Mechanical properties of polymers and composites-Nielsen Episode 14 pptx
Mechanical properties of polymers and composites-Nielsen Episode 1 doc
... all of the major mechanical properties of polymers:
l_ Molecular weight
2.
Cross-linking and branching
3.
Crystallinity and crystal morphology
4.
Copolymerization (random, block, and ... t h e mechanical properties of polymers very complex
if it were not for some general phenomena and principles that underlie all
of these various properties and determ...
Mechanical properties of polymers and composites-Nielsen Episode 2 pot
... 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, ... variety of
units are used in reporting values of mechanical tests. Stresses, moduli of
elasticity, and other properties are given in such units as MK.S (SI), cgs,...
Mechanical properties of polymers and composites-Nielsen Episode 3 potx
... Tg value of poly(vinyl
acetate) at the rate of 0.,22 K'MPa (0.22C/atm). The' Tg value of polyfvinyl
chloride) increases by 0 .14 K/MPn (f).( )14
fi
C/atm). while the rate of increase ... copolymers. the distribution of A A. BB and AB sequences
is important in determining Tg ( 1 0 3 . 1 0 5 . 1 0 9 ) . Random copoly mers
generally do not have the same Tg values as c...
Mechanical properties of polymers and composites-Nielsen Episode 4 pdf
... behavior of polymers,
and since these factors can be varied over a wide range, the mechani-
cal properties of crystalline polymers take on a bewildering array of
possibilities.
The nature of the mechanical ...
1948.
3. J I), Ferry. Viscoelastic properties of Polymers, 3rd ed., Wiley. New York,
1980.
4. I , n, Nielsen. Mechanical Properties of Polymers. Van N...
Mechanical properties of polymers and composites-Nielsen Episode 5 doc
... all directions. Unoriented amorphous
polymers and annealed glasses are examples of such materials. They have
only one of each of the three kinds of moduli, and since the moduli are
interrelated, ... density of the material making up the beam of total
mass m, P the period of the oscillation, f
H
the frequency of the vibrations
in hertz or cycles per second, and / the r...
Mechanical properties of polymers and composites-Nielsen Episode 6 doc
... 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 (i....
Mechanical properties of polymers and composites-Nielsen Episode 7 pdf
... 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 ... plateau.
Plasticizers and Copolymerization also shift the glass transition responses
of the amorphous phase of crystalline polymers. In addition, the degree
of Crystallinity...
Mechanical properties of polymers and composites-Nielsen Episode 8 docx
... 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 ... unit, which consists
of a Hookean spring and a Newtonian dashpot in series as shown in the
insert in Figure 1. The modulus or stiffness of the spring is E, and the
viscosi...
Mechanical properties of polymers and composites-Nielsen Episode 9 doc
... 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 ... 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 equation...
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