PROCESS FOR PREPARING HIGH MOLECULAR CONTENT ESTER OF PROPYLENE GLYCOLGEORGE JOSEPH STOCKBURGERJOHN DAVID BRANDNER
Several substances can act as transfer agents in the polymerization of butadiene by Co catalysts. Allenes are particularly efficient, but ethylene, propylene and also H2can be used to reduce the polymer molecular weight. The data concerning some transfer agents are listed inTable 5.303The molecular...
In vivo calcification of polyethylene glycol diacrylate (PEG DA) hydrogels of molecular weight (MW) 400, 1000, 4000, 6000 and 10000 and polyethylene glycol tetraacrylate (PEG TA) of MW 18500 was investigated using a rat subcutaneous model. This study was performed in 4-wk-old rats for duratio...
Segmented poly(urethane–urea)s have been synthesized with mixed soft segments of ultra-low monol content poly(propylene glycol) (PPG) and tri(propylene glycol) (TPG) which allows the fabrication of quality elastomers without crosslinking. The narrow molecular weight distribution of the ultra-low ...
A polyolefin composition for electrical insulation which comprises polyolefin or crosslinked polyolefin and a small quantity of high-molecular weight polyethylene glycol. This composition is far less
49. The cured polymer comprising the product obtained by curing the prepolymer of claim 48. 50. The prepolymer of claim 1 comprising the reaction product of: (a) a poly(alkylene ether)glycol (A) having a number average molecular weight of from about 600 to about 3500; (ii) a diisoc...
A process for preparing a narrow molecular weight distribution poly(tetramethylene ether) glycol (PTMEG) from a PTMEG starting material via liquid-liquid extraction which employs methanol, water and non-polar solvent wherein the amount of non-polar solvent is, by weight, less than the PTMEG starti...
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recovery properties (S.R. ~50%, 10 tension cycles) of the resulting polypropylenes, as well as the visible light transmittance of approximately 90%, indicate the characteristics of the transparent elastomer. Keywords: α-diimine nickel(II) catalyst;propylene polymerization;polypropylene elastomer;high...
molecules Article Crystallinity, Rheology, and Mechanical Properties of Low-/High-Molecular-Weight PLA Blended Systems Hongwei Yang 1 and Jianghua Du 1,2,* 1 School of Materials Science & Engineering, North Minzu University, Yinchuan 750021, China 2 Key Laboratory of Polymer Materials & ...