PE 필름에 첨가되는 계면활성제의 이동

이강석; 조규철; 박인하; 최순자

Polymer(Korea), Vol.21, No.6, 981-990, November, 1997

Export Citation

PE 필름에 첨가되는 계면활성제의 이동

Electrical Properties of Acrylic Acid Grafted Polyethylene

이강석, 조규철, 박인하, 최순자

초록

농업용 필름으로 사용되는 플리에틸렌 블렌드에 첨가된 계면활성제의 확산거동을 FT-IR(courier transform infrared) 분광기법에 의해 측정하였다. 본 연구에 사용된 시스템은 LLDPE(linear low density polyethylene)와 LDPE(low density polyethylene)의 블렌드로 LLDPE : LDPE=7 : 3에 계면촬성제(sorbitan palmitate : SPAN-40)를 첨가한 시료와 계면활성제의 확산 거동을 조절하는 EAA(ethylene acrylic acid)코폴리머를 첨가한 시료이다. 본 연구 결과 FT-IR 기법에 의해 LLDPE 블렌드 내에 흔입된 계면활성제의 이동 현상은 non-Fickian으로 관찰되었으며, 또한 계면활성제의 탈착을 조절하기 위해 범가된 EAA가 시스템 내부에 흡입된 계면활성제의 이동 속도를 감소시킴이 성공적으로 관찰되었다. 이는 migration controller로 사용된 EAA가 준결정성 고분자로서 전체 결정도를 증가시킴에 따라 저분자 물질이 확산될 수 있는 자유부피를 감소시킴으로 일어나는 현상으로 추측된다.

Fourier transform infrared (FT-IR) spectroscopy technique is conformed to be useful to investigate the diffusion behaviour of surfactant in polyethylene films which have been used for agricultural application. Polyethylene blends whose composition of LLDPE(linear low density polyethylene) to LDPE(low density polyethylene) is 7 : 3, surfactant(sorbitan palmitate:SPAN-40) and poly(ethylene acrylic acid : EAA)copolymer which was used for migration controller have been used for this study. Experimental results presented here demonstrate that the migration of surfactant in LLDPE blends is non-Fickian and that EAA has successfully reduced the migration rate of the surfactant in the system. This may be arised from the increased crystallinity due to the EAA which reduces the free volume of the amorphous region in LLDPE blends.

Keywords:Fourier transform infrared;diffusion behaviour;migration controller;surfactant;non-Fickian;LLDPE

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[1] Lee H, Choe S, Polym.(Korea), 18(3), 338 (1994)

[2] Vrentas JS, Duda JL, Lau MK, J. Appl. Polym. Sci., 27, 3987 (1982)

[3] Vrentas JS, Duda JL, J. Polym. Sci. B: Polym. Phys., 15, 403 (1977)

[4] Vrentas JS, Duda JL, J. Polym. Sci. B: Polym. Phys., 15, 417 (1977)

[5] Fujita H, Fortschr. Hochpolym. Forsch., 3, 1 (1961)

[6] Cohen MH, Turnbull D, J. Chem. Phys., 31, 1164 (1959)

[7] Zielinski JM, Duda JL, AIChE J., 38, 405 (1992)

[8] Comyn J, "Polymer Permeability," Ed. by J. Comyn, Elsevier Applied Science, New York (1985)

[9] Crank J, Park GS, "Diffusion in Polymers," Academic, New York (1968)

[10] Fieldson GT, Barbari TA, Polymer, 34, 1146 (1993)

[11] Harrick NJ, "Internal Reflection Spectroscopy," Interscience Publishers, New York (1967)

[12] Xu JR, Balik CM, Appl. Spect., 42, 1543 (1988)

[13] Jan FR, "Experimental Methods in Polymer Chemistry," Interscience Publishers, New York (1980)