Application of Three-Dimensional Solubility Parameter in Diffusion Behavior of Rubber-Solvent System and Its Predictive Power in Calculating the Key Parameters

• Published in: Macromolecular research 2022, 30(4), , pp.271-278
• Main Authors: Jiang, Xingwang, Hao, Yupeng, Wang, Huiyu, Tu, Jieyun, Liu, Guangyong
• Format: Article
• Language: English
• Subjects: Butadiene; Carbon black; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Copolymers; Diffusion; Diffusion coefficient; Ethylene vinyl acetates; Interaction parameters; Mathematical models; Nanochemistry; Nanotechnology; Nitrile rubber; Penetration; Physical Chemistry; Polymer Sciences; Polymers; Propylene; Rubber; Soft and Granular Matter; Solubility parameters; Solvents; Sorption; Swelling ratio; Thermodynamics; 고분자공학
• ISSN: 1598-5032; 2092-7673
• DOI: 10.1007/s13233-022-0029-5

Three different rubbers, hydrogenated nitrile butadiene rubber (HNBR), ethylene vinyl acetate copolymer (EVM) and ethylene propylene diene rubber (EPDM), and two blends, HNBR/EVM and HNBR/EPDM were compounded both with and without fillers, and were vulcanized with the same peroxide curing system. Peppas-Sahlin model was used to explain the diffusion mechanism of solvents in rubber vulcanizates. Transport parameters including diffusion coefficient, sorption coefficient and permeation coefficient were calculated and correlated with Flory-Huggins interaction parameters ( χ ). The Peppas-Sahlin model dealing with diffusion behaviors of solvents shows high degree of fitting for both unfilled and filled rubber-solvent systems. With the addition of carbon black, the diffusion coefficient increases while the sorption and permeation coefficients decrease. The sorption coefficient increases linearly with the permeation coefficient. New Flory-Huggins interaction parameter ( χ N ) calculated by three-dimensional solubility parameters shows better predictive power in diffusion behaviors than the traditional one ( χ T ). By mathematical fitting, a linear relationship can be obtained between the maximum swelling ratio and χ N , while an exponential relationship is gained for the permeation coefficient. The discovery of this rule connects three-dimensional solubility parameters with the swelling of polymer in solvent, which provides experimental basis for the further study of the medium resistance of polymer.