Influence of solid surface on equilibria in polymer mixtures |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathumthani 12120, Thailand;2. College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China;3. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;4. Thailand Institute of Nuclear Technology, Ongkharak, Nakhon Nayok 26120, Thailand;5. Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand |
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| Abstract: | ![]()
The influence of solid disperse particles (aerosil) on phase equilibria in ternary (polymer-polymer-solvent) and binary (polymer-polymer) systems has been investigated using adsorption and gas chromatography techniques. The change in position and shape of the binodal for the ternary systems has been established. The region of thermodynamic compatibility of two polymers in a common solvent is broadened due to the selective adsorption of high molecular weight fraction of one of the polymers, this effect being dependent on the amount of solid particles introduced into the system. For binary systems, the thermodynamic interaction parameters χ23 have been determined and increasing thermodynamic stability of the mixture in the presence of the solid phase has been discovered. The complicated dependences of the interaction parameters on mixture composition are connected with differences in selectivity of adsorption for various compositions. It is supposed that increased thermodynamic stability of a mixture of two incompatible polymers in the presence of solid is due to the transition of both polymers into adsorption and border layers. |
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