Unperturbed dimensions and interaction parameters of poly(vinyl alcohol)s in water-acetone and water-tetrahydrofuran mixtures

作者：Jha Mrinmay; Bardhan Soumik; Chakraborty Gulmi; Saha Swapan K^*

来源：Journal of Polymer Research, 2015, 22(9): 164.

DOI：10.1007/s10965-015-0808-1

• Poly(vinyl alcohol)
• Cosolvency
• Intrinsic viscosity
• Huggins constant
• Unperturbed dimension
• Molecular extension factor

The intrinsic viscosities [eta] of poly(vinyl alcohol)s (PVAs, which are biocompatible polymers)-with different (high, medium, and low) molecular weights were measured at 293-303 K in water (good solvent)-acetone (ACE, poor solvent) and water-tetrahydrofuran (THF, poor solvent) mixtures. The results observed, particularly the values of the Huggins constant (K (H)), indicated that the solvency of each PVA varied as a function of solvent composition (I broken vertical bar (ACE)/I broken vertical bar (THF)) and temperature. The unperturbed dimensions (K (theta)) of the PVAs under nontheta conditions in a variety of water-acetone and water-tetrahydrofuran solutions were also calculated using various equations. The values of K (theta) obtained via three different equations, i.e., those of Burchard-Stockmayer-Fixman (BSF), Berry, and Inagaki-Suzuki-Kurata (ISK), agreed well except for a few solvent compositions. The molecular extension factor (alpha (n)) and actual end-to-end distance (alpha (n) K (theta)) of each PVA were also computed.

• 出版日期2015-8-7