EPDM共混改性研究概况

介绍了三元乙丙橡胶在橡胶/橡胶共混、橡胶/树脂共混及热塑性弹性体等领域的研究情况     

A Novel Approach to Molecular Recognition Surface of Magnetic Nanoparticles Based on Host–Guest Effect

A novel route has been developed to prepared β-cyclodextrin (β-CD) functionalized magnetic nanoparticles (MNPs). The MNPs were first modified with monotosyl-poly(ethylene glycol) (PEG) silane and then tosyl units were displaced by amino-β-CD through the nucleophilic substitution reaction. The monotosyl-PEG silane was synthesized by modifying a PEG diol to form the corresponding monotosyl-PEG, followed by a reaction with 3-isocyanatopropyltriethoxysilane (IPTS). The success of the synthesis of the monotosyl-PEG silane was confirmed with ¹H NMR and Fourier transform infrared (FTIR) spectroscopy. The analysis of FTIR spectroscopy and X-ray photoelectron spectroscopy (XPS) confirmed the immobilization of β-CD onto MNPs. Transmission electron microscopy (TEM) indicated that the β-CD functionalized MNPs were mostly present as individual nonclustered units in water. The number of β-CD molecules immobilized on each MNP was about 240 according to the thermogravimetric analysis (TGA) results. The as-prepared β-CD functionalized MNPs were used to detect dopamine with the assistance of a magnet.     

Discovery of a Potent,CNS‐Penetrant Orexin Receptor Antagonist Based on an N,N‐Disubstituted‐1,4‐diazepane Scaffold that Promotes Sleep in Rats

Silent Night : Antagonism of the orexin (or hypocretin) system has recently been identified as a novel mechanism for the treatment of insomnia. Herein, we describe discovery of a dual (OX₁R/OX₂R) orexin receptor antagonist featuring a 1,4‐diazepane central constraint that blocks orexin signaling in vivo. In telemetry‐implanted rats, oral administration of this antagonist produced a decrease in wakefulness, while increasing REM and non‐REM sleep.

     

SiC对Ni-W合金耐蚀耐磨性能的强化作用

为提高严苛海洋环境下金属机件的服役性能,本文通过电沉积方法制备了Ni-W和Ni-W/SiC复合镀层。利用扫描电子显微镜（SEM）、能谱分析（EDS）和X射线衍射（XRD）等技术研究了SiC对Ni-W合金微观结构和性能的影响,采用电化学方法研究了复合镀层在3.5% NaCl溶液中的耐蚀性能,以探讨其海水综合防护性能。研究表明,经表面处理的SiC可诱导形核促进晶体生长,使Ni-W合金晶粒变细,镀层完整致密。SiC纳米颗粒均匀分布在Ni-W/SiC中,可有效提高镀层硬度及耐磨性,同时Ni-W/SiC也具有比Ni-W合金更好的耐蚀性能,在多因素交互作用的海洋环境中将具有更长的防护寿命,具有良好的应用前景     

采用溶胶-凝胶法在多孔氧化铝模板上制备立方相WO3纳米线

采用溶胶-凝胶法在纳米孔氧化铝模板上成功制备形貌各异的WO3纳米线.X射线衍射分析表明所制备的WO3纳米线为立方相结构.经扫描电子显微镜观察发现产物多数为菊花状WO3纳米线,其直径约10～80 nm,长约几微米.与空气气氛相比,氩气气氛更有助于WCl6三嵌段共聚物溶胶在多孔氧化铝模板上形成形貌各异的WO3纳米线.     

交联聚烯烃热塑性弹性体的性能研究 I.Engage 8180的结构性能

研究了聚烯烃热塑性弹性体的静态力学性能和动态力学性能,探讨了炭黑用量和炭黑表面预处理对ＰＯＥ性能的影响。结果表明：交联３和填充都将使ＰＯＥ结果的度减小;硅烷偶联剂ＶＴＰＳ和Ａ１５１能够有效增强炭黑与ＰＯＥ间的界面作用,从而使胶料各项物理性能得到改善,特别是内部动态温升大幅度下降,接近ＳＢＲ的水平。     

交联聚烯烃热塑性弹性体的性能研究 Ⅱ.应力-应变特性和高温性能

研究了硅烷偶联剂改性炭黑补强的交联ＰＯＥ（包括Ｅｎｇａｇｅ８００３,８１５０,８１８０ 和８２００）的动态和静态力学性能,重点考察了其应力应变特性和在高温（１００ ℃） 下的物理性能,探讨了ＰＯＥ分子结构与性能之间的关系,还进行了高温下（１２０ ℃）不同启模方式的恒应变静压缩实验。结果表明：门尼粘度较高的ＰＯＥ（８００３,８１５０ 和８１８０）具有较好的动态抗压缩疲劳性能,而且其综合性能较佳,特别是８００３ 胶料在常温下具有较高的抗撕裂能力;但是在高温下ＰＯＥ的拉伸性能下降较大,其撕裂性能略低于ＥＰＤＭ 和ＳＢＲ 胶料;高温（１２０ ℃）下ＰＯＥ的静压缩实验结果对夹具开启的方式有很大的依赖性,ＰＯＥ的以上这些特性均与交联ＰＯＥ胶料中存在结晶微区结构和此结构含量有关。     

具有多层结构的可拉伸可折叠自修复有机硅导电弹性体∗

自修复导电弹性体在可穿戴设备领域有着巨大的应用潜力,但其导电性能和稳定性难以兼顾。 在自修复弹性体基材表面依次构建粗糙微米结构和金属导电层,构建形成新型导电弹性体(Ag / SiO₂ / B-BZn-PDMS)。 制备获得基于硼酸酯/ 配位双交联的新型自修复有机硅弹性体(B-BZn-PDMS),其抗拉强度为 0. 52±0. 05 MPa,断裂伸长率 98±5%,6 h 室温修复率可达 98. 1%。 研究结果表明:双层导电层具有良好的导电性能(电阻 4 Ω),经过 11 次拉伸循环,导电性能仍然保持。 此外,Ag / SiO₂ / B-BZn-PDMS 导电性能可在室温 20 min 自修复,电阻修复率可达 93%以上。 提出利用自修复弹性体以及粗糙结构构建柔性耐用导电弹性体的思路,为低成本高性能导电涂层开发提供了新的途径。     

Preparation and electrochemical characterization of Ti-based amorphous metallic glass with high strength

Ti-based amorphous metallic glasses have excellent mechanical, physical, and chemical properties, which is an important development direction and research hotspot of metal composite reinforcement. As a stable, simple, efficient, and large-scale preparation technology of metallic powders, the gas atomization process provides an effective way of preparing amorphous metallic glasses. In this study, the controllable fabrication of a Ti-based amorphous powder, with high efficiency, has been realized by using gas atomization. The scanning electron microscope, energy-dispersive spectrometer, and X-ray diffraction are used to analyze surface morphology, element distribution, and phase structure, respectively. A microhardness tester is used to measure the mechanical property. An electrochemical workstation is used to characterize corrosion behavior. The results show that as-prepared microparticles are more uniform and exhibit good amorphous characteristics. The mechanical test shows that the hardness of amorphous powder is significantly increased as compared with that before preparation, which has the prospect of being an important part of engineering reinforced materials. Further electrochemical measurement shows that the corrosion resistance of the as-prepared sample is also significantly improved. This study has laid a solid foundation for expanding applications of Ti-based metallic glasses, especially in heavy-duty and corrosive domains.     

汽车用铝合金5182-O态的工艺研究

通过试验研究出铝合金5182-O态生产工艺为:均匀化退火温度470℃,再结晶终了温度280℃.在试验条件下,产品力学性能和成形性能达到国标要求.