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一种氧化叔胺化合物在热敏材料体系中的作用
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作者 樊武琨 林璐 李仲晓 《信息记录材料》 2010年第6期8-11,共4页
利用双氧水将无色结晶紫分子中的叔胺基团氧化,得到含三个氧化叔胺基团的结晶紫氧化物(OLCV),并通过TGA和DSC测试其热稳定性。将OLCV作为助剂添加到一种基于酚醛树脂的热敏树脂体系中,发现其具有很强的阻溶性,并测定加入量对热敏树脂的... 利用双氧水将无色结晶紫分子中的叔胺基团氧化,得到含三个氧化叔胺基团的结晶紫氧化物(OLCV),并通过TGA和DSC测试其热稳定性。将OLCV作为助剂添加到一种基于酚醛树脂的热敏树脂体系中,发现其具有很强的阻溶性,并测定加入量对热敏树脂的碱溶性影响,研究了该种氧化叔胺化合物的在热敏体系中的可能应用。 展开更多
关键词 热敏 氧化叔胺 阻溶性
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Solid solution strengthening and damping capacity of Mg-Ga binary alloys 被引量:4
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作者 Wen-sen HUANG Ji-hua CHEN +4 位作者 Hong-ge YAN Qiang LI Wei-jun XIA Bin SU Wei-jun ZHU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第9期2852-2865,共14页
The mechanical behaviors and damping capacities of the binary Mg−Ga alloys with the Ga content ranging from 1 to 5 wt.%were investigated by means of optical microscope(OM),scanning electron microscope(SEM),X-ray diffr... The mechanical behaviors and damping capacities of the binary Mg−Ga alloys with the Ga content ranging from 1 to 5 wt.%were investigated by means of optical microscope(OM),scanning electron microscope(SEM),X-ray diffraction(XRD),hardness test,tensile test and dynamic mechanical analyzer(DMA).The hardness(HV_(0.5))increases with the increase of Ga content,which can be described as HV_(0.5)=41.61+10.35c,and the solid solution strengthening effect∆σ_(s)of the alloy has a linear relationship with c^(n),where c is the molar fraction of solute atoms and n=1/2 or 2/3.Ga exhibits a stronger solid solution strengthening effect than Al,Zn or Sn due to the large atomic radius difference and the modulus mismatch between Ga and Mg atoms.The addition of Ga makes the Mg−Ga alloys have better damping capacity,and this phenomenon can be explained by the Granato−Lücke dislocation model.The lattice distortion and the modulus mismatch generated because of the addition of Ga increase the resistance to motion of the dislocation in the process of swinging or moving,and thus the better damping capacity is acquired. 展开更多
关键词 Mg-Ga alloys solid solution strengthening damping capacity Granato-Lücke model
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Drag-reduction of a nonionic surfactant aqueous solution and its rheological characteristics 被引量:7
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作者 CAI ShuPeng SUZUKI Hiroshi KOMODA Yoshiyuki 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第3期772-778,共7页
In order to develop turbulent drag-reducing technology by using an environmentally friendly additive in a water-transporting system,the drag reducing characteristics in a non-ionic surfactant(Oleyldimethylamineoxide,O... In order to develop turbulent drag-reducing technology by using an environmentally friendly additive in a water-transporting system,the drag reducing characteristics in a non-ionic surfactant(Oleyldimethylamineoxide,ODMAO) dilute aqueous solution flowing in a circular pipe of 5 mm diameter have been experimentally investigated with an air-driven fluid resistance test device.The rheological characteristics of the solution have also been examined by a rheometer with a cone-plate flow cell.The results show that the ODMAO solutions are drag-reducing when concentration is 400 ppm or higher,that the critical Reynolds number corresponding to the maximum drag reduction rate increases with both concentration and temperature,and that the maximum drag reduction rate can reach up to 70% in the straight pipe.At low shear rates,the shear viscosity of ODMAO solutions with a relatively high drag-reduction behaves similarly to Newtonian fluids;at above a certain critical shear rate,it is firstly shear-thickening,then shear-thinning.Such shear-rate-dependent characteristics of the shear viscosity are attributed to the different transitions of micellar network structure induced by different shear rates.Relaxation of shear stress after removing an applied constant shear rate at which the solution is in the SIS(shear-induced structure) state is found to be well expressed by a 2-step Maxwell model with a tail relaxation time much shorter than that for a drag-reducing cationic surfactant,which indicates that for the ODMAO solution,a viscoelasticity as strong as a drag-reducing cationic surfactant is not needed to realize turbulent drag-reduction. 展开更多
关键词 nonionic surfactant drag-reduction shear viscosity shear stress relaxation
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