Synthesis of polymers via cationic ring-opening polymerization using (NH 4 ) 3 PW 12 O 40 -SiO 2 composite catalyst
- PDF / 2,042,936 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 81 Downloads / 181 Views
ORIGINAL PAPER
Synthesis of polymers via cationic ring‑opening polymerization using (NH4)3PW12O40‑SiO2 composite catalyst Hisatoyo Morinaga1 · Fumiya Nishio2 · Sougo Yamashima3 · Hirotoshi Nakabayashi4 Received: 30 April 2020 / Accepted: 3 September 2020 / Published online: 6 October 2020 © The Polymer Society, Taipei 2020
Abstract Composite catalyst of heteropolyacid ammonium salt, ( NH4)3PW12O40, and S iO2 was prepared by sol–gel method. The resultant catalyst ((NH4)3PW12O40-SiO2, 3.38wt%) having W/Si molar ratio of 2/8 enabled to proceed ring-opening polymerizations of tetrahydrofuran (THF), ε-caprolactone (CL), and glycidyl phenyl ether (GPE) to give the corresponding poly(THF), poly(CL), and poly(GPE) having number-average molecular weights (Mn) of 6610, 4010, and 2370 with polydispersity index (Mw/Mn) of 1.57, 1.36, and 1.49 in 24%, 88%, and 59% yields, respectively. Matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS) spectra of poly(CL) and poly(GPE) exhibited that Brønsted acid induced from (NH4)3PW12O40-SiO2 is the only one species that initiates the polymerization. Keywords Heteropolyacid ammonium salt · Ring-opening polymerization · Sol–gel method · Solid-acid catalyst
Introduction Ring-opening polymerization is a powerful tool for affording linear polymers containing various functional groups in the main chains depending on kinds of monomers. Cationic ring-opening polymerizations of heterocyclic monomers such as cyclic esters, cyclic ethers, cyclic carbonates, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10965-020-02279-y) contains supplementary material, which is available to authorized users. * Hisatoyo Morinaga [email protected] * Hirotoshi Nakabayashi [email protected]‑ct.ac.jp 1
Faculty of Education, Graduate Faculty of Interdisciplinary Research, University of Yamanashi, 4‑4‑37, Takeda, Kofu, Yamanashi 400‑8510, Japan
2
Faculty of Education and Human Sciences, University of Yamanashi, 4‑4‑37, Takeda, Kofu, Yamanashi 400‑8510, Japan
3
Advanced Course in Materials Science and Engineering, National Institute of Technology, Kochi College, 200‑1, Monobe Otsu, Nankoku, Kochi 783‑8508, Japan
4
Department of Social Design Engineering, National Institute of Technology, Kochi College, 200‑1, Monobe Otsu, Nankoku, Kochi 783‑8508, Japan
oxazolines, and so on proceed using a wide variety of Lewis acids and Brønsted acids [1–6]. Solid-acid catalysts are environment-friendly catalysts due to their several advantages [7–10]: a) facile separation of catalyst from the product by filtration, b) negligible corrosion of reactor materials, c) no need of inactivation of catalyst, and d) reusable catalyst. Much attention to solidacid catalysts such as silicate gels [11], clay minerals [12, 13], zeolites [14], mixed oxide materials [15], anhydrous FeCl3 [16], and hetelopolyacids (salts) [17–20] is gathering in an application for polymer synthesis. Among them, heteropolyacids such as H 3PW12
Data Loading...
