ISSN:0032-3888    

DOI:10.1002/pen.760010302

出版商:Society of Plastics Engineers, Inc.    

年代:1961

数据来源: WILEY

ISSN:0032-3888    

DOI:10.1002/pen.760010303

出版商:Society of Plastics Engineers, Inc.    

年代:1961

数据来源: WILEY

摘要:

AbstractFor resins of room temperature density 0.91 to 0.96 g/cc, enthaply and internal energy diagrams have been developed from 0 to 200°C and up to 1000 atmospheres. These diagrams can be used for estimating properties for which data are not available, and provide unified view of many properties of polyethylene under conditions of fabrication and use. Extent of crystallinity estimates can be made from enthalpy, internal energy, specific volume, compressibility and melting point data provided for hypothetical amorphous, crystalline and actual resins

ISSN:0032-3888    

DOI:10.1002/pen.760010304

出版商:Society of Plastics Engineers, Inc.    

年代:1961

数据来源: WILEY

摘要:

AbstractThe Griffith theory for brittle fracture predicts that the tensile strength should be inversely proportional to the square root of the size of a defect or flaw in the sample tested. The validity of this relation has been investigated for the glassy polymers, poly(methyl methacrylate) and polystrene. The results indicate that the strength of the polymers depends on two factors: (1) the surface energy, and (2) the inherent flaw size. The surface energy is primarily that dissipated in a viscous flow process and the inherent flaw size is related to the tendency of the polymer to craze under stress.

ISSN:0032-3888    

DOI:10.1002/pen.760010305

出版商:Society of Plastics Engineers, Inc.    

年代:1961

数据来源: WILEY

摘要:

AbstractFlow patterns in the channel of a screw extruder have been investigated in a study utilizing a model extruder with stationary screw and a rotating, transparent barrel. Photographs of flow streamlines at conditions over the full range of output restriction are presented for a non‐Newtonian fluid. A technique employing photographs of particle tracers was used with the same apparatus to permit quantitative measurement of velocity profiles with both a Newtonian and a non‐Newtonian fl

ISSN:0032-3888    

DOI:10.1002/pen.760010306

出版商:Society of Plastics Engineers, Inc.    

年代:1961

数据来源: WILEY

摘要:

AbstractThe mechanism of formation of tubular polythene film is a complicated process, and extensive studies have shown that the properties of the film made are influenced profoundly and in a complex way both by the processing conditions used by certain design features of the equipment. Studies of the effect of the extrusion variables on the more important film properties, both optical and mechanical, are reviewed in this paper. The results are discussed in terms of the fundamental nature of polythene film, its surface, its crystalline structure and its orientation.

ISSN:0032-3888    

DOI:10.1002/pen.760010307

出版商:Society of Plastics Engineers, Inc.    

年代:1961

数据来源: WILEY

摘要:

AbstractTwelve plastics representing various chemical structures were studied as part of a program to determine the utility of plastics as packaging materials in the high radiation presentation of food. The plastics were exposed to selected dosages of Cobalt‐60 gamma radiation in vacuum and in air. Gas evolution and changes in infrared spectra as a result of irradiation were used to hypothesize the relative stability of these plastics to irradiation. Based on these facts it was found that plastics containing conjugated ring systems, ionic linkages, and chlorine in side groups were the most stabl

ISSN:0032-3888    

DOI:10.1002/pen.760010308

出版商:Society of Plastics Engineers, Inc.    

年代:1961

数据来源: WILEY

摘要:

AbstractA new series of inorganic‐organic high polymers have been synthesized namely; the metaloxene polymers of phenolaldehyde. Titanium (IV), Zirconium (IV) and Hafnium (IV) phenolaldehyde have been prepared and other metals especially the refractory type metals may merit further development as calorobic plastic materials. The hafnium resin has been compression molded into a rocket‐nozzle insert shape with satisfactory rocket‐firing re

ISSN:0032-3888    

DOI:10.1002/pen.760010309

出版商:Society of Plastics Engineers, Inc.    

年代:1961

数据来源: WILEY

摘要:

AbstractThis article describes preparation of resins as described in the title above, and the effect of concentration of the diepoxide, dimer acid, and initiator (stannous octoate). Proportion of dimer acid and diepoxide has a marked influence on hardness and tensile properties of resins. Change in tensile properties upon aging correlates very well with change in hardness. Higher proportions of dimer acid produce softer, more flexible resins. The resins have unique electrical properties at temperature up to 175°C, apparently because of the high proportion of hydrocarbon in the resin

ISSN:0032-3888    

DOI:10.1002/pen.760010310

出版商:Society of Plastics Engineers, Inc.    

年代:1961

数据来源: WILEY

ISSN:0032-3888    

DOI:10.1002/pen.760010311

出版商:Society of Plastics Engineers, Inc.    

年代:1961

数据来源: WILEY