유화중합에 의한 Starch-<i>g</i>-PMMA 공중합물의 합성

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Polymer(Korea), Vol.22, No.4, 570-578, July, 1998

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유화중합에 의한 Starch-g-PMMA 공중합물의 합성

Preparation of Starch-g-PMMA Copolymer by Emulsion Polymerization

이기호, 조창기

초록

개시제로 potassium persulfate(KPS), 유화제로 sodium dodecylbenzenesulfonate(SDBS), 연쇄이동제로 tetraethylthiuram disulfide(TETDS)를 사용한 유화중합에 의하여 전분에 메틸메타크릴레이트를 그라프트시켰으며, 중합시간, 개시제, 유화제, 분자량 조절제, 전처리와 후처리 등의 여러 가지 인자에 의한 영향을 조사하였다. 중합시간과 유화제 양의 증가에 따라 graft percent(GP)가 증가되었으며 TETDS양의 증가에 따라 대체적인 GP의 감소가 관찰되었다. 또 반응전 팽윤 처리된 전분과 중합반응 후 90℃로 후처리된 전분의 경우는 처리하지 않은 경우에 비해서 높은 GP 값을 나타내었다. 전분에 그라프트된 폴리메틸메타크릴레이트(PMMA)의 분자량은 GP 값의 변동과 관계가 있는 것으로 관찰되었다. 전분의 입자크기는 전처리 또는 후처리에 의하여 작아지는 것이 관찰되었다.

Methyl methacrylate was graft copolymerized onto native corn starch by emulsion polymerization, using potassium persulfate (KPS) as an initiator, sodium dodecylbenzenesulfonate (SDBS) as an emulsifier, and tetraethylthiuram disulfide (TETDS) as a chain transfer agent. As the reaction time and the emulsifier concentration increased, graft percent (GP) was increased. With the increase of chain transfer agent concentration, GP was decreased. When the corn starch was pre-swelled with water, or when the reaction mixture was post-aged at 90 ℃, higher GP values were obtained. The molecular weight of the grafted poly(methyl methacrylate) (PMMA) showed a certain relationship with the variation of GP. The granular size of the starch was reduced by the pre-swelling or by the post-aging.

Keywords:Corn starch;Methyl methacrylate;Emulsion polymerization;Graft copolymer

[References]

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[2] Kim YW, Cho WY, Cho DM, Polym. Sci. Technol., 5(1), 19 (1994)

[3] Whistler RL, "Starch: Chemistry and Technology," Academic Press, New York (1984)

[4] French D, J. Animal Sci., 37, 4 (1973)

[5] Lelievere J, Polymer, 17, 854 (1976)

[6] Jones EJ, Morgan LB, Roberts JFL, Todd SM, Br. Patent, 715,194 (1954)

[7] Kargin VA, Koslov PV, Plate NA, Konoreva II, Vysokomol. Soedin., 1, 114 (1959)

[8] Kargin VA, Plate NA, Reibinder EP, Vysokomol. Soedin., 1, 1547 (1959)

[9] Mino G, Kaizerman S, J. Polym. Sci., 31, 242 (1958)

[10] Kimura S, Takitani T, Imoto M, Bull. Chem. Soc. Jpn., 35, 2012 (1962)

[11] Cho CG, Lee KH, Woo SW, Choi JB, Hwang SS, J. Korean Ind. Eng. Chem., 8(5), 866 (1997)

[12] Lim S, Jane J, Rajagopalan S, Seib PA, Biotechnol. Prog., 8, 51 (1992)

[13] Fanta GF, "Block and Graft Copolymerization," R.J. Ceresa, Ed., vol. 1, Wiley-Interscience, New York (1973)

[14] Fanta GF, Burr RC, Doane WM, Russell CR, J. Appl. Polym. Sci., 15, 2651 (1971)

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[16] Liu M, Cheng R, Wu J, Ma C, J. Polym. Sci. A: Polym. Chem., 31, 3181 (1993)

[17] Gardon JL, "Emulsion Polymerization," C.E. Schildknecht, ed., Wiley-Interscience, New York (1982)

[18] Mehrotra R, Ranby B, J. Appl. Polym. Sci., 22, 3003 (1978)

[19] Bazuaye A, Okieimen FE, Said OB, J. Polym. Sci. C: Polym. Lett., 27, 433 (1989)

[20] Mehrotra R, Ranby B, J. Appl. Polym. Sci., 22, 2991 (1978)