Poly(ethylene-co-ethyleneoxyethylene terephthalate)s: synthesis and non-isothermal crystallization behavior

Synthesis and Non-Isothermal Crystallization Characteristics of Poly[(ethylene)-co-(trimethylene terephthalate)]s

“…The T m 8's measured in the copolymers follow the Flory equation [4,5] as illustrated in Figure 4. This result supports positively that the synthesized polymers are a random copolymer, which has been stated earlier from the variation of the single T g with composition.…”

“…[1][2][3][4][5] However, PET polymer still has some undesirable properties that could be improved: poor dyeability, pilling, low moisture regain, generation of static charges, poor adhesion to metals, and poor processability due to the high melting temperature. [1 -5] In comparison to PET, poly(trimethylene terephthalate) (PTMT) gained less attention previously because of the relatively high price of trimethylene glycol in the polymerization.…”

“…The n values are comparable with those reported for PET homopolymer and its copolymers containing either ethylene isophthalate or oxydiethylene terephthalate unit which proceed crystallization through three-dimensional spherulitic growth with a predominant heterogeneous nucleation. [4,5,33] And, the polymers made in this study contain a small amount of catalyst residue which was used in the bulk polymerization. Such catalyst residue may play as nuclei, so that the crystallization in all the used polymers might be initiated via heterogeneous nucleation mechanism.…”

“…1 6 10 -2 Torr as described elsewhere. [4,5] In the same manner, a series of copolymers in other compositions were prepared by varying the feed ratio of EG and TMG with respect to the DMT. In addition, PET and PTMT homopolymers were synthesized.…”

“…T m 8 is 280.0 8C for the PET polymer and 238.0 8C for the PTMT polymer, which are in good agreement with those (275.4-278 8C for PET [4,5,30] and 237 8C for PTMT [31,32] ) reported previously. The T m 8 of PET polymer is depressed with increasing the content of TMG added as a minor component, which is reflected from the T m depression with the TMG content in the measurement (see Figure 4).…”