POMG

AcronymDefinition
POMGPeace of Mind Guaranteed
POMGPacific Orthopedic Medical Group, Inc.
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(13), the initial fast reaction is due to reaction between primary hydroxyls of POMG and MA, while the slower reaction is between the secondary hydroxyls and MA.
Figure 3 shows FTIR spectrum of POMG and the UP resin prepared.
This phenomenon probably attributed to the inductive effect and steric factors resulting from the reaction product of primary hydroxyls of POMG and MA.
Ratio Optimum time (h) POMG:MA Catalyst (%) 70 80 90 100 [degrees]C [degrees]C [degrees]C [degrees]C 1: 2.2 1.0 7 6 6 6 1.5 7 6 5 5 2.0 6 6 4 4 1.0 6 5 5 5 1: 2.0 1.5 6 5 4 3 2.0 5 5 3 3 1.0 5 4 4 3 1: 1.8 1.5 5 4 4 3 2.0 5 3 3 3 1.0 5 4 2 2 1: 1.6 1.5 5 3 2 2 2.0 4 2 2 2 Sorption Studies on UP Resins Cured with Styrene
POMG:MA Hexane Toluene Ethanol Methanol 1: 2.2 0.16 0.48 0.65 0.77 1: 2.0 0.17 0.47 0.60 0.85 1: 1.8 0.18 0.45 0.58 0.68 1: 1.6 0.22 0.44 0.51 0.61 To investigate the mechanism of sorption, the values of [Q.sub.t] and [Q.sub.[varies]] were substituted to the equation (18):
Hexiine Toluene Ethanol POMG:MA n K (x n K (x n K (x [10.sup.-3]) [10.sup.-3]) [10.sup.-3]) 1: 2.2 0:51 1.96 1.51 1.75 0.42 1.76 1: 2.0 0:63 2.34 1.54 1.74 0.41 1.72 1: 1.8 0.62 2.28 1.57 1.83 0.41 1.72 1: 1.6 0.70 2.45 0.54 1.61 0.42 1.71 Methanol POMG:MA n K (x [10.sup.-3]) 1: 2.2 0.41 1.56 1: 2.0 0.43 1.69 1: 1.8 0.41 1.58 1: 1.6 0.39 1.48 From the swelling data, diffusion coefficient (D), which is a measure of the ability of a solvent molecules to move through a polymer and sorption coefficient (S), which measure the extent of the sorption, was calculated from the following equations (21):
Hexane Toluene POMG: S D x [10.sup.-5] P x [10.sup.-6] S D x [10.sup.-5] MA ([cm.sup.2]/s) ([cm.sup.2]/s) ([cm.sup.2]/s) 1: 2.2 0.14 3.61 5.05 0.44 12.18 1: 2.0 0.15 3.49 5.24 0.43 12.92 1: 1.8 0.16 3.59 5.75 0.41 13.16 1: 1.6 0.19 4.81 9.14 0.41 26.55 POMG: P x [10.sup.-6] MA ([cm.sup.2]/s) 1: 2.2 53.59 1: 2.0 55.56 1: 1.8 53.96 1: 1.6 108.86 TABLE 7.
POMG:MA Solubility parameter [(cal/[cm.sup.3]).sup.1/2] 1: 2.2 9.9 1: 2.0 9.7 1: 1.8 9.6 1: 1.6 9.3 From the solubility parameter data, the polymer--solvent interaction parameter (X) is calculated using the equation (28):
POMG:MA Hexane Toluene Ethanol Methanol 1: 2.2 1.84 0.52 1.11 1.79 1: 2.0 1.61 0.46 1.23 1.92 1: 1.8 1.51 0.43 1.29 1.99 1: 1.6 1.22 0.37 1.48 2.19 CONCLUSIONS