Add time:08/21/2019         Source:sciencedirect.com

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 1H NMR, FT-IR, ESR, GPC, and MO calculations.

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