Adhesion Improvement of Zirconium Coating on Polyurethane Modified by Plasmas

In order to improve the adhesion of the middle frequency magnetic sputtered zirconium coating on a polyurethane film,an anode layer source was used to pretreat the polyurethane film with nitrogen and oxygen ions.SEMs and AFM roughness profiles of treated samples and the contrast groups were obtained.Besides,XPS survey spectrums and high resolution spectrums were also investigated.The adhesion test revealed that ion bombardment could improve the adhesion to the polyurethane coating substrate.A better etching result of oxygen ions versus nitrogen predicts a higher bonding strength of zirconium coating on polyurethane and,indeed,the highest bonding strengths are for oxygen ion bombardment upto 13.3 MPa.As demonstrated in X-ray photoelectron spectroscopy,the oxygen ion also helps to introduce more active groups,and,therefore,it achieves a high value of adhesion strength.

Research progress and application prospect of functional adhesive materials in the field of oil and gas drilling and production

By summarizing the composition,classification,and performance characterization of functional adhesive materials,the adhesion mechanisms of functional adhesive materials,such as adsorption/surface reaction,diffusion,mechanical interlocking,and electrostatic adsorption,are expounded.The research status of these materials in oil and gas drilling and production engineering field such as lost circulation prevention/control,wellbore stabilization,hydraulic fracturing,and profile control and water plugging,and their application challenges and prospects in oil and gas drilling and production are introduced comprehensively.According to the applications of functional adhesive materials in the field of oil and gas drilling and production at this stage,the key research directions of functional adhesive materials in the area of oil and gas drilling and production are proposed:(1)blending and modifying thermoplastic resins or designing curable thermoplastic resins to improve the bonding performance and pressure bearing capacity of adhesive lost circulation materials;(2)introducing low-cost adhesive groups and positive charge structures into polymers to reduce the cost of wellbore strengthening agents and improve their adhesion performance on the wellbore;(3)introducing thermally reversible covalent bond into thermosetting resin to prevent backflow of proppant and improve the compressive strength of adhesive proppant;(4)introducing thermally reversible covalent bonds into thermoplastic polymers to improve the temperature resistance,salt-resistance and water shutoff performance of adhesive water shutoff agents.

Effect of Yiqitongyanghuatan Recipe on Experimental Atherosclerosis in Rabbits

In order to investigate the roles of Yiqitongyanghuatan (YQTYHT) recipe in reducing the levels of serum cholesterol and plasma lipid peroxidation(LPO), platelet aggregation function (PAgF) and platelet adhesion function (PAdF), the area of atherosclerotic plague coverage in aorta and the thickness of plague, 32 male Japanese white rabbits were divided into 4 groups. The results showed that the YQTYHT recipe could significantly lower the levels of serum cholesterol and tryglyceride, plasma LPO, and PAgF and PadF. The area of atherosclerotic plague coverage in aorta and the thickness of plague in the YQTYHT fed rabbits were decreased as compared with that in the high cholesterol fed rabbits. The above roles might contribute to the main mechanism of YQTYHT against atherosclerosis.

粘附功方程的调和函数形式

粘附功是描述界面上不同分子间相互作用的重要参量。本文给出了以调和函数的形式构成粘附功方程的具体表达式,探讨了方程中因子的变化特性,结合印版界面,应用方程对一些研究成果进行了验证。结果表明,以这种形式构成方程得出的结论比较符合印版界面的实际情况。最后,本文应用方程参量解释了印版界面上分子相互作用的状态。