ISSN:
1573-8922
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. The values of the moduli of elasticity of the crystal lattices (along the axis of the chain) of polyimides DFOPF and DFOB were determined by means of x-ray diffraction. They turned out to be (21±1)·103 and (19±1)·103 kgf/mm2, respectively. The compliance co-efficients γ (calculated per one recurrent bond) and the force f required for stretching a single chain in the cell by 1% were also determined on the basis of the values of EC and data of the parameters of the elementary cells. 2. The values of EC and γ were calculated, making use of empirical data of the chain compliances of PMPF and PMB determined previously [1]. The experimental and calculated values of EC and γ agree with one another. 3. It was shown that the comparatively high values of EC of polyimides DFOPF and DFOB, which were observed in spite of the presence of a “hinge“ oxygen atom in the recurrent bond, is explained by the specific disposition of the “hinge“ atom in the dianhydride component.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00866677
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