Synthesis of Poly(D-lactide) with Different Molecular Weight via Melt-Polymerization

Purba Purnama; Youngmee Jung; Chae Hwan Hong; Do Suck Han; Soo Hyun Kim

Macromolecular Research, Vol.20, No.5, 515-519, May, 2012

DOI10.1007/s13233-012-0072-8 Export Citation

Synthesis of Poly(D-lactide) with Different Molecular Weight via Melt-Polymerization

Purba Purnama^{1, 2}, Youngmee Jung^{1, 3}, Chae Hwan Hong⁴, Do Suck Han⁴, and Soo Hyun Kim^{1, 3, †}

¹Biomaterials Research Center, Korea Institute of Science and Technology, Seoul, 136-791, Korea
²University of Science and Technology, Daejeon, 305-333, Korea
³, Korea
⁴Central Advanced Research and Engineering Institute, Hyundai-KIA Motors, Gyeonggi, 445-706, Korea

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Polylactide is considered as “Green Polymer” due to its sustainability. Poly(D-lactide) is absolutely required in order to make stereocomplex polylactide. But, there is no report about D-lactide polymerization. Various molecular weight of poly(D-lactide) were successfully polymerized from D-lactide in the melt stage using various catalysts. Stannous octoate, aluminum isopropoxide and lanthanum isopropoxide has better solubility in the molten monomer compared to yttrium isopropoxide oxide. We obtained high conversion (99.17%) and high molecular weight (Mn=384,992) using stannous octoate. We also obtained high conversion(94.46%) and medium molecular weight (Mn=78,634) using aluminum isopropoxide. This data is suitable for industrial applications. In the kinetic study, stannous octoate has higher polymerization rate (kp=10.8×10^(-2) min^(-1)) compared to the aluminum isopropoxide (kp=7.3×10^(-2) min^(-1)).

Keywords:D-lactide;melt;polymerization;kinetic.

[References]

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[3] Platel RH, Hodgson LM, Williams CK, Polym.Rev., 48, 11 (2008)

[4] Dubois P, Jacobs C, Jerome R, Teyssie P, Macromolecules., 24, 2266 (1991)

[5] Kricheldorf HR, Berl M, Scharnagl N, Macromolecules., 21, 286 (1988)

[6] Eguiburu JL, Fernandez-Berridi MJ, Cossio FP, San Roman J, Macromolecules, 32(25), 8252 (1999)

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[8] Marshall EL, Gibson VC, Rzepa HS, J. Am. Chem. Soc., 127(16), 6048 (2005)

[9] Ryner M, Stridsberg K, Albertsson AC, von Schenck H, Svensson M, Macromolecules, 34(12), 3877 (2001)

[10] Stolt M, Sodergard A, Macromolecules, 32(20), 6412 (1999)

[11] Kricheldorf HR, Chemosphere., 43, 49 (2001)

[12] Baran J, Duda A, Kowalski A, Szymanski R, Penczek S, Macromol. Symp., 123, 93 (1997)

[13] Simic V, Spassky N, Hubertpfalzgraf LG, Macromolecules, 30(23), 7338 (1997)

[14] Stevels WM, Ankone MJK, Dijkstra PJ, Feijen J, Macromol. Chem. Phys., 196, 1153 (1995)

[15] Ikada Y, Jamshidi K, Tsuji H, Hyon SH, Macromolecules., 20, 904 (1987)

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[18] Nijenhuis AJ, Grijpma DW, Pennings AJ, Macromolecules., 25, 6419 (1992)

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[23] Hyon SH, Jamshidi K, Ikada Y, Biomaterials., 18, 1503 (1997)

[24] Park JW, Kim SH, Park SY, Lee YW, Kim YH, Macromol. Biosci., 4, 340 (2004)