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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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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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Hyperbranched polymers: growing richer in flavours with time.

Arun Kumar Gayen1, Runa Singla1, S Ramakrishnan1

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Hyperbranched polymers (HBPs) offer simple synthesis and unique globular structures. Their numerous functional groups enable diverse properties and applications as multifunctional scaffolds.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Hyperbranched polymers (HBPs) have been researched for over 30 years.
  • They possess unique globular structures and abundant peripheral functional groups.

Purpose of the Study:

  • To highlight unique structural features of HBPs and their influence on properties.
  • To discuss HBPs' versatility in creating functional polymeric systems.
  • To focus on HBPs as multifunctional scaffolds utilizing terminal groups.

Main Methods:

  • Review of existing literature on HBPs.
  • Analysis of structure-property relationships in HBPs.
  • Comparison of functionalized HBPs with complex polymeric systems.

Main Results:

  • HBPs exhibit tunable properties based on their structure and peripheral groups.
  • Their adaptability allows for the creation of advanced functional materials.
  • Peripheral functionalization is key to their utility as scaffolds.

Conclusions:

  • HBPs offer a versatile platform for developing novel materials.
  • A structuro-functional analogy can be drawn between HBPs and more complex polymers.
  • This review aims to inspire further development of HBP applications.