vac], were obtained by the calculations of these two methods (LCAO and PM3) on the short segments of PMVC chains.
While the Langmuir-Blodnett rown films of PMVC could adopt a geometric structure with all dipoles pointing to one direction and all the methyl groups sitting on one side of molecule, as shown schematically in Fig.
The alternating trans-gauche conformation is also possible for the polymer structure in ordered Langmuir-Blodgett films of PMVC just as is the case for P(VDF-TrFE) in the paraelectric phase (3), (4).
This agreement between the experimental electronic structure and the calculated model DOSs suggests (hat Langmuir-BJodgett PMVC films adopt the all-trans conformation with all dipoles aligned.
In spite of the differences, both the ab initio methods and the semiempirical PM3 calculations suggest that the all-trans conformation is the only structural phase of PMVC films at room temperature and below.
6] assessed the burden of trauma secondary to road traffic collisions (RTCs) in a regional trauma centre in KZN over a 10-week period, their data highlighting both a significant burden of trauma secondary to RTCs and a relatively high proportion of PMVCs.
4%), blunt force trauma secondary to PMVCs in 285 (7.
They demonstrated a high burden of trauma as a result of RTCs, with PMVCs accounting for 41%.
Studies are needed to identify factors that increase or decrease the risk of RTCs, particularly PMVCs, in order to successfully implement effective interventions and legislation.
It further highlights the burden of PMVCs as a proportion of all RTCs.