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Characteristics and Nomenclature of Copolymers01:24

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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 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 conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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 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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Rod-coil block copolymer aggregates via polymerization-induced self-assembly.

Yisheng Lv1, Liquan Wang1, Fan Liu1

  • 1Shanghai Key Laboratory of Advanced Polymeric Materials, State Key Laboratory of Bioreactor Engineering, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China. slin@ecust.edu.cn lq_wang@ecust.edu.cn.

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|March 25, 2020
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Summary

Polymerization-induced self-assembly (PISA) of rod-coil block copolymers was simulated. Dissipative particle dynamics revealed how initiator length, rigid chain length, and reaction probability influence kinetics and self-assembly, aiding future research.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Computational Chemistry

Background:

  • Polymerization-induced self-assembly (PISA) efficiently creates nano-objects by combining polymerization and in situ self-assembly.
  • Cooperative polymerization and self-assembly in PISA systems, particularly those forming rigid chains, present challenges in understanding polymerization kinetics and aggregation behavior.

Purpose of the Study:

  • To explore the PISA behavior of rod-coil block copolymer systems using advanced simulation techniques.
  • To investigate the influence of key parameters such as initiator length, targeted rigid chain length, and reaction probability on PISA outcomes.
  • To elucidate the fundamental differences between PISA and traditional self-assembly processes.

Main Methods:

  • Utilized dissipative particle dynamics (DPD) simulations.
  • Employed a probability-based reaction model to simulate polymerization kinetics and self-assembly.
  • Examined rod-coil block copolymer systems under varying conditions.

Main Results:

  • The study successfully simulated PISA behavior in rod-coil block copolymer systems.
  • Key parameters influencing polymerization kinetics and self-assembly were identified and analyzed.
  • The simulation results demonstrated good agreement with experimental observations, validating the model's accuracy.

Conclusions:

  • The research provides a comprehensive understanding of the PISA process in rod-coil block copolymer systems.
  • The findings offer valuable insights into controlling polymerization kinetics and self-assembly for nano-object fabrication.
  • This work serves as a foundation for future experimental research in rod-coil PISA systems.