Crystallization of poly(hexamethylene carbonate)-co-poly(hexamethylene urethane) segmental block copolymers: From single to double crystalline phases

Zhang, Chunbo; Pérez-Camargo, Ricardo A.; Zheng, Liuchun; Zhao, Ying; Liu, Guoming; Wang, Lei; Wang, Dujin

doi:10.1016/j.polymer.2021.123675

Cited by 10 publications

(7 citation statements)

References 45 publications

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“…Our group has recently studied isodimorphism in several random copolymer systems [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. Isodimorphic crystallization has recently been found in different types of random copolymers such as poly (decamethylene succinate- ran -decamethylene fumarate), poly (butylene succinate-co-cis-butene succinate) and poly (hexamethylene carbonate)-co-poly (hexamethylene urethane) [ 30 , 31 , 32 , 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

“…Our group has recently studied isodimorphism in several random copolymer systems [19][20][21][22][23][24][25][26][27][28][29]. Isodimorphic crystallization has recently been found in different types of random copolymers such as poly (decamethylene succinate-ran-decamethylene fumarate), poly (butylene succinate-co-cis-butene succinate) and poly (hexamethylene carbonate)-co-poly (hexamethylene urethane) [30][31][32][33][34][35]. (3) Total exclusion behavior: When the repeating units of two homopolymers are dissimilar, the minor comonomer would be completely kept out from the crystalline structure of the main component.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Structure, Crystallization and Mechanical Properties of Isodimorphic PBS-ran-PCL Copolyesters

et al. 2021

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Isodimorphic behavior is determined by partial inclusion of comonomer segments within the crystalline structure and arises from the comparatively similar repeating chain units of the parental homopolymers. Isodimorphic random copolymers are able to crystallize irrespective of their composition and exhibit a pseudo-eutectic behavior when their melting point values are plotted as a function of comonomer content. At the pseudo-eutectic point or region, two crystalline phases can coexist. On the right-hand and the left-hand side of the pseudo-eutectic point or region, only one single crystalline phase can form which is very similar to the crystalline structures of the parent homopolymers. This article aims to study the synthesis method, structure, crystallization behavior and mechanical properties of isodimorphic random PBS-ran-PCL copolyesters. Moreover, this study provides a comprehensive analysis of our main recent results on PBS-ran-PCL random copolyesters with three different molecular weights. The results show that the comonomer composition and crystallization conditions are the major factors responsible for the crystalline morphology, crystallization kinetics and mechanical performance of isodimorphic random copolyesters. Our studies demonstrate that in the pseudo-eutectic region, where both crystalline phases can coexist, the crystallization conditions determine the crystalline phase or phases of the copolymer. The relationships between the comonomer composition and mechanical properties are also addressed in this work.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis, Structure, Crystallization and Mechanical Properties of Isodimorphic PBS-ran-PCL Copolyesters

et al. 2021

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“…The subsequent heating curves with broad melting peaks, which result from the overlapping signals of different types of crystals, are shown in Figure 3 b, [ 28 ]. Based on the melting process of co-crystal in PBS/PBF blends [ 21 ], it is easy to distinguish that T m1 and T m2 correspond to melting of PBS and PBF crystals, respectively, and that the melting peak at the lower temperature of PBS-UPy/PBF-UPy-40/60 is attributed to the melting of PBS crystals, which will be demonstrated based on crystal structure confirmation in the following section.…”

Section: Resultsmentioning

confidence: 99%

Promoting Co-Crystallization in Poly(butylene succinate) and Poly(butylene fumarate) Blends via End-Group Functionalization

Wei

Chen

et al. 2022

Molecules

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Co-crystallization plays a crucial role in the integration and regulation of thermal and mechanical properties in polymer blends, but the poor compatibility of the components in the crystal phase has always been a major obstacle to co-crystallization, which puts forward stricter requests for linkage and interaction between different entities. On the basis of the hydrogen-bonding interaction that can promote chain stacking and thus improve miscibility, we propose that crystalline/crystalline blends of 2-ureido-4[1H]-pyrimidinone (UPy)-functionalized poly(butylene succinate) and poly(butylene fumarate) (PBS-UPy/PBF-UPy) where UPy groups with quadruple hydrogen-bonding interaction are employed to connect different chain ends, could inhibit phase separation and improve co-crystallization. PBS-UPy/PBF-UPy blends exhibit complex component-dependent and cooling-rate-dependent co-crystallization behavior. A high level of co-crystallization occurs in the range of PBS-UPy-rich fractions, and the proportion could approach over 98% under optimized conditions with the aid of UPy quadruple hydrogen bonds interaction. This work enriches the understanding of co-crystallization in crystalline/crystalline polymer blends and provides more possibility for the design of structures and properties of polymer materials.

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“…However, these two characteristics might not be enough to define an isomorphic behavior. Zhang et al (2021) revised the crystallization behavior of poly (hexamethylene carbonate-co-hexamethylene urethane), PHC x U y , segmented block copolymers, which crystallization mode was previously (Shen et al, 2018) defined as isomorphic. In the first evaluation of these copolymers, single T c and T m values were obtained, displaying a linear increase with the composition, as shown in Figures 9A,B.…”

Section: Isomorphic Vs Isodimorphic Copolymersmentioning

confidence: 99%

“…This is evident at the lowest HU contents, where the PC fractions at the lowest temperatures begin to be the dominant ones. Thanks to the SSA fractionation, the authors concluded that the PHCU copolymers are not isomorphic nor isodimorphic (e.g., they do not exhibit a pseudo-eutectic point), and instead, they exhibited complex co-crystallization behavior (Zhang et al, 2021). Such a complex crystallization behavior is related to a different chain distribution compared with random copolymers.…”

Section: Isomorphic Vs Isodimorphic Copolymersmentioning

confidence: 99%

Recent applications of the Successive Self-nucleation and Annealing thermal fractionation technique

Pérez-Camargo

Cavallo²,

Müller³

2022

Front. Soft. Matter

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Successive Self-nucleation and Annealing (SSA) is a thermal fractionation technique that is performed by Differential Scanning Calorimetry (DSC). The combination of non-isothermal and isothermal steps applied during SSA achieves efficient molecular segregation during polymer crystallization. Such molecular segregation magnifies the effect of defects in polymer chain crystallization, thereby providing information on chain structure. The technique was created and implemented by Müller and co-workers in 1997, becoming a powerful resource for studying ethylene/α-olefin copolymers. The different variables to design the SSA protocol: fractionation window, fractionation time, scanning rate, sample mass, and the first self-nucleation temperature to be applied (Ts, ideal), have been previously reviewed, together with the different applications of SSA. SSA versatility, simplicity (when properly applied), and short times to produce results have allowed its use to study novel and more complex polymeric systems. This review article explores the most recent applications of SSA of the past decade. First, the principles of the technique are briefly explained, covering all the relevant variables. Next, we have selected different cases that show how SSA is employed in various novel fields, such as studying intermolecular interactions and topological effects in homopolymers; supernucleation and antinucleation effects in nanocomposites, including the pre-freezing phenomenon; crystallization modes in random copolymers; solid-solid transitions; miscibility, co-crystallization and composition in blends; evaluation of polymer synthesis variables; and the novel information that could be gained by using fast scanning chip-based calorimetry. Finally, we offer a perspective on SSA, a technique that has become a powerful method for studying the distribution of defects affecting crystallization in semi-crystalline polymers.

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Crystallization of poly(hexamethylene carbonate)-co-poly(hexamethylene urethane) segmental block copolymers: From single to double crystalline phases

Cited by 10 publications

References 45 publications

Synthesis, Structure, Crystallization and Mechanical Properties of Isodimorphic PBS-ran-PCL Copolyesters

Synthesis, Structure, Crystallization and Mechanical Properties of Isodimorphic PBS-ran-PCL Copolyesters

Promoting Co-Crystallization in Poly(butylene succinate) and Poly(butylene fumarate) Blends via End-Group Functionalization

Recent applications of the Successive Self-nucleation and Annealing thermal fractionation technique

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