Studies of Poly-2-vinylpyridine. I. Suspension Polymerization and Molecular Weight Distribution

Calculation of Molecular Weight Distribution from Molecular Weight Moments in Free Radical Polymerization

A novel method is presented for the calculation of weight chain length distribution in free radical polymerization of vinyl monomers. In the proposed method, polymerization kinetic equations and molecular weight moment equations are used in conjunction with a function that defines the weight fraction of polymer in a finite chain length interval. The entire range of molecular weight is divided i...

postnatal studies of bats (pipistrellus kuhlii and miniopterus schreibersii) & histomorphology and histochemistry studies of organs and diseases of (neurergus microspilotus and n. kaiseri)

1. to determine whether difference in birth body mass influenced growth performance in pipistrellus kuhlii we studied a total of 12 captive-born neonates. bats were assigned to two body mass groups: light birth body mass (lbw: 0.89 ± 0.05, n=8) and heavy birth body mass (hbw: 1.35 ± 0.08, n=4). heavier body mass at birth was associated with rapid postnatal growth (body mass and forearm length) ...

Dynamic Evolution of Droplet/Particle Size Distribution in Suspension Polymerization of Styrene

Poly (Vinylidene Fluride) Membrane Preparation and Characterization: Effects of Mixed Solvents and PEG Molecular Weight

In this study, polyvinylidene fluoride (PVDF) ultrafiltration membranes were prepared via immersion precipitation method using a mixture of two solvents triethyl phosphate (TEP) and dimethylacetamide (DMAc), which had different affinities with the nonsolvent (water). Properties of the prepared membranes were characterized using scanning electron microscope (SEM) and contact angle and membrane p...

Ring-opening polymerization of strained metallocenophanes: a new route to high molecular weight poly(metallocenes)*

Ring-opening polymerization (ROP) of strained ring-tilted metallocenophanes can be achieved thermally, via anionic initiation, or by the use of transition metal catalysts and provides access to a wide range of high molecular weight (Mw ˆ 10 ±10, Mn> 10 ) poly(metallocenes). These materials possess a variety of interesting properties and many are very easy to prepare. This article provides an ov...