Dear Borek, I am not quite sure what you mean by "part of the setup". This was my first time using this forum so I'm very sorry if I did anything wrong, I did not mean to offend anyone. Would it be okay if I reposted the question (while phrasing it better too) to make sure no spammer reacts to it?

Thank you for the reply, rjb. I will discuss about it, with you soon.

Greetings, esteemed experts.

As a professional in the building industry, I have noticed instances of paint flaws in houses shortly after the completion of projects. The primary causes of this issue are the presence of seams, the movement of water by capillary action in the bricks, and the infiltration of water into the walls. Another possible factor could be the limited duration of construction, which allows less time for the plaster on both interior and exterior walls to dry.

I would want to inquire about the availability of any chemical or polymer that may be added to the mixture of Portland cement and sand during the plastering of walls, both indoors and outdoors. The purpose of this addition would be to permanently seal any pores in the plaster, ensuring that no water can escape through them.

I require a cost-effective solution.

Thank you in advance for your assistance.

Hello, I have been trying to synthesize microspheres with Polystyrene (PS) in DCM organic phase and Polyvinyl alcohol (PVA) as an emulsifier in the aqueous phase. I have no trouble dissolving the PS, but for the PVA (98-99+% hydrolysed) no matter the molecular weight I can't seem to get a clear solution and I tried heating and even cooling the solution (saw a researchgate post and figured to try it out).

Subsequently, I mixed the two solutions together at a high spin rate of >1000 RPM. For the mid range molecular weight PVA, I managed to get some microsphere formation but with a lot of excess material. This excess material doesn't float while the microspheres do, so I presume the excess material is at least predominantly PVA which is denser than water?

Does anyone have any experience with this kind of synthesis, and if so can point out any mistakes I am making because apparently there should be 100% recovery by mass - which I am unsure if that means the weight of the microspheres should equate the weight of the PS I've added, or the total mass of the PS and PVA which is definitely not the case. And if the excess material is just excess PVA, what is a good way to get rid of it, as filtering just get the microspheres and PVA stuck together and centrifugation at 6000 rpm for 7 minutes results in some of the microspheres getting stuck in the "jelly" like excess 

Hey everybody, I am doing my Bachelor thesis on an organic synthesis. I was wondering if I were to add thionyl chloride (SOCl2) and dimethylformamide (together they form the Vilsmeier-Haack reagent) to 4-hydroxyphenylacetic acid, I would observe a polymerization reaction as the Vilsmeier-Haack reagent would convert the carboxylic acid into an acid chloride which could then be attacked by the remaining alcohol groups on the other molecules of 4-hydroxyphenylacetic acid.

The entire reaction I am trying to conduct involves the addition of triethylamine and a dimethyl formamide HCl salt to finalize the amidation reaction, however, adding the DMA.HCl has had no effect on the reaction mixture even though I would expect an exothermic reaction.

Thanks for the help in advance!