Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Effect of the Starch Content on the Silicate Dispersion and Rheological Properties of Polypropylene/Starch/Silicate Composites

폴리프로필렌/전분/실리케이트 복합체의 실리케이트 분산 및 유변학적특성에 미치는 전분 함량의 영향

  • Kim, Youn Cheol (Major in Polymer Engineering, Kongju National University) ;
  • Lee, Chang-Young (Department of Environmental Engineering, Kongju National University)
  • 김연철 (공주대학교 고분자공학전공) ;
  • 이창용 (공주대학교 환경공학과)
  • Received : 2007.09.27
  • Accepted : 2007.10.18
  • Published : 2008.02.28
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Abstract

Polypropylene (PP)/corn starch master batch (starch-MB)/silicate composites with different corn starch compositions of 10, 20, 30, 40 and 50 were prepared by melt compounding at $200^{\circ}C$, using lab scale Brabender mixer. The content of silicate was fixed at 5 wt%. The composition of starch-MB in composites was confirmed by the existence of hydroxy group and peak intensity in fourier-transform-infrared (FT-IR) spectrum. The thermal properties of the PP/starch-MB/silicate composites were investigated by differential scanning calorimetry (DSC), and thermogravimetric analyzer (TGA). There was no district change in melting temperature, and TGA curve indicates a decrease in degradation temperature with the increase of starch-MB content. The silicate dispersion of the composites was measured by X-ray diffraction (XRD) and transmission electron microscope (TEM). The degree of silicate dispersion in PP/starch-MB/silicate composites depended on the content of starch-MB. There was detectable change in d-spacing and peak intensity of the composite when the content of starch-MB was higher than 20 wt%. The rheological behavior of the composites was explained by both shear thinning effect and elastic property with the starch-MB amount. These effects were remarkable when the content of starch-MB was higher than 20 wt%. These were confirmed by an oscillatory viscometer at $200^{\circ}C$.

폴리프로필렌(polypropylene, PP)/옥수수전분(corn starch) 마스터뱃취(MB)/실리케이트 복합체를 전분 함량을 10, 20, 30, 40, 50으로 변화시키면서 실험실 규모의 brabender mixer를 이용하여 $200^{\circ}C$에서 제조하였다. 실리케이트의 함량은 5 wt%로 고정하였다. 복합체에서 전분 MB 함량 변화는 적외선분광기(FT-IR)를 이용하여 수산기의 존재여부와 피크 강도 변화로 확인하였다. PP/전분 MB/실리케이트 복합체의 열적특성을 시차주사열용량분석기(DSC) 그리고 열중량분석기(TGA)를 이용하여 관찰하였다. PP/전분 MB/실리케이트의 용융온도에는 큰 변화가 나타나지 않음을 알 수 있었고, 분해온도는 전분 MB 함량에 따라 점차적으로 감소하는 경향을 보여주었다. 복합체의 실리케이트 분산정도는 X-선 회절(XRD)과 투과전자현미경(TEM)을 이용하여 측정하였다. 복합체의 실리케이트 분산은 전분 MB의 함량에 의존하였고, 전분 MB가 20 wt% 이상 첨가되었을 때 d-spacing과 피이크 강도에 큰 변화를 보였다. 복합체의 유변학적 특성은 전분 MB의 함량에 따라 shear thinning effect와 탄성특성에 있어 증가를 나타내었다. 또한 전분 함량이 20 wt% 이상 첨가되었을 때 이들 유변학적 특성에 있어서 큰 변화를 나타내었다. 이는 $200^{\circ}C$에서 동적유변학측정기를 이용하여 확인하였다.

Keywords

References

  1. Heinemann, J., Reichert, P., Thomann, R. and Mulhaupt, R., "Polyolefin Nanocomoposites Formed by Melt Compounding and Transition Metal Catalyzed Ethene Homo- and Copolymerization in the Presence of Layered Silicates", Macro. Rapid Commun., 20(8), 423-430(1999). https://doi.org/10.1002/(SICI)1521-3927(19990801)20:8<423::AID-MARC423>3.0.CO;2-N
  2. Zheng, L., Farris, R. J. and Coughlin, E. B., "Novel Polyofefin Nanocomposites: Synthesis and Characterizations of Metallocenecatalyzed Polyolefin Polyhedral Oligomeric Silsesquioxane Copolymers," Macromolecules, 34(23), 8034-8039(2001). https://doi.org/10.1021/ma0110094
  3. Nam, P. H., Maiti, P., Okamoto, M., Kotaka, T., Hasegawa, N. and Usuki, A., "A Hierarchical Structure and Properties of Intercalated Polypropylene/clay Nanocomposites," Polymer, 42, 9633- 9640(2001). https://doi.org/10.1016/S0032-3861(01)00512-2
  4. Liu, X. and Wu, Q., "PP/clay Nanocomposites Prepared By Grafting-melt Intercalation," Polymer, 42, 10013-10019(2001). https://doi.org/10.1016/S0032-3861(01)00561-4
  5. Wang, K. H., Choi, M. H., Koo, C. M., Choi, Y. S. and Chung, I. J., "Synthesis and Characterization of Maleated Polyethylene/ clay Nanocomposites," Polymer, 42, 9819-9826(2001). https://doi.org/10.1016/S0032-3861(01)00509-2
  6. Li, J., Zhou, C. and Gang, W., "Study on Nonisothermal Crystallization of Maleic Anhydride Grafted Polypropylene/montmorillonite Nanocomposite," Polym. Test., 22, 217-223(2003). https://doi.org/10.1016/S0142-9418(02)00085-5
  7. Kim, Y. C., "Effect of Maleated Polyethylene on the Crystallization Behavior of LLDPE/clay Nanocomposites," Polym. J., 38(3), 250-257(2006). https://doi.org/10.1295/polymj.38.250
  8. Chung, M. S., Lee, W. H., You, Y. S., Kim, H. Y., Park, K. M. and Lee, S. Y., "Assessment and Applications of Multi-degradable Polyethylene Films as Packaging Materials," Food Sci. Biotech., 15(1), 5-12(2006).
  9. Barikani, M. and Mohammadi, M., "Synthesis and Characterization of Starch-modified Polyurethane," Carbohydrate Polymers, 68, 773-780(2007). https://doi.org/10.1016/j.carbpol.2006.08.017
  10. Lim, D. L. and Im, S. S., "Biodegradable Polyolefin Composites Containing Starches", J. Korean Ind. & Eng. Chem., 3(3), 361-370 (1992).
  11. Lee, S. H., Kim, D. J., Kim, J. H., Lee, D. H., Sim, S. J., Nam, J. D., Kye, H. S. and Lee, Y. K., "Compatibilization and Properties of Modified Starch-Poly(latic acid) Blend," Polymer(Korea), 28(6), 519-523(2004).
  12. Jang, W. Y., Shin, B. Y., Lee, T. J. and Narayan, R., "Thermal Properties and Morphology of Biodegradable PLA/Starch Compatibilized Blends," J. Ind. Eng. Chem., 13(3), 457-464(2007).
  13. Baker, W. E., Rudin, A., Schreiber, H. P. and El-Kindi, M., "The Effect of Processing on Rheological and Molecular Characteristics of a Low Density Polyethylene", Polym. Eng. Sci., 33(7), 377- 382(1993). https://doi.org/10.1002/pen.760330702
  14. Molenaar, J. and Koopmans, R. J., "Modeling Polymer Melt-flow Instabilities," J. Rheol., 38(1), 99-109(1994). https://doi.org/10.1122/1.550603
  15. Wange, S. Q. and Drda, P. A., "Superfluid-Like Stick-Slip Transition in Capillary Flow of Linear Polyethylene Melts," Macromolecules, 29(7), 2627-2632(1996). https://doi.org/10.1021/ma950898q
  16. Lele, A., Mackley, M. and Galgali, G. and Ramesh, C., "In Situ Rheo-x-ray Investigation of Flow-induced Orientation in Layered Silicate-syndiotatic Polypropylene Nanocomposite Melt, " J. Rheol., 46(5), 1091-1110(2002). https://doi.org/10.1122/1.1498284
  17. Kim, Y. C., Lee, S. J., Kim, J. C. and Cho, H., "Effects of Maleated Polyethylene on the Rheological Properties of LLDPE/Clay Nanocomposites," Polym. J., 37(3), 206-211(2005). https://doi.org/10.1295/polymj.37.206