Melting behavior of poly(trimethylene terephthalate)

Chung, Wei-Tsung; Yeh, Wei-Jun; Hong, Po‐Da

doi:10.1002/app.10206

Cited by 101 publications

(86 citation statements)

References 28 publications

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“…Peak III disappears altogether when the crystallization temperature is greater than ca. 194 • C. This triple-melting phenomenon has previously been reported [5]. The occurrence of peak I has been attributed to recrystallization during the re-heating process and peaks II and III to the melting of the primary crystallites of two populations of the lamellar stacks [5].…”

Section: Crystal Modification and Crystallinity Of Pttsupporting

confidence: 64%

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Isothermal melt-crystallization and melting behavior for three linear aromatic polyesters

et al. 2004

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Isothermal crystallization and subsequent melting behavior for three different types of linear aromatic polyester, namely poly(ethylene terephthalate) (PET), poly(trimethylene terephthalate) (PTT), and poly(butylene terephthalate) (PBT), were investigated (with an emphasis on PTT in comparison with PET and PBT). These polyesters were different in the number of methylene groups (i.e. 2, 3, and 4 for PET, PTT, and PBT, respectively). Isothermal crystallization studies were carried out in a differential scanning calorimeter (DSC) over the crystallization temperature range of 182-208• C. The wide-angle X-ray diffraction (WAXD) technique was used to obtain information about crystal modification and apparent degree of crystallinity. The kinetics of the crystallization process was assessed by a direct fitting of the experimental data to the Avrami, Tobin, and Malkin macrokinetic models. It was found that the crystallization rates of these polyesters were in the following order: PBT > PTT > PET, and the melting of these polyesters exhibited multiple-melting phenomenon. Lastly, the equilibrium melting temperature for these polyesters was estimated based on the linear and non-linear Hoffman-Weeks (LHW and NLHW) extrapolative methods.

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Section: Crystal Modification and Crystallinity Of Pttsupporting

confidence: 64%

“…Hence, PTT recrystallization during subsequent heating process. Based on wide-angle X-ray diffraction (WAXD) results, it was suggested that the crystal modification of PTT did not change with crystallization temperature, at least within the temperature range studied [5].…”

Section: Introductionmentioning

confidence: 99%

Isothermal melt-crystallization and melting behavior for three linear aromatic polyesters

et al. 2004

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“…[6][7][8][9] According to Figure 8, both neat components, in particular PEN, reveal a multiple melting behavior, detected from the appearance of a small shoulder on the main peak assigned to the partial melting of crystallites with different thermodynamic stability. [21,22] Blends of PTT/PEN 92/8 processed at different mixing conditions were investigated in the same manner. NMR measurements have shown that with increasing processing temperature and time the transesterification is more pronounced.…”

Section: Ptt/penmentioning

confidence: 99%

On the Interrelationship of Transreactions with Thermal Properties and Dynamic Mechanical Analysis of PTT/PEN Blends

Jafari

Khonakdar

Asadinezhad

et al. 2009

Macro Chemistry & Physics

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An attempt was made to explore the effects of interchange reactions on the crystallization, melting, and dynamic mechanical behavior of binary blends based on poly(trimethylene terephthalate) (PTT)/poly(ethylene 2,6‐naphthalate) (PEN). 1H NMR spectroscopy is used to verify the occurrence of interchange reactions at the interface, which are increased upon an increase in the melt processing time and temperature. The crystallinity of PTT was reduced while that of PEN was increased on blending. In addition, the crystallization temperatures of both phases showed depression. A single composition‐dependent glass transition temperature (Tg) was detected in the second and subsequent heating thermograms of the blends, which is indicative of miscibility. The cold crystallization of the PTT phase was observed to increase while that of PEN was suppressed on blending. Each phase crystallized individually and a melting point depression was evident, which suggests a certain level of miscibility. Dynamic mechanical thermal analysis corroborated differential scanning calorimetry results. A constructive synergism was observed in the glassy state storage moduli of the blends, which is suggestive of a reduced specific volume of the system because of enhanced interactions and crystallinity.magnified image

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“…7 The equilibrium melting temperature of PTT is about 525 K, and the equilibrium enthalpy of fusion is 28.8 kJ/mol. 11 The isothermal crystallization kinetics of PTT has also investigated by Avrami theory and the crystallite morphology from melt and cold-crystallization exhibited typical negative spherulite and sheaf-like crystallite. 12 Structure development in PTT fibers during drawing has been studied by two groups.…”

Section: 3mentioning

confidence: 99%

Structural Characterization of Drawn and Annealed Poly(trimethylene terephthalate) Fibers

Ohtaki

Kameda

Asakura

et al. 2005

Polym J

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ABSTRACT:The changes in the structures of the glycol segment of poly(trimethylene terephthalate) (PTT) monofilaments caused by drawing and annealing were analyzed by 13 C solid-state NMR relaxation, wide-angle X-ray diffraction (WAXD), IR spectroscopy, DMA, and DSC measurements. The 13 C solid-state NMR relaxation and WAXD studies indicated that the drawn PTT consists of oriented crystalline, amorphous, and intermediate phases. The IR spectra indicated that three methylene bonds of PTT in the crystalline and amorphous regions adopt gauche-gauche and trans-trans conformations, respectively. The intermediate region consists of aggregates of molecular chains with a gauche conformation. On the other hand, as-spun and annealed PTT fibers consist of amorphous and intermediate regions. Although the proportion of intermediate to amorphous regions was unchanged on annealing, the molecular mobility was changed, i.e., the molecular mobility of the intermediate region decreased with increasing annealing time. The DMA and DSC measurements showed that the glass transition temperature (T g ) of PTT fiber increased by 20 C on annealing for 144 h, whereas drawing induced a more significant increase in the T g . The T g of DR ¼ 3 sample was 50 C higher than that of as-spun fiber, because of the existence of orientational crystallization in the drawn PTT.

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Melting behavior of poly(trimethylene terephthalate)

Cited by 101 publications

References 28 publications

Isothermal melt-crystallization and melting behavior for three linear aromatic polyesters

Isothermal melt-crystallization and melting behavior for three linear aromatic polyesters

On the Interrelationship of Transreactions with Thermal Properties and Dynamic Mechanical Analysis of PTT/PEN Blends

Structural Characterization of Drawn and Annealed Poly(trimethylene terephthalate) Fibers

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