Abstract
Summary: P(TTโcoโTI)s with up to 20 molโ% of TI units were synthesized in order to modulate the thermal and mechanical properties of PTT and were characterized by FTโIR, ^1^H NMR, DSC, and DMA analysis. PTI and PTT were also synthesized for the purpose of comparison. The polymerizations proceeded via two steps, i.e., transesterification and polycondensation. Manganese acetate and titanium butoxide were used as catalysts for the transesterification and polycondensation steps, respectively. During the polymerization, the P(TTโcoโTI) copolymers and PTI exhibited similar transesterification rates, whereas PTI showed a slower rate. The polycondensation rate decreased with increasing TI content in P(TTโcoโTI). The synthesis of the polymers was confirmed by FTโIR and ^1^H NMR analysis. DSC and DMA analysis indicated that the P(TTโcoโTI)s are random copolymers, and that their T~cc~ increased and T~m~ decreased as the TI content in the P(TTโcoโTI) increased. The peel strength between the P(TTโcoโTI) films and an aluminum sheet increased as the TI content in the copolymer increased. The meltโquenched films of the PTT and P(TTโcoโTI) copolymers had similar tensile strengths and initial moduli. The dyeing property of the P(TTโcoโTI) films was enhanced by increasing the TI content.
DSC heating thermograms of the meltโquenched PTT, PTI, and P(TTโcoโTI)s.
magnified imageDSC heating thermograms of the meltโquenched PTT, PTI, and P(TTโcoโTI)s.