Reaction of sulphonyl azides with unstrained olefins
作者:Rudolph A. Abramovitch、Gerald N. Knaus、Mark Pavlin、William D. Holcomb
DOI:10.1039/p19740002169
日期:——
Aromatic sulphonylazides react readily with unstrained olefins to give imines ⇌ enamines which, on hydrolysis, give the corresponding sulphonamide and ketone. In some cases, rearrangement occurs during the nitrogen elimination step. Reduction of the imines in situ with sodium borohydride leads to the arenesulphonamides in good yield.
Long-chain branched polymers and production processes
申请人:BRASKEM AMERICA, INC.
公开号:US10266619B2
公开(公告)日:2019-04-23
This invention relates to a process for forming a long-chain branched polymer and a long-chain branched polymer resulting from the process. The process comprises reacting (a) a polyolefin base polymer with (b) a coupling agent comprising a polymeric coupling agent, optionally blended with a molecular coupling agent, the polymeric coupling agent being a modified polyolefin having a reactive coupling group at one or more terminal ends of the modified polyolefin chain, to couple the polyolefin base polymer (a) with the coupling agent (b) to form a long-chain branched polymer having a long-chain branching and/or higher surface energy relative to the polyolefin base polymer.
Azide-modified polynorbornene as polymeric coupling agent
申请人:BRASKEM AMERICA, INC.
公开号:US10829570B2
公开(公告)日:2020-11-10
This invention relates to a process for forming a long-chain branched polymer and a long-chain branched polymer resulting from the process. The process comprises reacting (a) a polyolefin base polymer with (b) a coupling agent comprising a polymeric coupling agent, optionally blended with a molecular coupling agent, the polymeric coupling agent being a modified polyolefin having a reactive coupling group at one or more terminal ends of the modified polyolefin chain, to couple the polyolefin base polymer (a) with the coupling agent (b) to form a long-chain branched polymer having a long-chain branching and/or higher surface energy relative to the polyolefin base polymer.
This invention relates to a process for forming a long-chain branched polymer and a long-chain branched polymer resulting from the process. The process comprises reacting (a) a polyolefin base polymer with (b) a coupling agent comprising a polymeric coupling agent, optionally blended with a molecular coupling agent, the polymeric coupling agent being a modified polyolefin having a reactive coupling group at one or more terminal ends of the modified polyolefin chain, to couple the polyolefin base polymer (a) with the coupling agent (b) to form a long-chain branched polymer having a long-chain branching and/or higher surface energy relative to the polyolefin base polymer.
A foamable composition including a polypropylene-based copolymer and a polyolefin is disclosed. The composition can be used to make a stiff foam with a high closed-cell content. Methods for producing the composition and the foam are provided.