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Tetrahydrofuran

About: Tetrahydrofuran is a research topic. Over the lifetime, 11778 publications have been published within this topic receiving 158241 citations. The topic is also known as: diethylene oxide & 1,4-epoxybutane.


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Journal ArticleDOI
TL;DR: In this paper, a bifunctional methacrylate monomer, namely, ethylene glycol di(1-methacryloyloxy)ethyl ether (1), was prepared through the addition reaction between methacric acid and methacrylic acid.
Abstract: A bifunctional methacrylate monomer, namely, ethylene glycol di(1-methacryloyloxy)ethyl ether (1), was prepared through the addition reaction between ethylene glycol divinyl ether and methacrylic acid. 1 was used as a cross-linker in the preparation of a star-shaped poly(methyl methacrylate) [poly(MMA)], a branched soluble poly(MMA), and a polymer gel. The addition of 1 to an anionically prepared living poly(MMA) solution generated a star-shaped polymer with a central poly(1) gel core and several poly(MMA) arms. On the other hand, when MMA and 1 were simultaneously added to a tetrahydrofuran (THF) solution of an anionic initiator, a branched soluble poly(MMA) or a polymer gel was obtained, depending on the amount of 1. The cross-linking points in the above polymers could be easily broken by hydrolysis under acidic conditions, leading to linear polymers. In contrast to the common polymer gels, the present polymer gel could be broken to soluble polymers in an acidic medium. However, it was just swollen in a...

42 citations

Journal ArticleDOI
TL;DR: In this paper, the vapor-hydrate equilibria were measured for CH 4 + C 2 H 6 + tetrahydrofuran (THF) + water systems in the temperature range of 274.15-282.15 K, pressure range of 1.0-3.0 MPa and THF concentration range of 4-14% in initial aqueous solution.

42 citations

Journal ArticleDOI
TL;DR: In this paper, the ring-opening polymerization of e-caprolactone in toluene at 25-50 C catalyzed by perfluor- oalkanesulfonates and perfluoroalkaneulfonimides as organic catalysts was examined.
Abstract: We examined ring-opening polymerizations (ROPs) of e-caprolactone in toluene at 25-50 � C catalyzed by perfluor- oalkanesulfonates and perfluoroalkanesulfonimides as organic catalysts. The ROPs proceeded quickly using these super Bronsted acids as catalysts. We synthesized poly(e-caprolac- tone)s (Mn ¼ 4.8 � 10 3 -13.5 � 10 3 ) with low polydispersity (Mw/Mn ¼ 1.10-1.48). These strong Bronsted acids catalyzed living polymerizations of e-caprolactone. After polymerization, Nf2NH was recovered and reused. To survey solvents, CHCl3 and tetrahydrofuran (THF) were used instead of toluene as solvents for polymerization. When THF was used as a solvent, not only e-caprolactone, but also THF was polymerized and incorporated into the polymer chain (incorporated THF ratio; 6- 10%). We investigated the reaction kinetics and activation thermodynamics of the organic catalysts. The activation energy and the activation enthalpy values for the ROPs of e-caprolac- tone using the catalyst having electron-withdrawing ligand were smaller, but the activation entropy value is more nega- tive. Moreover, the ranked values of the activation enthalpy for the reaction well parallel the polarity of solvents. The ranked values of the activation free energies well parallel those of the times required for polymerization completion. Our findings indicate that the super Bronsted acids are excellent catalysts for rapid ROP of e-caprolactone: they are more active than N, N-dimethylaminopyridine (DMAP) or stannous (II) 2-ethylhexa- noate (Sn(Oct)2). V C 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 000: 000-000, 2011

42 citations

Journal ArticleDOI
TL;DR: In this paper, the glass transition temperature (Tg) and solvent resistance of lignin-inspired poly(dimethoxyphenyl methacrylate)s were controlled by varying the position of the dimethoxy substituents in the constituent monomers.
Abstract: The macromolecular properties, including the glass transition temperature (Tg) and solvent resistance, of lignin-inspired poly(dimethoxyphenyl methacrylate)s were controlled by varying the position of the dimethoxy substituents in the constituent monomers. For the four dimethoxyphenyl methacrylate isomers investigated, with substituents at different locations on the phenyl ring (i.e., 3,5-; 2,3-; 2,4-; and 2,6-), the Tg’s of the resulting polymers spanned a wide range from less than 100 °C to greater than 200 °C. Rotational freedom and segmental interactions were responsible for the varying Tg’s. The polymers were thermally stable in air up to ∼300 °C, providing a suitable thermal processing window. The poly(dimethoxyphenol methacrylate) homopolymers also exhibited remarkably different solvent resistances to organic solvents, including tetrahydrofuran and chloroform. Furthermore, by copolymerizing various dimethoxyphenyl methacrylate isomers, the Tg and solvent resistance of the resulting macromolecules c...

42 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023194
2022382
2021124
2020154
2019193
2018218