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Tandem free radical cycloaddition reaction of the N-Aziridinylimine intermediate produced tricyclo[5.3.1.0 1,5 ]undecane skeleton stereoselectively. A total synthesis of α-cedrene was completed in three step sequence from the cyclization product.
High nitrile terpolymers comprised of acrylonitrile (92 wt%), methyl acrylate (4 wt%), and hydroxylethyl methacrylate (4 wt%) (PAN) were synthesized and crosslinked using hexamethylene diisocyanate (HDI) terminated urethane prepolymer prepared from different molecular weights of poly(tetramethylene adipate) glycol (PTAd). The effects of urethane crosslinking and crosslinker length are studied. The...
Polyurethane (PU) anionomers were synthesized from phthalic anhydride, neopentyl glycol, isophorone diisocyanate and dimethylolpropionic acid (DMPA) according to a prepolymer-mixing process. Emulsion characteristics and basic structure-property relationships of the emulsion-cast film were studied with regard to the DMPA concentration, degree of neutralization (DN), prepolymer molecular weight (M...
Segmented polyurethanes (PUs) were prepared from polycaprolactone diols (PCLs), 4,4 -diphenylmethane diisocyanate, and 1,4-butanediol, and tested for shape memory effects. Effects of soft segment molecular weight (M n = 2000, 4000 and 8000), soft segment content (50-90%), and maximum strain ( m = 100, 200, and 600%) on the cyclic tensile properties as well as the dynamic mechanical,...
Melt blends of poly(methyl methacrylate) (PMMA) with a phenoxy (polyhydroxy ether of bisphenol A) have been prepared over the complete composition range using a single-screw extruder. Injection-moulded specimens of the blends were transparent, and differential scanning calorimetry and rheological measurements gave a single glass transition temperature (T g ), indicating miscibility of the...
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