I am following this recipe for PBABr synthesis. I added HBr (48 wt % in H2O) to Methanol and PBA solution at 0 degrees celsius. But after 2 hours of stirring I am not able to see precipitates. I have to evaporate the solution at 50 degrees celsius to obtain precpitates, I did that and still did not see any precipitates. Please help me with this. Thanks in advance!