DGIST Scholar: Effect of Dimethyl Sulfoxide on Synthesis of Thermoplastic Cellulose-Graft-Poly(L-lactide) Copolymer Using Ionic Liquid as Reaction Media

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Effect of Dimethyl Sulfoxide on Synthesis of Thermoplastic Cellulose-Graft-Poly(L-lactide) Copolymer Using Ionic Liquid as Reaction Media

Title: Effect of Dimethyl Sulfoxide on Synthesis of Thermoplastic Cellulose-Graft-Poly(L-lactide) Copolymer Using Ionic Liquid as Reaction Media

Author(s): Lee, Sung Jun ; Lee, Hae Sung ; Jeong, Sang Won ; Kim, Hyun-Chul ; Lee, Se Geun ; Oh, Tae Hwan

DGIST Authors: Lee, Sung Jun ; Jeong, Sang Won ; Kim, Hyun-Chul ; Lee, Se Geun

Subject: Biological Materials ; Biomaterials ; Cellulose ; Cellulose and Other Wood Products ; Copolymers ; Degree of Polymerization ; Dimethyl Sulfoxide (DMSO) ; Glass Transition ; Glass Transition Temperature ; Graft Polymerization ; Grafting (Chemical) ; High Viscosities ; Hydroxyl Groups ; Ionic Liquids ; Liquids ; Low Concentrations ; Organic Solvents ; Poly (L-Lactide) ; Polymerization ; Reinforced Plastics ; Ring Opening Polymerization ; Steric Hindrances ; Synthesis ; Synthesis (Chemical) ; Thermal Plasticization ; Thermoplastics ; Viscosity ; Wood

Abstract: In this study, ring-opening graft polymerization of L-lactide onto cellulose was carried out homogeneously in ionic liquid (IL)/dimethyl sulfoxide (DMSO) co-solvent as a reaction media. Through the effective control of high viscosity and steric hindrance caused by the interaction between the IL and the hydroxyl group of cellulose by adding DMSO as a co-solvent, cellulose-graft-poly(Llactide) (Cell-g-PLLA) copolymer with higher substitution efficiency was successfully prepared, at relatively low concentration of L-lactide. The maximum values of molar substitution, degree of lactyl substitution, and degree of polymerization of poly(L-lactide) in the copolymer were 3.76, 1.74, and 2.16, respectively, determined by 1H-NMR. The prepared cell-g-PLLA copolymers showed thermal plasticization with a glass transition temperature of 155C. In addition, the thermal processibility could be improved as the amount of grafted PLLA in the copolymer increased. © 2014 Wiley Periodicals, Inc.