High molecular weight polycationics

Synthesis of high molecular weight polyethylene using FI catalyst

A FI Zr-based catalyst of bis[N-(3,5-dicumylsalicylidene)-2′,6′­diisopropylanilinato]zirconium(IV) dichloride was prepared and used for polymerization of ethylene. The effects of reaction conditions on the polymerization were examined in detail. The increase in ethylene pressure and rise in polymerization temperature up to 35 oC were favorable for catalyst/MAO to raise the catalytic activity as...

High-molecular-weight hemolysin of Clostridium tetani.

Clostridium tetani excretes hemolysins of two size classes, a high-molecular-weight hemolysin (HMH), which was eluted near void volume of a Sepharose 6B column, and conventional tetanolysin (molecular weight, approximately 50,000). The total hemolysin activity in the culture supernatant increased sharply with growth of bacteria and remained at a high level during autolysis. The content of HMH, ...

Nasal delivery of high molecular weight drugs.

Nasal drug delivery may be used for either local or systemic effects. Low molecular weight drugs with are rapidly absorbed through nasal mucosa. The main reasons for this are the high permeability, fairly wide absorption area, porous and thin endothelial basement membrane of the nasal epithelium. Despite the many advantages of the nasal route, limitations such as the high molecular weight (HMW)...

Microbial degradation of high-molecular-weight alkanes.

Measurements of biological O(2) demand showed that normal alkanes containing up to 44 carbon atoms were metabolized by microorganisms.

Impurities in High Molecular Weight Amine Products