Factors affecting the characterization of pore structure of PAN coagulated fibers by TPM
Thermoporometry(TPM)can be used to calculate the pore size and distribution,pore volume and internal surface area of materials according to the change degree of liquid-solid phase transition temperature in confined space.Taking wet-spun polyacrylonitrile(PAN)coagulated fiber as the research object,a set of methods for characterizing the pore structure parameters of PAN coagulated fiber by TPM were established through optimizing the sample treatment methods and test conditions.The results showed that the measurable pore size of TPM ranged from 1.7 nm to 50 nm.Both the sample preparation methods and the test conditions affected the test results of TPM.The PAN coagulated fibers should be freeze-dried before test,and the water ratio should be controlled not less than 2.84 g/g during the sample preparation.The pore structure parameters of PAN coagulated fibers were suitable to be characterized by continuous heating method,and the optimal heating rate was 1.0℃/min.
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