Influence of quadrupole moments on the efficiency of pore formation in cellulose propanoate ester/1,2,3-propanetriol composite

초록

In this study, we developed microporous membranes from cellulose propanoate ester (CP), which is known for its superior thermal stability and mechanical strength. To enhance the flexibility of these membranes, 1,2,3-propanetriol was incorporated as a plasticizer. Gas pressure was then applied to facilitate pore formation, and we investigated the effect of the gas's quadrupole moment on the pores and overall properties of the CP/1,2,3propanetriol composite membranes. The higher quadrupole moment of CO2 led to stronger interactions with the residual solvent around 1,2,3-propanetriol within the CP matrix, resulting in more efficient pore formation compared to N2. At a pressure of 3 bar, the permeance of CO2 was 0.45 GPU, significantly higher than that of N2, as confirmed by scanning electron microscopy (SEM) analysis. Membranes permeated with CO2 exhibited a greater number of pores and a denser structure, increasing porosity and improving wettability by 63.3 %. Fourier-transform infrared spectroscopy (FT-IR) analysis revealed enhanced interactions between CP chains and 1,2,3-propanetriol in the CO2-permeated membranes, suggesting improved mechanical strength and thermal stability due to the denser polymer chain arrangement. However, thermogravimetric analysis (TGA) indicated a decrease in thermal stability in these membranes, attributed to their higher porosity.

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