Preparation of a Thermoplastic Lignin-Based Biomaterial through Atom Transfer Radical Polymerization

초록

Graft copolymerization of styrene onto kraft lignin (KL) was achieved by atom transfer radical polymerization (ATRP) using a fully substituted lignin-based macroinitiator (KLM). The number average of molecular mass (M-n) of polystyrene copolymer graft side-chains was achieved by varying the ratio of the DMF: water solvent system from 5:0 to 1:4. A M-n of up to approximate to 206,000 was obtained using a DMF/water ratio of 3:2 (v/v). However, as the M-n increased, the overall ATRP became less controlled. In addition, the thermal properties of the lignin-g-polystyrene copolymers improved significantly with increasing M-n of polystyrene copolymer side-chains.

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