Domain morphology

DOI. See Distinctness of image (DOI) Domain morphology, 217-222 DPCP. See Diphenylchlorophosphate (DPCP)... 

Fig. 1. Schematic representation of two-phase domain morphology for segmented copolymers 51 158)...

Similar observations have been made with respect to the hysteresis behavior in segmented urethanes as a function of composition and domain morphology. 

Figure 8.13 Chemical image analysis tools use domain morphology to highlight caffeine domains in the tablet.

Two-phase domain morphology, of approximately spherical shape, comprising two polymers, each in separate phase domains, in which phase domains of one polymer completely encapsulate the phase domains of the other polymer. 

Le Grand (36) has developed a model to account for domain formation and stability based on the change in free energy which occurs between a random mixture of block copolymer molecules and a micellar domain structure. The model also considers contributions to the free energy of the domain morphology resulting from the interfacial boundary between phases and elastic deformation of the domains. 

Meier (9) has modeled the spherical domain morphology by a simple cubic lattice in which domains are arranged on the lattice sites. The tie molecules run between nearest-neighbor domains and are assumed to be confined by pairs of infinite, parallel walls. The extension ratio for the interdomain region is set equal to the macroscopic extension ratio divided by the volume fraction of the interdomain material. The ratio of the initial interdomain dimension to the domain dimension is set equal to the ratio of the volume fractions of the interdomain and domain material. Using this three-chain model, Meier calculates the stress-strain relation by differentiating his entropy expression with respect to the interdomain extension ratio. The Meier calculation has some difficulties the interdomain deformation fails to vanish in the absence of an applied macroscopic deformation the relation between the ratio of the domain dimension to the initial interdomain dimension and the ratio of volume fractions is incorrect and the differentiation should be carried out with respect to the macroscopic extension ratio. 

Gaylord and Lohse (10) have calculated the stress-strain relation for cilia and tie molecules in a spherical domain morphology using the same type of three-chain model as Meier. It is assumed that the overall sample deformation is affine while the domains are undeformable. It is predicted that the stress increases rapidly with increasing strain for both types of chains. The rate of stress rise is greatly accelerated as the ratio of the domain thickness to the initial interdomain separation increases. The results indicate that it is not correct to use the stress-strain equation obtained by Gaussian elasticity theory, even if it is multiplied by a filler effect correction term. No connection is made between the initial dimensions and the volume fractions of the domain and interdomain material in this theory. 

Partial Molar Elastic Free Energy of Swelling. Leonard (8) calculated the partial molar elastic free energy of swelling for an interdomain tie molecule in a spherical domain morphology. He included the entropy... 

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