properties of polymers and composites

... Library of Congress Cataloging-In-Publitation Date Nielsen Lawrence E Mechanical properties of polymers and composites / Lawrence E Nielsen Robert F Landel — 2nd ed., rev and expanded p cm ... MECHANICAL PROPERTIES OF POLYMERS AND COMPOSITES SECOND EDITION,REVISED AND EXPANDED LAWRENCE E.NIELSEN Monsanto Company St Louis Missouri F LANDEL Jet Propulsion Laboratory California institute of Technology ... Effect of MokcLil.ir Weight Effect of Cross-linking Effects of Crystallinity and Morphology Effects of Plasticizcrs and Copolymerization Effect of Molecular Orientation Effect of Strength of Intcrmolccular...

Ngày tải lên: 22/03/2014, 12:20

... Library of Congress Cataloging-In-Publitation Date Nielsen Lawrence E Mechanical properties of polymers and composites / Lawrence E Nielsen Robert F Landel — 2nd ed., rev and expanded p cm ... MECHANICAL PROPERTIES OF POLYMERS AND COMPOSITES SECOND EDITION,REVISED AND EXPANDED LAWRENCE E.NIELSEN Monsanto Company St Louis Missouri F LANDEL Jet Propulsion Laboratory California institute of Technology ... Effect of MokcLil.ir Weight Effect of Cross-linking Effects of Crystallinity and Morphology Effects of Plasticizcrs and Copolymerization Effect of Molecular Orientation Effect of Strength of Intcrmolccular...

Ngày tải lên: 22/03/2014, 13:20

... Library of Congress Cataloging-In-Publitation Date Nielsen Lawrence E Mechanical properties of polymers and composites / Lawrence E Nielsen Robert F Landel — 2nd ed., rev and expanded p cm ... MECHANICAL PROPERTIES OF POLYMERS AND COMPOSITES SECOND EDITION,REVISED AND EXPANDED LAWRENCE E.NIELSEN Monsanto Company St Louis Missouri F LANDEL Jet Propulsion Laboratory California institute of Technology ... Effect of MokcLil.ir Weight Effect of Cross-linking Effects of Crystallinity and Morphology Effects of Plasticizcrs and Copolymerization Effect of Molecular Orientation Effect of Strength of Intcrmolccular...

Ngày tải lên: 26/06/2014, 23:20

... Library of Congress Cataloging-In-Publitation Date Nielsen Lawrence E Mechanical properties of polymers and composites / Lawrence E Nielsen Robert F Landel — 2nd ed., rev and expanded p cm ... MECHANICAL PROPERTIES OF POLYMERS AND COMPOSITES SECOND EDITION,REVISED AND EXPANDED LAWRENCE E.NIELSEN Monsanto Company St Louis Missouri F LANDEL Jet Propulsion Laboratory California institute of Technology ... Effect of MokcLil.ir Weight Effect of Cross-linking Effects of Crystallinity and Morphology Effects of Plasticizcrs and Copolymerization Effect of Molecular Orientation Effect of Strength of Intcrmolccular...

Ngày tải lên: 27/06/2014, 17:20

... Library of Congress Cataloging-In-Publitation Date Nielsen Lawrence E Mechanical properties of polymers and composites / Lawrence E Nielsen Robert F Landel — 2nd ed., rev and expanded p cm ... MECHANICAL PROPERTIES OF POLYMERS AND COMPOSITES SECOND EDITION,REVISED AND EXPANDED LAWRENCE E.NIELSEN Monsanto Company St Louis Missouri F LANDEL Jet Propulsion Laboratory California institute of Technology ... Effect of MokcLil.ir Weight Effect of Cross-linking Effects of Crystallinity and Morphology Effects of Plasticizcrs and Copolymerization Effect of Molecular Orientation Effect of Strength of Intcrmolccular...

Ngày tải lên: 13/08/2014, 16:21

... has a yield point and is typical of a material that cold-draws with necking down of the cross section in a limited area of the specimen Curves of the third graph (C) arc typical of elastomeric materials ... between the applied stress and strain is landa, and it is defined by a ratio called the loss tangent or dissipation factor: Tan landa, a damping term, is a measure of the ratio of energy dissipated ... tests have traditionally been the most popular and universally used of alt mechanical tests and are described by ASTM standard Vests such as D638, D882, and D412 These tests can be more difficult...

Ngày tải lên: 13/08/2014, 16:21

... moderate rates of deformation, the amorphous polymer is soft and flexible and is either an elastomer or a very viscous l i q u i d , Mechanical properties show profound changes in the region of the glass ... between 1.0 and 1.2; it is a function of the ratio of segmental mobilities of crosslinked to uncross-linked polymer units and the relative cohesive energy densities of cross-linked and uncross-linked ... by the pairs of polymers polypropylene ( T g = C) and polyisobutylene (Tg = -70 C), and poly(vinyi chloride) (Tg=87 C) and poly(vinylidene chloride) (Tg =- 19°C) The symmetrical polymers have...

Ngày tải lên: 13/08/2014, 16:21

... Viscoelastic properties of Polymers, 3rd ed., Wiley New York, 1980 I , n, Nielsen Mechanical Properties of Polymers Van Nostrand Reinhold, New York 1962 J V Schinit/., I-'d,, Testing / Polymers, ... points of many common polymers More complete tables of melting points and heats of fusions may be found in Refs 4, 38, 140, and 141 Chemical structure factors affect the melting point and glass ... Graessley L Mandelkern, and J Koenig, P/ivsical Properties of Polymers, American Chemical Society, Washington, D.C., 1984 J I I Gibbs and E A DiMarzio, J Chem Phys 28, 373 (1958) G Adams and J I...

Ngày tải lên: 13/08/2014, 16:21

... point to point and is a combination of uniaxial and biaxial orientation A second type of anisotropic system is the biaxially oriented or planar random anisotropic system This type of material is ... is applied, and Lo the unstretched length of the specimen Equation (6) also applies to and gives one of the moduli of anisotropic materials if the applied stress is parallel to one of the principal ... deflection V is measured and the Young's modulus E is calculated as follows: where C and D are the width and thickness of the specimen (11,12) This flexure test often gives values of the Young's modulus...

Ngày tải lên: 13/08/2014, 16:21

... weight and molecular weight distribution, degree of cross-linking, and of Plasticization For two-phase and multiphase systems such as semicrystalline polymers and polymer blends, morphology and ... comparisons of the responses of a set of polymers (7,16,54-56) These frequency/time response curves serve to delineate the effects of changes in backbone structure (i.e., the type of polymer or ... seldom made and there is no equivalent to the characteristic time of Figure 5A) In this section we summarize the effect of structural and compositional factors on the modulus of the simplest of amorphous...

Ngày tải lên: 13/08/2014, 16:21

... those of random copolymers, having a single T^ value and modulus transition zone TK varies rather regularly with composition, often following the simple rule of mixtures The rubbery plateau and ... detail in later chapters E Block and Graft Polymers and Polyblends In a few cases mixtures of two polymers are soluble in one another, where there is a close match of the solubility parameters or ... however, mixtures of two polymers arc insoluble in one another and form two-phase systems (91-104) Block and graft polymers, in Elastic Moduli 55 which there are long sequences of each homopolymer,...

Ngày tải lên: 13/08/2014, 16:21

... is used When the stresses and strains become large and the stress-strain curve becomes nonlinear, simple descriptions of the response and interconversions between creep and relaxation become increasingly ... general creep and stress-relaxation behavior of polymers except that the time scales are greatly collapsed in the models compared to actual materials In the models most of the in- Creep and Stress ... unit, which consists of a Hookean spring and a Newtonian dashpot in series as shown in the insert in Figure The modulus or stiffness of the spring is E, and the viscosity of the dashpot is r\...

Ngày tải lên: 13/08/2014, 16:21

... amorphous polymers is or less accurately, using the average value of Au from many polymers, of 4.S x H) ' K \ is the difference between the liquid and glassy volumetric expansion coefficients and the ... /,, f 10 K and abftut 100 K above 7^, Above this temperature, for thermally stable polymers, Berry and Fox (28) have shown that a useful extension of the WLF equation is the addition of an Arrhenius ... characteristic of very high-molecular-wcight Creep and Stress Relaxation 79 polymers and is due to chain entanglements, which act as temporary crosslinks (sec Figure 2.5) Since time and temperature...

Ngày tải lên: 13/08/2014, 16:21

... rigid amorphous polymers should be proportional to may be related to the For brittle polymers, the value of onset of crazing Equations (32) and (33) imply that factorizability holds and that an ... Annealing can reduce the creep of crystalline polymers in the same manner as for glassy polymers (89,94,102) For example, the properties of a quenched specimen of low-density polyethylene will ... point and Thus for crystalline polymers the cause of the decreased creep must be associated with the degree of Crystallinity, secondary crystallization, and changes in the crystallite morphology and...

Ngày tải lên: 13/08/2014, 16:21

... weight of the blend, and is the weight-average molecular weight of component / The steady-state creep compliance of the blend is Creep and Stress Relaxation 97 The stress relaxation shear modulus of ... state and the steady-state compliance, but the star polymers also decrease the rate of stress relaxation (and creep) compared to a linear polymer (169) The decrease in creep and relaxation rate of ... entanglements because of the many long branches, or the effect can be due to the suppression of reptation of the branches Linear polymers can reptate, but the bulky center of the star and the different...

Ngày tải lên: 13/08/2014, 16:21

... that of nylon by Yoshitomi et (223) and Onogi et (224), that of poly(vinyl acetals) by Fujino et (214), and that of fluorinated polymers by Nagamatsu and co-workers (225,226) The creep of poly(vinyl ... polybutadiene (195) and plasticized methacrylate (196) Farlie (197) has measured both the rate of creep and the rate of stress relaxation of natural rubber as a function of the degree of cross-linking ... treatment of the effect of chemical crosslinks in reducing the number of entanglements would remove the slight hump seen in the calculated curves of Figures 18 and 19 The chemical nature of the...

Ngày tải lên: 13/08/2014, 16:21

... amount of Creep and Stress Relaxation 115 Crystallinity—about.i to 15% (213,232) The creep of plasticized poly(vinyl chloride) polymers as a function of temperature, concentration, and kind of plasticizer ... the value of the two polymers, the blockiness of the chain, the compatibility of the two components, and the morphology of the resulting two-phase system Thus for di- or triblocks of the AB or ... and graft polymers and polyblends, are discussed in detail in Chapter However, the creep and stress-relaxation behavior of these materials will be examined at this point Most of the systems of...

Ngày tải lên: 13/08/2014, 16:21

Ngày tải lên: 13/08/2014, 16:21

... Donald G LeGrand and John T Bendler Handbook of Polyethylene: Structures, Properties, and Applications, Andrew J Peacock Polymer and Composite Rheology: Second Edition, Revised and Expanded, Rakesh ... composites, and biomedical materials by means of electron and atomic force microscopy His special field of interest is the study of toughness enhancement and of the mechanisms of deformation and ... Prediction of Polymer Properties: Third Edition, Revised and Expanded, Jozef Bicerano Fundamentals of Polymer Engineering, Anil Kumar and Rakesh K Gupta Handbook of Polypropylene and Polymer,...

Ngày tải lên: 04/06/2014, 14:26