Hello, I'm looking to purchase syndiotactic polypropylene (sPP). Most articles I find cite purchasing it from Sigma Aldrich, but they sold their last stock in 2013. MilliporeSigma has isotactic polypropylene, but not syndiotactic.
I have seen how to synthesize sPP from Miller and Bercaw, but it would be desirable to buy it premade. Any help would be appreciated. Thanks!