Abstract
The experimental observations about remarkable influence of the substrates on the isothermal crystallization rate of a high density polyethylene(HDPE) were presented. Two methods were used to characterize the crystallization rate: the change of turbidity of the HDPE specimen and the changes of the complex viscosity and storage modulus measured by a rotational rheometer, which gave consistent results showing that the isothermal crystallization rate decreased in sequence as the specimen contacted with aluminum, brass and stainless steel plates, respectively. As to the dominant influence factor, the chemical composition of the substrates can be excluded via insulating the plate by an aluminum foil. Instead, we propose the plate’s ability of removing the latent heat of crystallization from the specimen. Rheological measurement is sensitive to the crystallization process. The colloid like model proposed by BOUTAHAR et al for the crystallization of HDPE gives reasonable predictions of the crystallized fraction from the measured storage modulus.
Similar content being viewed by others
References
BOUTAHAR K, CARROT C, GUILLET J. Crystallization of polyolefins from rheological measurements relation between the transformed fraction and the dynamic moduli [J]. Macromolecules, 1998, 31: 1921–1929.
POGODINA N V, WINTER H H. Polypropylene crystallization as a physical gelation process [J]. Macromolecules, 1998, 31: 8164–8172.
CHEN Q, FAN YR, ZHENG Q. A novel approach to rheological characterization for the gelation in polymer crystallization [J]. Chin J Polym Sci, 2005, 23(4): 423–434.
KOSCHER E, FULCHIRON R. Influence of shear on polypropylene crystallization: Morphology development and kinetics [J]. Polymer, 2002, 43: 6931–6942.
HADINATA C, GABRIEL C, RUELLMAN M, LAUN H M. Comparison of shear-induced crystallization behavior of PB-1 samples with different molecular weight distribution [J]. J Rheol, 2005, 49: 327–349.
CHEN Q, FAN Y R, ZHENG Q. Rheological scaling and modeling of shear-enhanced crystallization rate of polypropylene [J]. Rheol Acta, 2006, 46: 305–316.
VLEESHOUWERS S, MEIJER H E H. A rheological study of shear induced crystallization [J]. Rheol Acta, 1996, 35: 391–399.
COPPOLA S, GRIZZUTI H. Microrheological modelling of flow-induced crystallization [J]. Macromolecules, 2001, 34: 5030–5036.
JANESCHITZ-KRIEGL H, RATAJSKI E. Kinetics of polymer crystallization under processing conditions: Transformation of dormant nuclei by the action of flow [J]. Polymer, 2005, 46: 3856–3870.
LIAO H Y, LIN Y, FAN Y R. Rheological properties of high-density polyethylene in isothermal crystallization [J]. J Chemical Industry and Engineering, 2007, 58: 2500–2505. (in Chinese)
SCHULTZ J. Polymer materials science [M]. Prentice-Hall Inc, 1974.
STROBL G. The physics of polymers (2nd edition) [M]. Berlin: Springer-Verlag, 1997.
Author information
Authors and Affiliations
Corresponding author
Additional information
Foundation item: Project(20050335050) supported by the Special Foundation of Education Ministry of China; Project(10472105) supported by the National Natural Science Foundation of China
Rights and permissions
About this article
Cite this article
Fan, Yr., Lin, Y. & Ruan, Mz. Effect of substrates on crystallization of high density polyethylene. J. Cent. South Univ. Technol. 15 (Suppl 1), 67–71 (2008). https://doi.org/10.1007/s11771-008-0316-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11771-008-0316-0