Isothermal Crystallization of Isotactic Polypropylene Nucleated with a Novel Aromatic Heterocyclic Phosphate Nucleating Agent. Issue 11 (2nd December 2017)

• Record Type: Journal Article
• Authors: Zhang, Yue-Fei; He, Bin; Hou, Huan-Huan; Guo, Li-Hua
• Is Part Of: Journal of macromolecular science. Volume 56:Issue 11/12(2017)
• Page Start: 811
• Page End: 820
• Publication Date: 2017-12-02
• Subjects: Aromatic heterocyclic phosphate salts -- crystallization kinetics -- isotactic polypropylene -- nucleating agent; Polymerization -- Periodicals; Polymers -- Periodicals; 530.413
• DOI: 10.1080/00222348.2017.1385360
• Languages: English
• ISSNs: 0022-2348

Abstract

ABSTRACT: The incorporation of a nucleating agent into isotactic polypropylene (iPP) is one of the most important and widely used methods to improve performance in the polypropylene industry. Aromatic heterocyclic phosphate salt is a kind of highly effective nucleating agent for iPP and one of the typical products is a compound nucleating agent based on 2, 2-methylene-bis (4, 6-di-tert-butylphenyl) phosphate hydroxyl aluminum (commercial product name: ADK NA-21). In this paper the isothermal crystallization kinetics of iPP nucleated with the α-nucleating agent NA-21, investigated using differential scanning calorimetry (DSC), is described with the crystallization data being analyzed by using the classic Avrami method. During isothermal crystallization the addition of nucleating agent NA-21 dramatically shortened the crystallization half time (t1/2 ) of iPP under the same conditions and the crystallization activation energy, ΔE, decreased from 422 kJ/mol for virgin iPP to 369 kJ/mol with the addition of NA-21. Thus, the addition of NA-21 significantly increased the crystallization rate of iPP.