摘要:

AbstractEquations are derived for stress–strain curves for a hypothetical model substance containing a large number of like systems, each assumed to be in equilibrium between two states having different arrangements of the atoms. With this model one can study the dependence of the initial elastic modulus, the limiting strain (for infinite stress), and the over‐all shape of the stress–strain curve on characteristics of the rearranging systems—their number, the initial energy difference between the two states, the shift of atomic positions, etc. Introduction of an assumed proportionality between the shift per rearrangement and the square of the relative length of the sample (in the direction of the shift) leads to stress–strain curves similar to those determined experimentally for natural rubber and other rubberlike

ISSN:0022-3832    

DOI:10.1002/pol.1946.120010101

出版商:Interscience Publishers, Inc.    

年代:1946

数据来源: WILEY

摘要:

AbstractPrevious observations make it probable that one or both ends of a longchain molecule produced by catalyzed vinyl polymerization contain fragments of the initiator. If one uses acid peroxides as initiators, these fragments can contain a carbonyl group. It is the purpose of this paper to investigate whether these carbonyl groups which are present only in a very small amount can be detected by infrared absorption. It seems that in the case of polystyrene initiated with benzoyl peroxide, infrared absorption spectra reveal the presence of a small amount of some carbonyl groups in the polymer. Their amount appears to be in agreement with chemical measurements and with the molecular weight of the material.

ISSN:0022-3832    

DOI:10.1002/pol.1946.120010102

出版商:Interscience Publishers, Inc.    

年代:1946

数据来源: WILEY

摘要:

AbstractReduced chicken feather keratin forms a soluble complex in neutral aqueous sodium alkylbenzenesulfonate (average: dodecylbenzenesulfonate). The chemical composition, specific refractive increment, partial specific volume, electrophoretic mobility, osmotic pressure, diffusion constants, and ultracentrifugal sedimentation of the complex have been studied. The complex is heterogeneous but similar to egg albumin–sodium alkylbenzenesulfonate mixtures previously studied in general properties, including fiber‐forming properties, the average molecular weight of the dispersed protein units, and the relative symmetry of the dispersed units in dilute solut

ISSN:0022-3832    

DOI:10.1002/pol.1946.120010103

出版商:Interscience Publishers, Inc.    

年代:1946

数据来源: WILEY

摘要:

AbstractUsing the copolymer composition equation, the critical constants α and β are determined for the systems styrene–2,5‐dichlorostyrene, styrene–methyl acrylate, styrene–diethyl maleate, and styrene–diethyl ch

ISSN:0022-3832    

DOI:10.1002/pol.1946.120010104

出版商:Interscience Publishers, Inc.    

年代:1946

数据来源: WILEY

摘要:

AbstractResults are reported of experiments designed to delineate more clearly the action of retarders and chain transfer agents and to place different labeled end groups at either end of polystyrene molecules.

ISSN:0022-3832    

DOI:10.1002/pol.1946.120010105

出版商:Interscience Publishers, Inc.    

年代:1946

数据来源: WILEY

ISSN:0022-3832    

DOI:10.1002/pol.1946.120010106

出版商:Interscience Publishers, Inc.    

年代:1946

数据来源: WILEY

摘要:

AbstractFurther experimental evidence is given which indicates that, when a dilute solution of GR‐S is mixed with carbon black, certain fractions of the rubber are preferentially adsorbed by the black. After removal of the carbon black and the adsorbed fractions by centrifuging, the “treated” GR‐S is obtained by precipitation from the solution. Samples compounded as GR‐S gum stock show increasing modulus with increasing amounts of carbon black used for adsorption treatment. However, when the GR‐S thus treated is compounded with carbon black, then the effect is reversed. The more black used in the treatment and the higher the modulus of the gum stock, the lower the modulus of l

ISSN:0022-3832    

DOI:10.1002/pol.1946.120010107

出版商:Interscience Publishers, Inc.    

年代:1946

数据来源: WILEY