Crystallization in blends of poly(ethylene terephthalate) and poly(butylene terephthalate)

Yong, Yu; Choi, Kyung‐Ju

doi:10.1002/pen.11648

Cited by 53 publications

(33 citation statements)

References 8 publications

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“…18 The occurrence of transreactions in the blend strongly depends on the mutual af®nity of its components and on blending conditions. These include temperature, 24,28 duration of mixing, 24,28 preparation method, viscosity, and the presence of catalysts and inhibitors. 21,32 Sometimes con¯icting conclusions concerning blending properties have been drawn from a given system just because blends were prepared in different ways.…”

Section: ±5mentioning

confidence: 99%

A review on the potential biodegradability of poly(ethylene terephthalate)

1999

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Section: ±5mentioning

confidence: 99%

A review on the potential biodegradability of poly(ethylene terephthalate)

1999

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“…Blending of two or more polymers has emerged as an established route to design tailor made polymeric materials with desired attributes for various high performance applications [1][2][3][4] . However, most of the polymer pairs are inherently immiscible that results in incompatibility with subsequent phase separation in the blend matrix.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, Thermal and Morphological Behaviours of Polybutylene Terephthalate/Polycarbonate Blend Nanocomposites

Rajakumar¹,

Nanthini²

2013

ILCPA

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Polybutylene Terephthalate (PBT) / Polycarbonate (PC) nanocomposite blend was fabricated using melt blending technique in a twin extruder. The blend composition was optimized at PBT-PC weight ratio of 80-20. The effect of incorporation of various organically modified Montmorillonite (OMMT) and naturally occurring sodium Montmorillonite (MMT) on the mechanical, thermal and morphological properties of the nanocomposites blend has been investigated. It was observed that the Izod impact strength, tensile strength and flexural strength demonstrated a significant increase with the increase in clay loading from 1-7 weight % due to homogeneous dispersion of clay within the blend matrix. Thermo gravimetric analysis (TGA) revealed an increase in thermal stability of the blend with the incorporation of nanoclay. There is also decrease in the melting temperature (Tm) and crystallisation temperature (Tc) as observed from DSC thermograms. DMA add the evidence for TGA, DSC and mechanical results. PBT -PC blend with clay exhibited featureless XRD indicative of exfoliated structure. TEM micrographs also confirm the same that the clay has exfoliated into individual layers.

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“…[21][22][23][24][25][26][27] The three -(CH 2 )-units of the chemical structure account for the chain flexibility of PTT; hence, at the same undercooling, PTT displays a greater crystallization rate than does PET. [26,27] Whereas blends of PET and PBT have been quite widely considered in the past, [28][29][30][31] blends involving PTT have been explored only recently. [32][33][34][35][36][37] Physical intimate miscibility on a fine segmental scale was found in the quenched state of binary PBT/PTT and PET/PTT and ternary PET/PBT/PTT blends, prepared under the conditions of no chemical transesterification, whereas during crystallization, the components form their own crystals; unit cells of the crystalline regions remain individually different and co-exist in common spherulites.…”

Section: Introductionmentioning

confidence: 99%

Reactive Blending of Aromatic Polyesters: Thermal Behaviour of Co‐precipitated Mixtures PTT/PET

Castellano

Turturro

Valenti

et al. 2006

Macro Chemistry & Physics

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Summary: Due to its unique combination of properties, PTT is a promising material for textile fibre and engineering thermoplastic applications, both as neat polymer and in formulated products. To bring down the cost yet keeping some of its advantageous properties it seems interesting to apply PTT in blends and particularly with PET. We consider here the effect of composition and reaction time on co‐precipitated mixtures PTT/PET, in terms of melting and crystallization behaviour, solution properties and morphology. Blends of various compositions were prepared from mixed solutions, kept in the DSC at 280 °C for different times (0–120 min) and analysed during a successive cooling‐heating cycle. A single Tg was detected for each composition, indicative of miscibility in the glassy state. Melting temperatures, at fixed composition, decrease with increasing treatment time. Mixtures rich in one component show a single Tm, whereas two distinct peaks were observed for the 50/50 blend; on increasing the treatment time some transesterification takes place, evidenced by the melting peak broadening and merging together. The overall crystallinity developed when transesterification plays a role strongly depends on composition: it is inhibited for the 50/50 mixture on cooling, though it can be induced to some extent by reheating or holding during cooling, whereas in one component‐rich blends the main effect is a reduction of the crystallization temperature. Isothermal crystallizations were also carried out as a function of the composition and of the residence time in the molten state; crystallization rate decreases with increasing holding time in the melt. Morphology of PTT and PTT‐rich mixtures under the adopted crystallization conditions exhibits typical banded spherulites, whose growth rate and band spacing vary with melt holding time; moreover, less regular concentric circles develop on increasing residence time at 280 °C.Spherulitic texture developed at 198 °C after 60 min storage at 280 °C by a PTT/PET 90/10 mixture.magnified imageSpherulitic texture developed at 198 °C after 60 min storage at 280 °C by a PTT/PET 90/10 mixture.

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Crystallization in blends of poly(ethylene terephthalate) and poly(butylene terephthalate)

Cited by 53 publications

References 8 publications

A review on the potential biodegradability of poly(ethylene terephthalate)

A review on the potential biodegradability of poly(ethylene terephthalate)

Mechanical, Thermal and Morphological Behaviours of Polybutylene Terephthalate/Polycarbonate Blend Nanocomposites

Reactive Blending of Aromatic Polyesters: Thermal Behaviour of Co‐precipitated Mixtures PTT/PET

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