4.6 Review

Recent advances in enhancing stereocomplexation between poly(lactide) enantiomeric chains

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Summary: Polylactide stereocomplexes are of great interest due to their unique properties and wide range of potential applications. In this study, non-covalent triblock terpolymers, consisting of polystyrene, stereocomplex polylactide, and polyisoprene, were synthesized through solution-precipitation method. The molecular characteristics and formation of the terpolymers were confirmed by various techniques.

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Compatibility and Thermal and Structural Properties of Poly(L-lactide)/Poly(L-co-D-lactide) Blends

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Melt and nucleation reinforcement for stereocomplex crystallites in poly (L-lactide)/lignin-grafted-poly(D-lactide) blend

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Tammann Analysis of the Molecular Weight Selection of Polymorphic Crystal Nucleation in Symmetric Racemic Poly(lactic acid) Blends

Yucheng He et al.

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Facile and efficient formation of stereocomplex polylactide fibers drawn at low temperatures

Wei Huang et al.

Summary: This study developed a method for preparing high molecular weight PLLA/PDLA blends containing stereo-block PLA copolymers through in-situ reactive melt-spinning. These blends exhibit exclusive SC-PLA crystallites, which greatly improve heat-resistance.

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Glassy Alfa-Relaxation Promotes Surprising Homo-Crystal Nucleation in the Low-Molar-Mass Enantiomeric Poly(lactic acid) Blend

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Fully Bio-Based and Supertough PLA Blends via a Novel Interlocking Strategy Combining Strong Dipolar Interactions and Stereocomplexation

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Competitive Mechanism of Stereocomplexes and Homocrystals in High-Performance Symmetric and Asymmetric Poly(lactic acid) Enantiomers: Qualitative Methods

Mingwei Guo et al.

Summary: The study reveals that molecular weight, crystallization temperature, chain length, and molar ratios play critical roles in the formation of stereocomplexes (SCs) in poly(lactic acid) (PLA). Multiple stereocomplexation is clear in asymmetric racemic blends when the molecular weight is over 6k but less than 41k, with more ordered SCs forming. However, in symmetric racemic blends, SCs and homocrystals (HCs) coexist when the molecular weight exceeds 41k, with multicomplexation restricting the formation of asymmetric enantiomers.

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A Novel Stereocomplex Poly(lactic acid) with Shish-Kebab Crystals and Bionic Surface Structures as Bioimplant Materials for Tissue Engineering Applications

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Thermal Properties and Structural Evolution of Poly(L-lactide)/Poly(D-lactide) Blends

Lidong Feng et al.

Summary: By investigating the thermal properties, morphology, and thermal stability of PLLA/PDLA blends, a new stereoamorphous mesophase (sam-PLA) structure was discovered, and the relationship between different phases in the PLLA/PDLA blends was explored.

MACROMOLECULES (2021)

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Two-Stage Crystallization Kinetics and Morphological Evolution with Stereocomplex Crystallite-Induced Enhancement for Long-Chain Branched Polylactide/Poly(D-lactic acid) Blends

Cui Xu et al.

Summary: In this study, long-chain branched polylactide (LCB PLA)/poly(D-lactic acid) (PDLA) blends with different low amounts of PDLA were prepared by a solution blending method. The formation of stereocomplex (SC) crystallites in the blends and their content increase with higher PDLA composition were confirmed through differential scanning calorimetry (DSC) and dynamic rheological frequency sweep. The morphological evolution during crystallization at 130 degrees C was traced by polarized optical microscopy (POM), revealing the separate growths of SC crystallites and PLA homocrystallites, and the crystallization kinetics were studied by rheometry, accelerated with increasing PDLA composition mainly due to nucleation density enhancement.

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Effect of Chain Length on Polymer Stereocomplexation: A Quantitative Study

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Summary: The study focuses on the precise control of two enantiomers in stereocomplexation with designed recipes. When the chain length of two enantiomers are exactly the same, they form highly uniform stereocomplexes with extended chain conformation.

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Pseudo-Polyrotaxane Stereocomplex with α-Cyclodextrin and Block Copolymers Using Poly(ethylene glycol) and Polylactide

JaeYeong Choi et al.

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Synthesis and Stereocomplexation of New Enantiomeric Stereo Periodical Copolymers Poly(L-lactic acid-L-lactic acid-D-lactic acid) and Poly(D-lactic acid-D-lactic acid-L-lactic acid)

Hideto Tsuji et al.

Summary: In this study, new enantiomeric stereo periodical copolymers of lactic acids were synthesized and a novel type of stereocomplex (SC) formation between these enantiomeric SPCPs was reported. The melting temperatures of SC crystallites of the blend were found to be between the alpha- and beta-forms of the homocrystallites, which is different from the results observed for enantiomeric poly(lactic acid) homopolymers. The findings suggest the possibility of widening the physical properties and biodegradation behavior of PLA-based materials through the synthesis and stereocomplexation of various types of SPCPs with different stereosequences.

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Role of Chain Entanglements in the Stereocomplex Crystallization between Poly(lactic acid) Enantiomers

Chenxuan Sun et al.

Summary: This study demonstrates the crucial role of chain entanglement in regulating stereocomplex (SC) crystallization of polymer enantiomers. Deentangling was shown to promote both the crystallization rate and crystallinity of SCs, providing deep insight into the SC crystallization mechanism of polymers and paving the way for future research in preparing SC materials.

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Polylactide Stereocomplexation Leads to Higher Hydrolytic Stability but More Acidic Hydrolysis Product Pattern

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