The Crystallization and Melting Behaviors of PDLA-b-PBS-b-PDLA Triblock Copolymers

Feng, Congshu; Chen, Yun; Shao, Jianda; Gao, Li; Hou, Haoqing

doi:10.1007/s10118-020-2361-6

Cited by 12 publications

(7 citation statements)

References 55 publications

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“…The n and ln k values are listed in Table . As listed in Table , all the n values were ranging from 2 to 3 and were not integers, which indicated that more than one growing mechanisms were produced in these specimens. , The n values in all the specimens did not exhibit obvious discrepancy, which indicated that the growth dimensions of HC were similar.…”

Section: Resultsmentioning

confidence: 82%

The Crystallization Behavior of Poly(l-lactic acid)/Poly(d-lactic acid) Electrospun Fibers: Effect of Distance of Isomeric Polymers

Feng

Chen

Shao

et al. 2020

Ind. Eng. Chem. Res.

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Blending of poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) would produce polylactide stereocomplex crystallites (PLA SC). In the PLLA/PDLA specimens prepared by solution mixing or melt blending, the isomeric polymers were mixed in the molecular level. When the distance of these isomers increased, the crystallization behaviors of PLLA/PDLA were not clear yet. In this study, PLLA/PDLA blends were prepared by different electrospinning methods, i.e., spinning by mixed solution (DL-A), side-by-side mode (DL-B), and double spinnerets (DL-C). Results revealed that the distances between isomeric molecules increased in the order of DL-A, DL-B, and DL-C, and this distance influences the phase transition and subsequently crystallization behaviors. In the DL-A, the homochiral crystallites (HC) developed at first, and then SC formed in the specimen with lower content of PDLA. The formation of SC was observed at first, and less or no content of HC was developed with higher content of PDLA. For the DL-B group, the formation of HC was observed at ∼100 °C, and the SC were produced around 140 °C irrespective of composition. More content of SC was produced during or after melting of HC. When referring to the DL-C group, the HC developed at the first stage, and the SC were produced during or after melting of PLA HC. In addition, the SC that developed in the three groups have different nucleation efficiencies for the subsequent formation of HC. The nucleation efficiency increased in the order of DL-A < DL-B < DL-C, and these results hinted that not only the content but also the distribution of SC affects the formation of HC.

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Section: Resultsmentioning

confidence: 82%

The Crystallization Behavior of Poly(l-lactic acid)/Poly(d-lactic acid) Electrospun Fibers: Effect of Distance of Isomeric Polymers

Feng

Chen

Shao

et al. 2020

Ind. Eng. Chem. Res.

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“…Different from the conventional block copolymers-two or more different long polymer chains linked together, − the TP-PETPG X copolymer prepared by target copolymerization possesses a microblock structure with relatively shorter PET segments (22–31 repeat unit number) and PEPG segments (3–5 repeat unit number). What is more, with the increase in PEPG content, not only the reaction probability between PEPG and terminal hydroxyl of PET increases but also the reaction probability of PEPG itself also increases.…”

Section: Results and Discussionmentioning

confidence: 99%

Targeted Copolymerization in Amorphous Regions for Constructing Crystallizable Functionalized Copolymers

Chen

Guo

et al. 2021

Macromolecules

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Heavily damaged or disappeared crystallizability caused by nonselective chemical binding of functional units is a universal and challenging issue for random functionalized copolymers. Herein, we propose a temperature-controlled targeted copolymerization that can selectively activate the amorphous region segments of polymers and directionally copolymerize the functional units into this region while retaining the regular segments and crystallizability of the original crystalline region. A flame-retardant functional monomer and typical semicrystalline polyester are chosen to verify our state-of-the-art targeted copolymerization approach. Compared with the corresponding random copolymers, the resulting microblock copolymers exhibit a much higher crystallinity and faster crystallization rate while keeping other functionalities. Even at a high functional unit content (16.7 mol %), targeted copolymerization can endow copolymers with good crystallinity, while the corresponding random copolymer is totally noncrystallizable. Hence, targeted copolymerization chemistry provides a pioneering opportunity to achieve functionalization and maximum retention of crystallization ability at the same time, allowing purposeful tailoring of macroscopic performance by precisely regulating the sequential distribution of microstructure units.

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“…On the other hand, there was a gradual decrease in crystallization and melting enthalpies for the PBS block when a considerable amount of PDLA was incorporated into the copolymer (Scheme 77). 54…”

Section: Pbs Copolymers With Hydroxy Acid Unitsmentioning

confidence: 99%

“…The PDLA- b -PBS- b -PDLA tri-block copolymer was synthesized by the ring opening polymerization of d -LA in the presence of hydroxyl capped PBS and tin( ii ) 2-ethylhexanoate (Sn(Oct) 2 ) respectively as the macro-initiator and catalyst (Scheme 28). 54…”

Section: Tin Based Catalystsmentioning

confidence: 99%

Polybutylene succinate, a potential bio-degradable polymer: synthesis, copolymerization and bio-degradation

Savitha¹,

Paghadar

Kumar

et al. 2022

Polym. Chem.

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The Crystallization and Melting Behaviors of PDLA-b-PBS-b-PDLA Triblock Copolymers

Cited by 12 publications

References 55 publications

The Crystallization Behavior of Poly(l-lactic acid)/Poly(d-lactic acid) Electrospun Fibers: Effect of Distance of Isomeric Polymers

The Crystallization Behavior of Poly(l-lactic acid)/Poly(d-lactic acid) Electrospun Fibers: Effect of Distance of Isomeric Polymers

Targeted Copolymerization in Amorphous Regions for Constructing Crystallizable Functionalized Copolymers

Polybutylene succinate, a potential bio-degradable polymer: synthesis, copolymerization and bio-degradation

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