Interesting post, surfed over here from the academic Spotlight efforts from coinbitgold.

Did i understand it correctly, PHA is manufactured inside the bacteria inself, and doesn't goes through any conventional polymerisation process using C2 as a base monomer? If so, then the bottleneck is still economies of scale... a conventional large scale PE gas phase reactor have a reactor throughput of 40 tons/hr....

To be commercially feasible, i suppose the fermentation process have to be faster than 40tons/hr before it can compete with the conventional material. Keep up the positive efforts, and looking forward to breakthroughs !