ISSN:0007-1641    

DOI:10.1002/pi.4980110202

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractReview of factors which govern the effectiveness of materials as adhesives. Begins with the forces available for adhesion, the roughness of surfaces, and the wetting and flow properties of liquids. Then the necessary phase change is considered and finally these requirements are correlated with actual classes of material.

ISSN:0007-1641    

DOI:10.1002/pi.4980110203

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

ISSN:0007-1641    

DOI:10.1002/pi.4980110204

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractSome information about the general and specific aspects of polychloroprene contact adhesive composition is given. Reference is made to application viscosity, the chemical and specific adhesive purpose of ingredients and performance related to composition and the method of stress. Some preliminary results, about the study of methods for determining how adhesive films form from complex mixtures are included.

ISSN:0007-1641    

DOI:10.1002/pi.4980110205

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractThe paper reviews the major developments published in the Patent literature over the last thirty years insofar as these reflect the evolution of the so‐called anaerobic and cyanoacrylate adhesives and the recent introduction of the ‘toughened’ acrylic adhesives.Reaction mechanisms are postulated and the problems of formulation and production discussed in detail together with the performance characteristics of the individual adhesive

ISSN:0007-1641    

DOI:10.1002/pi.4980110206

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractEpoxide resins were introduced commercially thirty‐three years ago. One of the first formulations was an adhesive. There has been continuous development of the systems since then based on an increasing range of materials used in their constitution and an increasing knowledge of their chemistry and cured properties. This paper examines some of the scientific topics that contribute to the present day knowledge of these high strength adhesives and that are now used when advances are sought in the technolog

ISSN:0007-1641    

DOI:10.1002/pi.4980110207

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractThe crystallinity of a series of ‘medium‐high’ green strength EPDM terpolymers has been examined by X‐ray diffraction and thermal analysis. It has been found that the crystallinity of such materials can vary from 0.20% as measured by thermal analysis, and depends on the E:P ratio in the polymer. It is also suggested that it depends on the distribution of E and P units. An explanation for the differing results obtained by thermal analysis and X‐ray diffraction has been proposed. The time taken to achieve maximum crystallinity varied for the series of polymers examined, and the improvement of crystallites continued over extensive periods of time. The final level of crystallinity in the polymers and the rate of changes occurring was temperature dependent. For one sampel (‘Nordel’ 1560) it was shown that crystallinity affected mechanic

ISSN:0007-1641    

DOI:10.1002/pi.4980110208

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

ISSN:0007-1641    

DOI:10.1002/pi.4980110209

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractIn view of the recent advances in the theory of sedimentation equilibrium, the meniscus depletion is reformulated and extended to reveal its potentialities. To cope with poly disperse materials such that fringes become unresolvable near the cell bottom, an extrapolation method is proposed using the newly defined average molecular weights at a given radial position. The main purpose of the method is to pave the way for determining the number‐average molecular weight of a sample. Its applications to a linear polystyrene sample having the weight‐average molecular weight of twenty seven million are reported in this paper. Uses and limitations of the present method are discussed in det

ISSN:0007-1641    

DOI:10.1002/pi.4980110210

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractGelatine gel samples formed in contact with phases of various polarity such as glass, plexiglass (PMMA) and air have been studied by a Röth‐type micro‐penetrometer. The experimental results showed that the penetrability of the gels was significantly effected by the adjacent phase. Comparing the data with those found on a freshly cut surface representing the bulk of the gel it can be assumed that the differences are caused by different orientation of the gelatine molecules in the penetrated region. In order to prove this assumption gels containing sodium chloride, sodium sulphate and sodium dodecyl sulphate, respectively were prepared. It has been shown that the rigidity of the gel/air surface and that of the bulk was effected similarly but not equally by the salts.In order to learn the processes occurring in presence of the above mentioned cosolutes turbidity measurements were carried out on all samples using a Pulfrich nephelom

ISSN:0007-1641    

DOI:10.1002/pi.4980110211

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY