摘要:
The present invention is directed to a method for preparation of polyolefins containing exo-olefin chain ends. The method involves quenching a cationic quasi-living polyolefin polymer system with one or more hindered secondary or tertiary amines.
摘要:
A composite sheet material, useful as a component of roofing shingles, and a process of making same, which includes a glass fiber web bound with a thermosetting resin which includes a fatty acid amide having the structural formula RCOONH2, where R is a C8–C25 alkyl.
摘要:
Blends of diaminoisopropylbenzene (DAIBP) and diaminoethylbenzene (DAEB) are provided for curing epoxy resins. The cured epoxy resins have increased tensile strength and slightly lower glass transition temperatures as compared with resins cured with either diamine alone.
摘要:
Disclosed is a method for preparing polyolefins containing vinylidine end groups from quasiliving carbocationically terminated polyolefin polymers by contacting the quasiliving carbocationically terminated polymer with a suitable nonaromatic heterocyclic ring quenching agent and substituted derivatives thereof.
摘要:
Disclosed is a method of preparing terminally functionalized telechelic polymers using a cationic living polymer product or a terminal tert-chloride chain end of a carbocationic quasiliving polymer product, which comprises quenching the polymer product with an N-substituted pyrrole to thereby functionalize the N-substituted pyrrole at the terminal reactive polymer chain end(s). Also disclosed are the terminal functionalized polyisobuyl N-substituted pyrrole compounds where the polyisobutyl group is substituted at the 2 and 3 position of the N-substituted pyrrole.
摘要:
The present invention is the synthesis of star polymers containing polyisobutylene (PIB) via the arm-first, core-last method. These polymers are superior in properties to known hydrogenated polyisoprene star-branched polymers due to their inherent lack of unsaturation.
摘要:
Elastomeric polymers comprising polymerized alpha-olefins or conjugated alkadienes are produced by cationic polymerization in the presence of titanium tetrachloride and an electron pair donor selected from pyridine or a non-hindered alkylpyridine. The polymers have very narrow, mono-modal molecular weight distributions such a achived by anionic polymerization. Polymerization of each monomer is terminated prior to broadening of the molecular weight distribution which significantly detracts from polymer properties.
摘要:
Provided herein are methods for preparing a polyolefin containing one or more exo-olefinic end groups on the polyolefin chain, comprising quenching an ionized polyolefin with an alkoxysilane or an ether. In some embodiments, the methods are represented by the following scheme: In some embodiments, the alkoxysilane or ether compound has the formula: wherein Y is carbon or silicon; R1 is hydrocarbyl; and R2-R4 are each, independently, hydrogen or hydrocarbyl.
摘要:
Stabilized pre-promoted unsaturated polymer resin systems that include a tertiary aromatic amine cure promoter. The stabilized curable resins systems can include a vinyl ester resin.
摘要:
Carboxy-terminated polyester ionomers useful for bioresorbable implant construction are described. They comprise biocompatible salts or partial salts of mono- or bis-carboxy-terminated polyesters.