Solubility and diffusion behavior sof CO2 in PPO and PS blends

doi:10.19491/j.issn.1001-9278.2022.10.011

Abstract

Abstract:

In this paper， supercritical CO₂ was used as a foaming agent to investigate its dissolution and diffusivity in PPO/PS blends through a weight decay method. The effects of process parameter and PPO/PS composition on the solubility and diffusion coefficient of CO₂ were systematically studied under static conditions. The quantitative relationship between the temperature， pressure， and PPO content and the CO₂ solubility was established. The results indicated that the solubility of CO₂ in PPO/PS blends increased with an increase in the PPO content and pressure but a decrease in temperature. The diffusion coefficient decreased with an increase in the PPO content but increased with an increase in temperature and saturation pressure.

Key words: polyphenylene ether, polystyrene, supercritical carbon dioxide, solubility, diffusion coefficient

CLC Number:

TQ325.2

QIAO Shize, GUO Menghao, HE Yadong, XIN Chunling. Solubility and diffusion behavior sof CO₂ in PPO and PS blends[J]. China Plastics, 2022, 36(10): 71-76.

Figures/Tables 11

Fig.1. Solubility of CO2 in MPPO at different temperature

样品	亨利常数与温度的关系表达式
MPPO⁃20	$H = 5.82 × 10 - 9 e x p (3 955 T)$
MPPO⁃30	$H = 5.2 × 10 - 9 e x p (4 075 T)$
MPPO⁃40	$H = 3.21 × 10 - 9 e x p (4 314 T)$
MPPO⁃50	$H = 1.86 × 10 - 9 e x p (4 652 T)$

样品	亨利常数与温度的关系表达式
MPPO⁃20	$H = 5.82 × 10 - 9 e x p (3 955 T)$
MPPO⁃30	$H = 5.2 × 10 - 9 e x p (4 075 T)$
MPPO⁃40	$H = 3.21 × 10 - 9 e x p (4 314 T)$
MPPO⁃50	$H = 1.86 × 10 - 9 e x p (4 652 T)$

Tab.1. Henry's constant expressions for different compositions of MPPO

Fig.2. Comparison of experimental values of CO2 solubility in MPPO with those calculated by Eq

样品	CO₂在MPPO中的溶解度与温度和压力的关系表达式
MPPO⁃20	$C = 2.42 × 10 - 7 e x p (3 955 T) × P$
MPPO⁃30	$C = 2.16 × 10 - 7 e x p (4 075 T) × P$
MPPO⁃40	$C = 1.33 × 10 - 7 e x p (4 314 T) × P$
MPPO⁃50	$C = 7.72 × 10 - 8 e x p (4 652 T) × P$

样品	CO₂在MPPO中的溶解度与温度和压力的关系表达式
MPPO⁃20	$C = 2.42 × 10 - 7 e x p (3 955 T) × P$
MPPO⁃30	$C = 2.16 × 10 - 7 e x p (4 075 T) × P$
MPPO⁃40	$C = 1.33 × 10 - 7 e x p (4 314 T) × P$
MPPO⁃50	$C = 7.72 × 10 - 8 e x p (4 652 T) × P$

Tab.2. Expressions of CO2 solubility versus temperature and pressure

Fig.3. Solubility of CO2 in MPPO with different compositions at different pressure

Fig.4. Relationship between CO2 solubility and PPO content under different pressure

Fig.5. Dynamic rheological scan of MPPO

Fig.6. Diffusion coefficient values of MPPO⁃50 at different temperature under different pressure

样品	压力/MPa	方程式
MPPO⁃50	10	$D = 9.45 × 10 - 6 ∙ e - 1943.3 T$
	15	$D = 2.75 × 10 - 5 ∙ e - 2605.4 T$
	20	$D = 6.77 × 10 - 5 ∙ e - 2959.7 T T$

样品	压力/MPa	方程式
MPPO⁃50	10	$D = 9.45 × 10 - 6 ∙ e - 1943.3 T$
	15	$D = 2.75 × 10 - 5 ∙ e - 2605.4 T$
	20	$D = 6.77 × 10 - 5 ∙ e - 2959.7 T T$

Tab.3. Equation of diffusion coefficient of MPPO⁃50 at different pressure

Fig.7. Diffusion coefficients of CO2 in MPPO at different temperature under different pressure

Fig.8. Variation of diffusion coefficient with PPO content

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Solubility and diffusion behavior sof CO₂ in PPO and PS blends

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