紫外线辐照HDPE／PA6共混物界面相互作用的研究

采用ＥＳＣＡ、Ｍｏｌａｕ实验、ＳＥＭ、ＤＳＣ、ＤＭＡ、抽滤分析、ＦＴ－ＩＲ和拉抻应力－应弯曲线，研究了紫外线辐照ＨＤＰＥ／ＰＡ６共混物的界面相互作用机理。结果表明，紫外线辐照下，ＨＤＰＥ分子链上引入Ｃ＝Ｏ、ＣＯＯＨ、－ＯＨ、－ＯＯＨ、－Ｃ－Ｏ－等极性基因；在与ＰＡ６熔融共混过程中， 的Ｃ＝Ｏ、ＣＯＯＨ等基团与ＰＡ６分子我寂的酰胺基或端胺基发生化学反应，生成ＨＤＰＥ－ＰＡ６共聚物。共聚物的形成增强了     

电子束辐照对HDPE及其与Mg(OH)_2共混体系力学性能影响的研究EI

研究了高密度聚乙烯（ＨＤＰＥ）经电子束辐照后性能的变化，与Ｍｇ（ＯＨ）２的相容性，以及ＨＤＰＥ／Ｍｇ（ＯＨ）２共混体系的力学性能。实验结果表明，经电子束辐照后，ＨＤＰＥ分子被引入了极性基团（羰基），增加了ＨＤＰＥ与Ｍｇ（ＯＨ）２的相容性，使ＨＤＰＥ／Ｍｇ（ＯＨ）２体系的拉伸强度得到提高。     

电子束辐照对HDPE及其与Mg(OH)_2共混体系力学性能影响的研究

研究了高密度聚乙烯（ＨＤＰＥ）经电子束辐照后性能的变化，与Ｍｇ（ＯＨ）２的相容性，以及ＨＤＰＥ／Ｍｇ（ＯＨ）２共混体系的力学性能。实验结果表明，经电子束辐照后，ＨＤＰＥ分子被引入了极性基团（羰基），增加了ＨＤＰＥ与Ｍｇ（ＯＨ）２的相容性，使ＨＤＰＥ／Ｍｇ（ＯＨ）２体系的拉伸强度得到提高。     

紫外线辐照对HDPE结晶结构及化学结构的影响

采用ＤＳＣ、ＷＡＸＤ、元素分析、ＦＴ－ＩＲ、ＥＳＣＡ、ＧＰＣ、交联度和密度测定，研究了紫外线辐照了ＨＤＰＥ的结晶结构及化学结构变化。结果表明，紫外线辐照后，ＨＤＰＥ的熔融温度降低、熔融热焓升高、结晶度增大、晶胞结构未发生变化；ＨＤＰＥ分子甸主了ＣＯＯＨ、Ｃ＝Ｏ、Ｃ－Ｏ、ＯＯＨ、ＯＨ等含氧官能团，分子量降低，分子量分布加宽，基本无交联发生。     

紫外线辐照HDPE\PVA短纤维共混物相容性及力学性能的研究

采用接触角测定、ＳＥＭ、抽滤分析和力学性能的测试研究了紫外线辐照ＨＤＰＥ＼ＰＶＡ短纤维共混物的力学性能和相容性。结果表明，经紫外线辐照后，由于在分子链上引入了＞Ｃ＝Ｏ、－ＣＯＯＨ、－ＯＨ等极性基团，ＨＤＰＥ与水的接触角变小，亲水性增加。在与ＰＶＡ短纤维共混过程中，ＨＤＰＥ分子链上引入的含氧基团与ＰＶＡ分子链上－ＯＨ基团形成氢键，增强了共混体系相界面相互作用，使共混物的拉伸强度和冲击强度得到了明显提高。当辐照时间超过１４４ｈ，由于ＨＤＰＥ降解严重，共混物的韧性突降。     

紫舛线辐照HDPE／PVA短纤维共混物相容性及力学性能的 …

采用接触角测定、ＳＥＭ、抽滤分析和力学性能的测试研究了紫外线辐照ＨＤＰＥ／ＰＶＡ短纤维共混物的力学性能和相容性。结果表明，经紫外线辐照后，由于在分子链上引入了〉Ｃ＝Ｏ、－ＣＯＯＨ、－ＯＨ等极性基团，ＨＤＰＥ与水的接触角度小，亲水性增加。在与ＰＶＡ短纤维共混过程中，ＨＤＰＥ分子链上引入的含氧基团与ＰＶＡ分子链上－ＯＨ基团形成氢键，增强了共混体系相界面相互作用，使共混物的拉伸强度和冲击强度得到了明显提     

SRS 3D家庭音效处理器

ＳＲＳ３Ｄ家庭音效处理器田卫ＳＲＳ３Ｄ系统原理本文向大家介绍一款新颖的ＳＵＰＥＲＨＳＥＰ－Ａ型ＳＲＳ３Ｄ家庭音效处理器。ＨＳＥＰ是英文ＨＯＭＥＳＯＵＮＤＥＦＴＴＥＣＴＰＲＯＣＥＳＳＯＲ（家庭音效处理器）的缩写。ＨＳＥＰ具有系统成本低、环绕效果明显、功...     

零ODP发泡剂聚氨酯泡沫工业进展

零ＯＤＰ发泡剂聚氨酯泡沫工业进展刘益军编译聚氨酯泡沫（ＰＵ）的发泡剂向低臭氧消耗潜值（ＯＤＰ）的氢氯氟烃（ＨＣＦＣ）转化还不到１０年时间，现在又开始向零ＯＤＰ的发泡剂发展。在ＰＵ硬泡及聚异氰脲酸酯（ＰＩＲ）泡沫生产中废除ＨＣＦＣ１４１ｂ的期限是２０...     

紫外线辐照HDPE与尼龙－6相容性的研究

采用ＩＲ、ＳＥＭ、ＤＳＣ和拉伸应力－应变曲线研究了紫外线辐照ＨＤＰＥ／ＰＡ６的相容性，结果表明，随紫外线辐照时间的增长，ＨＤＰＥ分子链上引入Ｃ＝Ｏ－Ｃ－Ｏ－等极性基团明显增加；ＰＡ６的粒径减小，与基体间界面作用加强；两组分玻璃化温度差（Ｔ_（ｇ，ＰＡ６）－Ｔ_（ｇ，ＨＤＰＥ））减小；共混物拉伸应力－应变曲线上出现屈服点及拉伸冷流塑性形变。当辐照时间达１４４ｈ后，由于ＨＤＰＥ热稳定性明显变差，共混物韧性突降，拉伸应力－应变曲线上未出现屈服点。     

PET熔融双峰的模拟分析

依据ＤＳＣ升温过程中会同时发生熔融，重结晶，利用只有１个最大值的初始晶体熔点分布函数和结晶生长速率函数建立了ＰＥＴ的ＤＳＣ过程模型，计算了模拟ＨＯＬＤＳＷＯＲＴＨ的３组实验结果。理论曲线和实验曲线较好的吻合说明ＰＥＴ熔融双峰起因于初始晶体的熔融，重结晶和再熔融。     

PPV类电致发光聚合物的合成及分子设计研究

PPV类电致发光聚合物以其优良的光电性能在微电子及显示领域中得到了广泛的应用,是当今材料科学研究的热点之一.综述了PPV类聚合物的主要合成方法,并对此类材料进行了分子结构设计,同时简要地介绍了相关器件的性能.     

Charge transfer in metallopolymer structure based on Cu(II) complexes

The process of ac electric conductivity in thin films of the poly[Cu(mSalpn-1,3)] complex compound has been studied for the first time. The experimental frequency dependence of the ac conductivity agrees with the model based on the hopping mechanism of charge transfer. The effect of temperature has been studied and the activation energies for charge carriers involved in the conductivity are determined. The role of the metal center (divalent copper) and the influence the electron structure of a ligand environment on the charge exchange in the metallopolymer structure are discussed.     

水包油(O/W)型乳液静电纺丝

将不同质量的聚氧乙烯(PEO)加入到由乳液聚合而得到的均匀的聚甲基丙烯酸甲酯(PMMA)/水乳液中,制备了稳定、质量分数分别为10%、15%、20%的PEO/乳液,并将其作为纺丝液进行静电纺丝。通过纳米粒径分析仪、粘度计、溶液电导率测试仪分析了纺丝液的性质;应用电子显微镜(SEM)分析了纺丝液浓度、纺丝电压、丝液流速对纤维形貌的影响。结果表明,采用乳液静电纺丝法可以制备具有芯-鞘结构的纳米颗粒及纳米纤维。     

Highly conductive, transparent flexible films based on open rings of multi-walled carbon nanotubes

Open rings of multi-walled carbon nanotubes were stacked to form porous networks on a poly(ethylene terephthalate) substrate to form a flexible conducting film (MWCNT-PET) with good electrical conductivity and transparency by a combination of ultrasonic atomization and spin-coating technique. To enhance the electric flexibility, we spin-coated a cast film of poly(vinyl alcohol) onto the MWCNT-PET substrate, which then underwent a thermo-compression process. Field-emission scanning electron microscopy of the cross-sectional morphology illustrates that the film has a robust network with a thickness of ~ 175 nm, and it remarkably exhibits a sheet resistance of approximately 370 Ω/sq with ~ 77% transmittance at 550 nm even after 500 bending cycles. This electrical conductivity is much superior to that of other MWCNT-based transparent flexible films.     

A Water-Soluble Polyaniline Complex for Ink-Jet Printing of Optoelectronic Devices

The influence of the ratio of components in polyaniline (PANI) complexes with poly(sulfonic acid) on the viscosity of their aqueous solutions and electric conductivity of layers formed thereof. The optical properties and morphology of PANI complex layers formed by ink-jet printing have been studied. The optimum ratio of components to be used in anodic buffer layers for organic solar cells is determined.     

Synthesis, characterization and electrical properties of carbon coated LiCoPO4 nanoparticles

Lithium cobalt phosphate (LiCoPO4) nanoparticles were synthesized using modified polyol process. Shape and size of LiCoPO4 nanoparticles were controlled by using poly (vinylpyrrolidone) (PVP) stabilizer. Coating of carbon over the LiCoPO4 nanoparticles was done using the resin coating process to enhance its conductivity. XRD and FTIR results respectively confirm the crystalline phase and structure of pure and carbon coated LiCoPO4 nanoparticles. SEM-EDX results confirm size and shape and also the presence of carbon over LiCoPO4 nanoparticles. Electrical conductivity of pure and carbon coated LiCoPO4 nanoparticles were evaluated by analyzing the measured impedance data using the win fit software. More than three orders of conductivity enhancement was observed in carbon coated LiCoPO4 nanoparticles when compared to pure ones. Further, transport properties like temperature dependence conductivity, AC conductivity, dielectric constant and electric modulus studies were made to find out the bulk and relaxation properties of LiCoPO4 nanoparticles.     

聚邻乙氧基苯胺(POEA)的研究进展

为了提高聚苯胺(PANI)的溶解性和导电性,近年来聚邻乙氧基苯胺(POEA)的合成受到越来越多的关注。POEA可由电化学方法或化学氧化法合成。本文综述了POEA的合成技术,材料表征技术、导电机理和POEA材料在导电导磁薄膜、防腐材料等领域的应用研究进展。     

Nonlinear response and two stable electroconducting states in transparent plasticized PVC films

The electric conductivity of transparent plasticized poly(vinyl chloride) (PVC) films with thicknesses about 30–50 μm has been studied in electric fields with strengths significantly below the breakdown level. It is established that the PVC films exhibit spontaneous reversible transitions between two stable states—with high and relatively low conductivities, in which the bulk resistivity amounts to ∼10³ and 10⁶ Ω m, respectively. Relaxation current-voltage characteristics have been measured in a continuous regime, which allowed the Debye relaxation processes to be taken into consideration and effects related to the nonlinearity and transitions between indicated states to be separated. A regime with deterministic switching between the two conducting states has been observed. A simple qualitative model that describes the anomalous character of conductivity in polymer films is proposed.     

Continuous low-voltage dc electroporation on a microfluidic chip with polyelectrolytic salt bridges

A microfluidic electroporator operating under a continuous low dc voltage (7 to approximately 15 V) is reported. The proposed electroporation microchip exploits the ionic conductivity of polyelectrolytic gel electrodes to precisely control the electric field that is applied to cells without bubble generation in the microchannel. In this study, pDADMAC (poly diallyldimethylammonium chloride) was used to efficiently apply the electric potential difference to the cells in the microchannels. Impedance analysis showed that the pDADMAC plugs could work as ionic conductors with a conductivity of approximately 16 S m(-1). In accordance with the calculation using CFD-ACE, an input voltage of only 10 V could generate an electric field of 0.9 kV cm(-1) across the microchannel; this meets the requirements for electropermeation. The electropermeation of K562 human chronic leukemia cells was observed in the microchip from 7 V, and the efficiency increased up to 60% upon the application of an input voltage of 15 V with a viability of 80%. An amount of 10(5) cells could be transfected every minute under a constant potential difference. The transfection and expression of DNA plasmids were also successfully demonstrated in the suspension cell line.     

Charge transport and luminescent properties of PMMA-dehydrate nanotubed titanic acid nanocomposites

In this paper, we doped p-type conductivity dehydrated nanotubed titanic acid (DNTA) into insulator polymer poly(methyl methacrylate) (PMMA). The electric properties of this nanocomposite were investigated. The photoluminescence efficiency of fluorescent dye 4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) in PMMA matrix was enhanced by doping with DNTA. Moreover, screen effect by DNTA with high permittivity caused the emission from DCJTB to be blue-shifted.