Journal
ACS MACRO LETTERS
Volume 12, Issue 3, Pages 369-375Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.2c00753
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We demonstrate a bottom-up strategy for achieving helical crystals by chiral amplification in copolyesters through the incorporation of a small amount of (D)-isosorbide. The molecular chirality of isosorbide is transferred to the crystal chirality of poly(ethylene brassylate) and amplified by the formation of right-handed helical crystals. Increasing isosorbide content or reducing crystallization temperature leads to thinner PEB lamellae crystals, enhancing chiral amplification and improving the mechanical properties of aliphatic copolyesters.
We demonstrate herein a bottom-up strategy for achieving helical crystals via chiral amplification in copolyesters by incorporating a small amount of (D)-isosorbide into semicrystalline polyester, poly(ethylene brassylate) (PEB). During bulk crystallization of poly(ethylene-co-isosorbide brassylate)s, the molecular chirality of isosorbide in the amorphous region is transferred to PEB crystal chirality and amplified by the formation of right-handed helical crystals. Increasing isosorbide content or reducing crystallization temperature leads to thinner PEB lamellae crystals, strengthening chiral amplification by forming superhelices with a smaller helical pitch. Moreover, the superhelices with smaller helical pitch (larger chiral amplification) endow aliphatic copolyesters with enhanced modulus, strength, and toughness without sacrificing elongation-at-break. The principle outlined here could apply to the design of strong and tough materials.
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