Cellulose acetate foams fabricated by solvent-assisted foaming via plasticization and enhanced CO2 diffusion

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2025-08-05 DOI:10.1016/j.supflu.2025.106734

Dongxu Tian, Junji Hou, Yimu Qiao, Chang Han, Jingbo Chen

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Abstract

In this study, a solvent-assisted foaming method via plasticization of ethyl lactate and enhanced CO2 diffusion was proposed to prepare microcellular cellulose acetate (CA) foams. Under the plasticization effect of ethyl lactate on CA, the glass transition temperature of CA30 (CA containing 30 wt% ethyl lactate) precursors was decreased to approximately 100 °C, thus decreasing the foaming temperature and broadening the foaming temperature window to 60 °C. By adjusting the foaming temperature and pressure, the expansion ratio of CA30 foams ranged from 2.3 to 21.6-fold. Samples with a smaller cell size (15 μm) achieved a compressive strength of 0.17 MPa, which was four times higher than that of foams with larger cell size (50 μm), when they had a similar expansion ratio. As the expansion ratio increased from 2.3 to 9.8-fold, the thermal conductivity of CA30 foams decreased rapidly, and then remained relatively stable. When the expansion ratio was 21.6-fold, the thermal conductivity was as low as 41.0 mW/(m·K).

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通过增塑化和增强CO2扩散的溶剂辅助发泡法制备醋酸纤维素泡沫

在本研究中，提出了一种通过乳酸乙酯增塑和增强CO2扩散的溶剂辅助发泡方法来制备微细胞醋酸纤维素（CA）泡沫。在乳酸乙酯对CA的塑化作用下，CA30（含30 wt%乳酸乙酯的CA）前驱体的玻璃化转变温度降至约100℃，从而使发泡温度降低，发泡温度窗扩大至60 ℃。通过调节发泡温度和压力，CA30泡沫的膨胀率在2.3 ~ 21.6倍之间。在膨胀比相同的情况下，小孔尺寸（15 μm）泡沫的抗压强度为0.17 MPa，是大孔尺寸（50 μm）泡沫的4倍。随着膨胀比从2.3倍增加到9.8倍，CA30泡沫的导热系数迅速下降，然后保持相对稳定。当膨胀比为21.6倍时，导热系数低至41.0 mW/（m·K）。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.