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A letter to the editor is presented in response to the article about the crystallization behavior of poly(trimethylene terephthalate) (PTT) and stresses the influence of multiwalled carbon nanotubes on the crystallization of PTT.

A letter to the editor about synthesis and crystallization behavior of polytrimethylene terephthalate polyethylene glycol segmented copolyesters is presented.

The article focuses on synthesizing copolyesters based on different molar ratios of polytrimethylene terephthalate to polytrimethylene isophthalate. Thermal properties and crystallization behavior of polytrimethylene terephthalate copolymers containing isophthalic units are explored. The effect of inclusion of isophthalate unit in the chain replacing the terephthalate unit is also presented.

Investigates the primary and secondary crystallization kinetics analysis of poly(trimethylene terephthalate) (PTT). Rate of crystallization of PTT; Description of the time dependence of crystallization degree as a linear combination of two Avrami expressions; Division of the crystallization of polymers into two consecutive processes.

Discusses the composition dependence of thermal properties of poly(trimethylene-co-ethylene terephthalate) (PTT). Characteristics of PTT; Applicability and processing condition of PTT; Thermal properties of poly(trimethylene-co-ethylene terephthalate) (PTET).