Local order regions domains

In the model [98] it has been assiuned, that nucleus domain with size u is formed in defect-free part of semicrystalline polymer, that is, in crystallite. Within the frameworks of model [1] and in respect to these polymers amorphous phase structure such region is loosely packed matrix, surrounding a local order region (cluster), whose structure is close enough to defect-free polymer structure, postulated by the Flory felt model [16, 17]. In such treatment the value u can be determined as follows [43] ... 

Miller et al. have initiated studies to elucidate the kinetics of forming the ordered phase in the polypeptide solutions. When the isotropic solution is temperature-jumped across the biphasic region into the region in which the ordered phase is stable, the kinetics can be described by a nucleation and growth mechanism with many similarities to the kinetics of polymer crystallization. They have also shown that the kinetic process can be divided into two time scales the conversion of the randomly oriented rods to a random array of locally oriented rod domains, followed by growth of some domains at the expense of others. 

RDFs for class II materials have been obtained by Laridjani el al. [306]. The authors have compared the experimental results with calculated distribution functions, involving both intrachain and interchain contributions. For the latter they consider the crystalline lattices described previously as a starting point. The main conclusion is that there is considerable similarity of local order in crystalline and amorphous regions, for both F.B-ll and ES-II. In the amorphous phase, the range of this order is about 5 A, an order of magnitude smaller than the size of the crystalline domains. 

Optical studies of uniaxially aligned TLCP fibers, films and ribbons observed in the orthogonal position in polarized light exhibit a salt and pepper texture and incomplete extinction. Close examination of this structure shows a fine domain texture. The individual domains, about 0.5 /im in diameter, are regions of local order which can be seen in micrographs of thin sections (Fig. 5.87, color section). There is a slight color variation between domains which suggests they... 

The stractural mechanism of polymer nano composites filled with organoclay on supra segmental level was offered. Within the frameworks of these mechanism nanocomposites elasticity modulus is defined by local order domains (nano clusters) sizes similarly to natural nano composites (polymers). Densely packed interfacial regions formation in nano composites at nano filler introduction is the physical basis of nano clusters size decreasing. 

At the formation of the structure of crosslinked polymers one can observe the formation of dissipative structures (DS) of two levels - micro- and macro-DS. Micro-DS are local order domains (clusters) and their formation is due to the high viscosity of the reactive medium in the gelation period. As it is known [47], this results in turbulence of viscous media and subsequent formation of ordered regions. 

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