Phase structure and sorption/de-sorption in poly(trimethylene terephthalate) (PTT)

Grȩbowicz, Janusz; French, R.N.

doi:10.1016/s0040-6031(02)00525-7

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…Identical behaviour has also been observed by other investigators, and it was characterized as the mid‐range transition ( T mid ) since it takes place between the glass transition and the melting temperature 19. This transition is much higher than T g , indicating that the rigidity of the phase undergoing this transition is higher than that of the corresponding amorphous phase.…”

Section: Resultssupporting

confidence: 70%

Study of the thermal behaviour of alipharomatic polyesters around the glass–rubber transition region by thermomechanical analysis: the mobile and rigid amorphous fraction

Karayannidis

Kirikou

Roupakias

et al. 2006

Polymer International

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The objective of this work was the study using thermomechanical analysis (TMA) of a peculiar behaviour, which was observed some years ago, around the glass–rubber transition region in some thermoplastic alipharomatic polyesters. For this purpose a series of nine alipharomatic polyesters was prepared by the two‐stage melt polycondensation method in a glass batch reactor and subjected to TMA in both penetration and expansion mode. Differential scanning calorimetry (DSC) was additionally used and the results are discussed focusing mainly on the first derivative curve of TMA thermograms in the penetration mode. From this curve, which shows two distinct peaks, the first peak could be attributed to the glass transition temperature (Tg) of the mobile amorphous fraction, since the value coincides with that obtained from DSC and is due to the abrupt shrinkage of the amorphous part of the sample. The second peak (up to 40 °C higher than Tg) is due most probably to the softening of the rigid amorphous fraction and the passage of the polymeric sample from the glass region to the cold crystallization region. When the sample is more crystalline than amorphous then the first peak is smaller or is completely absent. Copyright © 2006 Society of Chemical Industry

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Section: Resultssupporting

confidence: 70%

Study of the thermal behaviour of alipharomatic polyesters around the glass–rubber transition region by thermomechanical analysis: the mobile and rigid amorphous fraction

Karayannidis

Kirikou

Roupakias

et al. 2006

Polymer International

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“…This is attributed to the partially crystalline nature of PTT and to a possible additional PTT crystallization in the presence of chloroform. Solvent‐induced crystallization takes place in PTT in the presence of methylene chloride 21. The crystalline phase should hinder the solvent penetration and dissolution of phenoxy and lead to a smaller hole content.…”

Section: Resultsmentioning

confidence: 99%

“…Its chemical structure in cludes a lateral hydroxyl group in each repeating unit, which is able to establish specific interactions with proton‐acceptor polymers and is also able to react with condensation polymers such as polyalkylene terephthalates, polyamides, or PC. Miscible phenoxy blends include those with PBT,13–18 poly(ϵ‐caprolactone),19 poly(methyl methacrylate),20 Hytrel,21 and poly(ethylene oxide) 22. Partially miscible blends include those with poly(ethyl methacrylate) 23.…”

Section: Introductionmentioning

confidence: 99%

Structure and mechanical properties of poly(trimethylene terephthalate)/poly(hydroxy ether of bisphenol A) blends

González¹,

Eguiazábal²,

Nazábal³

2006

J of Applied Polymer Sci

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Compatible poly(trimethylene terephthalate) (PTT)/poly(hydroxy ether of bisphenol A) (Phenoxy) blends were obtained by direct injection molding throughout the composition range. Two amorphous phases with minor amounts of the other component were found in the blends. Reactions occurred in PTT-rich blends. By comparing the miscibility level of these blends with that of other blends based on polyalkylene terephthalates, it is proposed that a miscibility limit delimited by a 3/1 methylenecarbonyl ratio in the polyalkylene terephthalate exits in these blends. The synergism in the Young's modulus of the blends is discussed as a consequence of the changes in the crystallinity of PTT, the specific volume and the orientation produced by blending. Ductility is approximately proportional to blend composition, indicating compatibility, and is attributed to the combined effects of a small particle size and a good adhesion level, the latter being a consequence of the partially miscible nature of the blends.

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“…The enthalpy of melting was measured by a METTLER TO-LEDO DSC822e differential scanning calorimeter (DSC). The bulk crystallinity ( c ) was calculated by taking 146 J/g as the enthalpy of melting of 100% crystalline PTT, 3,7 i.e., c ϭ ⌬h f /146.…”

Section: Bulk Crystallinity Measurementsmentioning

confidence: 99%

Lamellar morphology of poly(trimethylene terephthalate)/poly(ether imide) blends studied via small‐angle X‐ray scattering

Chiu

Huang

2005

J of Applied Polymer Sci

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ABSTRACT:The lamellar morphology of a melt-miscible blend consisting of poly(trimethylene terephthalate) (PTT) and poly(ether imide) (PEI) prepared by solution precipitation has been investigated by means of optical polarized microscopy (POM) and small angle X-ray scattering (SAXS). From the observation under POM, it was suggested that PEI was predominantly segregated into the interlamellar and/or interfibrillar regions upon PTT crystallization since the PTT spherulitic morphologies of blends were volume-filling. From results of SAXS data analysis, a larger amorphous layer thickness was identified in the blends, showing that some PEI was incorporated inside the interlamellar regions after crystallization. Despite the swelling of the amorphous layer, the amorphous layer thickness was relatively independent of the blend composition. It was concluded that amorphous PEI was located in the interlamellar regions of PTT as the weight fraction of PEI (w PEI ) [Յ] 0.1, while amorphous PEI was predominantly segregated into the interfibrillar regions of PTT as w PEI Ͼ 0.1, and the extent of interfibrillar segregation increased with increasing w PEI .

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Phase structure and sorption/de-sorption in poly(trimethylene terephthalate) (PTT)

Cited by 9 publications

References 6 publications

Study of the thermal behaviour of alipharomatic polyesters around the glass–rubber transition region by thermomechanical analysis: the mobile and rigid amorphous fraction

Study of the thermal behaviour of alipharomatic polyesters around the glass–rubber transition region by thermomechanical analysis: the mobile and rigid amorphous fraction

Structure and mechanical properties of poly(trimethylene terephthalate)/poly(hydroxy ether of bisphenol A) blends

Lamellar morphology of poly(trimethylene terephthalate)/poly(ether imide) blends studied via small‐angle X‐ray scattering

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