In the polycondensation reaction of polyethyleneterephthalate(PET), $Sb_2$$O_3$, can react effectively as a catalyst, if physically transformed. $Sb_2$$O_3$ powder is transformed into liquid solution by dissolving in ethylene glycol(EG). Homogeneous cataly...
In the polycondensation reaction of polyethyleneterephthalate(PET), $Sb_2$$O_3$, can react effectively as a catalyst, if physically transformed. $Sb_2$$O_3$ powder is transformed into liquid solution by dissolving in ethylene glycol(EG). Homogeneous catalyst is made by mixing this liquid solution with glycols having different solubility. The efficient reaction of PET polymerization is expected by using homogeneous catalyst. PET was synthesized using homogeneous catalysts of 4 wt.% $Sb_2$$O_3$ solution dissolved in glycol[EG, 2,2-bis(4-(2-hydroxyethoxy)phenol)propane(BHPP), neopentyl glycol(NPO), and 1,3-propandiol(PD)]. PET using EG-BHPP($Sb_2$$O_3$) catalysts shows the highest I.V. within a reaction time of 120 min. In the p-d analysis, PET using EG-BHPP($Sb_2$$O_3$) catalysts has the fastest propagation rate and slowest degradation rate. EG-BHPP($Sb_2$$O_3$) catalysts are more efficient than EG($Sb_2$$O_3$) catalysts and $Sb_2$$O_3$ powder catalysts.
In the polycondensation reaction of polyethyleneterephthalate(PET), $Sb_2$$O_3$, can react effectively as a catalyst, if physically transformed. $Sb_2$$O_3$ powder is transformed into liquid solution by dissolving in ethylene glycol(EG). Homogeneous catalyst is made by mixing this liquid solution with glycols having different solubility. The efficient reaction of PET polymerization is expected by using homogeneous catalyst. PET was synthesized using homogeneous catalysts of 4 wt.% $Sb_2$$O_3$ solution dissolved in glycol[EG, 2,2-bis(4-(2-hydroxyethoxy)phenol)propane(BHPP), neopentyl glycol(NPO), and 1,3-propandiol(PD)]. PET using EG-BHPP($Sb_2$$O_3$) catalysts shows the highest I.V. within a reaction time of 120 min. In the p-d analysis, PET using EG-BHPP($Sb_2$$O_3$) catalysts has the fastest propagation rate and slowest degradation rate. EG-BHPP($Sb_2$$O_3$) catalysts are more efficient than EG($Sb_2$$O_3$) catalysts and $Sb_2$$O_3$ powder catalysts.
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제안 방법
In this study, an efficient polymerization method was studied by using homogeneous catalysts created by dissolving BHPP, PD, NPG in 4 wt %. Sb2O3 ethylene glycol solution in order to improve reactivity of reaction materials.
Thermal analysis of PET samples was performed to analyze the thermal factors such as Tg, Tc and Tm in the range of 20℃ and 300℃ at the heating and cooling rate of 10℃/min., using differential scanning calorimeter (DSC 2010, TA Instruments).
이론/모형
The solubility parameter was calculated by using the Hoftyzer and Krevelen equation[16]. The solubility parameter components may be predicted from the group contributions, using the following equations;
성능/효과
00 of aliphatic group(-CH2 -). Given these results, it was found that the ratio of = CH- : -CH2 - of each PET sample 나sing Sb2O3 powder, EG-NPG (Sb2O3 4%) and EG-PP(Sb2O3 4%) was a proportion of nearly 1:1, but PET sample using EG-BHPP(Sb2O3 4%) catalyst showed a ratio of 1:1.109. This is most likely due to the presence of ethylene glycol units of BHPP.
8 J1/2/cm3/2, respectively. In terms of the structure of glycol, the values of solubility parameter increased in the order of BHPP < NPG < PD < EG(see Table), and it was noted that the solubility parameter of check BHET oligomer was very similar to that of BHPP. PET using BHPP which has the fastest propagation rate requires the least reaction time of 83 min.
Different homogeneous catalysts dont affect the thermal properties and chemical structure. It can be concluded that EG-BHPP(Sb2O3 4%) catalyst is more efficient than EG(Sb2O3 4%) catalyst and Sb2O3 powder catalyst.
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