E.i. Dupont De Nemours and Company

Cornell University

American Telephone and Telegraph, Co.

Dotsevi Y Sogah

William Brown Farnham

Walter R Hertler

Gary N Taylor

Osman Rathore

Jianbo Di

Sharon Loretta Haynie

William J Middleton

Patrick H Fitzgerald

Owen W Webster

Ira B Dicker

Thomas W Del Pesco

Yaru Shi

Evan D Laganis

Mureo Kaku

Xiao-Ping Chen

Sarav Bharat Jhaveri

Lisa C Grimminger

Replacement of the amorphous peptide domain of a structural biopolymer, such as silk from silkworms or spiders, with a nonpeptide segment while maintaining the &#x3b2;-sheet forming crystalline segments provides synthetic multiblock copolymers having solid-state structures and mechanical properties similar to the naturally occurring structural biopolymer is described herein. Such synthetic multiblock copolymers may be produced as films or fibers.

Multiblock copolymers having improved mechanical properties

Solution blending of masterbatch of cationically functionalized polyvinyl acetate copolymer/silicate nanocomposite where the silicate is substantially exfoliated, and ethylene-vinyl acetate copolymer (EVA), produces product of increased tensile strength and Young's Modulus compared to neat EVA and reduced flammability compared to neat EVA. The product can be injection molded or compression molded or extruded without loss of these advantages.

Ethylene-vinyl acetate copolymer of increased mechanical properties

Silicate anchored multifunctional initiator has moiety initiating ring opening living polymerization of lactone or ethylene oxide or cyclic siloxane monomer and other moiety for initiating living free radical polymerization of ethylenically unsaturated monomer. The monomers are reacted with the initiator in a one-pot, one-step reaction to cause living polymerization of both monomers and exfoliation of silicate layers to provide dispersed block copolymer silicate nanocomposite, with the junction of the two blocks being anchored to silicate layer and each block dangling therefrom.

One-pot, one-step in situ living polymerization from silicate anchored multifunctional initiator

Photoinitiator modified silicate and ethylenically unsaturated monomer are reacted in solvent to cause living polymerization of monomer and exfoliation of silicate layers and cause attachment of silicate layers to polymer chains, thereby providing dispersed homopolymer or block copolymer silicate nanocomposites.

Photoinitiator anchored to silicate and use thereof to prepare polymer exfoliated silicate nanocomposite

Free radical living polymerization attached nanocluster (metal oxide, e.g., gamma-FeOor FeO nanocluster or quantum dot (e.g., CdSe) nanocluster, are used for polymerization of polymer or copolymer to provide nanocomposite polymers or copolymer arms around nanoclusters.

Free radical living polymerization initiator attached nanoclusters and nanocomposites therefrom

Polyurethane surfaces are made more biocompatible, particularly with blood, by treatment with a block copolymer of a fluorinated oxazoline and either 2-methyl- or 2-ethyl-2-oxazoline. Such polyurethanes are useful as vascular graft or artificial heart parts.

Biocompatible polyurethanes by treatment with polyoxazoline block

Excellent resolution and sensitivity in the patterning of resists utilized in device and mask manufacture is obtained with a specific composition. In particular this composition involves polymers having recurring pendant acid labile .alpha.-alkoxyalkyl carboxylic acid ester moieties in the presence of an acid generator activated by actinic radiation such as UV-visible, deep ultraviolet, e-beam and x-ray radiation.

Resist material and process for use

'Living' polymers and their preparation in the absence of a co-catalyst at a pressure greater than about 50 MPa, from polar acrylic or maleimide monomers and organosilicon, -tin or -germanium initiators.

Uncatalyzed process for preparing 'living' polymers

Acrylic 'Ladder' polymers and their preparation from difunctional monomers and difunctional initiators.

'Acrylic' ladder polymers

Novel silicon-based initiators, for example, [(1-methoxy-2-methyl-1-propenyl)oxy]trimethoxysilane, for Group Transfer Polymerization.

Group transfer polymerization and initiators therefor

Improved process of polymerizing a polar monomer with selected initiators and catalysts, the improvement consisting of having present a chain transfer agent having a pKa greater than 18 but less than 25 and containing at least one reactive hydrogen atom which terminates the growth of 'living' polymer.

'Living' polymers and chain transfer-regulated polymerization process

Tris(dialkylamino)sulfonium bifluoride salts are obtained by hydrolysis, methanolysis, or pyrolysis of corresponding tris(dialkylamino)sulfonium difluorotrimethylsilicates, reaction of dialkylaminotrialkylsilanes with sulfur tetrafluoride, or reaction of bis(dialkylamino)sulfur difluorides with dialkylamines. These bifluoride salts, which have the general formula (R.sup.1 R.sup.2 N)(R.sup.3 R.sup.4 N)(R.sup.5 R.sup.6 N)S.sup..sym. HF.sub.2.sup..crclbar., are useful polymerization catalysts.

Tris(dialkylamino)sulfonium bifluoride catalysts

This invention resides in a polymerization process which is catalyzed by an oxyanion which can form a conjugate acid having a pKa (DMSO) of about 5 to about 24.

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Ithaca, NY, United States of America

Dotsevi Y Sogah