아크릴레이트 공중합체 기반 열 계면 소재의 열전달 물성 향상

최화춘; 김형일; Hwa-Choon Choi; Hyung-Il Kim

Polymer(Korea), Vol.43, No.5, 756-763, September, 2019

DOI10.7317/pk.2019.43.5.756 Export Citation

아크릴레이트 공중합체 기반 열 계면 소재의 열전달 물성 향상

Improvement of Heat Transfer Properties Using Acrylate Copolymers as Thermal Interface Materials

최화춘, 김형일^†

충남대학교 공과대학 공업화학과

Hwa-Choon Choi, and Hyung-Il Kim^†

Department of Industrial Chemistry, College of Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea

E-mail:

초록

다양한 아크릴레이트 단량체 조성으로 아크릴레이트계 공중합체를 합성하였으며 친유성 또는 친수성 특성에 따른 열 계면 소재로서의 적합성을 조사하였다. 아크릴레이트 공중합체들을 균일한 두께의 코팅층으로 제조하여 열전달 온도, 접촉각, 점착력, 반사율, 유연성 및 경도 등의 열 방출 특성에 관련된 물성의 변화를 조사하였다. t-butyl methacrylate(t-BMA)를 함유한 유용성 공중합체는 다른 공중합체들보다 높은 경도 및 접촉각을 나타냈지만 열전달 효과는 낮게 나타났다. 반면, 수용성 공중합체들은 대체적으로 우수한 열전달 효과를 나타내었다. Methyl methacrylate (MMA) 함량 7.5%와 2-hydroxyethyl methacrylate(HEMA) 함량 32.5%의 조성비로 합성된 poly(MAA-co-BMA-co-lauryl methacrylate(LMA)-co-HEMA)가 가장 우수한 열전달 효과를 나타내었다. 또한 이러한 수용성 공중합체를 열 계면 소재로 사용했을 때 높은 접촉각과 낮은 Tg에 의해 소수성 알루미늄 접착 표면(접촉각 85.3o)에서의 젖음 특성이 우수하여 알루미늄 표면과 열 계면 소재 표면 사이의 공극을 대부분 제거할 뿐만 아니라 다양한 표면 형상에도 적용하기 적합한 특성을 나타내었다.

Acrylate copolymers were synthesized using various compositions of acrylate monomers and their suitability as thermal interface material was investigated with regard to oil-soluble and water-soluble characteristics. Acrylate copolymers, which were prepared as coating layer with uniform thickness, were investigated in terms of heat releasing properties such as heat transfer temperature, contact angle, adhesion force, reflectivity, and hardness. The oil soluble copolymers containing t-butyl methacrylate (t-BMA) showed poor heat transfer properties in spite of higher hardness and contact angle. On the other hand, water soluble copolymers showed excellent heat transfer properties. Among water soluble copolymers, poly(MAA-co-BMA-co-lauryl methacrylate (LMA)-co-HEMA) synthesized with methyl methacrylate (MMA) content of 7.5% and 2-hydroxyethyl methacrylate (HEMA) content of 32.5% showed not only the best heat transfer properties but also excellent physical properties such as high contact angle and low Tg for self-spreading on hydrophobic aluminum substrate surface (contact angle 85.3o) resulting in both efficient removal of void at interface between aluminum and thermal interface material and wide applicability on various surface shapes.

Keywords:thermal interface material;heat transfer;oil soluble acrylate copolymers;water soluble acrylate copolymers

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Huh W, Lee SW, Park HJ, Kim JY, Hong YS, Yoo KP, Polym. Korea, 28(6), 445 (2004)
Hong JH, Shim SE, Chem. Eng., 21, 115 (2010)
You R, Lee SH, Park WH, J. Kor. Fiber Soc., 52, 431 (2015)
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[1] Zhang C, Maric M, Polymers, 3, 1398 (2011)

[2] Jung JH, Korea Patent WO2013094801A1 (2013).

[3] Park HY, Korea Patent WO2011090236A1 (2011).

[4] Ghim D, Kim JH, Korean J. Chem. Eng., 33(2), 707 (2016)

[5] Bae YH, Park GD, Jung HO, Vu MC, Kim SR, Polym. Korea, 40(1), 148 (2016)

[6] Kim JK, Kim JW, Kim MI, Song MS, Macromol. Res., 14(5), 517 (2006)

[7] Jeong NH, Park YJ, Lee HW, Nam KD, J. Kor. Oil Chem. Soc., 17, 262 (2000)

[8] Lopez BL, Murillo E, Hess M, E-Polymers, 4, 028 (2004)

[9] Kim PS, Lee WK, J. Adhes. Int., 17, 56 (2016)

[10] Baek SS, Jang SJ, Lee JH, Kho DH, Lee SH, Hwang SH, Polym. Korea, 38(2), 199 (2014)

[11] Kim JH, Kim MS, Hong SC, Kim BW, J. Kor. Chem. Eng., 49, 62 (2011)

[12] Butt HJ, Cappella B, Kappl M, Surf. Sci. Rep., 59, 1 (2005)

[13] Vakrilov N, Stoynova A, Electrical and Electronics Engineering: An International Journal (ELELIJ), 4, 1 (2015).

[14] Kim BH, Lee HS, J. Korea Concrete Institute, 23, 521 (2011)

[15] Hoessel P, Riemann S, Knebl R, Schroeder J, Schuh G, Castillo C, J. Cosmet. Sci., 61, 343 (2010)

[16] Baltenneck F, Franbourg A, Leroy M, Vayssie C, J. Cosmet. Sci., 52, 355 (2001)

[17] Wu SH, J. Phys. Chem., 74, 632 (1970)

[18] Li JW, Oh KH, Yu H, Chinese J. Polym. Sci., 23, 187 (2005)

[19] Grabowska B, Holtzer M, Arch. Metall. Mater., 54, 427 (2009)

[20] Huh W, Lee SW, Park HJ, Kim JY, Hong YS, Yoo KP, Polym. Korea, 28(6), 445 (2004)

[21] Hong JH, Shim SE, Chem. Eng., 21, 115 (2010)

[22] You R, Lee SH, Park WH, J. Kor. Fiber Soc., 52, 431 (2015)

[23] Lee SH, Cheon JM, Jeong BY, Kim HD, Chun JH, J. Adhes. Int., 16, 156 (2015)

[24] Kim JW, Lee DC, Choi JS, Kor. Chem. Eng. Res., 55, 579 (2017)

[25] Oh JH, Kang S, Xiangxu L, No SR, You SS, Cho UR, Polym. Korea, 40(5), 722 (2016)