影响玉米淀粉粘合剂质量因素的研究

本文论述了影响玉米淀粉粘合剂粘结力、稳定性和纸箱干燥速度的因素，其中重点分析了玉米淀粉中蛋白含量的高低与粘合剂稳定性的关系，介绍了用膨润土作快干刑的原理及使用方法。     

Prevention of Hydrosilation Cure Inhibition in a Polysiloxane Adhesive by Surface Oxidation

For a variety of reasons epichlorohydrin-ethylene oxide (ECO)-based compounds, in the form of rain erosion boots or sleeves, are bonded to aircraft radomes using a hydrosilation-cured RTV polysiloxane adhesive. Unfortunately, cure of the adhesive can be completely inhibited by unreacted vulcanizing agent and/or ECO cure by-products. We have earlier shown that this inhibition can be prevented by treating the ECO surface with hydrogen peroxide to oxidize the hydrosilation catalyst poisons to a harmless state. In this study we have used spectroscopic techniques to monitor the hydrosilation reaction kinetics and in turn to identify the poison, define the poisoning level and monitor the poison removal by hydrogen peroxide treatment. The degree of poison removal is also correlated with adhesive bond strength using a 180°; peel test. The critical poison in the system was excess ECO vulcanizing agent which can be completely removed from the surface using a 30 vol. % H₂O₂ treatment for 30 minutes as long as the initial vulcanizing agent concentration is 1 p.p.h. or less.     

Adhesive Contact of a Membrane with a Hemispherical Indenter: Theoretical Analysis and Model Liquid System

The axisymmetric Laplace equation is solved numerically to extract contact-angle data for a flat liquid/vapor interface contacting a submerged hemispherical solid. The liquid/vapor interface is treated as a membrane, with a membrane tension equal to the surface energy of the liquid. By measuring the vertical displacement of the membrane and the projected contact area the membrane makes with the hemisphere, the contact angle and correspondingly the driving force for motion of the contact line can be measured. We show that characteristic receding and advancing contact angles can be obtained by measuring the contact radii formed upon initial contact between the interface and hemisphere and final contact just prior to detachment of the interface, respectively. Use of the technique is illustrated with a model experiment involving the contact of an air/water interface with a poly(methyl methacrylate) surface.     

Adhesive Contact of a Membrane with a Hemispherical Indenter: Theoretical Analysis and Model Liquid System

The axisymmetric Laplace equation is solved numerically to extract contact-angle data for a flat liquid/vapor interface contacting a submerged hemispherical solid. The liquid/vapor interface is treated as a membrane, with a membrane tension equal to the surface energy of the liquid. By measuring the vertical displacement of the membrane and the projected contact area the membrane makes with the hemisphere, the contact angle and correspondingly the driving force for motion of the contact line can be measured. We show that characteristic receding and advancing contact angles can be obtained by measuring the contact radii formed upon initial contact between the interface and hemisphere and final contact just prior to detachment of the interface, respectively. Use of the technique is illustrated with a model experiment involving the contact of an air/water interface with a poly(methyl methacrylate) surface.     

Adhesive Contact of a Compliant Sphere to an Elastic Coated Substrate: The Thin Film Limit

Experimental results for adhesive contacts on substrates coated with elastomeric thin films have recently been obtained by Tardivat and Léger [1 Tardivat , C. and Léger L. , J. Adhesion Sci. Technol. 15 , 1055 – 1078 ( 2001 ).[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]] by the so-called Johnson-Kendall-Roberts (JKR) test, which provides both adhesion energy and elastic modulus. These data show that on substrates coated with thin films the adhesion and effective elastic modulus of the sphere depend upon the film thickness. In keeping with the experimental conditions, we try to interpret these data using a simple model [4 Barthel , E. and Perriot , A. , J. Phys. D: Appl. Phys. 40, 1059–1067 (2007).[Crossref] , [Google Scholar]] in the thin film limit, i.e., when the film thickness is small compared with the contact radius. Although the film does impact the local crack tip stress field, we show that no effect on the macroscopic contact variables is expected for the adhesion to coated substrates in such confined geometries. The deviations from the experimental results are ascribed to the idealized contact boundary conditions assumed in the model.     

脱酸型有机硅密封胶浸水粘接性的研究

以α,ω-二羟基聚二甲基硅氧烷为基础聚合物、气相白炭黑为补强填料、配合醋酸型交联剂、催化剂制备出单组分脱酸型有机硅密封胶。重点考察了基础聚合物的挥发份、增塑剂用量及添加工艺、氯离子浓度对密封胶性能的影响,尤其是对密封胶与基材浸水粘接性的影响。结果表明,随聚合物中的挥发份和增塑剂比例的增加,密封胶与基材的浸水粘接性变差;当体系中的氯离子浓度超过100 ppm(1×10-4)时,密封胶与基材浸水后完全脱粘。     

A novel strategy for cartilage tissue engineering: Collagenase-loaded cryogel scaffolds in a sheep model

In this study, we developed a novel strategy, through which cartilage tissue pieces were placed in a sheep cartilage defect model and covered with a collagenase incorporated cryogel scaffold (in vivo cartilage tissue engineering, IVCTE group). While applying this strategy, the chondrocytes could be isolated inside the body and the treatment could be accomplished in one session. To compare our strategy, to another group, in which we used cultured cells and Chondro-gide, standard matrix-induced autologous chondrocyte implantation (MACI) was applied. Although the MACI applied group demonstrated better healing than IVCTE, the type II collagen synthesis was better in the IVCTE group compared to MACI applied group. Collagenase did not have detrimental effect on surrounding cartilage in IVCTE group. The preliminary results of the novel strategy applied group (IVCTE) were promising.     

玉米醇溶蛋白体内外降解行为的研究

目的：考查玉米醇溶蛋白体内外降解的情况。方法：用95％的乙醇溶液配制65％（g／mL）醇溶蛋白胶体溶液,用压模成型方法制备玉米醇溶蛋白棒,通过特性粘度、质量变化、扫描电镜观察等研究醇溶蛋白体内外降解过程。结果：醇溶蛋白体内外均能降解,在体内外降解的玉米醇溶蛋白棒只是表面变粗糙,但总体形态没有变化,且体内降解率大于体外降解率。随着降解的进行,棒表面逐渐粗糙,在体内还出现了凹状吸收。     

Bioluminescence Production by Turnip Yellows Virus Infectious Clones: A New Way to Monitor Plant Virus Infection

We used the NanoLuc luciferase bioluminescent reporter system to detect turnip yellows virus (TuYV) in infected plants. For this, TuYV was genetically tagged by replacing the C-terminal part of the RT protein with full-length NanoLuc (TuYV-NL) or with the N-terminal domain of split NanoLuc (TuYV-N65-NL). Wild-type and recombinant viruses were agro-infiltrated in Nicotiana benthamiana, Montia perfoliata, and Arabidopsis thaliana. ELISA confirmed systemic infection and similar accumulation of the recombinant viruses in N. benthamiana and M. perfoliata but reduced systemic infection and lower accumulation in A. thaliana. RT-PCR analysis indicated that the recombinant sequences were stable in N. benthamiana and M. perfoliata but not in A. thaliana. Bioluminescence imaging detected TuYV-NL in inoculated and systemically infected leaves. For the detection of split NanoLuc, we constructed transgenic N. benthamiana plants expressing the C-terminal domain of split NanoLuc. Bioluminescence imaging of these plants after agro-infiltration with TuYV-N65-NL allowed the detection of the virus in systemically infected leaves. Taken together, our results show that NanoLuc luciferase can be used to monitor infection with TuYV.     

Adhesion Promotion by Silanes: A Study of their Interfacial Chemistry in a Model Polystyrene Coating by XPS and SIMS

Adhesion of a polystyrene coating to solvent cleaned steel is increased two-fold by addition of 0.5% wt/wt of aminosilane (A1120). A study has been carried out on the coating-substrate interfacial chemistry to gain an understanding of the mechanism of adhesion promotion. It is shown that in peel experiments the coating fails adhesively between the polystyrene and an adsorbed layer of aminosilane on the steel surface. The improvement in adhesion results from displacement by the silane of the 1.4 nm thick layer of residual carbonaceous contamination on the steel surface. It is proposed that this leads to a stronger substrate-coating interaction either through improved intermolecular contact between the segregated silane and the polymer or through secondary bonding between the amine groups of the silane and the polarisable aromatic rings of the polystyrene.     

Adhesion Promotion by Silanes: A Study of their Interfacial Chemistry in a Model Polystyrene Coating by XPS and SIMS

Adhesion of a polystyrene coating to solvent cleaned steel is increased two-fold by addition of 0.5% wt/wt of aminosilane (A1120). A study has been carried out on the coating-substrate interfacial chemistry to gain an understanding of the mechanism of adhesion promotion. It is shown that in peel experiments the coating fails adhesively between the polystyrene and an adsorbed layer of aminosilane on the steel surface. The improvement in adhesion results from displacement by the silane of the 1.4 nm thick layer of residual carbonaceous contamination on the steel surface. It is proposed that this leads to a stronger substrate-coating interaction either through improved intermolecular contact between the segregated silane and the polymer or through secondary bonding between the amine groups of the silane and the polarisable aromatic rings of the polystyrene.     

甲基丙烯酸甲酯接枝废旧聚苯乙烯泡沫塑料制胶粘剂

以废旧聚苯乙烯(PS)泡沫塑料为主要原料,通过甲基丙烯酸甲酯接枝改性,制得一种新型废旧聚苯乙烯改性胶粘剂。研究了甲基丙烯酸甲酯用量、反应温度、反应时间、填料用量等因素对胶粘剂性能的影响。结果表明:甲基丙烯酸甲酯用量为废旧聚苯乙烯23%、反应温度为80℃、反应时间为1小时、填料用量为1.5g制得的胶粘剂性能较好。     

压敏胶粘剂的贮存寿命试验研究

采用不同温度、湿度的湿热加速老化试验方法，以剥离强度为指标，评估压敏胶粘剂的粘接贮存寿命。     

A Reliable Method to Measure the Adhesive Force with a Tiny Amount of Adhesive Material

A new method is proposed and developed to measure adhesive forces by use of the force-distance curve of a micro cantilever with an extremely small amount of testing material such as adhesive proteins. The contact area should be well-controlled at a reasonable value. Even though the area is desired to be as small as possible, a contact region of several micrometers by several micrometers is adopted in order to avoid obtaining meaningless measured values and uncertainty in the contact areas. An AFM cantilever is used after having been modified with a micro glass bead to enlarge the contact area for adhesion. A glass plate with micro-scale circular patterns is fabricated from a glass wafer by micro-machining processes in order to control precisely the contact area in adhesion tests. In the proposed method the adhesive materials are directly applied to the bead attached at the AFM cantilever before it is applied on the top area of the truncated cone on the fabricated glass plate. The developed method is applied to measure the adhesive forces of Cell-Tak® (which is a commercial extracted mussel adhesive) and recombinant Mgfp-5 (which is a recombinant mussel adhesive protein) and the statistical credibility of the measured adhesive force data is enormously improved as a result.     

A Reliable Method to Measure the Adhesive Force with a Tiny Amount of Adhesive Material

A new method is proposed and developed to measure adhesive forces by use of the force-distance curve of a micro cantilever with an extremely small amount of testing material such as adhesive proteins. The contact area should be well-controlled at a reasonable value. Even though the area is desired to be as small as possible, a contact region of several micrometers by several micrometers is adopted in order to avoid obtaining meaningless measured values and uncertainty in the contact areas. An AFM cantilever is used after having been modified with a micro glass bead to enlarge the contact area for adhesion. A glass plate with micro-scale circular patterns is fabricated from a glass wafer by micro-machining processes in order to control precisely the contact area in adhesion tests. In the proposed method the adhesive materials are directly applied to the bead attached at the AFM cantilever before it is applied on the top area of the truncated cone on the fabricated glass plate. The developed method is applied to measure the adhesive forces of Cell-Tak® (which is a commercial extracted mussel adhesive) and recombinant Mgfp-5 (which is a recombinant mussel adhesive protein) and the statistical credibility of the measured adhesive force data is enormously improved as a result.     

新型改性玉米淀粉粘合剂的研制

介绍一种以玉米淀粉为主要原料,经过改性制备瓦楞纸粘合剂的方法.该法制得的粘合剂性能好,成本低,使用操作方便,尤其适用小规模、单机生产.     

高岭土合成无粘结剂A型分子筛的探索性研究

对高岭土进行了物性分析，并进行了以高岭土为原料合成高强度，高性能的无粘结剂Ａ型分子筛的探索性试验，同时考察了反应时间对结晶度的影响。     

关于化工专业英语翻译的探讨

随着化学工业的快速进步,我国很多老旧的技术和设备都需要更新与改造。此外,我国在化学工艺方面与西方国家进行了大量的交流与沟通,这就要求化学工业相关的工作人员需要具备基本的化学专业英语,并熟悉其翻译的方式。化工专业英语是一种专业性非常强的英语,其不仅具有英语的基本语言特点,而且具有其独特性。     

硼硅树脂改性厌氧胶黏剂耐热性能研究

采用含有不饱和双键的烷氧基硅烷与硼酸通过直接缩合反应合成了一种硼硅树脂(B-Si resin),采用FTIR、TG对硼硅树脂的结构及耐热稳定性能进行了表征。制备的硼硅树脂的急剧热失重温度可达400℃以上。将硼硅树脂与乙氧化双酚A二甲基丙烯酸酯和间苯撑双马来酰亚胺相匹配制备一种耐高温厌氧胶,该厌氧胶具有良好的耐热稳定性能,在400℃高温下或在400℃老化2h之后,仍具有良好的粘接强度。