Novel method of the surface modification of the microcrystalline cellulose powder with poly(isobutyl vinyl ether) using mechanochemical polymerization
| Autor: | Toshiyuki Motokawa, Tatsumi Kawaguchi, Takeshi Ohura, Tadahisa Iwata, Yukiko Enomoto-Rogers, Masakazu Makino, Masato Sakaguchi |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
General Chemical Engineering Cationic polymerization Vinyl ether Microcrystalline cellulose chemistry.chemical_compound Polymerization X-ray photoelectron spectroscopy chemistry Mechanics of Materials Polymer chemistry Copolymer medicine Surface modification Ball mill medicine.drug |
| Zdroj: | Advanced Powder Technology. 26:1383-1390 |
| ISSN: | 0921-8831 |
| Popis: | The surface modification of microcrystalline cellulose (MCC) powder with poly(isobutyl vinyl ether) (PIBVE) chains of block copolymers of MCC and PIVBE (MCC-block-PIBVE) was produced by ball milling of MCC with isobutyl vinyl ether (IBVE) in vacuum at 77 K. The polymerization of IBVE was initiated by mechano-cations of MCC (MCC + ) on the MCC powder surface in vacuum at 77 K. MCC + s located on the surface of MCC powder were produced by heterogeneous scissions of the β-1,4 glycosidic linkages comprising MCC main chain by ball milling in vacuum at 77 K, and existed on the powder surface of MCC in vacuum at 77 K as cations isolated from counter mechano-anions. The counterion-free MCC + s on the powder surface of MCC interacted with IBVE during milling, covalently bonded to IBVE, and simultaneously formed counterion-free cations (MCC-IBVE + ) on the MCC powder surface. The counterion-free MCC-IBVE + s initiated a novel cationic polymerization of IBVE on the surface of MCC powder under vacuum, produced MCC-block-PIBVE, and gave rise to a surface chemical modification of MCC powder with MCC-block-PIBVE. This scheme is supported by 1 H NMR, FT-IR, ESR, GPC, and MO calculations. |
| Databáze: | OpenAIRE |
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