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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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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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.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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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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Polymer Classification: Architecture01:14

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Polymers: Molecular Weight Distribution01:10

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-indicating polymers: a pathway to intelligent materials.

Mobina Bayat1, Hanieh Mardani1, Hossein Roghani-Mamaqani1,2

  • 1Faculty of Polymer Engineering, Sahand University of Technology, P.O. Box: 51335-1996, Tabriz, Iran. r.mamaghani@sut.ac.ir.

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Self-indicating polymers are smart materials that change properties when stimulated. This review covers their mechanisms, like aggregation and phase transitions, and applications in sensing and smart devices.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Smart Materials

Background:

  • Self-indicating polymers are advanced materials exhibiting detectable property changes in response to external stimuli.
  • These materials offer unique functionalities for various technological applications.

Purpose of the Study:

  • To provide a comprehensive overview of the self-indication mechanisms in polymers.
  • To highlight the diverse applications of these responsive materials.

Main Methods:

  • Review of aggregation-based mechanisms.
  • Analysis of phase transition-induced self-indication.
  • Examination of bond cleavage, isomerization, charge transfer, and energy transfer mechanisms.

Main Results:

  • Identified key self-indication mechanisms including aggregation, phase transitions, bond cleavage, isomerization, charge transfer, and energy transfer.
  • Demonstrated how these mechanisms lead to observable property variations.
  • Highlighted applications in sensing, drug delivery, and wearable devices.

Conclusions:

  • Self-indicating polymers offer tunable properties and responsiveness, making them promising for biotechnology, materials science, and electronics.
  • Their diverse mechanisms and applications underscore their potential for future innovations.