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The principal mechanism found was chain disentanglement, which was supplemented by a very limited chain scission.
The data on the critical strain rate for chain fracture along with observations of precise midchain scission (as estimated from size exclusion chromatography), a limited overall chain deformation, and the role of accumulated energy (strain) in mechanochemical degradation, tend to imply that a hybrid model of polymer dynamics in elongational flows may be realistic.
These properties changed with increasing NBMA/NAM value resulted in a linear increase in corona chain unit density (ρAM) that limited chain mobility.
Limited chain extensibility of the short chains resulting from the deformation of the bond angles and bond lengths has lead to higher potential energies.
A study using plasticizers for both PA11 and the PLA shows that this discrepancy between the static interfacial tension and the observed morphology after dynamic mixing can be attributed directly to the limited chain mobility of the stiff PLA molecule, particularly under quiescent conditions, which inhibits the available functional groups from interacting at the interface.
Jurenka [ 5, 66] suggests that this kind of limited chain shortening takes place in the peroxisomes.
After the palmitate has undergone ∆11 desaturation in the A. segetum pheromone gland, it is subject to limited chain shortening by β-oxidation, resulting in three homologous fatty-acyl pheromone precursors with 14C, 12C, and 10C chain length (Fig. 5).
A variety of desaturases in combination with limited chain-shortening or chain-elongation account for the diversity of double bond isomerism observed among moth sex pheromone compounds.
These pheromone compounds are biosynthesized from saturated fatty-acid precursors along pathways involving a few discrete enzymatic reactions including the introduction of double bonds by specific desaturases, limited chain-shortening reactions and the formation of an oxygenated functional group (e.g., [ 6- 9]).
