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。     

Novel Organic‐Dehydration Membranes Prepared from Zirconium Metal‐Organic Frameworks

Membranes with outstanding performance that are applicable in harsh environments are needed to broaden the current range of organic dehydration applications using pervaporation. Here, well‐intergrown UiO‐66 metal‐organic framework membranes fabricated on prestructured yttria‐stabilized zirconia hollow fibers are reported via controlled solvothermal synthesis. On the basis of the adsorption–diffusion mechanism, the membranes provide a very high flux of up to ca. 6.0 kg m^?2 h^?1 and excellent separation factor (>45 000) for separating water from i ‐butanol (next‐generation biofuel), furfural (promising biochemical), and tetrahydrofuran (typical organic). This performance, in terms of separation factor, is one to two orders of magnitude higher than that of commercially available polymeric and silica membranes with equivalent flux. It is comparable to the performance of commercial zeolite NaA membranes. Additionally, the membrane remains robust during a pervaporation stability test (≈300 h), including exposure to harsh environments (e.g., boiling benzene, boiling water, and sulfuric acid) where some commercial membranes (e.g., zeolite NaA membranes) cannot survive.     

增强增韧尼龙66工程塑料流变行为的研究

对以合金化技术改性所得增强增韧尼龙６６进行流变行为研究的结果表明，填充玻纤，可使其增强，但使流动性能下降：共混接枝聚丙烯，可使其增韧，并改善加工流动性，填充超细滑石粉，除有一定增强作用外，也使加工流动性，制品表面光滑程度和尺寸稳定性得到改善。填充共混的协同作用使改性尼龙６６有较好的综合性能。     

灭菌处理对纳米羟基磷灰石增强聚酰胺66 复合材料性能的影响

不同灭菌方法都有可能对骨修复生物材料的物理和化学性能产生影响。骨修复生物材料的力学性能决定了整形外科手术的短期或中长期结果。文中采用IR,XRD和常规力学性能测试等方法研究了蒸汽灭菌和γ射线辐照灭菌对纳米羟基磷灰石增强聚酰胺66(n-HA/PA66)骨修复复合材料的物理化学性能的影响。XRD和IR分析结果表明,两种灭菌方法都不会改变n-HA/PA66骨修复材料中两相的功能团结构和晶体结构。蒸汽灭菌过程会降低材料的拉伸强度,杨氏模量,压缩强度和弯曲强度;而γ射线辐照灭菌处理对材料的力学强度有一定增强作用。     

高温热氧老化对尼龙66结晶与蠕变性能的影响

通过熔融挤出制备添加热稳定剂的稳定化尼龙66和未添加热稳定剂的尼龙66。采用差示扫描量热分析、X射线衍射、蠕变试验和显微拉曼等方法研究了高温(180℃)热氧老化不同时间后尼龙66的结晶性能、蠕变性能及外观形貌等,同时探讨了热稳定剂对其影响。结果表明,随着热氧老化时间的延长,尼龙66的熔融峰和结晶峰均向低温偏移,结晶度,α晶型的(100)晶面与(010)/(110)晶面的衍射峰强度之比与尼龙66的蠕变应变均呈下降趋势,稳定剂的存在减缓了上述现象,抑制了尼龙66的降解,提高了尼龙66在高温环境下的使用寿命。     

纳米羟基磷灰石/聚酰胺66复合材料在模拟体液(SBF)中的表面生物活性研究

通过纳米羟基磷灰石／聚酰胺66(n—HA／PA66)复合材料体外模拟体液(SBF)浸泡实验，以聚酰胺66(PA66)为对照，用IR、XRD、SEM和ICP等手段对材料的表面组成和形貌变化进行了分析，比较了PA66和n-HA／PA66复合材料的表面生物活性。结果表明，n-HA／PA66复合材料在SBF中其表面形成的HA沉积物为部分碳酸基团取代的磷灰石，而PA66在浸泡过程中Ca、P不在聚合物表面沉积；n-HA／PA66复合材料具有良好的生物活性，作为骨组织修复或替代材料具有较高的研究和应用价值。     

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。     

国内外聚酰胺现状与展望

回顾了聚酰胺（PA）的发展历程,阐述了PA生产技术的最新进展,分析了PA市场情况。预计2010年世界聚酰胺的生产能力和需求量将分别达到4．6Mt和5．3Mt。。提出了产业发展建议,认为今后PA工程塑料的发展必须高起点、大规模,提高产品质量、增强抗风险能力,并加快PA改性技术研究。     

高聚物PA66压力诱导流动成型研究

采用一种新的压力诱导流动成型工艺,将传统熔融加工成型的块状塑料PA66在一定的温度下,压力诱导后像“熔体”一样流动成型。研究了压力诱导成型过程中的温度、压力以及保压时间对PA66力学性能和结构的影响,并对其成型后的结构进行了研究和表征。结果表明,这种压力诱导流动成型方法,形成了特殊的微观片状结构,大大提高了其力学性能,是简单而行之有效的加工方法。     

Genome-Wide Identification of TaSAUR Gene Family Members in Hexaploid Wheat and Functional Characterization of TaSAUR66-5B in Improving Nitrogen Use Efficiency

Excessive input of nitrogen fertilizer not only causes a great waste of resources but brings about a series of ecological and environmental problems. Although Small Auxin Up-regulated RNAs (SAURs) participate in diverse biological processes, the function of SAURs in the nitrogen starvation response has not been well-studied. Here, we identified 308 TaSAURs in wheat and divided them into 10 subfamilies. The promoter regions of most TaSAURs contain hormone responsive elements, and their expression levels change under the treatment of different hormones, such as IAA, MeJA, and ABA. Interestingly, overexpression of one of the TaSAUR family members, a nitrogen starvation responsive gene, TaSAUR66-5B, can promote the growth of Arabidopsis and wheat roots. In addition, overexpression of TaSAUR66-5B in Arabidopsis up-regulates the expression levels of auxin biosynthesis related genes, suggesting that overexpression TaSAUR66-5B may promote root growth by increasing the biosynthesis of auxin. Furthermore, overexpression of TaSAUR66-5B in wheat can increase the biomass and grain yields of transgenic plants, as well as the nitrogen concentration and accumulation of both shoots and grains, especially under low nitrogen conditions. This study provides important genomic information of the TaSAUR gene family and lays a foundation for elucidating the functions of TaSAURs in improving nitrogen utilization efficiency in wheat.