Dear Sagar Kumbhar, you did not specified which polymerization you are dealing with, polyolefins are synthsized from gaseous monomers, obviously the reactor should be closed, and pressure is applied for two main reasons, (a) to bring the gas monomers units into close contact to inter-react, (b) different pressure levels result in different molecular weights and chain architectures (linear, branched). The innert atmosphere is imposef to exclude oxygen which is an inhibitor/retarder to polyaddition reactions. Temperature degree depends on the initiator/catalyst used, to launch the reaction. My Regards
Dear Sagar Kumbhar ,
Polymer degradation is highly influenced by temperature & pressure. For most of the polymerization reactions, it has been reported that high temp., low pressure & inert atmosphere are the optimum condition for monomer growth. However, in my opinion it completely depends on the type of polymer you synthesizing. For instance, synthesis of Polyethylene, it was reported that synthesis through high pressure route was expensive for HDPE than low pressure. For more insights you may read:
https://www.nap.edu/catalog/2307/polymer-science-and-engineering-the-shifting-research-frontiers
Regards,
KP
Dear Sagar Kumbhar, you did not specified which polymerization you are dealing with, polyolefins are synthsized from gaseous monomers, obviously the reactor should be closed, and pressure is applied for two main reasons, (a) to bring the gas monomers units into close contact to inter-react, (b) different pressure levels result in different molecular weights and chain architectures (linear, branched). The innert atmosphere is imposef to exclude oxygen which is an inhibitor/retarder to polyaddition reactions. Temperature degree depends on the initiator/catalyst used, to launch the reaction. My Regards
Dear Sagar Kumbhar , you did not mentioned clearly . you are synthesizing conducting or non-conducting polymer. best of my knowledge polymers are degrade at high temperature. At room temperature , we have synthesized the polycarbzole.
Hi;
First of all the polymerization conditions depend on the type of polymers to be synthesized and the polymerization process. The polymerizations are carried out with a more or less high heat release. For example ethylene, vinyl chloride and propylene in polymerization releases respectively about 93, 97 and 104 kJ/mol of monomer.
It follows that these exothermic reactions will be favored by low temperature conditions, unless kinetic stresses require an increase in these temperatures. In addition, the polymerization reactions take place with a decrease in the number of molecules; the pressure of the gaseous reactant will generally have a favorable influence. Thus, in the case of high-pressure polymerization of ethylene, the polymerization rate is a linear function of pressure.
With my best regards
- Badges
- Science topic