Hexaphenox - PVC adhesive based composite

A polyvinyl chloride (PVC) adhesive for joining PVC pipes consisting essentially of about 10 to 22 wt % PVC resin and about 2 to 25 wt % acrylic resin, a high vapor pressure solvent consisting essentially of about 10 to 50 wt % tetrahydrofuran and 0 to about 40 wt % methyl ethyl ketone, a low vapor pressure solvent consisting essentially of about 10 to 35 wt % cyclohexanone and 0 to about 35 wt % N-methyl pyrrolidone and up to about 5 wt % of at least one component selected from the group consisting of pigments, fillers, and thixotropic agents.
First experiments showed a very vigorous combustion of hexaphenox with PVC adhesive as a binder, compared to binders like polyvinyl acetate, epoxy or rosin:

After the successful test with 10g hexaphenox, 60g hexaphenox with 20g fresh PVC adhesive were mixed and casted into a 30mm ID PVC tube with a 10mm dia. round core. The casted propellant plus PVC tube had a mass of 92g. The propellant was left over night to set and came then the next morning for 2 hours at 85  °C into the baking oven to remove rests of the solvents. A mass reduction of 10.5g was observed. The propellant turned slightly brown at the end of the drying process.

Static test firing:

The mixture in the above video was not stoichiometric. A mixture of
  • 78 % w/w KClO3 
  • 8 % w/w hexamine
  • 5 % w/w phenolphthalein
  • 9 % w/w PVC adhesive (dry, whithout solvents)
is close to stoichiometric (nearly no resedues left after combustion).

Combustion of 7g nearly stoichiometric high power hexaphenox mix:

The tile was molten and cracked by the release heat. The amount of released gas was enormous.

Static test firing #2 (50g):

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