| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 97 === Three types of functional groups of the chain-extenders were used in this study, including poly(styrene-co-maleic anhydride) with Mw.2000 (SMA1000) and Mw.3800 (SMA3000), commercialized epoxy groups compounds (TOAGOSEI: XG-4030,UG-4070, BASF: adr-4368-cs) and diimide groups compound (Rhein Chemie: Stabaxol P). The intrinsic viscosity and its carboxyl group content of the PET/chain-extenders blended mixtures were measured to determine the molecular weight during the blended process in brabender at high temperature. The intrinsic viscosity of pristine poly(ethylene terephthalate) (PET) was 0.6528 (dL/g) before the blending, and then down to 0.4662 (dL/g) after 5 minutes of the blended. Among those chain-extenders used, the hydrolysis rate of the PET could be effectively inhibited by SMA3000 (0.5286 dL/g) and UG-4070 (0.5100 dL/g) when 0.5wt% of the chain-extenders was added in the blend. However, the optimal value of the addition for SMA3000 was 2.0wt% which is higher than the theoretical value of the addition (1.93wt%). In addition, the optimal addition value of the UG-4070 was at 4.63wt% which is higher than the theoretical value of the addition (4.39wt%). Furthermore, the reaction mechanism was demonstrated by measuring the carboxyl group content of the blended mixtures. The carboxyl group content of the PET/SMA3000 was increased with the addition of SMA3000. However, the result of the PET/UG-4070 was the opposite with that of PET/SMA3000. The simultaneously added SMA3000 and UG-4070 into PET was better inhibited hydrolysis rate of the PET than that of PET/SMA3000 or PET/UG-4070 added alone.
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