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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Physical Properties of Carboxylic Acids01:31

Physical Properties of Carboxylic Acids

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Carboxylic acids with lower molecular weight exhibit a sharp and unpleasant odor. They also have higher boiling and melting points than analogous compounds, such as aldehydes, ketones, and alcohols.
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Hydrogen Bonds01:04

Hydrogen Bonds

11.9K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Hydrogen Bonds00:26

Hydrogen Bonds

109.5K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Hydrogen-bonded aggregates in precise acid copolymers.

Christopher A Lueth1, Dan S Bolintineanu2, Mark J Stevens2

  • 1Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.

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|February 12, 2014
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Molecular dynamics simulations reveal that acid group aggregation in precise acid copolymers is driven by hydrogen bonding. Aggregate spacing depends on spacer length, not acid type, influencing PEAA and PESA copolymer structures.

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Area of Science:

  • Polymer Science and Engineering
  • Materials Chemistry
  • Computational Materials Science

Background:

  • Precise acid copolymers, including poly(ethylene-co-acrylic acid) (PEAA) and poly(ethylene-co-sulfonic acid) (PESA), are crucial in various applications.
  • Understanding the self-assembly behavior of these copolymers, particularly the role of acid group aggregation, is essential for tailoring their properties.

Purpose of the Study:

  • To investigate the aggregation behavior of acid groups in PEAA and PESA copolymers using atomistic molecular dynamics simulations.
  • To elucidate the influence of acid group type and spacing on the formation and structure of aggregates.
  • To correlate simulation findings with experimental X-ray scattering data.

Main Methods:

  • Atomistic molecular dynamics simulations were performed on melts of four precise acid copolymers.
  • Two PEAA and two PESA copolymers with acid groups spaced by 9 or 21 carbons were simulated.
  • Structure factors were calculated and compared with experimental X-ray scattering data.

Main Results:

  • Hydrogen bonding drives the formation of acid group aggregates in both PEAA and PESA copolymers.
  • A low wavevector peak in structure factors, attributed to these aggregates, aligns with X-ray scattering data for PEAA.
  • Aggregate spacing is primarily determined by the spacer length (9 or 21 carbons) and is similar for PEAA and PESA.
  • PEAA copolymers form more small aggregates (dimers), while PESA copolymers exhibit more free acid groups and larger aggregates.

Conclusions:

  • The nature of the acid group (acrylic vs. sulfonic) influences the distribution of aggregate sizes, not the fundamental spacing.
  • Molecular dynamics simulations provide valuable insights into the structure-property relationships of precise acid copolymers.
  • Findings contribute to the design and application of functional polymers based on controlled acid group aggregation.