선형/폴리락틱산/스타형 폴리락틱산 블렌드의 열적 특성 변화에 대한 연구

천상욱; 김수현; 김영하; 강호종; Sang-Wook Chun; Soo Hyun Kim; Young Ha Kim; Ho-Jong Kang

Polymer(Korea), Vol.24, No.3, 333-341, May, 2000

Export Citation

선형/폴리락틱산/스타형 폴리락틱산 블렌드의 열적 특성 변화에 대한 연구

Thermal Properties of Linear Shape Polylactic Acid/Star Shape Polylactic Acid Blends

천상욱, 김수현 ¹, 김영하¹, 강호종 ^{2, †}

단국대학교 화학공학과
¹한국과학기술연구원 생체재료연구센터
²기능성 고분자 신소재 연구센터, 단국대학교 고분자공학과

Sang-Wook Chun, Soo Hyun Kim¹, Young Ha Kim¹, and Ho-Jong Kang^{2, †}

Center for Advanced Functional Polymers, Dankook University, #8 Hannam-dong, Yongsan-ku, Seoul 140-714, Korea
¹Biomaterials Research Center, Korea Institute of Science and Technology, Seoul, Korea
²Dept. of Chemical Engienering, Dept. of Polymer Sci. and Eng., Dankook University, #8 Hannam-dong, Yongsan-ku, Seoul 140-714, Korea

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초록

선형 폴리락틴산/스타형 폴리락틱산 블렌드를 용융 및 용액 블렌딩에 의해 제조하여 이들의 열적 특성 및 결정화 거동을 살펴보고 블렌딩 방법이 이들에 미치는 영향을 살펴보았다. 분지형 구조를 갖는 스타형 폴리락틱산은 선형 폴리락틱산에 비하여 용융 및 용액 가공에서의 분자량 감소가 적음을 확인하였으며, 용융 가공에 비하여 용액 가공에서 분자량 분포가 넓어짐을 확인하였다. 스타형 폴리락틱산을 선형 폴리락틱산에 블렌딩하였을 경우 용융온도의 감소와 유리전이온도의 감소를 확인하였으며, 용액 블렌딩에 의하여 얻어진 블렌드는 용융 블렌딩에 의하여 얻어진 블렌드에 비하여 낮은 유리전이온도를 갖음을 알 수 있었다. 분지형 구조로 인하여 상대적으로 결정화가 어려운 스타형 폴리락틱산과 스타형 폴리락틱산 함량이 높은 블렌드의 경우, 용액 가공에 의하여 용융 가공에서 보다 높은 결정화도를 얻을 수 있었다.

Blends consisting of linear shape polylactic acid and star shape polylactic acid (L-PLLA/S-PLLA) have been prepared by melt and solution blending. The effect of blending method on the thermal properties and crystallization behavior of L-PLLA/S-PLLA blends has been investigated. The molecular weight decrease was revealed both in melt and solution blending. S-PLLA was found to be more stable than L-PLLA in the reduction of molecular weight during the course of blending due to its star shape structure. As a result, broad molecular weight distribution was obtained in solution blending. It was found that melting temperature and glass transition temperature decrease with increasing S-PLLA content. Blending method had large influence on the glass transition temperature of PLLA blends, while less effect on melting temperature. From DSC results, it can be noticed that solution blending is more effective blending method to obtain higher crystallinity than melt blending for S-PLLA and blend with higher S-PLLA content.

Keywords:Linear-polylactic acid;Star-polylactic acid;Solution blending;Melt blending;Thermal properties;Crystallization

[References]

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Kulkarni RK, Pani KC, Neuman C, Leonard F, Arch. Surg., 93, 839 (1966)
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Vert M, Angew. Makromol. Chem., 155, 166 (1989)
Jamshidi K, Hyon SH, Ikada Y, Polymer, 29, 2229 (1988)
Matsusue Y, Yamamuro T, Yoshii S, Oka M, Ikada Y, Hyon SH, Shikinami Y, J. Appl. Biomater., 2, 1 (1991)
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Kim SH, Han Y, Kim YH, Hong SI, Makromol. Chem., 193, 1623 (1992)
Schindler A, Haper D, J. Polym. Sci. A-Polym. Chem., 17, 2593 (1979)
Mark JE, Eisenberg A, "Physical Properties of Polymer," p. 149, American Chemical Society, Washington DC, 1993 (1993)
Chun S, "Master Thesis," Dankook Univ., 1996 (1996)

[Referenced By]

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[1] Fisher EW, Sterzel HJ, Wegner G, Kolloid Z. Z. Polym., 251, 980 (1973)

[2] Cha Y, Pitt CG, Biomaterials, 11, 108 (1990)

[3] Kulkarni RK, Pani KC, Neuman C, Leonard F, Arch. Surg., 93, 839 (1966)

[4] Migliaresi C, Fambri L, Cohn D, J. Biomater. Sci.-Polym. Ed., 5, 591 (1994)

[5] Vert M, Li SM, Garreau H, J. Control. Release, 16, 15 (1991)

[6] Schneider B, Canadian Patent 863673 (1971)

[7] Schneider B, U.S. Patent, 3,636,956 (1972)

[8] Lipinsky ES, Sinclair RG, Chem. Eng. Prog., 82, 26 (1986)

[9] Vert M, Angew. Makromol. Chem., 155, 166 (1989)

[10] Jamshidi K, Hyon SH, Ikada Y, Polymer, 29, 2229 (1988)

[11] Matsusue Y, Yamamuro T, Yoshii S, Oka M, Ikada Y, Hyon SH, Shikinami Y, J. Appl. Biomater., 2, 1 (1991)

[12] Adroampm KP, Pohjonen T, Tormala P, J. Appl. Biomater., 5, 133 (1994)

[13] Hoffman AS, J. Appl. Polym. Sci. Appl. Polym. Symp., 31, 313 (1977)

[14] Alexander H, Langrana N, Massengill JB, Weiss AB, J. Biomech., 14, 377 (1981)

[15] Huang SJ, Edelman PG, Cameron JA, "Adv. in Biomed. Polymers," p. 101, Plenum, New York, 1987 (1987)

[16] Tsuji H, Horii F, Hyon SH, Ikada Y, Macromolecules, 24, 2719 (1991)

[17] Tsuji H, Ikada Y, J. Appl. Polym. Sci., 53(8), 1061 (1994)

[18] Kim SH, Han YK, Ahn KD, Kim YH, Chang T, Makromol. Chem., 194, 3229 (1993)

[19] Kim SH, Han Y, Kim YH, Hong SI, Makromol. Chem., 193, 1623 (1992)

[20] Schindler A, Haper D, J. Polym. Sci. A-Polym. Chem., 17, 2593 (1979)

[21] Mark JE, Eisenberg A, "Physical Properties of Polymer," p. 149, American Chemical Society, Washington DC, 1993 (1993)

[22] Chun S, "Master Thesis," Dankook Univ., 1996 (1996)