Mandal, "Photoluminescence in small isotactic,
atactic and syndiotactic PVA polymer molecules in water," Chemical Physics, vol.
Four narrow molecular weight distribution grades of fully deuterated
atactic PS (PSd8) were purchased from Polymer Source (Dorval, Quebec, Canada).
Atactic PP fibers and the polymer concrete composites were exposed at various gamma radiation doses using a [sup.60]Co source.
Mulhaupt, "Determination of plateau moduli and entanglement molecular weights of isotactic, syndiotactic and
atactic polypropylenes synthesized with metallocene catalysts," Macromolecules 1998.
Intec, Wayne, NJ, which has been in business since 1980, is one of the country's leading manufacturers of modified roofing systems, both in torch-applied APP (
atactic polypropylene) membranes and hot asphaltor cold-applied SBS (styrene butadiene styrene) membranes.
Polypropylenes (PP) synthesized using traditional Ziegler-Natta catalysts are generally about 95% isotactic, with a few percent
atactic and some syndiotactic polymer.
Scientists have found this tendency can be overcome by adding
atactic polypropylene (APP) or styrene butadiene styrene (SBS) to the asphalt mix.
studied the oxo-degradability of expanded
atactic polystyrene (PS) that are formulated with cobalt and manganese based prooxidant additives [5].
The remainder of the material (if any) is
atactic polymer.
Conversely, the diminution in the amount of the triads leads to a large amount of
atactic insertion of the propylene monomer.
The new catalyst we have developed will broaden the molecular weight and produce resins with a fractional MFR, similar to what can be made with conventional Ziegler-Natta catalysts." Resins made with this catalyst have high purity, very little
atactic content, low acidity, and low chloride levels.