Bulk Polymerization of Styrene with 2,2-Azobisisobutyronitrile in a Dilatometer

Bulk Polymerization of Styrene with 2,2 -Azobisisobutyronitrile in a Dilatometer 

Safetyprecautions QefoK this experiment is carried out,Sect.2.2.5 must be read as well as the material safety data sheets (MSDS) for all chemicals and products used. 

/(is a constant that can be calculated from the specific volumes of the monomer and polymer at the appropriate temperature. One can, however, also determine the relationship between U and AU by direct experiment. 

The following amounts of 2,2 -azobisisobutyronitrile (AIBN) are weighed into 4 graduated 25-ml flasks 35,110,180, and 250 mg (0.21,0.67,1.10, and 1.52 mmol).The flasks are filled to the mark with destabilized styrene (at 20 °C) and the amount of styrene divided by 25 ml gives the density at 20 °C (neglecting the partial volume of AIBN). 

The dilatometers are emptied as follows.The dilatometer, cooled in ice to below 10 °C, is inclined carefully over a small beaker, the capillary is lifted from the dilatometer, the polymer solution poured into a beaker and the capillary and dilatometer bulb washed 

---