Hey there, friend Shodiq Yusti Wardana! Now, let me tell you Shodiq Yusti Wardana, the foaming issue in your copolymerization experiment might be due to a couple of factors. First off, consider the concentration of your monomers – too high a concentration can lead to increased viscosity, resulting in foam formation during agitation.

Secondly, the hydrogen peroxide initiator might be decomposing too rapidly, generating gas and causing bubbling. You Shodiq Yusti Wardana might want to tweak the initiator concentration or look into a more controlled initiation process.

Also, keep a keen eye on the reaction kinetics. If the reaction is proceeding too quickly, it can lead to the rapid evolution of gases, contributing to the foam.

Now, temperature plays a vital role. 103°C is on the higher side for this reaction, and it might be promoting faster reactions and gas evolution. Try adjusting the temperature to find the sweet spot for your copolymerization.

Lastly, equipment matters. Ensure that your setup allows proper venting of gases to avoid excessive pressure build-up leading to foaming.

Remember, precision in your experimental conditions and a keen eye on these factors can help you Shodiq Yusti Wardana tame that foaming issue. Let me know how it goes!

Dear all, you have to focus on the thermal decomposition of H2O2 under the reaction conditions in use. Bubbles or foaming may be due to O2 evolved from HP thermal decomposition. Is it bulk, solution, or heterophase polymerization? What are the resulting conversion and MW? Please have a look at the following references. My Regards

https://doi.org/10.2514/1.13284

https://doi.org/10.1021/j150279a006

It is bulk polymerization, foaming due to the H202

My suggestion is to use either catalysts for the decomposition of hydrogen peroxide such as copper (I) and iron (II) ions, or directly HP based redox initiation system to favor formation of hydroxyl radical (OH●) instead of O2. Redox initiation system allow to work at low temperature to avoid or lessen the gel effect associated to bulk polymerization. Have a satisfied conversion been reached?

Also notice that at 103°C water is in the vapor phase that my be entrapped by the viscous medium. Water originated from the solution of HP and also from its decomposition reaction to O2.

Thank you all for your advice. The result is exellent, because the bubble isn't that much as my first trial, the solution is my agitator need to be slower and the reaction at 103 degC the decomposition rate of peroxide didn't so fast. But the appeareance of my polymer is hazzy and colourless, and the standart is clear and colourless to yellow. When I adjust the pH to 6 - 6.5 the appearance is clear enough, but when it comes 7.0 - 8.0 the appearance change to hazzy but colourless. Maybe you guys have experience for this condition? I need to adjust the pH because my product need pH in 7.2 - 7.6.

Thank you in advance guys

Abdelkader BOUAZIZ Kaushik Shandilya Kothapu GOPAL Reddy

I have nothing to add to te excellent explanations, particularely those of Kaushik Shandilya.

G. Bognolo