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Interaction between polyvinylchloride resins and di‐2‐ethylhexylphthalate
Author(s) -
Crose G. P.,
Glatti F.,
Pippa R.,
Vidotto G.
Publication year - 1985
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730070408
Subject(s) - plasticizer , isothermal process , materials science , polymer chemistry , mixing (physics) , composite material , chemical engineering , thermodynamics , physics , quantum mechanics , engineering
Abstract The interaction of two polyvinylchloride (PVC) resins, having different morphology, with di‐2‐ethylhexylphthalate plasticizer has been studied in a Brabender plastograph. Isothermal interaction occurring as a function of time, has been followed by recording the mixing resistance (torque) and determining, by means of a differential calorimeter, the fraction of the plasticizer free and interacted with the resin, on samples drawn out of the Brabender cell at different times. The interaction between PVC resins and di‐2‐ethylhexylphthalate X plasticizer in the temperature range of 63.7 to 74.3°C and with resin/plasticizer ratios varying from 1.11 to 3.33, has been determined to be: described formally by the first order kinetic law as it concerns the resin interacted as a function of time; dependent, as far as speed is concerned, on the morphology of resins namely on the specific surface area of the resin and depending whether or not there is a skin on the surface of the particles; independent of the resin/plasticizer ratio, at least in the examined range of ratios; affected by temperature according to an activation energy of 73 Kcal/mole for both the examined resins.The mixing torque recorded during the interaction kinetics of the plasticizer with the resins, has been found to be mainly affected by the outer surface state of the resin particles, namely by the concentration (which varies with the time) of the plasticizer in the surface layer of the particles. Systems constituted by PVC resins and di‐2‐ethylhexylphthalate, with the same resin/plasticizer ratio, interacting at different temperatures, show mixing torques coincident when plotted versus the concentration of the plasticizer in the surface layer of the particles.