Structural, thermal and rheological studies on newly developed polyesters randomly copolymerized with poly (tetramethyle
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1151-SS01-04
Structural, thermal and rheological studies on newly developed polyesters randomly copolymerized with poly (tetramethylene glycol) (PTMG) Osamu Matsumoto1 and Atsushi Hotta1 1 Graduate School of Science and Technology, Keio University, Yokohama, Japan
ABSTRACT Poly (cyclohexanedimethanol cyclohexanedicarboxlic acid) (PCC), a fairly newly synthesized polyester, has been studied. Having a good experience of increasing both thermal stability and service temperature when applied to typical polymers, poly (tetramethylene glycol) (PTMG) was selected as a softening agent that was randomly copolymerized into the PCC chains. Another widely-used polyester, poly (ethylene terephthalate) (PET) was also produced in order to investigate the effect of PTMG, which was compared with the properties of the newly developed random PCC-PTMG copolymers (PCCP). In this study, the crystalline structures, the thermal and the mechanical properties of both PCC and PET containing different ratios of the random segment of PTMG were investigated by differential scanning calorimetery (DSC) and tensile tester. It was found that the crystallization rate of pure PCC was significantly slow, whereas for PCCP, PTMG effectively accelerated the crystallization rate with increasing PTMG, and the sample with 25 wt% of PTMG had the fastest crystallization rate in all PCCP samples. Here, the PTMG acted as an accelerator, simultaneously depressing the movement of PCC molecular chains. The elastic recovery test indicated that the ability of PTMG as a softening agent was highly demonstrated at 20 wt% of PTMG. The results of PCCP were compared with those of PET-PTMG copolymers (PETP) and it was found that there were optimum values of PTMG for the crystallization rate on both samples. Additionally, the results of the elastic recovery test indicated that the softening effects observed in PCCP were more pronounced than those observed in PETP.
INTRODUCTION Polyesters are extensively and widely used polymers due to their well-balanced mechanical properties, decent processability and improved recycling efficiency, principally originating from the structural advances described as the effective combination of polyols and polyprotic acids. The resulting characteristics of the polyester resins lead to the practical applications of the materials ranging from food wrapping to industrial engineering plastics. Polyesters can further exhibit functionality through the control of molecular weight, monomer compounds and the chain structures of monomer to improve the thermal, mechanical and crystallization properties. Poly (ethylene terephthalate) (PET) is the most well-known and widely-used polyester finding substantially wide commercial and consumer applications, when used as films, fibers, and containers. The widespread success of PET in such applications may be highly attributed to its ability of crystallization upon deformation and shear strain applied during processing and recycling.[1-3]
Another polyester, (1, 4-cyclohexylenedimethylene 1, 4-cyclohexanedica
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