In Chapter 1, solid state polymerization (SSP) was carried on the commercial PBT from melt polymerization. The carboxyl end group of PBT was decreased as the molecular weight was increased during SSP. The change of carboxyl end group and mechanical properties of them were measured under the pressure...
In Chapter 1, solid state polymerization (SSP) was carried on the commercial PBT from melt polymerization. The carboxyl end group of PBT was decreased as the molecular weight was increased during SSP. The change of carboxyl end group and mechanical properties of them were measured under the pressure cooker test (PCT, @121℃/RH 100%) as the function of aging time. The carboxyl end groups were increased with the PCT aging time and the increasing rate was proportion to the number of the initial carboxyl end group. As less the initial carboxyl end group, the tensile strength, flexural strength, and impact strength were maintained for longer time. This study showed that the anti-hydrolysis of PBT can be improved with SSP due to reduced carboxyl end group. In Chapter 2, the PBT samples were prepared through extrusion and injection with 0.2 ~ 0.8wt% of the polymeric and monomeric carbodiimide respectively. Then they were measured for the carboxyl end group, mechanical properties, and rheological properties. To evaluate the effect of anti-hydrolysis due to the type and content of carbodiimide, PCT and USCAR CLASS III test were achieved. The initial carboxyl end group was decreased with the level of carbodiimide of both types. The carboxyl end group was increased more slowly as less the initial carboxyl end group. And mechanical properties such as tensile strength, flexural strength, and impact strength also decreased more slowly on PCT and USCAR CLASS III as the carbodiimide contents were increased. For glass fiber reinforced PBT, PBT with carbodiimide 0.8wt% showed better retention ratio for mechanical properties than PBT without carbodiimide. In Chapter 3, the PBT samples, which contain PEL 7wt% and PTW 2, 4, 6wt % respectively, were prepare by in-situ react extrusion to enhance the anti-hydrolysis of PBT. The initial carboxy end group was decreased as PEL and PET contents were increased. For evaluation under high temperature and high humidity, the pressure cooker test (PCT) and USCAR CLASS III test were achived. The carboxyl end group was increased more slowly as less the initial carboxyl end group. And mechanical properties such as tensile strength, flexural strength, and impact strength also decreased more slowly on PCT and USCAR CLASS III as the PEL and PTW contents were increased.
In Chapter 1, solid state polymerization (SSP) was carried on the commercial PBT from melt polymerization. The carboxyl end group of PBT was decreased as the molecular weight was increased during SSP. The change of carboxyl end group and mechanical properties of them were measured under the pressure cooker test (PCT, @121℃/RH 100%) as the function of aging time. The carboxyl end groups were increased with the PCT aging time and the increasing rate was proportion to the number of the initial carboxyl end group. As less the initial carboxyl end group, the tensile strength, flexural strength, and impact strength were maintained for longer time. This study showed that the anti-hydrolysis of PBT can be improved with SSP due to reduced carboxyl end group. In Chapter 2, the PBT samples were prepared through extrusion and injection with 0.2 ~ 0.8wt% of the polymeric and monomeric carbodiimide respectively. Then they were measured for the carboxyl end group, mechanical properties, and rheological properties. To evaluate the effect of anti-hydrolysis due to the type and content of carbodiimide, PCT and USCAR CLASS III test were achieved. The initial carboxyl end group was decreased with the level of carbodiimide of both types. The carboxyl end group was increased more slowly as less the initial carboxyl end group. And mechanical properties such as tensile strength, flexural strength, and impact strength also decreased more slowly on PCT and USCAR CLASS III as the carbodiimide contents were increased. For glass fiber reinforced PBT, PBT with carbodiimide 0.8wt% showed better retention ratio for mechanical properties than PBT without carbodiimide. In Chapter 3, the PBT samples, which contain PEL 7wt% and PTW 2, 4, 6wt % respectively, were prepare by in-situ react extrusion to enhance the anti-hydrolysis of PBT. The initial carboxy end group was decreased as PEL and PET contents were increased. For evaluation under high temperature and high humidity, the pressure cooker test (PCT) and USCAR CLASS III test were achived. The carboxyl end group was increased more slowly as less the initial carboxyl end group. And mechanical properties such as tensile strength, flexural strength, and impact strength also decreased more slowly on PCT and USCAR CLASS III as the PEL and PTW contents were increased.
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