Amorphous behavior

Up to the early 1990s, the only rare earth boride known with RB (n > 12) was RB66. These compounds have been primarily studied for their interesting structure and structurally derived features like the amorphous behavior of thermal properties. However, in a recent development, new higher borides have been discovered like the RB25 and RB50 compounds. Furthermore, with addition of small amounts of 3rd elements like C, N, Si, the boron cluster framework was found to arrange... 

Choudhaiy, S., Sengwa, R. J. (2014). Intercalated clay structures and amorphous behavior of solution cast and melt pressed poly(ethylene oxlde)-clay nanocomposites,/ Appl. Polym. Set, 131(4), DOI 10.1002/ app.39898. 

Taken together, these studies support the conclusion that the importance of amorphous behavior of the protein and the additive is that it allows for effective hydrogen bonding between the additive and the protein. A glassy additive that does not have the interaction will not protect the protein against dehydration damages [12]. 

The crystallinity of PLA foams decreases with the o-lactic content but increases with CO2 content for semicrystalline PLA. Conversely, crystallinity does not develop in PLA foams with D-lactic content of 10%, confirming its amorphous behavior (Table 17.6). Low density achieved in semicrystalline PLA foamed at lower CO2 contents, particularly at conditions that lead to significant crystallinity development (i.e., 7% and 9%), results because the formation and growth of PLA crystal nuclei induced by CO2 in the extrusion die increases the foam nucleation density. In contrast, lower density foam requires high CO2 content for amorphous PLA. The paper neglected to include the number of cells nucleated in PLA [77]. 

In the microcrystallite model [38,39], the microcrystals (coherent scattering domains) are sufficiently small (15 to 20 A) to prevent the observation of Bragg reflections. In addition, strains ensure amorphous behavior. 

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