The Investigation of Copolymer Composition Sequence on Non-Isothermal Crystallization Kinetics of Bio-Based Polyamide 56/512

Gan, Diansong; Liu, Yuejun; Hu, Tianhui; Fan, Shuhong; Liu, Xiaochao; Cui, Lingna; Yang, Ling; Wu, Yincai; Chen, Lily; Mo, Zhixiang

doi:10.3390/polym15102345

Cited by 4 publications

(6 citation statements)

References 41 publications

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“… ( a 1 ) [ 21 ] The second heating DSC curves of PA56/512 resin with different composition ratios, ( a 2 ) the first heating DSC curves of BOPA-56/512 with different composition ratios, the crystallization curves of ( b 1 ) [ 21 ] PA56/512 resin, ( b 2 ) BOPA-56/512 with different composition ratios. All the samples are set at heating/cooling rates of 10 °C/min.…”

Section: Figures and Schemementioning

confidence: 99%

“… ( a ) [ 21 ] The melting temperature curves and ( b ) crystallization temperature curves of PA56/512 before and after biaxial stretching with different content of 512. …”

Section: Figures and Schemementioning

confidence: 99%

“…As an ideal compatibility mode, the copolymerized components of the co-crystallization system have the ability to form a unified or similar crystal, which can be divided into isomorphism [ 19 ] and isodimorphism [ 20 ] behavior according to the difference in compatibility between each copolymerized unit. Many studies have shown that the regulation of specific properties of copolymers can be achieved by adjusting the ratio of the copolymer components, such as the combination properties of high strength and high toughness, high heat resistance and high toughness [ 12 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…We have systematically studied the structure, molecular weight, thermal properties and non-isothermal crystallization kinetics of PA56/512 resins with different monomer ratios in our previous studies [ 21 ]. Based on those, the preparation of biaxially-oriented PA56/512 films (BOPA-56/512) modified by long carbon chain copolymerization and the relationship between its microstructure evolution and macroscopic properties under biaxially-oriented conditions are demonstrated in this work.…”

Section: Introductionmentioning

confidence: 99%

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Pseudo-Eutectic of Isodimorphism to Design Biaxially-Oriented Bio-Based PA56/512 with High Strength, Toughness and Barrier Performances

Gan,

Liu,

et al. 2024

Polymers

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The biaxially-oriented PA56/512 has excellent mechanical strength, extensibility and water–oxygen barrier properties and has broad application prospects in green packaging, lithium battery diaphragm and medical equipment materials. The correlation between the aggregation structure evolution and macroscopic comprehensive properties of copolymer PA56/512 under biaxial stretching has been demonstrated in this work. The structure of the random copolymerization sequence was characterized by 13C Nuclear magnetic resonance (NMR). The typical isodimorphism behavior of the co-crystallization system of PA56/512 and its BOPA-56/512 films was revealed by differential scanning calorimetry (DSC) and X-ray diffraction (XRD) tests. And the aggregation structure, including the hydrogen bond arrangement, crystal structure and crystal morphology of PA56/512 before and after biaxial stretching, was investigated by XRD, Fourier-transform infrared spectroscopy (FTIR) and polarized optical microscopy (POM) tests. Furthermore, the effect of the biaxially-oriented stretching process on the mechanical properties of PA56/512 has been demonstrated. In addition, a deep insight into the influence of the structure on the crystallization process and physical–mechanical performance has been presented. The lowest melting point at a 512 content of 60 mol% is regarded as a “eutectic” point of the isodimorphism system. Due to the high disorder of the structural units in the polymer chain, the transition degree of the folded chain (gauche conformation) is relatively lowest when it is straightened to form an extended chain (trans conformation) during biaxially-oriented stretching, and part of the folded chain can be retained. This explains why biaxially stretched PA56/512 has high strength, outstanding toughness and excellent barrier properties at the pseudo-eutectic point. In this study, using the unique multi-scale aggregation structure characteristics of a heterohomodymite polyamide at the pseudo-eutectic point, combined with the new material design scheme and the idea of biaxial-stretching processing, a new idea for customized design of high-performance multifunctional polyamide synthetic materials is provided.

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Section: Figures and Schemementioning

confidence: 99%

“… ( a ) [ 21 ] The melting temperature curves and ( b ) crystallization temperature curves of PA56/512 before and after biaxial stretching with different content of 512. …”

Section: Figures and Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pseudo-Eutectic of Isodimorphism to Design Biaxially-Oriented Bio-Based PA56/512 with High Strength, Toughness and Barrier Performances

Gan,

Liu,

et al. 2024

Polymers

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“…These bio-based polymers can reduce dependence on nonrenewable petrochemical resources [2], decrease greenhouse gas emissions, and eventually provide environmentally and socially sustainable developments, leading to a low-carbon-footprint society [3]. Polyamide 66 (PA66) is a versatile thermoplastic with a wide range of applications, including engineering plastics [4], fibers [5], and films [6,7], because of its good physical and mechanical properties [8]. To date, it is still difficult to produce bio-based PA66 without bio-sourced monomers, 1,6-hexamethylene diamine [9,10].…”

Section: Introductionmentioning

confidence: 99%

The Relationships between the Structure and Properties of PA56 and PA66 and Their Fibers

Luo,

Liu,

Abbay

et al. 2023

Polymers

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Bio-based polymers can reduce dependence on nonrenewable petrochemical resources and will be beneficial for future sustainable developments due to their low carbon footprint. In this work, the feasibility of bio-based polyamide 56 (PA56) substituting petroleum-based PA66 is systematically investigated. The crystallization, melting, and decomposition temperature of PA56 were all lower than that of PA66. PA56 formed a γ crystal type with larger grain size and took a longer amount of time to complete the crystallization process since its crystallization rate was lower than that of PA66. Compared with PA66, PA56 exhibited a higher tensile strength of 71.3 ± 1.9 MPa and specific strength of 64.8 ± 2.0 MPa but lower notched impact strength. More importantly, the limited oxygen index and vertical combustion measurement results indicated that the flame retardancy of PA56 was better than PA66, and the LOI values and the UL94 result of PA56 were 27.6% ± 0.9% and V-2. It is worth noting that the PA56 fiber had superior biodegradability compared to the PA66 fiber. PA56 showed significant biodegradation from the eighth week, whereas PA66 remained clean until the sixteenth week (without obvious biodegradation taking place). Eventually, PA56 did not show significant differences compared to PA66 in terms of thermal and mechanical properties. However, PA56 had great advantages in flame retardancy and biodegradability, indicating that the bio-based PA56 could potentially replace petroleum-based PA66 in many fields.

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Synthesis and comprehensive characterization of bio-based polyamide 56/6 Copolymer: Mechanical, Thermal, and processing properties

Haoyu,

Xiaoqi,

Yiming

et al. 2024

European Polymer Journal

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The Investigation of Copolymer Composition Sequence on Non-Isothermal Crystallization Kinetics of Bio-Based Polyamide 56/512

Cited by 4 publications

References 41 publications

Pseudo-Eutectic of Isodimorphism to Design Biaxially-Oriented Bio-Based PA56/512 with High Strength, Toughness and Barrier Performances

Pseudo-Eutectic of Isodimorphism to Design Biaxially-Oriented Bio-Based PA56/512 with High Strength, Toughness and Barrier Performances

The Relationships between the Structure and Properties of PA56 and PA66 and Their Fibers

Synthesis and comprehensive characterization of bio-based polyamide 56/6 Copolymer: Mechanical, Thermal, and processing properties

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