Citation: Quan Fu An, Jin Wen Qian, Meng Wang, Yin Lu, Phillip Choi. Relation between the permeability and the degree of coil overlap of polymer in the bulk state[J]. Chinese Chemical Letters, ;2007, 18(11): 1423-1426. doi: 10.1016/j.cclet.2007.09.007 shu

Relation between the permeability and the degree of coil overlap of polymer in the bulk state

a Key Laboratory of Macromolecule Synthesis and Functionalization(Ministry of Education), Zhejiang University, Hangzhou 310027, PR China;
b Faculty of Science, Ningbo University, Ningbo 315211, PR China;
c Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6 G;
2.
G6, Canada

Received Date: 17 April 2007

Fund Project: The authors would like to acknowledge the financial support of this work by the NNSFC (No.20574059,20576056 and 50633030).

Based on the expression of the index of coil interpenetration (i. e., the degree of coil overlap, ξ_b) of amorphous polymers in the bulk state proposed by Qian, the ξ_b was rewritten as ξ_b=ρ_b[η]_θ/1.66 via Flory's intrinsic viscosity equation at theta conditions. The ξ_b of poly (vinyl chloride) (PVC) dense membranes with different molecular weights and cellulose diacetate (CA) dense membranes prepared using different solvents were determined. The permeability, permeation coefficient (P) of nitrogen and permeation flux (J) of liquid through both membranes, respectively, was measured. P and J decreased exponentially with increasing ξ_b for PVC and CA membranes were revealed.
- Degree of coil overlap,
- Permeability,
- Dense polymer membranes
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