Abstract
In this study, α-phase nucleating agent (NA) 1,3:2,4-bis(3,4-dimethylbenzylidene) sorbitol (DMDBS), β-phase rare earth NA (WBG), and their compound NAs were introduced into isotactic polypropylene (iPP) matrix, respectively. Crystallization kinetics and subsequent melting behavior of the nucleated iPPs were comparatively studied by differential scanning calorimetry (DSC) under both isothermal and nonisothermal conditions. For the isothermal crystallization process, it is found that the Avrami model successfully described the crystallization kinetics. The active energy of nonisothermal crystallization of iPP was determined by the Kissinger method and showed that the addition of nucleating agents increased the activation energy. Melting behavior and crystalline structure of the nucleated iPPs are dependent on the nature of NAs and crystallization conditions. Higher proportion of β-phase can be obtained at higher content of β-nucleating agent and lower crystallization temperature or lower cooling rate.
Similar content being viewed by others
References
Varga J. Supermolecular structure of isotactic polypropylene—review. J Mater Sci. 1992;27:2557–79.
Varga J. β-Modification of isotactic polypropylene: preparation, structure, processing, properties, and application. J Macromol Sci: Phys. 2002;41B:1121–71.
Libster D, Aserin A, Garti N. Advanced nucleating agents for polypropylene. Polym Adv Technol. 2007;18:685–95.
Nagarajan K, Levon K, Myerson AS. Nucleating agents in polypropylene. J Therm Anal Calorim. 2000;59:497–508.
Kristiansen M, Werner M, Tervoort T. The binary system isotactic polypropylene/bis(3,4-dimethylbenzylidene)sorbitol: phase behavior, nucleation, and optical properties. Macromolecules. 2003;36:5150–6.
Blomenhofer M, Ganzleben S, Hanft D. “Designer” nucleating agents for polypropylene. Macromolecules. 2005;38:3688–95.
Varga J, Menyhárd A. Effect of solubility and nucleating duality of N′N″-dicyclohexyl-2, 6-naphthalene-dicarboxamide on the supermolecular structure of isotactic polypropylene. Macromolecules. 2007;40:2422–31.
Zhang YF, Xin Z. Effects of substituted aromatic heterocyclic phosphate salts on properties, crystallization, and melting behaviors of isotactic polypropylene. J Appl Polym Sci. 2006;100:4868–74.
Zhang YF, Xin Z. Isothermal and nonisothermal crystallization kinetics of isotactic polypropylene nucleated with substituted aromatic heterocyclic phosphate salts. J Appl Polym Sci. 2006;101:3307–16.
Menyhárd A, Varga J, Molnár G. Comparison of different β-nucleators for isotactic polypropylene, characterisation by DSC and temperature-modulated DSC (TMDSC) measurements. J Therm Anal Calorim. 2006;83:625–30.
Jana V, Veronika H, Obadal M. Crystallization of polypropylene with a minute amount of β-nucleator. J Therm Anal Calorim. 2006;86:687–91.
Karger-Kocsis J, Varga J. Effects of beta alpha transformation on the static and dynamic tensile behavior of isotactic polypropylene. J Appl Polym Sci. 1996;62:291–300.
Karger-Kocsis J, Varga J, Ehrenstein GW. Comparison of the fracture and failure behaviour of injection molded alpha- and beta-polypropylene in high-speed three-point bending tests. J Appl Polym Sci. 1997;64:2059–66.
Menyhárd A, Gahleitner M, Varga J, Bernreitner K, Jääskeläinen P, Oysad H, et al. The influence of nucleus density on optical properties in nucleated isotactic polypropylene. Eur Polym J. 2009;45:3138–48.
Menyhárd A, Faludi G, Varga J. β-Crystallisation tendency and structure of polypropylene grafted by maleic anhydride and its blends with isotactic polypropylene. J Therm Anal Calorim. 2008;93:937–45.
Zhang ZS, Wang CG, Yang ZG. Crystallization behavior and melting characteristics of PP nucleated by a novel supported β-nucleating agent. Polymer. 2008;49:5137–45.
Li C, Isshiki N, Saito H. Nucleation effect of cyclodextrin inclusion compounds on the crystallization of polypropylene. J Polym Sci Part B: Polym Phys. 2009;47:130–7.
Zhao SC, Zhi C, Xin Z. A highly active novel β-nucleating agent for isotactic polypropylene. Polymer. 2008;49:2745–54.
Dong M, Gu ZX, Yu J, Su ZQ. Crystallization behavior and morphological development of isotactic polypropylene with an aryl amide derivative as β-form nucleating agent. J Polym Sci: Polym Phys. 2008;46:1725–33.
Dong M, Guo ZX, Su ZQ, Yu J. Study of the crystallization behaviors of isotactic polypropylene with sodium benzoate as a specific versatile nucleating agent. J Polym Sci: Polym Phys. 2008;46:1183–92.
Wang JB, Dou Q. Nonisothermal crystallization kinetics and melting behaviors of isotactic polypropylene/N,N′,N″-tris-tertbutyl-1,3,5-benzene-tricarboxamide. J Macromol Sci: Phys. 2008;47B:629–42.
Wang JD, Dou Q. Crystallization behaviors and optical properties of isotactic polypropylene: comparative study of a trisamide and a rosin-type nucleating agent. Colloid Polym Sci. 2008;286:699–705.
Liu MX, Guo BC, Du ML, Chen F, Jia DM. Halloysite nanotubes as a novel β-nucleating agent for isotactic polypropylene. Polymer. 2009;50:3022–30.
Menczel J, Varga J. Influence of nucleating agents on crystallization of polypropylene. 1. Talc as a nucleating agent. J Therm Anal. 1983;28:161–74.
Zhang YF, Xin Z. Isothermal crystallization behaviors of isotactic polypropylene nucleated with α/β compounding nucleating agents. J Polym Sci: Polym Phys. 2007;45:590–6.
Zhang YF. Crystallization and melting behaviors of isotactic polypropylene nucleated with compound nucleating. J Polym Sci: Polym Phys. 2008;46:911–6.
Bai HW, Wang Y, Liu L, Zhang J, Han L. Nonisothermal crystallization behaviors of polypropylene with α/β nucleating agents. J Polym Sci B: Polym Phys. 2008;46:1853–67.
Bai HW, Wang Y, Zhang Q, Liu L, Zhou W. A comparative study of polypropylene nucleated by individual and compounding nucleating agents. I. Melting and isothermal crystallization. J Appl Polym Sci. 2009;111:1624–37.
Smith TL, Masilamani D, Bui LK. The mechanism of action of sugar acetals as nucleating agents for polypropylene. Macromolecules. 1994;27:3147–55.
Kristiansen M, Tervoort T, Smith P. Mechanical properties of sorbitol-clarified isotactic polypropylene: influence of additive concentration on polymer structure and yield behavior. Macromolecules. 2005;38:10461–5.
Zhang YF, Li X, Wei XS. Non-isothermal crystallization kinetics of isotactic polypropylene nucleated with 1,3:2,4-bis(3,4-dimethylbenzylidene) sorbitol. J Therm Anal Calorim 99(3). doi:10.1007/s10973-009-0372-1.
Xiao WC, Wu PY, Feng JC. Effect of β-nucleating agents on crystallization and melting behavior of isotactic polypropylene. J Appl Polym Sci. 2008;108:3370–9.
Xiao WC, Wu PY, Feng JC, Yao RY. Influence of a novel β-nucleating agent on the structure, morphology, and nonisothermal crystallization behavior of isotactic polypropylene. J Appl Polym Sci. 2009;111:1076–85.
Xu L, Xu K, Chen H, Zheng Q, Liu F, Chen M. Thermal behavior of isotactic polypropylene in different content of β-nucleating agent. J Therm Anal Calorim. 2009;96:733–40.
Turner Jones A, Aizelwood JM, Beckett DR. Crystalline forms of isotactic polypropylene. Makromol Chem. 1964;75:134–58.
Li JX, Cheung WL, Jia DM. A study on the heat of fusion of β-polypropylene. Polymer. 1999;40:1219–22.
Li JX, Cheung WL. A correction function to determine the β-fusion heat in a mixture of α- and β-PP. J Therm Anal Calorim. 2000;61:757–62.
Vilanova PC, Ribas SM, Guzman GM. Isothermal crystallization of poly(ethylene-terephthalate) of low molecular weight by differential scanning calorimetry: 1. Crystallization kinetics. Polymer. 1985;26:423–8.
Avrami M. Kinetics of phase change. I. General theory. J Chem Phys. 1939;7:1103–12.
Avrami M. Kinetics of phase change. II. Transformation-time relations for random distribution of nuclei. J Chem Phys. 1940;8:212–24.
Avrami M. Kinetics of phase change. III. Granulation, phase change, and microstructure. J Chem Phys. 1941;9:177–84.
Huang JW. Dispersion, crystallization kinetics, and parameters of Hoffman-Lauritzen theory of polypropylene and nanoscale calcium carbonate composite. Polym Eng Sci. 2009;49:1855–64.
Kissinger HE. The crystallization kinetics with heating rate in differential thermal analysis. J Res Natl Bur Stand. 1956;57:217–21.
Acknowledgements
The research was partly financed by the National High Technology Research and Development Program of China (863 Program No. 2009AA03Z319) and the National Natural Science Foundation of China (No. 50905024).
Author information
Authors and Affiliations
Corresponding authors
Rights and permissions
About this article
Cite this article
Wei, Z., Zhang, W., Chen, G. et al. Crystallization and melting behavior of isotactic polypropylene nucleated with individual and compound nucleating agents. J Therm Anal Calorim 102, 775–783 (2010). https://doi.org/10.1007/s10973-010-0725-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10973-010-0725-9