Fibrinogen Adsorption on Biomaterials as Characterized by Transmission FTIR Spectroscopy

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Structural Changes of Polyethylene Terephthalate Fibers Grafted by Acrylamide

A group of grafted PET fibers with different graft yield are formed by grafting acrylamide onto the PET main chains. The structure of grafted fibers are studied by scanning electronic microscope ( SEM ), infra-red spectrophotometer ( IR ), and differential scanning calorimetry(DSC). At the same time, the moisture regain, dyeability, strength, and elongation at break of the samples are measured and their relations with structural changes are discussed. Compared with ungrafted fiber, shape of the fiber cross-section, IR characteristic absorption peaks, and melting behavior of the grafted fibers have been changed, causing the fiber dyeability and moisture regain to be increased, and mechanical properties to be changed.     

Study on Surface Modification of Glass Bead by a Block Copolymer Coupling Agent

A tri-block copolymer coupling agent polystyreneblock-poly （n-butyl-acrylate）-block-poly （y-methacryloxypro pylt rimethoxysilane）（PS-b-PnBA-b-PMPS） was synthesized by atom transfer radical polymerization （ATRP）, and its molecular structure was characterized by fourier-transform infrared spectra, hydrogen nuclear magnetic resonance and gel permeation chromatography. The glass bead was treated with the block copolymer coupling agent, and then studied by transmission electron microscopy. The result showed that strong interaction was formed between the block copolymer coupling agent and the surface of glass bead, and then the block of poly（n-butylacrylate） formed a layer of film on the surface.     

Application of ANSYS 3D FEM in Studies of Surface Deformation Caused by Pipe Jacking

By using site observation data and establishing 3D model using ANSYS software,this paper has discussed the strain change of stratum stress during process of jacking-in and the im-pact of machine head on ground surface under different frontal resistances. Analysis of the two cases shows that soil pressure reaches its maximum point when the soil is right above machine head,and soil stress will gradually decline when machine head passes over it. It also shows that impact brought by pipe-jacking construction on stress change of the surrounding soil is limited. The thesis suggest that road surface should be consolidated and soil condition be improved before construction to prevent loss and disaster caused by road surface deformation,jacking force can be increased so that jacking efficiency can be enhanced when ground stratum is well filled with soil,but the frontal resistance facing machine head should be equal to surrounding soil pressure in order to avoid rise of ground surface.     

A Study on the Surface Structures of Viscose-based Activated Carbon Fiber by FT-IR Spectroscopy and XPS

Using viscose fiber (VF) as starting material and common steam as activating agent, formation of oxygen structures in activated carbon fiber is investigated. In the preparation of samples, VF was first heated at temperatures between 450℃ and 900℃ in N_2 artmosphere. Then, in a successive activation stage, the product carbonized at 600℃ was activated in steam at 450-900℃ for 30 min, and at 600℃ for 5-30 min. The other carbonization products were activated at 600 and 900℃ for 30 min respectively. The products activated at 900℃ were then activated at 450℃ for 30 min again. The starting materiah carbonized products and all activation products were examined by FT-IR spectroscopy and some products were examined by X-ray photoelectron spectroscope (XPS). And the yields of the carbonized and activated products were calculated. By analysing these spectra, the amount of oxygen-containing functional groups of the activated products attained under various activation time, various activation temperature and     

表面活性剂固-液界面吸附研究的某些新进展

本文综述了离子型表面活性剂以及阳离子与非离子型表面活性剂的混合体系在固—液界面吸附的情况．     

表面活性剂表(界)面吸附状态方程

评价了表面活性剂表(界)面吸附单分子层状态方程的热力学理论,分析了单分子层中表面活性剂基团之间的相互作用(亲水基之间的相互排斥,疏水基之间的相互吸引)和表(界)面下方基底液中无机盐的存在对单分子吸附层状态的影响,提出了一个新的关于表面活性剂表(界)面吸附单分子层的一般表面状态方程。结果与文献报道一致。