Abstract
The molecular weight and thermal properties of unfractionated by-product polyolefin wax (wax K) from a naphtha cracking unit, fractionated commercial paraffin wax (wax J) and their blend (wax M) were evaluated and were compared with each other using differential scanning calorimetry (DSC), normal and high-temperature gel permeation chromatography (GPC), and wide-angle X-ray diffraction (WAXD). Such properties as molecular weight distribution, melting temperature and degree of crystallization were altered by blending wax K with wax J. By blending with two parts of wax K and one part of wax J to prepare wax M, M w of wax K was shifted, by half, to that of wax J in order to approach that of wax M, whereas the M n of wax K remains almost unaltered to become that of wax M. In particular the effect of blending of wax K and wax J turned out co-crystallization for the sharper lower-melting-temperature endothermic peak of the blend, indicating narrower molecular distribution, than that of wax K at the melting temperature shifted even below that of wax J. The total degree of crystallinity for the blend, wax M, turns out less than that before blending wax K with wax J, which may be attributed to the effect of co-crystallization due to blending.
Similar content being viewed by others
References
T. Wu, Y. Li and G. Wu, Polymer, 46, 3472 (2005).
I. Krupa and A. S. Luyt, Polym. Deg. Stab., 70, 111 (2000).
T. N. Mtshali, I. Krupa and A. S. Luyt, Thermochimica Acta., 380, 47 (2001).
C. A. Fonseca and I. R. Harrison, Thermochimica Acta., 313, 37 (1998).
J. G. Gao, M. S. Yu and Z. T. Li, European Polymer Journal, 40, 1533 (2004).
H. S. Ashbaugh, A. Radulescu, R. K. Prud’homme, D. Schwahn, D. Richter and L. J. Fetters, Macromolecules, 35, 7044 (2002).
A. Radulescu, D. Schwahn, D. Richter and L. J. Fetters, J. Appl. Crystal., 36, 995 (2003).
A. Radulescu, D. Schwahn, M. Monkenbusch, D. Richter and L. J. Fetters, Physica B. Condensed Matter, 350, e927 (2004).
S. P. Hlangothi, I. Krupa, V. Djokovi and A. S. Luyt, Polym. Deg. Stab., 79, 53 (2003).
I. Krupa and A. S. Luyt, Polym. Deg. Stab., 73, 157 (2001).
I. Krupa and A. S. Luyt, Polymer, 42, 7285 (2001).
A. N. Wilkinson, S. B. Tattum and A. J. Ryan, Polymer, 38, 1923 (1997).
A. F. Regin, S. C. Solanki and J. S. Saini, Renew. Energy, 31, 2025 (2006).
A. Sharma, S. D. Sharma and D. Buddhi, Energy Conversion and Management, 43, 1923 (2002).
S. L. Rosen, Fundamental principles of polymeric materials (2 nd Ed.), John Wiley & Sons, Inc., Singapore (1993).
J. Chatterjee, Y. Haik and C. J. Chen, J. Mag. Mag. Mater., 246, 382 (2002).
T. Ozawa, Polymer, 12, 150 (1971).
P. S. Umare, R. Antony, K. Gopalakrishnan, G. L. Tembe and B. Trivedi, J. Molecul. Catal. A: Chem., 242, 141 (2005).
A. J. Ryan, J. L. Stanford, W. B. Thomas and M. W. Nye, Polymer, 38, 759 (1997).
D. W. Van Krevelen and P. J. Hoftyzer, Properties of polymers: Their estimation and correlation with chemical structure (2 nd Ed.), Elsevier Scientific Publishing Company, Amsterdam (1976).
J. K. Kim and B. K. Kim, J. Jpn. Soc. Powder/Powder Metall., 46, 823 (1999).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lee, E.J., Park, J.K., Lee, YS. et al. Comparison of thermal properties of crude by-product polyolefin wax, fractionated paraffin wax and their blend. Korean J. Chem. Eng. 27, 524–530 (2010). https://doi.org/10.1007/s11814-010-0113-y
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11814-010-0113-y