Controlling sandwich‐structure of PET microcellular foams using coupling of CO 2  diffusion and induced crystallization | Zendy

Li Dachao | Zendy; Liu Tao | Zendy; Zhao Ling | Zendy; Yuan Weikang | Zendy

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Controlling sandwich‐structure of PET microcellular foams using coupling of CO 2 diffusion and induced crystallization

Author(s) -

Li Dachao,

Liu Tao,

Zhao Ling,

Yuan Weikang

Publication year - 2012

Publication title -

aiche journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.958

H-Index - 167

eISSN - 1547-5905

pISSN - 0001-1541

DOI - 10.1002/aic.12764

Subject(s) - crystallization , crystallinity , materials science , amorphous solid , diffusion , fourier transform infrared spectroscopy , chemical engineering , sorption , diffusion process , composite material , saturation (graph theory) , thermal diffusivity , crystallography , adsorption , thermodynamics , chemistry , knowledge management , physics , innovation diffusion , mathematics , combinatorics , computer science , engineering

Controlling sandwich‐structure of poly(ethylene terephthalate) (PET) microcellular foams using coupling of CO 2 diffusion and CO 2 ‐induced crystallization is presented in this article. The intrinsic kinetics of CO 2 ‐induced crystallization of amorphous PET at 25°C and different CO 2 pressures were detected using in situ high‐pressure Fourier transform infrared spectroscopy and correlated by Avrami equation. Sorption of CO 2 in PET was measured using magnetic suspension balance and the diffusivity determined by Fick's second law. A model coupling CO 2 diffusion in and CO 2 ‐induced crystallization of PET was proposed to calculate the CO 2 concentration as well as crystallinity distributions in PET sheet at different saturation times. It was revealed that a sandwich crystallization structure could be built in PET sheet, based on which a solid‐state foaming process was used to manipulate the sandwich‐structure of PET microcellular foams with two microcellular or even ultra‐microcellular foamed crystalline layers outside and a microcellular foamed amorphous layer inside. © 2011 American Institute of Chemical Engineers AIChE J, 58: 2512–2523, 2012

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