Can I read Transition Phenomena of Polymers Near the Theta Conditions, 2 on EtoBox?

Transition Phenomena of Polymers Near the Theta Conditions, 2 by Tsitsilianis, Constantinos ;Dondos, Anastasios is a Chemistry article available to read on EtoBox.

What is Transition Phenomena of Polymers Near the Theta Conditions, 2 about?

In a recent paper') we have presented some preliminary results, which indicate that polystyrene exhibits a transition near its theta-conditions. In this communication we present some new results, obtained with a new polymer/solvent system. These observations corroborate our previous findings and suggest the idea that this transition must be a general phenomenon. Moreover, we show that any variation of the thetaconditions gives a corresponding variation of the transition point of the polymer. As already shown') a discontinuity in the variation of the intrinsic viscosity of polystyrene (PS) is observed at about 40 "C when the polymer is dissolved in cyclohexane. It is well known that this solvent is a theta-solvent for PS at 34°C. This transition is presented in Fig. 1 b. If now a little quantity of ethanol (precipitant of PS) is added, it will be evident that the theta-point must be observed at a higher temperature than 34 OC. As we can see in Fig. 1 a, the transition of PS is observed now at a temperature higher than in pure cyclohexane. On the contrary, if we add a little quantity of benzene (good solvent of PS) to the cyclohexane, the theta-conditions must be observed at a lower

Who reads Transition Phenomena of Polymers Near the Theta Conditions, 2?

Author

Tsitsilianis, Constantinos ;Dondos, Anastasios

Publisher

Wiley (John Wiley & Sons); Wiley (ISSN 0173-2803)

Published

1984

Language

EN

Field

Chemistry (Physical Sciences)