1. SYNTHESIS AND COPOLYMERIZATION OF NEW ACRYLATE DERIVATIVES OF LIGNIN
B. Podkościelnaa, B. Gawdzika, M. Sobiesiaka, O. Sevastyanovab,
aDepartment of Polymer Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 5, Lublin, Poland
bKTH, Royal Institute of Technology, Department of Fibre and Polymer Technology, Division of Wood Chemistry and Pulp Technology, SE Stockholm, Sweden

2. INTRODUCTION
Lignin is one of the main components of the lignocellulosic material. Lignin structurally possesses properties which make it a promising starting material for chemical modifications, leading to the preparation of valuable polymeric materials with special properties. The reaction with acrylic or methacrylic acid is one of the possible types of such modifications resulting in the introduction of vinyl groups, capable for polymerization into lignin structure.

3. MODIFICATION
Lignin, kraft, alkali, Sigma-Aldrich

4. COPOLYMERIZATION
Lignin was added to the monomers before polymerization in three forms: a) unmodified (L-OH) (0, 1, 3 and 6 g), b) modified with acrylic acid (LA, 3g), c) modified with epichlorohydrin and then with acrylic acid (LEA, 3g).
Copolymerization of styrene with divinylbenzene and lignin or lignin derivatives was performed in the aqueous medium in suspension-emulsion procedure. The reaction mixture was stirred at 350 rpm for 18 h at 80oC.

5. Fig. 1 St-DVB-L-OH copolymers in form of microspheres
RESULTS
Fig. 1 St-DVB-L-OH copolymers in form of microspheres
Fig. 3 The exemplary samples of St-DVB copolymers without lignin, and obtained with different amounts of unmodified lignin (1g, 3g and 6g)
Fig. 2 ATR spectra
In Figure 2 , ATR spectra for unmodified lignin (L-OH) and its derivative obtained in reaction with acrylic acid (LA) are shown. Disappearance of signals of methoxyl groups (4 peaks in the range of cm-1) in lignin spectrum and appearance new peaks at 1175 cm-1 and 1720 cm-1 which correspond to the ester and carbonyl species vibrations, confirm the correct course of modification.

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CONCLUSIONS
•Vinyl derivatives of lignin were successfully prepared by reaction with acrylic acid (LA) and in two-step reaction with epichlorohydrin and acrylic acid (LEA) that was confirmed by ATR spectra.
•The prepared lignin containing components were copolymerized with styrene and divinylbenzene to obtained polymeric materials in form of microspheres.
•Surface area and total pore volume for copolymers containing lignin were smaller in comparison to parent St-DVB copolymer.
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