电极上则呈现1对氧化还原峰，并且可以与PAn形成DMcT／PAn复合物，复合物电极呈现的氧化还原的峰电位差较玻碳电极明显减小。因此认为PAn可以较大程度地提高复合物的导电性和电荷传递速度，对DMcT的氧化还原反应有显著的催化作用。     

Boost DC-DC电路的启动性能分析

针对3个典型(单、双和三电感)升压电路的启动性能分析问题,应用PSIM仿真软件,调整3个重要影响参数(电感、电容和电流放大倍数),在获得稳定输出电压前提下,记录输出信号延迟和电路功耗的仿真数据,绘制三维图(电感/电容,电流放大倍数,延迟)和功耗延迟关系图,从中获得电路启动延迟性能和电路功耗折中考虑的最优区域。     

固定频率PWM芯片功率限制研究

固定频率AC-DC的PWM芯片广泛应用于低功率电源中,并一直是业界研究的热点技术。本文概论精确控制此类芯片的输出过功率的三种方法,(1)减小过流保护(Over Current Protecting,简称OCP)的延迟时间T_d,(2)调整OCP的电压阈值和(3)同时调整延迟时间和电压阈值,通过计算分析其优缺点,为芯片的OCP过功率设计提供了技术细节参考。     

Properties of functionalized graphene/room temperature vulcanized silicone rubber composites prepared by an In-situ reduction method

Functionalized graphene oxide (FGO) was prepared by treating graphene oxide with γ-aminopropyl triethoxysilane (KH-550) before the mixture was dispersed into α, ω-dihydroxy polydimethylsiloxane to get room temperature vulcanized (RTV) silicone rubber composites by solution casting. The cured composites were then reduced with hydrazine hydrate to obtain functionalized graphene (FG)/RTV silicone rubber composites. The structures of FGO and the resultant composites were characterized by atomic force microscopy, FT-IR spectra and X-ray diffraction. KH-550 was found to be grafted onto graphene sheets, leading to an increased interlayer spacing. Significant improvements in thermal and mechanical properties were obtained. Both the FGO/RTV silicone rubber composite contain 1.0 wt% of FGO, and its reduced product showed an increase of one-step weight loss temperature with 61 ℃ and 133 ℃ higher than that of pure silicone rubber. Tensile strength and elongation at break of FG/RTV silicone rubber composite (with 0.5 wt% FGO content) increased by 175% and 67%, respectively, compared with those of pure silicone rubber.     

聚硫橡胶／聚苯胺复合膜的电化学制备

将苯胺与液体聚硫橡胶置于同一电解液中，进行同步电化学氧化复合，得到了聚硫橡胶质量分数为４８％￣７１％的聚硫橡胶／聚苯胺复合膜。Ｘ射线能量散射谱对复合膜厚度方向上聚硫橡胶的分布分析表明，氧化复合初期，复合膜中聚硫橡胶含量逐步增大，随后保持稳定。复合膜的循环伏安分析表明，聚苯胺对聚硫橡胶的氧化还原反应有催化作用。     

Preparation of 2‐ethyl‐4‐methylimidazole derivatives as latent curing agents and their application in curing epoxy resin

Three kinds of 2‐ethyl‐4‐methylimidazole (EMI) derivatives (N‐acetyl EMI, N‐benzoyl EMI, and N‐benzenesulfonyl EMI) were synthesized through the reaction of EMI with acetyl chloride, benzoyl chloride, and benzenesulfonyl chloride, respectively. And the structure was confirmed by Fourier transform infrared spectroscopy (FTIR) and ¹H‐nuclear magnetic resonance spectroscopy (¹H NMR) spectra. Furthermore, the synthesized EMI derivatives were applied in diglycidyl ether of bisphenol A epoxy resin (DGEBA) as latent curing agent. Differential scanning calorimeter (DSC) was used to analyze the curing behavior of DGEBA/EMI derivative systems, indicating DGEBA could be efficiently cured by the EMI derivatives at 110～160°C, and the corresponding curing activation energy ranged from 71 to 86 kJ/mol. Viscosity data proves that the storage life of DGEBA with N‐acetyl EMI (NAEMI), N‐benzoyl EMI (NBEMI), and N‐benzenesulfonyl EMI (NBSEMI) at room temperature was 38 d, 50 d, and 80 d, and that at 10°C was 90 d, 115 d, and 170 d, respectively. Besides, thermogravimetry (TG), izod impact strength (IIS), and tensile shear strength (TSS) were tested to characterize the thermal stability and mechanical properties of DGEBA cured by EMI derivatives. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42563.