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《化工新型材料》2001,(4)
产品名称规格型号产地价格 (元 /吨 )氟塑料FPD -92 94杜邦面议氟塑料粒料FEP国产面议氟塑料粒料PVDF国产面议氟塑料粒料PFA国产面议氟添加剂MP -10 0 0进口面议氟添加剂MP -130 0进口面议聚四氟乙烯及产品F2 0 1,10 4日本 1180 0聚全氟乙丙烯FEP -10 0J杜邦面议聚全氟乙丙烯FEP -110J杜邦面议聚全氟乙丙烯FEP -14 0J杜邦面议聚全氟乙丙烯FEP -16 0J杜邦面议聚全氟乙丙烯FEP -5 10 0J杜邦面议聚全氟乙丙烯FEP -TE92 90杜邦面议聚全氟乙丙烯FED -92 94杜邦面议聚三氟氯乙烯树脂 2 0kg 国产 … 相似文献
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用玻璃纤维布增强、聚全氟乙丙烯改性聚四氟乙烯,制备了高性能聚四氟乙烯覆铜板.系统研究了玻璃纤维布及偶联剂的种类与含量、乳液比例等对覆铜板主要性能的影响.结果表明,聚四氟乙烯与聚全氟乙丙烯相容性能好,聚全氟乙丙烯最佳重量百分数为50%.选用Z6032硅烷偶联剂处理1080玻璃纤维布得到综合性能好的覆铜板.增强改性后,覆铜板剥离强度从1.8kN/m提高到2.26kN/m,抗弯强度从100MPa提高到134 MPa. 相似文献
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《化工新型材料》2000,(11)
产品名称规格型号产地价格 (元 /吨 )八氟环丁烷国产面议氟添加剂MP 10 0 0进口面议产品名称规格型号产地价格 (元 /吨 )氟添加剂MP 130 0进口面议间二三氟甲苯≥ 99%国产 80 0 0 0聚全氟乙丙烯FEP 10 0J杜邦面议聚全氟乙丙烯FEP 110J杜邦面议聚全氟乙丙烯FEP 14 0J杜邦面议聚全氟乙丙烯FEP 16 0J杜邦面议聚全氟乙丙烯FEP 5 10 0J杜邦面议聚全氟乙丙烯FEP TE92 90杜邦面议聚全氟乙丙烯FED 92 94杜邦面议聚四氟板国产 115 0 0 0聚四氟乙烯CD 0 76英国面议聚四氟乙烯 6CJ杜邦面议聚四氟乙烯 6 5N杜邦面… 相似文献
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美国NASA阿姆斯研究中心与爱达荷大学的研究人员共同开发了全氟三嗪弹性体。反应式1示出了全氟烷基醚二腈与氨反应生成聚(亚胺基脒)。反应式2示出了聚(亚胺基脒)与三氟醋酐反应生成环状三嗪。反应式3示出了氨与直链聚(全氟烷基醚三嗪) 相似文献
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研究了聚甲醛生产过程中的反应温度、引发剂三氟化硼用量、反应物配合比、反应物二氧五环添加方式及聚合方式等对聚甲醛不稳定末端基(HO)的影响,研究结果表明,在反应温度为89℃,引发剂用量为50×10~(-6),采用引发剂与二氧五环单体先期聚合条件下,不稳定末端基含量最低,为0.86%,此时聚甲醛的热稳定性最好,初始热分解温度为314℃,二氧五环的加入,能够有效地提高聚甲醛分子链的热稳定性,减少不稳定末端基,聚甲醛不稳定末端基对聚甲醛的热分解温度具有较大影响,随着不稳定末端基的升高,聚甲醛的热分解温度随之降低,热稳定性下降;经过对反应条件研究优化后,聚甲醛的热分解温度比原先提高了25℃。 相似文献
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综述了聚全氟乙丙烯制备技术中聚合介质改进、共聚反应控制方法研究、聚合物改性技术等方面的进展,并提出了值得关注的工程技术问题. 相似文献
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理想情况下,惯性稳定平台的质心会位于其旋转轴上,但是由于加工技术等条件的限制,惯性稳定平台的质心会偏离旋转轴,并且在基座角运动和摩擦等扰动作用下,惯性稳定平台会产生偏转角,偏转角的变化会引起水平和垂直方向上的不平衡力臂变化,形成不平衡扰动。为了分析不平衡扰动对平台性能的影响,在对惯性稳定平台的动力学模型进行简化的基础上,提出通过分析平台偏转角和不平衡力臂的变化规律建立不平衡扰动模型的思想方法,以所建模型为基础,对不平衡扰动的影响进行了定量分析。仿真结果表明,不平衡扰动会使平台的角度输出稳态值超过其稳定精度要求,严重影响惯性稳定平台的稳定性能。 相似文献
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H2C2O4稳定剂对SOl-Gel法制备LiNbO3薄膜的影响 总被引:1,自引:0,他引:1
研究了分别以H2C2O,HNO3,HCOOH和CH3COOH作稳定剂的LiNbO3薄膜先驱液的稳定性,发现H2C2O4作稳定剂的先驱液的稳定性最好,用sol-gel法在Si(110)基板上制备了以H2C2O4作稳定剂的LiNbO3薄膜,并对LiNbO3薄膜进行了IR,XRD和SEM表征,结果表明,生成的LiNbO3为多晶,与HNO3相比,以H2C2O4作稳定剂制备的LiNbO3薄膜形貌较差。 相似文献
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Simulation of low cycle fatigue stress‐strain response in 316LN stainless steel using non‐linear isotropic kinematic hardening model—A comparison of different approaches
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Ashraf Q. J. Prasad Reddy G. V. Sandhya R. Laha K. Harmain G. A. 《Fatigue & Fracture of Engineering Materials & Structures》2018,41(2):336-347
Cyclic stress‐strain response of 316LN stainless steel subjected to low cycle fatigue at strain amplitude of ±0.4% and at 873 K is simulated using finite element analysis with non‐linear isotropic‐kinematic hardening Chaboche model. Four different approaches have been used in simulating cyclic stress response and hysteresis loops: 3 based on Chaboche model‐parameters and the fourth on direct experimental data (stabilized loop and cyclic stress‐strain curve [CSSC]). Among them, simulations performed with direct experimental data have not yielded expected initial cyclic response. The source of data used for evaluation of kinematic‐hardening (KH) parameters determined the extent of closeness between experimental results and Chaboche‐model predictions. KH parameters determined from first‐cycle loop and modified‐CSSC predicted the overall stress‐strain response (from initial to stabilized condition) with reasonable fit, compared with other approaches. All 4 approaches though predicted stabilized response, simulations based on “KH‐parameters from stabilized‐cycle” accurately described stabilized response with coefficient of determination (r2) 0.995. 相似文献
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Easily oxidizable oxides, FeO, and MnO, are unstable in air but can be easily stabilized by small amounts of other oxides.
Further these two unstable oxides stabilize each other very well. Such stabilized FeO and MnO provide easy and reproducible
methods of preparing electronic ceramics that need such unstable valency states in them. Ferrous-zinc ferrite has been successfully
synthesized employing FeO stabilized with a small amount of Fe3O2.
NCL Communication No. 2751 相似文献
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Thormann A Teuscher N Pfannmöller M Rothe U Heilmann A 《Small (Weinheim an der Bergstrasse, Germany)》2007,3(6):1032-1040
Nanoporous aluminum oxide membranes with high open porosity are prepared by anodic oxidation. Conventional self-supporting as well as mechanically stabilized nanoporous membranes are produced from aluminum plates and microimprinted aluminum foils, respectively. The mechanically stabilized membranes are characterized by very thin membrane parts stabilized by surrounding thick bridges. The minimal thickness of these thin membranes with open pores on both sides is 1 microm, with a mean pore size of the parallel open pores of 185 nm. With these two kinds of membrane the flow rates for cross filtration can be tuned over a wide range. With the mechanically stabilized membranes, substantially higher flow rates are achieved and experiments that cannot be performed with thicker membranes become possible. The biofunctionalization of the pore walls with archaebacterial tetraether lipids is realized and proved using aminated semiconductor nanocrystals. The lipid layer deposited on the pore walls also changes the filtration properties. 相似文献
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利用光频梳对稳频激光波长进行测量是建立基于光频梳的波长基标准的必经程序。为了建立基于光频梳的波长标准,并为开展激光波长校准工作提供技术准备,利用自研光纤光频梳对乙炔稳频1542 nm激光波长进行了测量。利用光频梳产生参考激光与待测激光差拍,通过简单的代数关系获得了乙炔稳频激光的绝对频率和真空波长,并与相应的国际推荐值进行了对比。实测获得的乙炔稳频激光的真空波长值为1542.38 371 235 742 nm,在CIPM给定的不确定度范围内,秒稳定度为4.13 × 10-13。两台不同的光频梳对乙炔稳频激光波长的测量结果具有高度一致性,进一步证明了光频梳对激光波长的测量准确性。本研究对于顺应国际长度基标准发展趋势,加速光频梳在激光波长测量领域的应用进程具有重要意义。 相似文献