Effect of sequence distribution on the non-isothermal crystallization of copolyamide 4/6
Source abstract
Abstract
Copolyamide 4/6 (PA4/6) was synthesized by copolymerizing 2-pyrrolidone and ε-caprolactam; 2-pyrrolidone was obtained from biomass. The melting point of PA4/6 (140–190 °C) was found to be lower than those of both PA4 (265.1 °C) and PA6 (220.4 °C) for easier processing. For further applications, the effects of the structural sequence composition on the thermal and crystalline properties of the material were investigated. When the content of the PA4 structural sequence S44 was higher than that of the copolymerized structural sequence S46, the sequence S44 exhibits the crystalline behavior of PA4. However, when the S46 content was similar to the homopolymer sequence content, the melting point and crystallinity reached the respective minima, indicating the most imperfect crystallization. Kinetics analysis of non-isothermal crystallization demonstrated that the crystal grows into a two-dimensional sheet shape, which has the longest crystallization half-time (t1/2 = 2.64 min) and the highest activation energy (− 10.8 kJ mol−1). When the content of the PA6 structural sequence S66 increases to more than that of S46, the crystal exhibits three-dimensional spherical growth, t1/2 decreases to 1.25 min, the activation energy decreases to − 18.0 kJ mol−1, and consequently, the crystal structure becomes more perfect. This indicates that S46 destroys the regular arrangement of molecular chains, whereas the addition of S66 improves the crystalline structure.
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Research context
OpenAlex topics: biodegradable polymer synthesis and properties · Polymer crystallization and properties · Polymer Nanocomposites and Properties
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