Synthesis of a chain growth polymer (you use polystyrene as a keyword) in a highly viscose solvent non-reacting solvent can retard termination reactions, thereby giving higher molar mass. This is equivalent to the Trommsdorf effect when viscosity of a polymerising system becomes high and radical end groups cannot meet during diffusion. Oxygen must be excluded by using a nitrogen atmosphere. If after a first polymerisation, another monomer is injected (without opening the vessel to oxygen) polymerisation can continue making some diblock copolymer. There are papers on this topic, I have tried it to explore though not published.
Dear all,
I think the question still needs more clarification. First for the abbreviation PANI: it stands for polaniline or polacrylonitrile. Second, this composite is it a solution blend or what. Dr Robert talk about a polyaddition polymerization for styrene yes, but if the second polymer is the one from aniline, than how this copolymer is formed?
Are you looking for an interpenetrating polymer system.
Please if can add additional details. Regards
Dear Robert A. Shanks & Abdelkader Bouaziz,
Firstly thanks, for showing your interest toward this. I am using polyaniline (PANI) and polystyrene and it has well defined interface so it must be composite. The solvent I am using can its viscosity effect the synthesized composite, if yes than which property whether optical, electrical or structural ?
Dear all,
I think instead of looking to the solvant viscosity (which is meaningless in this situation), it will be better to think about the solvant power in dissolving both components of your solution blend, so that intimate coexistance of the two phases may be achieved uppon evaporating the solvant. However, in the case of polyaniline it is not possible to find an appropriate good solvant, and the best you can get is a fine dispersion (in fact this is the case of almost all conducting polymers).
Firstable, you sould note, that the system you are using is a blend with quite appreciable different Tgs, it is better to start with the phase diagram to know the position of LCST and UCST. Is your approach based on a thermodynamics background?. There are a lot of stuff to say here. Regards
Dear all,
one thing I forgot to stress on it. It is usually admissible to use the word "composite" when the components forming the mixture are different in chemical nature, e.g.; organic (polymer) and inorganic (filler, reinforcing agent such us glass fibers, and so on). On the other side when both (or more) components are polymers, the word "blend" is used. Regards
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