Analysis of the feasibility of Avrami equation to amino acid endcapped PPDO crystallization by using Malek and Mitsuhashi method. Issue 10 (16th September 2016)

• Record Type: Journal Article
• Authors: Wang, Bing; Chen, Chuan; Wu, Chang Qiang; Luo, Le; Chen, Dong Liang; Dong, Jun; Zhu, Jiang; Shen, Cheng Yi; Zhang, Xiao Ming
• Is Part Of: Crystal research and technology. Volume 51:Issue 10(2016)
• Page Start: 569
• Page End: 574
• Publication Date: 2016-09-16
• Subjects: polyester -- isothermal crystallization -- Avrami equation -- feasibility -- Malek and Mitsuhashi method; Crystallography -- Periodicals; 548
• DOI: 10.1002/crat.201600137
• Languages: English
• ISSNs: 0232-1300

Abstract

Abstract : Under conditions of isothermal crystallization without nucleating agents, homogeneous nucleation is the deciding factor for the compatibility of the Avrami equation. The homogeneous nucleation of polymers is possibly affected by several factors. After employing the Malek and Mitsuhashi method, the L‐Gly‐ end‐capped PPDO and L‐Leu‐, L‐Phe‐end‐capped PPDO crystallized at higher temperatures are not suitable for analysis by Avrami equation, reveals both structures and crystallization temperatures could affect the application of Avrami equation in PPDO crystallization. Abstract : Typically, the crystallization kinetics behaviour of biodegradable polyester could be described by the Avrami equation; however, for the appropriate application of this equation, some assumptions are required. Under conventional conditions of isothermal crystallization without nucleating agents, homogeneous nucleation is the key factor for the compatibility of this equation. On account of structural characteristics, the homogeneous nucleation of polymers is possibly affected by several factors. In this study, we investigated the isothermal crystallization of four PPDOs end‐capped with amino acids, followed by the Avrami equation analysis. After employing the method reported by Malek and Mitsuhashi, the L‐Gly‐ end‐capped PPDO and L‐Leu‐, L‐Phe‐end‐capped PPDO crystallized at higher temperatures were not suitable for analysis by the Avrami equation. In addition, this result was substantiated by reasoning the polymer chains' mobility which could be affected by the terminated amino acids' steric hindrance and crystallization temperatures, subsequently affecting homogeneous nucleation.