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51.
Yuhong Zhang Bo Wang Mingming Dai Shanshan Pan Fei Zhang Peixin He 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(5):409-415
The 2-acrylamido -2-methylpropane sulfonic acid (AMPS) was used as a reactive comonomer for the methyl methacrylate (MMA), n-butyl acrylate (BA) and 2-hydroxyethyl acrylate (HEA) emulsifier-free emulsion copolymerization system to obtain latices of stable and high-solid content (50 wt%).The polymerization and storage process is very stable, and the emulsion could store at room temperature for more than six months with the addition of AMPS. Properties of the latices, such as stability, flow behavior, particles diameter and morphology were studied. In addition, physical properties of the obtained copolymers, such as water resistance, glass transition temperature (Tg) were also investigated. The final size of the latex particles is 200~300 nm in diameter. Compared with the copolymers that were prepared by surfactant emulsion polymerization water resistance is greatly improved. 相似文献
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锆—7—(1—苯偶氮)—8—羟基喹啉—5—磺酸—Triton X—100荧光熄灭法测定锆 总被引:3,自引:1,他引:2
基于在pH=4.5~5.5、TritonX-100存在下、锆同7-(1-苯偶氮)-8-羟基喹啉-5-磺酸形成组成比为1:3的黄色络合物使荧光熄灭,建立了荧光熄灭测定锆的新方法。该方法的线性范围为0~28μgZrO2/L,检测限为0.5μg/L,体系稳定,灵敏度高,用于α-βAl2O3及瓷釉中锆的测定,结果满意。 相似文献
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考虑响应变量随机缺失下的变系数部分线性模型的估计问题,利用构造基于借补值的辅助随机向量,给出了参数分量的借补经验对数似然比函数.证明了其渐近服从标准卡方分布,进而给出了参数分量的置信域. 相似文献
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We establish the global existence and uniqueness of classical solutions to the Cauchy problem for the 3-D compressible Navier-Stokes equations under the assumption that the initial density ρ0 L∞ is appropriate small and 1 < γ < 65.Here the initial density could have vacuum and we do not require that the initial energy is small. 相似文献
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Jiayi Chen Peixin Cui Guoqiang Zhao Kun Rui Mengmeng Lao Yaping Chen Xusheng Zheng Yinzhu Jiang Hongge Pan Shi Xue Dou Wenping Sun 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(36):12670-12674
Highly active and durable electrocatalysts for the oxygen evolution reaction (OER) is greatly desired. Iridium oxide/graphitic carbon nitride (IrO2/GCN) heterostructures are designed with low‐coordinate IrO2 nanoparticles (NPs) confined on superhydrophilic highly stable GCN nanosheets for efficient acidic OER. The GCN nanosheets not only ensure the homogeneous distribution and confinement of IrO2 NPs but also endows the heterostructured catalyst system with a superhydrophilic surface, which can maximize the exposure of active sites and promotes mass diffusion. The coordination number of Ir atoms is decreased owing to the strong interaction between IrO2 and GCN, leading to lattice strain and increment of electron density around Ir sites and hence modulating the attachment between the catalyst and reaction intermediates. The optimized IrO2/GCN heterostructure delivers not only by far the highest mass activity among the reported IrO2‐based catalysts but also decent durability. 相似文献
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作为功能材料的一个新品种,高分子固体电解质有极其广泛的应用前景[1]。近年来人们致力于对体系的改性研究[2-5],以提高电解质的室温离子电导率和获得适合的力学性能。本研究用水溶液聚合工艺,以过硫酸盐为引发剂,以丙烯酸为主单体、丙烯酰胺为第二单体,加入适当的增塑剂... 相似文献
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Qi Yu Briana Aguila Jia Gao Peixin Xu Qizhe Chen Jie Yan Dong Xing Prof. Yao Chen Prof. Peng Cheng Prof. Zhenjie Zhang Prof. Shengqian Ma 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(22):5611-5622
Photomechanical molecular crystals are receiving much attention due to their efficient conversion of light into mechanical work and advantages including faster response time; higher Young's modulus; and ordered structure, as measured by single-crystal X-ray diffraction. Recently, various photomechanical crystals with different motions (contraction, expansion, bending, fragmentation, hopping, curling, and twisting) are appearing at the forefront of smart materials research. The photomechanical motions of these single crystals during irradiation are triggered by solid-state photochemical reactions and accompanied by phase transformation. This Minireview summarizes recent developments in growing research into photoresponsive molecular crystals. The basic mechanisms of different kinds of photomechanical materials are described in detail; recent advances in photomechanical crystals for promising applications as smart materials are also highlighted. 相似文献
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