Block copolymers comprising a polytetrahydrofuran block and one or two [5]-polyurethane block(s): synthesis and characterization

Abstract

A-B Di-and B-A-B triblock copolymers with poly(tetramethyleneoxy) (poly(THF)) and poly(tetramethyleneoxycarbonylimino) (poly(TeU)) blocks were prepared by sequential polymerization of tetrahydrofuran (THF) and tetramethyleneurethane (TeU) with the monofunctional initiator methyl trifluormethylsulfonate and the bifunctional initiator trifluoromethanesulfonic acid anhydride, respectively. The block copolymers obtained after purification exhibit a monomodal narrow molecular weight distribution and a uniform microstructure of the two blocks as was deduced from gel permeation chromatography and NMR analysis. The block copolymers are semicrystalline materials with distinct melting points of the poly(THF) and the poly(TeU) domains.

Synthesis and Characterization of Cellular Polyurethane as Redox Catalyst

“…Then 7 ml of TDI and 2 ml of BDO were added drop wise into the melt with continuous stirring. The distilled water (1.9 mL) was added into the materials parallel to the stirring which started formation of cellular PUR [5]. Whole process was completed in few minutes.…”

“…These dyes are a great concern in effluent treatment due to their color and potential toxicity to animals and humans [4]. The common removal techniques for dyes include coagulation, ozonation, membrane process, filtration, adsorption and bioremediation [5]. All of these techniques have their own pros and cons.…”

“…Polyurethane (PUR) is produced by the polyaddition or ring opening type of reactions [5][6]. It is a versatile and very important class of synthetic polymers.…”

Low temperature splinting activity and catalytic behavior of nano Ag doped sulphamicacid bridged diblock copolymer

“…The thermal stability and other properties of the PTHF can be increased by the copolymerization. Poly(methylmethacrylate)‐based block copolymer of PTHF was reported by Yoshida et al Similarly, the other block copolymers of PTHF with 2‐methyl‐2‐oxazoline, urethane, PCL, poly(ethersulfone), styrene, and caprolactone were made. By thorough literature survey, we found few reports are available on the block copolymer of PTHF with PCL by using a single initiator for the both CL and THF polymerization.…”

Synthesis of Polytetrahydrofuran Using Protonated Kaolin as A Solid Acid Catalyst

“…Many researchers have been interested in the polymerization of THF because of its industrial applications in the synthesis of plastic and fiber materials [1][2][3][4][5][6][7][8]. The polymerization can be initiated by electrophilic agents, such as: Brønsted acids (HCl, H2SO4, HClO4, etc.)…”