Morphological study by TEM on uniaxially oriented thin films of PET, PEN and their blends

Yoshioka, Taiyo; Tsuji, Masaki; Kawahara, Yutaka; Kohjiya, Shinzo

doi:10.1016/j.polymer.2003.10.019

Cited by 23 publications

(17 citation statements)

References 36 publications

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“…studied the mechanical properties of short time melt blended copolyesters of PET and PEN and found that the stiffness of a PEN film can be reduced by adding a small amount of PET. Yoshioka et al . noted a changing morphology by varying the composition.…”

Section: Introductionmentioning

confidence: 99%

Tailoring block‐copolyesters by reactive blending of polyethylene terephthalate and polyethylene naphthalate using statistical design of experiments

Röhner

Geyer

Gad'on

et al. 2015

J of Applied Polymer Sci

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Block-copolyesters of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) were synthesized via reactive extrusion. The influence of processing parameters on the material properties on a molecular scale like degree of trans-esterification, block length, and degree of randomness were investigated. The varied process factors were extrusion temperature and rotational speed. The effects of process parameter variation were investigated by 1 H-NMR-spectroscopy. The experimental results show a clear dependence of the molecular properties on the processing conditions. By using statistical experimental design (DoE), it was possible to prepare defined copolyesters from PET and PEN without addition of further chemicals. With a degree of randomness between 0.05 and 0.5, the presence of an actual copolyester was confirmed when appropriate extrusion conditions were applied. The reactive extrusion process was confirmed to be suitable to produce defined block-copolyesters in a predictable and reproducible way. It was possible to produce designed sequence lengths, which could be adjusted within a range of 11-136 repeating units in the case of PET and, in the case of PEN, of 2.5-26. The produced materials can be used as barrier materials or barrier coatings to protect substrates against molecular oxygen and water vapour, e.g., in organic photovoltaic applications or food packaging. The described method is a one-pot alternative method to the previously described chemical recycling pathway.

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Section: Introductionmentioning

confidence: 99%

Tailoring block‐copolyesters by reactive blending of polyethylene terephthalate and polyethylene naphthalate using statistical design of experiments

Röhner

Geyer

Gad'on

et al. 2015

J of Applied Polymer Sci

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show abstract

“…The long period is estimated from this image to be about 18 nm. It should be emphasized that there is no report which demonstrates visually the formation of stackedlamellar structure in aromatic polyesters, except for our previous report concerning poly(ethylene 2,6-naphthalene dicarboxylate) (PEN) [16]. Fig.…”

Section: Methodsmentioning

confidence: 78%

“…Just after evaporation of the solvent, a thin molten polymer film was sheared/crystallized by displacing one of the two glass slides at the relative displacing speed of the glass slides of 12 m/min and then quenched to room temperature [16]. The film thickness is assumed to be about 50 nm which value was judged empirically from the transmittance for 200 kV electrons [16].…”

Section: Methodsmentioning

confidence: 99%

Morphological study by TEM on uniaxially oriented thin films of PBT

Yoshioka

Tsuji

Kawahara

et al. 2005

Polymer

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“…Our previous reports also showed that PET is less likely to crystallize in lamellar form under a uniaxial flow field, compared with other aromatic polyesters, such as poly(ethylene 2,6-naphthalene dicarboxylate) (PEN) and poly(butylene terephthalate) Downloaded by [The University of Manchester Library] at 06:56 21 November 2014 (PBT). [21,22] Therefore, it is supposed that each lamellar entity of the stacked-lamellar structure observed in Fig. 4 is not one coherent crystal but a so-called mosaic crystal composed of crystallites in plural number.…”

Section: Resultsmentioning

confidence: 99%

Stacked-Lamellar Structure in High-Speed Spun PET Fibers as Revealed by TEM

Yoshioka

Kawahara

Kikutani

et al. 2010

Journal of Macromolecular Science, Part B

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Morphological study of high-speed spun poly(ethylene terephthalate) (HSS-PET) fibers spun at 6 km/min was performed by a combination of alkaline etching, surface replica method, and transmission electron microscopy. In the two-stage replica of the alkalineetched fiber, the stacked-lamella-like structure was observed, in which lamella-like striations were stacked in a direction leaning at about 40 • away from the fiber axis. The spacing between the adjacent striations, namely the lamellar periodicity, was measured to be 10-30 nm. We have proposed that the stacked-lamellar structure, which is mainly composed of mosaic lamellar crystals and has the extended-chain crystals connecting the adjacently stacked lamellae, is an appropriate model for the fiber structure of HSS-PET fibers.

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Morphological study by TEM on uniaxially oriented thin films of PET, PEN and their blends

Cited by 23 publications

References 36 publications

Tailoring block‐copolyesters by reactive blending of polyethylene terephthalate and polyethylene naphthalate using statistical design of experiments

Tailoring block‐copolyesters by reactive blending of polyethylene terephthalate and polyethylene naphthalate using statistical design of experiments

Morphological study by TEM on uniaxially oriented thin films of PBT

Stacked-Lamellar Structure in High-Speed Spun PET Fibers as Revealed by TEM

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