Radial growth phase

Bani, M. R., Rak, J., Adachi, D., Wiltshire, R., Trent, J. M., Kerbel, R. S. and Ben-David, Y. (1996). Multiple features of advanced melanoma recapitulated in tumorigenic variants of early stage (radial growth phase) human melanoma cell lines evidence for a dominant phenotype. Cancer Res. 56, 3075-3086. 

Lentigo maHgna is a flat, multicolored, pigmented lesion with an irregular shape that may be precancerous. It has a slow radial growth phase and its diameter can vary from a... 

The height and growth rate from the vapour phase are assumed to be identical for both amorphous and crystalline phases. Taking into account only the in-plane radial growth resulting from the lateral incorporation of amorphous material, the number dA of molecules incorporated into the crystalline spheruhte contained in a volume dV is Qr 2n Rh t) dR, where dR represents the increase of the radius and... 

The predictions of the coarsening theory that are embodied in Equation 12.3 are as follows. The temporal exponent for the rate of radial growth of the particle is 1/3. Therefore, the radius should vary with It is assumed that the total volume (Vxot) of the coarsening phase is invariant with time after the first-order transition (i.e., phase segregation). Therefore, the number of particles is proportional to According to Equation 12.3 then, the number of particles per unit volume, N, is proportional to... 

Figure 16.9 Radial growth rates of spherulites and the induction periods for spherulite growth of pure phase and blends of stereocomplexationable polymers as estimated from the respective POM images. Reprinted with permission from Ref [79] 2011, Nature Publishing Group.

PBT/poly(butylene succinate) (PBSu) blends appeared phase separated over the entire composition range [267] with limited ester exchange at the melt processing temperature (240 °C). PBSu is miscible with PEO, and when quenched from the melt to 50 °C, PBSu crystallized first with PEO spheruhtes crystaUizing within the crystal matrix of PBSu [268]. Similar results were observed with precrystaUization of PBSu at 95 °C, followed by quenching to 50 °C, except that the radial growth rate of the PEO spheruhtes was significantly reduced. 

The known theories dealing with the overall crystallization kinetics assume that the conversion of amorphous phase into crystalline phase occurs via radial growth of domains—spherulites—in the case of polymers. They do not apply to crystallization processes that do not occur via nucleation and radial growth of domains. 

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