Sequence distribution, crystallization and melting behavior of poly(ethylene terephthalate-co-trimethylene terephthalate) copolyesters

Ko, Chi-Yun; Chen, Ming; Wang, Hui-Chen; Tseng, I-Min

doi:10.1016/j.polymer.2005.01.107

Cited by 29 publications

(63 citation statements)

References 53 publications

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“…The WAXD profile is the same reported in literature for the PET/PTT 50/50 copolymer synthesized by polycondesation reaction and characterized by a randomness parameter of about 1 [17]. As a function of the processing time, a growth of the two main peaks were observed for the C1, C2 and C5 samples.…”

Section: Resultssupporting

confidence: 67%

“…By controlling the extent of the interchange reactions, tailored block and random copolyesters can be formed with desirable properties. Several examples of transesterification reactions in polyester blends have been reported in literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The melt mixing time played an important role in the evolution of the interchange reactions, determining the production of copolymers with block or random characteristics [16]. Ko et al [17] synthesized a series of poly(ethylene terephthalate-co-trimethylene terephthalate) copolyesters in a random sequence; the copolymer with equal amount of monomers displayed a X-ray pattern different from those of the PET and PTT homopolymers, thus indicating a new crystal form.…”

Section: Introductionmentioning

confidence: 99%

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Structural investigation of Poly(ethylene terephthalate)/Poly(trimethylene terephthalate) transesterificated blends

Canetti

Castellano

2012

J Polym Res

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Wide-Angle X-ray Diffraction (WAXD) and Small-Angle X-ray Scattering analyses were carried out to evaluate the evolution of the crystalline and supermolecular structure of poly(ethylene terephthalate) (PET) blended with poly(trimethylene terephthalate) (PTT). The conditions adopted in preparing the PET/PTT 50/50 blend induce transesterification between the polyesters; these reactions produce a new molecular characteristics based on PET/PTT copolymer that exhibits its own WAXD profile. The PET/ PTT 50/50 copolymers prepared by melt mixing of the homopolymers for increasing times evidence spherulitic morphology and an evolution of the crystalline structure in terms of crystallinity and crystal dimensions. The periodicity of the transesterificated samples is intermediate between the long periods observed for pure PET and pure PTT. For the PET/PTT 50/50 copolymers the value of periodicity and lamellar thickness increase with the increasing of the processing time.

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Section: Resultssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural investigation of Poly(ethylene terephthalate)/Poly(trimethylene terephthalate) transesterificated blends

Canetti

Castellano

2012

J Polym Res

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“…The agreement of composition among these three methods is good in this study, as shown in Table 2. The randomness B of the copolymer [34,[45][46][47][48][49] is given by B = P(BSM)/(2P BS ·P MS ). Copolyesters synthesized by polycondensation have usually been considered to have a random distribution.…”

Section: Results and Discussion 31 Molecular Weights And Distributionmentioning

confidence: 99%

“…The reactivities of BD and MPD with SA can be assumed to not differ by much. The average number sequence lengths [33,45,[48][49][50] of BS and MS units are L nBS = 2P BS /P(BSM) and L nMS = 2P MS /P(BSM), respectively. In the case of PBMPSu 50/50, both values were 2.0.…”

Section: Results and Discussion 31 Molecular Weights And Distributionmentioning

confidence: 99%

Synthesis and characterization of novel poly(butylene succinate-co-2-methyl-1,3-propylene succinate)s

Chen¹,

Yang²,

Chen

et al. 2011

Express Polym. Lett.

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Abstract. Poly(butylene succinate) (PBSu), poly(2-methyl-1,3-propylene succinate) (PMPSu), and PBSu-rich copolyesters were synthesized using an effective catalyst, titanium tetraisopropoxide. Measurements of intrinsic viscosity (1.20-1.28 dl/g) and gel permeation chromatography demonstrated the success of the preparation of polyesters with high molecular weights. The compositions of the copolyesters were determined in three approaches from 1 H and 13 C NMR (nuclear magnetic resonance) analyses, and good agreement between the results was obtained. The distributions of the comonomers were found to be random from the spectra of carbonyl carbon. Their thermal properties were elucidated using a differential scanning calorimeter and a thermogravimetric analyzer. No marked difference exists among the thermal stabilities of these polyesters. However, the window between the glass transition and the melting temperatures becomes narrower with the increase in the concentration of 2-methyl-1,3-propylene succinate in the copolymers. Additionally, the cold crystallization ability decreases considerably. Finally, PMPSu is an amorphous homopolymer. Wide-angle X-ray diffractograms of isothermally crystallized copolyesters also follow the same trend.

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Synthesis and characterization of poly(ethylene succinate) and its copolyesters containing minor amounts of butylene succinate

Chen

et al. 2008

J of Applied Polymer Sci

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Poly(ethylene succinate) (PES) and its copolyesters that contain 7, 10, or 48 mol % butylene succinate (BS) were synthesized through a direct polycondensation reaction with titanium tetraisopropoxide as the catalyst. Measurements of intrinsic viscosity (1.08-1.27 dL/g) proved the success of the preparation of polyesters with high molecular weights. The compositions and the sequence distributions of the copolyesters were determined from 1 H and 13 C NMR spectra. The distributions of ethylene succinate and BS units were found to be random. Their thermal properties were elucidated using a differential scanning calorimeter (DSC) and a thermogravimetric analyzer. No significant difference exists among the thermal stabilities of these polyesters. All of the copolymers exhibit a single glass transition temperature. Wide-angle X-ray diffractograms (WAXD) were obtained from polyesters that were crystallized isothermally. The DSC thermograms and WAXD patterns indicate that the incorporation of BS units into PES significantly inhibits the crystallization behavior of PES. The heat of fusion of ideal PES crystals is 163 J/g, as determined by the depression of the melting point of PES crystals in acetophenone.

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Sequence distribution, crystallization and melting behavior of poly(ethylene terephthalate-co-trimethylene terephthalate) copolyesters

Cited by 29 publications

References 53 publications

Structural investigation of Poly(ethylene terephthalate)/Poly(trimethylene terephthalate) transesterificated blends

Structural investigation of Poly(ethylene terephthalate)/Poly(trimethylene terephthalate) transesterificated blends

Synthesis and characterization of novel poly(butylene succinate-co-2-methyl-1,3-propylene succinate)s

Synthesis and characterization of poly(ethylene succinate) and its copolyesters containing minor amounts of butylene succinate

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