Controllable Crystallization Behavior of Nylon-6/66 Copolymers Based on Regulating Sequence Distribution

Tang, Jie; Xu, Bowen; Xi, Zhenhao; Pan, Xun; Zhao, Liang

doi:10.1021/acs.iecr.8b02671

Cited by 25 publications

(28 citation statements)

References 46 publications

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“…This happened because the BAEA/AA segments ruined the symmetry and regularity of the polymer chains for the PA6 copolyamides and raised its intra-crystalline defect. A similar result was found in the crystallization behavior of most of the copolymers (i.e., the crystal size reduced), which indicates that the PA6 with the BAEA/AA structure was non-isomorphous [ 15 , 22 , 42 , 62 ].…”

Section: Resultssupporting

confidence: 74%

“…The T m o values of the copolyamide decreased sharply from 259.1 to 196.7 °C, indicating that the BAEA/AA segment may restrict the crystal growth of the PA6 backbone to form a tapering in crystal thickness, which is consistent with the WAXD results [ 35 , 36 , 37 , 38 ]. It is noteworthy that two different dependencies between T c and T m (peak I and peak II corresponding to Figure 3 a,b) were observed using the Hoffman–Weeks method, which implied that the crystal growth of peaks I and II corresponded to the thermodynamically stable α-form and unstable γ-form, respectively [ 25 , 35 , 39 , 40 , 41 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

“…The crystallization rate K and Avrami exponent n in PA6-15 were significantly lower than that of PA6-5, which reveals that BAEA/AA played a significant role in the crystallization rate and the mechanism of crystallization growth in the PA6 polymer chain. A small amount of the BAEA/AA within the PA6 backbone played an essential role in disrupting the ordered crystal arrangement [ 42 ]. In addition, the Avrami exponent n of PA6-5 exhibited superior value when compared to neat PA6, although its crystallization rate K was significantly lower, which was possibly due to the smaller amount of BAEA/AA segments, which enhances the softness of the overall PA6 structure and facilitating the formation of larger crystal dimension [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

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Effect of Bis (2-Aminoethyl) Adipamide/Adipic Acid Segment on Polyamide 6: Crystallization Kinetics Study

et al. 2020

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The crystallization behavior of novel polyamide 6 (PA6) copolyamides with different amounts of bis (2-aminoethyl) adipamide/adipic acid (BAEA/AA) segment was investigated. The wide-angle X-ray diffraction (WAXD) results showed that as the amount of BAEA/AA segment increased to 10 mole%, the crystalline forms of all PA6 copolyamide were transferred from the stable α-form to the unstable γ-form because of the complex polymer structure. According to studies of crystallization kinetics, the Avrami exponent (n) values for all copolyamide samples ranged from 1.43 to 3.67 under isothermal conditions, implying that the crystallization is involved in the two- to three-dimensional growth at a high temperature of isothermal condition. The copolyamides provided a slower crystallization rate and higher crystallization activation energy (ΔEa) than neat PA6. Polyamide containing 10 mole% of BEAE/AA content exhibited a unique crystallization behavior in the coexistence of the α and γ forms. These results deepen our understanding of the relationship between BAEA/AA content, crystal structure, and its crystallization behavior in low-melting PA6, and they make these types of copolyamides useful for their practical application.

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of Bis (2-Aminoethyl) Adipamide/Adipic Acid Segment on Polyamide 6: Crystallization Kinetics Study

et al. 2020

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“…In recent years, PA6-based copolymers have been widely studied from both scientific and technological perspectives, owing to their remarkable properties. Inserting co-constituents (such as comonomers, stereoisomers, branches, and organic and/or inorganic fillers) can yield PA6 copolymers with interesting physical and mechanical properties [14]. The crystallization of the PA6 copolymer is strongly affected by the presence of a second component.…”

Section: Introductionmentioning

confidence: 99%

Isothermal Crystallization Kinetics Study of Fully Aliphatic PA6 Copolyamides: Effect of Novel Long-Chain Polyamide Salt as a Comonomer

2019

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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.

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“…e external packaging layer of ISA was prepared by nylon 6/66 copolymer based on 3D printing technology. e material has excellent heat resistance and mechanical properties [18]. e technical indicators are shown in Table 3.…”

Section: External Packaging Layermentioning

confidence: 99%

Study on the Evaluation Standard of Construction Quality for Asphalt Pavement Based on the Intelligent Sensing Aggregate

Zhang

Zheng

2021

Advances in Civil Engineering

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The traditional evaluation method of construction quality for asphalt pavement has gradually lagged behind the pace of development of the road industry. Big data, Internet of Things (IoT), and intelligent sensing technology have been reflected in the field of road engineering, but these technologies also have technical shortcomings in terms of applicability, durability, real-time performance, and portability in practice. To provide a new method for construction quality evaluation of asphalt pavement, this study developed an intelligent sensing aggregate (ISA) with low cost and high precision based on the 3D printing and Internet of Things (IoT) technology. Based on the laboratory test and field test, the sensing characteristics, high-temperature resistance, and mechanical properties of ISA are analyzed to verify the reliability of ISA. Through the quantitative analysis of ISA perception data, the Driving Perception Index (DPI) is proposed. By analyzing the quantitative correlation between the spatial angle of ISA and the compaction degree, the quantitative correlation between the DPI, International Roughness Index (IRI), and the deflection value, the evaluation standard of construction quality for asphalt pavement is established. The result shows that the best baud rate for ISA is 9600 bps, and the corresponding data transmission distance is 350 m. In the range of 6 m, the cars, trucks, trailers, and buses can be perceived by ISA. The maximum operating temperature of ISA is up to 200°C. Embedding ISA into asphalt mixture has no significant effect on original gradation of asphalt mixture. The established evaluation standard of construction quality for asphalt pavement takes into account the compaction quality, the requirements of bearing capacity, and the driving comfort of asphalt pavement, which is suitable for expressway and first-class highway.

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Controllable Crystallization Behavior of Nylon-6/66 Copolymers Based on Regulating Sequence Distribution

Cited by 25 publications

References 46 publications

Effect of Bis (2-Aminoethyl) Adipamide/Adipic Acid Segment on Polyamide 6: Crystallization Kinetics Study

Effect of Bis (2-Aminoethyl) Adipamide/Adipic Acid Segment on Polyamide 6: Crystallization Kinetics Study

Isothermal Crystallization Kinetics Study of Fully Aliphatic PA6 Copolyamides: Effect of Novel Long-Chain Polyamide Salt as a Comonomer

Study on the Evaluation Standard of Construction Quality for Asphalt Pavement Based on the Intelligent Sensing Aggregate

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