Quasi block copolymers noncovalent bonded by stereocomplex crystals

Wu, Jiali; Chen, Yihang; Wang, Hengti; Li, Yongjin

doi:10.1016/j.giant.2023.100150

Cited by 6 publications

(3 citation statements)

References 67 publications

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“…63,64 SCDSA of block or graft copolymers with chemically different coil (amorphous) blocks has only scarcely been investigated and was employed for example for the preparation of non-covalent block copolymers or micelles with a mixed, thermo-responsive corona, respectively. [65][66][67][68] Herein, we report on the application of patchy spherical SC micelles as efficient compatibilizers in immiscible PS/PtBMA polymer blends (Scheme 1). The improvement and up-scaling of the preparation method for the patchy SC micelle dispersions as well as the influence of corona chemistry ( patchy vs. homogeneous corona) of the employed SC micelles and the compatibilizer content on the blend morphology will be addressed.…”

Section: Introductionmentioning

confidence: 99%

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Patchy stereocomplex micelles as efficient compatibilizers for polymer blends

Schaller,

Schmidt,

Schweimer

et al. 2024

Polym. Chem.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Patchy stereocomplex micelles as efficient compatibilizers for polymer blends

Schaller,

Schmidt,

Schweimer

et al. 2024

Polym. Chem.

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“…We have recently demonstrated that polymer chains with converse chirality could be incorporated into connecting distinct polymer chains to create quasi block polymer in which the stereo cocrystallization offers the unique “solid” linkage arising from the respective intermolecular interactions. , It is worth noting that stereocomplex crystal (SC), formed via multiple H-bonding between enantiomers with complementary configurations, − have the advantages of high melting point, high modulus, good heat resistance against severe processing conditions. − We are interested in investigating the particularity of SC on formation of covalent adaptable networks within the elastomer during melt-processing that we postulated would be disintegrated upon higher temperature to potentially deliver elastomers with balanced recyclability and mechanical properties unseen in conventional cross-linked elastomer.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Physical Cross-Linking and Mechanical Strengthening of Elastomers by Enantiomeric Interactions through Reactive Processing

Chen,

Ling,

et al. 2023

ACS Appl. Polym. Mater.

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Exploiting robust elastomers without sacrificing thermoplasticity has been extremely desired for decades, yet it is challenging. Noncovalent interactions are a versatile platform for the development of networks with reversible cross-linking joints. Herein, an alternative strategy is proposed to straightforwardly construct a mechanical strengthening elastomer with a dynamic cross-linking network via multiple H-bonding between enantiomeric polymer pairs. First, poly-L-lactic acid (PLLA)/poly-D-lactic acid (PDLA) were pregrafted onto polyolefin elastomer (POE) to obtain POE-g-PLLA and POE-g-PDLA, respectively. Due to the specific intermolecular interactions, stereocomplex crystals (SC) were formed and preserved during the subsequent melt-compounding. SC enabled the immobilization of the cross-linking point within the POE matrix, facilitating the construction of the SC noncovalent network (SC-N). As such, SC-N endowed the elastomer with synergistically enhanced modulus, strength, and heat resistance, as compared with traditional chemical cross-linked counterparts. More importantly, SC-N displayed desirable reprocessability upon the temporary dissociation of physical cross-linking linkages above T m,SC . These findings may open a feasible avenue of designing advanced elastomers with dynamic behaviors and provide deeper insights into the underlying mechanism of covalent adaptable cross-linking.

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