万兆以太网物理层编码芯片设计

提出了一种并行处理的编解码方案。采用这种方案．设计了万兆以太网10GBASE-R标准的物理编码子层发送端芯片。芯片由64b／66b编码、扰码和变速箱3部分组成。考虑到测试问题,该芯片内置了伪随机码数据源。这种方案的优点是逻辑简单、速度快。芯片采用TSMC 0.18μmCMOS工艺,用全定制方式实现。芯片引脚分布时参照PLCC48规格。     

MAH-g-POE及玻璃纤维对尼龙66的改性研究

采用马来酸酐接枝乙烯-1-辛烯共聚物(MAH-g-POE)及玻璃纤维(GF)对尼龙(PA)66进行共混改性,对共混材料的力学性能和微观结构进行了分析表征。结果表明:POE-g-MAH可改善PA 66/POE、PA 66/GF的界面结合,增强体系的相容性,是PA 66/POE-g-MAH/GF复合材料一种有效的界面增容剂;当PA 66/POE-g-MAH/GF配比(质量份)为65/10/25时,该复合材料的缺口冲击强度为268 J/m,拉伸强度为130 MPa。     

Dispersion characterization in layered double hydroxide/Nylon 66 nanocomposites using FIB imaging

Layered double hydroxides (LDHs), a newly emerging 2D host material, consist of cationic brucite-like layers and exchangeable interlayer anions. In this work, the morphology and dispersion of LDH particles in LDH/Nylon 66 (salt) nanocomposites has been investigated using focused ion beam (FIB) techniques, transmission electron microscopy (TEM) and X-ray diffraction (XRD). The FIB images show that LDHs are present in the polymer phase dispersed to different degrees, with partial intercalation, exfoliation, and aggregation all being observed. The most even dispersion was achieved in nanocomposites with the lowest loading (0.5 wt % LDH). Residual tactoids and agglomerates were most common in the samples made with the highest concentration of LDHs studied here (5 wt %). The dispersion observed using FIB was consistent with TEM and XRD analysis, yet this technique had significant benefits in terms of time and simplicity over these “conventional” technologies. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

基于IRC和电热加速老化试验的XLPE电缆绝缘性能研究

为了研究66 kV XLPE电力电缆的绝缘性能,文中采用自主设计的加速老化试验平台,同时对三根样品电缆分别进行两个阶段的电老化、热老化以及电热联合老化.利用等温松弛电流法(IRC)分别对加速老化前后的样品电缆进行试验,分析老化因子的改变,研究电缆的绝缘性能变化.试验结果表明:经过两个阶段的加速老化试验,电老化样品老化因子分别增加3.70%和4.21%,而热老化样品老化因子分别增加4.82%和23.42%,说明电应力和热应力在影响绝缘老化性能中,热应力的“贡献”更大,且温度越高,热应力起到的作用越大;电热联合双应力作用下的样品老化因子分别增加13.04%和37.50%,电热联合作用下老化因子变化远大于单一应力作用的样品老化因子变化,说明电、热两种应力存在某种协同作用,联合作用会加快电缆绝缘劣化.     

Mechanical and dynamic mechanical properties of nylon 66/montmorillonite nanocomposites fabricated by melt compounding

Nylon 66 nanocomposites were prepared by melt compounding of nylon 66 with organically modified montmorillonite (MMT). The organic MMT was pre‐modified with about 14 wt% of ammonium surfactant, much lower than the 35–46 wt% in most commercial organic MMT powders. Transmission electron microscope observation indicated that the MMT layers were well exfoliated in nylon 66 matrix. Dynamic mechanical analysis confirmed the constraint effect of exfoliated MMT layers on nylon 66 chains, which benefited the increased storage modulus, increased glass transition temperature and reduced magnitude of alpha relaxation peak. The effects of organic MMT loading levels on reinforcement and fracture behaviour of the nanocomposites were evaluated using tensile and three‐point bending tests. The addition of the organic MMT clearly increased Young's modulus and tensile strength but decreased ductility and fracture toughness of nylon 66. Copyright © 2004 Society of Chemical Industry     

尼龙66管材生产工艺探讨

探讨口径１１０ｍ以上，壁厚１０ｎｍ以上的尼龙６６管材的生产工艺，提出了时现行工艺的改进意见。     

Synthesis and properties of nylon 6/66/510 used as hot melt adhesives for metal plate with low-surface-energy coating

In this work, nylon 6/66 and nylon 6/66/510 containing 5?～?20?mol % nylon-510 were synthesized to be used as hot melt adhesive for metal plate with low-surface-energy coating. The effects of mole fraction of nylon-510 (X_m) on the thermal and mechanical properties of nylon 6/66/510 were systematically studied. The results demonstrated that: (1) the melting point of the copolyamide decreases and the glass transition temperature decreases when the X_m value increases; (2) the tensile strength of nylon 6/66/510 remains almost unchanged and is almost equal to that of nylon 6/66; (3) the elongation at break of nylon 6/66/510 is significantly higher than that of nylon 6/66. The crystal structure of the copolyamide was also investigated by wide-angle X-ray diffraction (WAXD). The hot-melt adhesives (HMAs) were prepared from nylon 6/66/510, and the adhesive experiments of HMAs to aluminum sheet with low-surface-energy coating were carried out. The results showed that the peeling strength of HMAs based on nylon 6/66/510 reaches a maximum value when X_m = 15?mol %.     

改性蛭石粉体填充PA66微观结构及性能影响研究

对蛭石粉体填充PA66进行了试验研究,考察了经不同偶联剂表面处理的蛭石粉体及其不同填充用量对PA66性能的影响.结果表明,钛酸酯和硬脂酸混合处理的蛭石PA66复合材料的力学性能最佳,当加入26%混合处理的蛭石粉体时,复合材料的拉伸强度、弹性模量、弯曲模量分别提高9%、116%和55%.     

Fabrication of core–shell MIL-101(Cr)@UiO-66(Zr) nanocrystals for hydrogen storage

The fabrication of core–shell nanocrystals by incorporating microporous UiO-66 into mesoporous MIL-101 is reported. The growth of the core–shell MIL-101@UiO-66 nanocrystals was observed and supported by TEM and PXRD. The accessible pore volumes of the individual metal-organic framework (MOF) components and the core–shell hybrid crystals were also characterized. The hydrogen storage capacity exhibited by the resulting core–shell nanocrystals was 26% and 60% higher than those of pure phase MIL-101 and UiO-66, respectively. Finally, the fabricated core–shell MIL-101@UiO-66 structure exhibited a high degree of moisture tolerance.     

提高尼龙66细旦丝染色均匀性的工艺探讨

采用FDY一步法生产233 dtex／72f尼龙66细旦丝的工艺过程中,通过控制聚合物质量、纺丝温度、侧吹风风速、纺丝组件、上油率、热辊温度、张力等工艺,可明显提高尼龙66细旦丝的染色性能。