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• 1
Electronic Resource
s.l. : American Chemical Society
Source: ACS Legacy Archives
Topics: Chemistry and Pharmacology , Physics
Type of Medium: Electronic Resource
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• 2
Electronic Resource
s.l. : American Chemical Society
Source: ACS Legacy Archives
Topics: Chemistry and Pharmacology , Physics
Type of Medium: Electronic Resource
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• 3
Electronic Resource
New York : Wiley-Blackwell
ISSN: 0449-2986
Keywords: Chemistry ; Polymer and Materials Science
Source: Wiley InterScience Backfile Collection 1832-2000
Topics: Chemistry and Pharmacology
Type of Medium: Electronic Resource
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• 4
Electronic Resource
s.l. : American Chemical Society
Analytical chemistry 24 (1952), S. 1206-1207
ISSN: 1520-6882
Source: ACS Legacy Archives
Topics: Chemistry and Pharmacology
Type of Medium: Electronic Resource
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• 5
Electronic Resource
Stamford, Conn. [u.a.] : Wiley-Blackwell
Polymer Engineering and Science 16 (1976), S. 294-297
ISSN: 0032-3888
Keywords: Chemistry ; Chemical Engineering
Source: Wiley InterScience Backfile Collection 1832-2000
Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
Type of Medium: Electronic Resource
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• 6
Electronic Resource
Stamford, Conn. [u.a.] : Wiley-Blackwell
Polymer Engineering and Science 16 (1976), S. 334-343
ISSN: 0032-3888
Keywords: Chemistry ; Chemical Engineering
Source: Wiley InterScience Backfile Collection 1832-2000
Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
Notes: Constitutive relationships are presented to relate the directional dependence of the mechanical properties of anisotropic, partially crystalline polymers to (a) the percent crystallinity, (b) characteristics of the crystalline and amorphous orientation distribution, and (c) the mechanical properties of the crystalline and amorphous components. These relationships were tested with structural and dynamic mechanical data obtained for isotactic polypropylene films in various states of crystalline and amorphous orientation. The dynamic mechanical properties of the crystalline and amorphous components were treated as parameters and evaluated from dynamic mechanical measurements along the longitudinal and transverse direction of three different film samples. These mechanical parameters, and the associated structural parameters, were in turn used to predict the dynamic mechanical spectra for a fourth, independent, film sample. The predicted values for the storage and loss modulus, along various directions of loading, were within 10 percent of the measured values over the temperature range of -80°C to 80°C.
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• 7
Electronic Resource
Stamford, Conn. [u.a.] : Wiley-Blackwell
Polymer Engineering and Science 16 (1976), S. 293-293
ISSN: 0032-3888
Keywords: Chemistry ; Chemical Engineering
Source: Wiley InterScience Backfile Collection 1832-2000
Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
Type of Medium: Electronic Resource
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• 8
Electronic Resource
Stamford, Conn. [u.a.] : Wiley-Blackwell
Polymer Engineering and Science 16 (1976), S. 371-387
ISSN: 0032-3888
Keywords: Chemistry ; Chemical Engineering
Source: Wiley InterScience Backfile Collection 1832-2000
Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
Notes: A four-stage synthesis of molecular, micromechanical, and macromechanical models is used to predict the dependence of the longitudinal and transverse Young's moduli and the axial and transverse shear moduli of anisotropic polyethylene on percent crystallinity and the state of molecular orientation. Variational methods are employed to establish the upper and lower limits for anisotropic elastic response. The difference between lower and upper bound limits is interpreted as the potential for improving mechanical performance. A modified form of the Tsai-Halpin equation is used to examine parametric ranging (via a contiguity factor, ξ) between the lower and Tupper bound limits. In this application, the contiguity factor is interpreted as a characteristic of the internal stress-strain distribution which is dependent upon the size, shape, packing geometry, and elastic properties of the crystalline and amorphous regions. The potential for achieving high modulus polymeric materials is illustrated by treating percent crystallinity, molecular orientation, and contiguity as materials design variables subject to control by processing conditions. Optimum property trade-offs, necessary for balancing the over all mechanical behavior of anisotropic materials, are illustrated through the control of orientation and contiguity, The theoretical predictions for the moduli of anisotropic polyethylene are in good agreement with values reported for material processed by traditional procedures as well as ultra-oriented polyethylene.
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• 9
Electronic Resource
Bognor Regis [u.a.] : Wiley-Blackwell
ISSN: 0887-6266
Keywords: Chemistry ; Polymer and Materials Science
Source: Wiley InterScience Backfile Collection 1832-2000
Topics: Chemistry and Pharmacology , Physics
Notes: Monte Carlo simulations based on the rotational isomeric model are used to investigate the influence of a neutral surface on the structural and thermodynamic descriptors of polymethylene chains on and in the vicinity of the surface. For large chains, the results of the simulations are replicated by a properly scaled distribution based on a random walk with absorbing barriers. Accordingly, the affects noted for the trial polymethylene system may be extended to other molecules.The perturbations in the geometry of the chain were confined to the components of the various descriptors perpendicular to the surface; the radial components were unaffected by the neutral surfaces. The perturbations induced by the neutral surfaces extend to chains whose origins were within about $$10\left\langle {s_x \left( \infty \right)^2 } \right\rangle ^{1/2}$$, where $$\left\langle {s_x \left( \infty \right)^2 } \right\rangle ^{1/2}$$ is the perpendicular component of the mean square radius of gyration of an unperturbed chain.In contrast, the average bond conformation, the associated internal energy, and the variance of the internal energy distribution are unaffected by a neutral surface. The major thermodynamic effect is manifest through the entropy arising from the reductions in accessible chain configurations due to the neutral barrier.
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• 10
Electronic Resource
New York, NY [u.a.] : Wiley-Blackwell
Journal of Applied Polymer Science 52 (1994), S. 1241-1248
ISSN: 0021-8995
Keywords: Chemistry ; Polymer and Materials Science
Source: Wiley InterScience Backfile Collection 1832-2000
Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
Notes: A number of studies on thermosetting polymeric composite materials have indicated the existence of a three dimensional region of the matrix in the vicinity of the fiber, which exhibits distinct properties. A key factor in the interphase formation of epoxy-diamine mixtures is the diffusivity of the diamine relative to the epoxy prepolymer. A technique for measuring diffusion coefficients of a liquid through solid polymeric thin layers is described. Infrared attenuated total reflectance (ATR) spectroscopy is used to analyze diffusion couples with infrared distinguishable bands. A cylindrical germanium crystal, coated with the polymeric layer of interest, is immersed in a boat cell filled with the diffusant, and infrared spectra of the system are taken in real time. By those means, only the region close to the solid surface is scanned without interferences from the bulk. The temperature dependence of diffusivity can also be evaluated by the use of a heated cell. Diffusivities that are evaluated in this way can be used to predict stoichiometric gradients during the curing reaction of the system and, therefore, the structure and property gradients of the material around the fiber. © 1994 John Wiley & Sons, Inc.