Mechanical properties of polymers and composites-Nielsen Episode 1 doc

... Copolymerization 18 1 IX. Effect of Molecular Orientation 18 8 X. Effect of Strength of Intcrmolccular Forced 19 4 XL Polyblends, Block, and # Graft Polymers m XH. Secondary Damping Peaks ' 282 Summary 212 Problems ... S0S Appendixes 515 I. Chemical Structure of Common Polymers 516 II. Conversion Factors for Moduli, Stress, and Viscosity 519 III. Glass Transition...

Ngày tải lên: 13/08/2014, 16:21

... bewildering number of mechanical tests and testing instru- m ents. Most of these tests are very specialized and have not been officially recognized as standardized tests. Some of these tests, however, ... standardized and are described in the publications of the American Society for Testing and Materials (1) . Many of the important tests for plastics are given as ASTM...

Ngày tải lên: 13/08/2014, 16:21

... be empirical constant ( 51. 96 .10 1 .10 2). Equation (43) has been used many limes for the Tg value of copolymers. (97 .10 3 .10 4), In copolymers. the distribution of A A. BB and AB sequences is important ... value of Tg for infinite molecular weight, in the 22 Chapter 1 value of plnsticized polymers is then given by ( 51. 96)' Equation ( 4 1 ) becomes equation (3...

Ngày tải lên: 13/08/2014, 16:21

... Techno!., 36, 14 67 (19 6 31. HI. O. .1 Pla/ek, J. Polymer Set A2. 6, 6 21 (l%8). . 11 . L. C. I:. Slruik, Rheol. Acta. 6. 11 9 (19 67). 12 . \V. S. Cramer. J Polymer S ci ., 26, 57 (19 57). 13 . A- J. ... volumes of this yearly series. 21. G. R. Irwin. J, Appl. Merit 61, A49 (10 39). 22. S. Mosiovoy and H. J. Ripling, J. Appl. Polymer Sci., 10 , 13 51 (19 66). 23. ASTM St...

Ngày tải lên: 13/08/2014, 16:21

... in Figure 1. 2. The resulting central deflection V is measured and the Young's mod- ulus E is calculated as follows: where C and D are the width and thickness of the specimen (11 ,12 ). This flexure ... calculated from the flexure of other kinds of beams. Examples are given in Table 1 (11 ,12 ). The table also gives equa- tions for calculating the maximum tensile stress a...

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... weight and molecular weight distribution, degree of cross-linking, and of Plasticization. For two-phase and multiphase systems such as semi- crystalline 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 (...

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... effect of any change in £ ()jr Copolymers and plasticized materials often show another effect—a broadening of the transition region with a decrease in the slope of the modulus curve in the region of ... Chapter 2 (10 4 ,11 6 ,11 7). A corresponding isothermal log E{t) versus log t plot would look very similar if it could be measured over the full glass-to-flow region. However, the...

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... amount of viscous creep, and in curve 11 1, viscous flow is a prominent part of the total creep. The same data were used in Figures 5 and 6, but notice the dramatic, change in the shapes of the ... relaxation of a Maxwell model (linear scales), T = 1 s. 3 Creep and Stress Relaxation I. INTRODUCTION Creep and stress-relaxation tests measure the dimensional stability of a m...

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... insert for Creep and Stress Relaxation 73 developed by Rouse (13 ), Zimm (14 ), Bueche (15 ,16 ), the Doi-Edwards (17 -19 ) school, the Bird-Curtiss- Armstrong (20) school, and others (1, 21) give a discrete ... ratio of a viscosity to a modulus, as in the spring-dashpot model of Figure 1, but each sprint! has the same (shear) modulus, and the steady-flow viscosity T] of equati...

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... and others (73 ,10 0), and ABS polymers have been studied also (87,93 ,10 1). Polypropylene has also been a popular polymer (92 ,10 2 ,10 3). Sharma studied a chlorinated poly- ethcr (Penton) (10 4) and ... that free volume controls changes in rate of creep or relaxation (11 8 -12 1). Crazing in glassy polymers greatly increases the creep and stress relax- ation (12 2 12 5). Th...

Ngày tải lên: 13/08/2014, 16:21