Studies on polyester packaging. Effects of basic washing on multi-use PET and PEN bottles

Safa, Hassan; Bourelle, F.

doi:10.1002/(sici)1099-1522(199903/04)12:2<67::aid-pts453>3.0.co;2-0

Cited by 7 publications

(2 citation statements)

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“…As PEN is much more expensive than PET, properties of PET/PEN blends have been widely investigated recently, due to their enhanced mechanical, thermal, and barrier properties bestowed to these mixtures by the presence of a small amount of PEN. [1][2][3][4][5][6][7][8][9] However, to achieve good barrier properties of PET/PEN blends, studies indicate that PEN needs to form the disperse phase in a continuous phase of PET, and also that a specific configuration and scale of the disperse PEN phase is necessary for optimal barrier properties. It is the disperse phase configuration of PEN that has a strong effect on the barrier properties of PET/PEN blends.…”

Section: Introductionmentioning

confidence: 99%

“…This is a shortcoming that can be overcome by blending PET with poly(ethylene 2,6‐naphthalate) (PEN), which due to its rigid rod backbone structure features enhanced stiffness and improved gas barrier characteristics. As PEN is much more expensive than PET, properties of PET/PEN blends have been widely investigated recently, due to their enhanced mechanical, thermal, and barrier properties bestowed to these mixtures by the presence of a small amount of PEN 1–9…”

Section: Introductionmentioning

confidence: 99%

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Study on phase separation of PET/PEN blends by dynamic rheology

Wagner

Liu

et al. 2008

J of Applied Polymer Sci

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Blends of poly(ethylene terephthalate) (PET) and poly(ethylene naphthalate) (PEN) were processed into biaxially drawn films, and samples taken from the bi-oriented films were then investigated by dynamic rheology experiments in the melt state. Storage modulus G 0 and loss modulus G 00 were determined in the frequency range of 10 22 -10 2 rad/s at temperatures between 260 and 3008C. Although the time-temperature superposition (TTS) principle was found to hold in the high frequency regime, a breakdown of TTS was observed at low frequencies, and the terminal behavior of the storage modulus G 0 of the blends departs drastically from the terminal behavior observed for the blend components. This is caused by interfacial surface tension effects. The results indicate that despite the effect of transesterification reactions, the PET/PEN blend systems investigated consist of a microseparate phase of PEN platelets in a matrix of PET. This morphology is produced when the blends are processed into biaxially oriented PET/PEN films, and droplets of PEN are deformed into a lamellar structure consisting of parallel and extended, separate layers. The large interfacial surface area of the bi-oriented PET/PEN blends leads to remarkably strong interfacial tension effects in dynamic rheology measurements.

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