Abstract
N1, N6-bis (4-aminobutyl) adipamide (BABA) diamine and sebacic acid (SA), also called BABA/SA polyamide salt, were used in a typical melt polymerization processes of polyamide 6 (PA6) to form a series of PA6-BABA/SA copolyamides. The effects of BABA/SA on the isothermal crystallization kinetics of PA6-BABA/SA were studied for the first time. An isothermal crystallization analysis demonstrates that the PA6-BABA/SA matrix provided a higher crystallization rate and shorter half-crystallization time than virgin PA6 did. The degree of crystallization of the PA6-BABA/SA30 matrix was also the lowest among all of the samples considered herein. This result is attributed to the high nucleation efficacy of a small amount of BABA/SA in the crystallization of PA6. Values of the Avrami exponent (n) from 1.84 to 3.91 were observed for all of the polyamide samples, suggesting that the crystallization was involved via a two- to three-dimensional growth mechanism. These findings deepen our understanding of the structure–property relationship of PA6-BABA/SA copolyamides, favoring their practical application.
Highlights
Nylons, known as polyamides, are important commercial engineering thermoplastic materials that are used in a large range of applications owing to their excellent properties, including their high temperature- and corrosion-resistance, toughness, and modulus, as well as their anti-fatigue and oil-proof characteristics [1,2]
The current study focuses on the effects of the BABA/sebacic acid (SA) content on the crystal morphology and isothermal crystallization processes of polyamide 6 (PA6)-BABA/SA copolyamides, which are compared with those of virgin PA6
The polyamide salt was melt-polymerized with PA6 at weight percentages of 30%, 50%, and 70%
Summary
Known as polyamides, are important commercial engineering thermoplastic materials that are used in a large range of applications owing to their excellent properties, including their high temperature- and corrosion-resistance, toughness, and modulus, as well as their anti-fatigue and oil-proof characteristics [1,2]. A series of PA6 copolyamides have been synthesized [19,20]; a detailed investigation on the effect of the amount of the second component on a copolymer of PA6 and a bio-based monomer, as well as on its isothermal crystallization kinetics, is lacking. In a subsequent investigation [22], we synthesized a series of PA6 copolyamides (PA6-N1 , N6 -bis (4-aminobutyl) adipamide (BABA)/sebacic acid (SA)) using novel long-chain diamine (N1 , N6 -bis (4-aminobutyl) adipamide) diamine, BABA), and polyamide salt (BABA/SA) monomers. The crystallization kinetic parameters are estimated, and the relative crystallinities of virgin PA6 and PA6-BABA/SA are examined
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