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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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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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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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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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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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Trends in non-isocyanate polyurethane (NIPU) development.

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials Science
  • Green Chemistry

Background:

  • Growing demand for safer, sustainable polymers drives research into non-isocyanate polyurethanes (NIPUs).
  • NIPUs derived from biobased cyclic carbonates and amines present a renewable pathway.
  • Conventional polyurethanes (PU) rely on hazardous isocyanates, prompting the search for alternatives.

Purpose of the Study:

  • To review opportunities and limitations of NIPUs as replacements for conventional PU.
  • To highlight advances in overcoming NIPU performance challenges.
  • To suggest future research directions for industrial NIPU adoption.

Main Methods:

  • Perspective review of existing academic literature on NIPUs.
  • Analysis of NIPU synthesis via biobased cyclic carbonates and amines.
  • Comparative assessment of NIPU properties against conventional PU.

Main Results:

  • NIPUs show promise for renewable materials but face challenges in direct replacement of PU.
  • Market penetration of NIPUs is currently negligible due to performance gaps.
  • Significant research advances have been made to address NIPU limitations.

Conclusions:

  • Bridging the performance gap between NIPUs and conventional PU is crucial for market viability.
  • Further research is needed to transition NIPU technology from academia to industry.
  • Targeted research efforts can accelerate the adoption of sustainable NIPU materials.