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Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Stiffening Organic Crystals through Polymerization Using Visible Light.

Linfeng Lan1,2, Yuxing Zhou1, Liang Li3,4

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Researchers developed a photopolymerization method to create strong and tough soft organic crystals. This process enhances mechanical properties, making them suitable for advanced flexible electronics and bioinspired devices.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Crystallography

Background:

  • Soft organic crystals are crucial for flexible electronics and bioinspired devices.
  • Achieving high strength and toughness simultaneously in these materials is challenging.
  • Existing materials often compromise one property for the other.

Purpose of the Study:

  • To develop a method for creating soft organic crystals with enhanced strength and toughness.
  • To investigate the single-crystal-to-single-crystal photopolymerization of a specific organic molecule.
  • To characterize the mechanical and structural changes during the photopolymerization process.

Main Methods:

  • Visible-light-driven single-crystal-to-single-crystal photopolymerization of 1,1'-dioxo-1H,1'H-[2,2'-biindene]-3,3'-diyl-bis(decanoate) (B10).
  • Characterization of the resulting polymeric crystal (PB10) using mechanical testing and structural analysis.
  • Irradiation of B10 crystals with white light (2.5 W cm⁻²).

Main Results:

  • Photopolymerization of B10 into PB10 enhances mechanical strength and toughness.
  • Visible light irradiation induced visible changes in crystal morphology (splitting, coiling, straightening) and color.
  • Molecular reorganization occurred, replacing weak π···π stacking with stronger C-C bonds.
  • PB10 crystals exhibited a transition from purely elastic to elastic/plastic behavior.
  • A 228-fold increase in toughness and an 81-fold increase in tensile toughness were observed.
  • PB10 crystals demonstrated a load-bearing capacity exceeding 1 × 10⁵ times their own mass.

Conclusions:

  • Visible-light-driven photopolymerization is an effective method to simultaneously enhance strength and toughness in soft organic crystals.
  • The developed method offers a pathway to novel materials for flexible electronics and bioinspired applications.
  • The significant improvements in mechanical properties open new possibilities for load-bearing soft materials.