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Bragg’s interval

Knowledge of Bragg s interval values for clusters and the loosely packed matrix gives the possibility to calculate characteristic values of the intermolecular distance d for them according to Equation 4.10. The estimations given by the authors [3] showed that for clusters it was 6 A, for a loosely packed matrix 7 A and within experimental error was independent of K. The absolute magnitude of obtained values of d corresponded reasonably to the known literary data [7]. [Pg.198]

As earlier, we attribute the halo component, which corresponds to the largest value of Bragg s interval with a loosely packed matrix. In this case d 2 and d characterise physical entanglements of the cluster network [23]. Since the values of d 2 for EP-2, EP-3 and EP-4 are sufficiently close (particularly at small modifier concentrations) then this parameter can be attributed to entanglements (clusters) formed by EP network segments. Then d corresponds to the network of physical entanglements formed at the expense of interaction of adamantane fragments [22]. [Pg.204]

In turn, the macromolecule effective diameter dj can be determined from Bragg s interval value d according to Equation 4.10. Simulating the crosslinked epoxy polymer macromolecule as a cylinder and using experimental values and d, the important molecular characteristics 5 and can be estimated [23]. [Pg.204]

In Figure 5.9 the dependences of the amplitude intensity of the third component of the amorphous halo and Bragg s interval value, corresponding to the entanglements network of adamantane fragments, on modifier contents are adduced. [Pg.208]

For independent estimation of the value of S the methods stated above [2], based on the application of wide angle X-ray diffractometry, can be used. Within the frameworks of this method an interconnection between Bragg s interval d, calculated... [Pg.209]

Figure 5.11 The dependence of Bragg s interval on the ratio curing agent oligomer for epoxy polymers EP-1 (1) and EP-2 (2) [31]... Figure 5.11 The dependence of Bragg s interval on the ratio curing agent oligomer for epoxy polymers EP-1 (1) and EP-2 (2) [31]...
A Debye-Scherrer camera consists of a metal cylinder provided with a photographic film. The primary beam is perpendicular to its axis. The distance between two symmetrical lines, produced by the intersection of a cone with the cylinder, is 46R, 6 being the Bragg angle (in radians) and R the radius of the camera. The interval is derived from Bragg s law. The powder method gives us only the norms of the reciprocal vectors. The set of norms corresponds to the projection of the reciprocal lattice onto a straight line. [Pg.128]

FIGURE 18.15 (cont d). (b) Three-dimensional plot of a transformation of aluminum fluoride in the temperature interval 25-750°C. The scan number corresponds to the temperature (in equal increments). This plot shows how fast the reaction occurs, and which Bragg reflections to use when studying the course of the reaction. Courtesy Glover A. Jones and M. R. Short, E. I. du Pont de Nemours and Company, Central Research and Development, C S and E. [Pg.808]

Unlike the Laue s case, the crystal s intermediate thickness domain can be restricted according to Eq. (5.141) at the interval (5.142) in the Bragg case. [Pg.553]


See other pages where Bragg’s interval is mentioned: [Pg.162]    [Pg.197]    [Pg.198]    [Pg.202]    [Pg.208]    [Pg.317]    [Pg.162]    [Pg.197]    [Pg.198]    [Pg.202]    [Pg.208]    [Pg.317]    [Pg.235]    [Pg.43]    [Pg.58]    [Pg.157]    [Pg.115]    [Pg.38]    [Pg.326]    [Pg.313]    [Pg.98]    [Pg.272]    [Pg.458]    [Pg.583]    [Pg.385]    [Pg.838]   
See also in sourсe #XX -- [ Pg.197 , Pg.202 , Pg.204 , Pg.208 , Pg.211 ]




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