English

Styrenic block-copolymer polymerizable surfactants, when engaged in emulsion polymerization of core−shell acrylic latexes, are forming copolymers containing a large majority of monomer units. These copolymers can be extracted, and analyzed, after extensive washing of the particles by ultrafiltration.

ω-(p-Vinylphenyl)alkanols, including methanol, ethanol, propanol, pentanol, and hexanol, have been partially alkoxidated with potassium naphthalene to initiate anionic polymerization of ethylene oxide (EO) in order to directly prepare the corresponding α-p-vinylphenylalkyl-ω-hydroxy poly(ethylene oxide) (PEO) macromonomers. p-Vinylphenylmethanol, i.e. p-vinylbenzyl alcohol (VBA) afforded the expected well-defined macromonomer via living polymerization mechanism and the kinetics have been examined as a function of extent of potassium-alkoxidation.

Anionic polymerizations of 2-(4-vinylphenyl)ethoxy(trialkyl)silanes and 2-(4-vinylphenyl)ethoxy(t-butoxydimethyl)silane were investigated with oligo(α-methylstyryl)dilithium or -dipotassium as initiator in tetrahydrofuran at −78°C. These monomers readily polymerized to form ‘living polymers’. Subsequent deprotection of the silyl groups from the resulting polymers gave poly[2-(4-vinylphenyl)ethanol]s of the desired molecular weights with narrow molecular weight distributions ().

Purpose: In this experimental study, a sutureless scleral buckling was performed by using a tissue adhesive glue to fixate a silicone band to the sclera. In fact, one of the major risks of traditional scleral buckling is accidental perforation of the bulb, which is more frequent when the sclera is extremely thin as it is in newborns or in eyes with high myopia or scleromalacia.

Poly[2-(4-vinylphenyl)ethanol]s of known chain legth and of narrow molecular weight distribution have been synthesized by means of anionic living polymerization of the corresponding trimethylsilylated monomer, 2-(4-vinylphenyl)ethoxy-(trimethyl)silane, followed by acid hydrolysis. A block copolymer of poly[2-(4-vinylphenyl)ethanol-b-styrene-b-]2-(4-vinylphenyl)ethanol has also been prepared using living polystyryldianion as the initiator.

2-Cyanoacrylate represented by the formula: ##STR1## wherein R.sup.1 is a 1,2-alkylene group having 2-4 carbon atoms; R.sup.2 is an alkylene group having 2-4 carbon atoms and R.sup.3 is an alkyl group having 1-6 carbon atoms, said 2-cyanoarylates can be anion-polymerized with a slight quantity of water similarly to hitherto known 2-cyanoacrylates, and the resulting cured product is richer in flexibility than the hitherto known ones.

Purpose: In this experimental study, a sutureless scleral buckling was performed by using a tissue adhesive glue to fixate a silicone band to the sclera. In fact, one of the major risks of traditional scleral buckling is accidental perforation of the bulb, which is more frequent when the sclera is extremely thin as it is in newborns or in eyes with high myopia or scleromalacia.

A novel neopentyl alpha-cyanoacrylate is provided. It has superior adhesive properties even at high temperatures and whitening-preventing property.

New syntheses for neopentyl bromide and neopentyl chloride are reported which make these interesting aliphatic halides readily available in contraste to the previous methods used. These syntheses also provide unequivocal examples of reactions of the neopentyl-oxygen bond proceeding without rearrangement.