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The sorption behaviors in PLLA-CO2 system and its effect on foam morphology

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Abstract

The sorption behavior, physical properties, and foam morphologies in poly(L-lactic acid) (PLLA)-CO2 system were studied in this paper. The solubility and diffusion coefficient of CO2 in PLLA in the range of 0 °C to 45 °C and pressure up to 5.5 MPa were investigated. The diffusion coefficients were analyzed to determine the plasticization glass transition temperature (T g ) of the PLLA-CO2 systems. The data of T g s of PLLA at various CO2 pressures demonstrated that PLLA-CO2 system exhibited a retrograde vitrification behavior, which has never been reported on semi-crystalline polymer-gas system by systematic measurement of solubility data. The sorption curves of PLLA at certain temperatures and pressures exhibited a characteristic keen which indicated the rejection of CO2 from the polymer matrix due to CO2-induced crystallization. The fundamental understanding of PLLA-CO2 interactions was utilized to control the CO2 solubility and crystallinity in PLLA thus the physical properties, in order to develop various unique foam structures.

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Author notes

  1. Arghavan V. Nawaby

    Present address: Sealed Air Corporation, 2401 Dillard Street, Grand Prairie, TX, 75051, USA

Authors and Affiliations

  1. College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, China

    Xia Liao

  2. Institute for Chemical Process and Environmental Technology, National Research Council of Canada, Ottawa, Ontario, K1A 0R6, Canada

    Xia Liao & Arghavan V. Nawaby

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  1. Xia Liao
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  2. Arghavan V. Nawaby
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Correspondence to Xia Liao.

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Liao, X., Nawaby, A.V. The sorption behaviors in PLLA-CO2 system and its effect on foam morphology. J Polym Res 19, 9827 (2012). https://doi.org/10.1007/s10965-012-9827-3

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  • DOI: https://doi.org/10.1007/s10965-012-9827-3

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