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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

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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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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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Anionic Chain-Growth Polymerization: Mechanism01:04

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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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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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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Related Experiment Video

Updated: Aug 23, 2025

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Harnessing molecular isomerization in polymer gels for sequential logic encryption and anticounterfeiting.

Yu Dong1,2,3, Yao Ling1,2,3, Donghui Wang1,2,3

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.

Science Advances
|November 2, 2022
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Summary

Researchers developed new multiresponsive donor-acceptor Stenhouse adducts (DASAs) for advanced data encryption. These materials use sequential logic encryption (SLE), mimicking digital circuits to prevent trial-and-error attacks and enhance security.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Information Security

Background:

  • Inspired by natural camouflage, synthetic stimuli-responsive materials are explored for data encryption and anticounterfeiting.
  • Existing optical data-encryption materials often lack robust security features against sophisticated attacks.

Purpose of the Study:

  • To develop novel multiresponsive donor-acceptor Stenhouse adducts (DASAs) for advanced data encryption.
  • To engineer materials capable of sequential logic encryption (SLE) for enhanced security against unauthorized access.

Main Methods:

  • Synthesized a series of multiresponsive DASAs.
  • Utilized diamine conformational locking and substrate free-volume engineering for controlled reversibility.
  • Implemented a DASA gel-based system for sequential logic encryption.

Main Results:

  • Demonstrated unprecedented switching behavior and controlled reversibility in DASAs.
  • Successfully implemented sequential logic encryption (SLE), where output depends on input sequence.
  • Showcased the system's ability to generate substantial fake information upon incorrect input sequences, deterring attackers.

Conclusions:

  • The developed DASAs offer new design concepts for advanced data-encryption materials.
  • Sequential logic encryption (SLE) provides a novel approach for data security beyond traditional digital circuits.
  • This research paves the way for more secure and robust anticounterfeiting and data protection technologies.