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Related Concept Videos

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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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Polymer Classification: Stereospecificity01:26

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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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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.
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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 Poly(propylene oxide): A Multifunctional Backbone-Thermoresponsive Polyether Polyol Copolymer.

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Thermoresponsive hyperbranched polyether polyols were synthesized. Adjusting the comonomer ratio controls hydroxyl end groups and lower critical solution temperature (LCST) for tunable polymer properties.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Hyperbranched polymers offer unique properties due to their complex architecture.
  • Thermoresponsive polymers exhibit a reversible change in solubility with temperature.
  • Polyether polyols are versatile building blocks in polymer synthesis.

Purpose of the Study:

  • To synthesize novel backbone-thermoresponsive hyperbranched polyether polyols.
  • To investigate the influence of comonomer ratio on polymer characteristics.
  • To establish a facile method for tuning lower critical solution temperature (LCST) and functionality.

Main Methods:

  • Anionic ring-opening copolymerization of glycidol and propylene oxide.
  • Controlled variation of comonomer ratios.
  • Characterization of molecular weight and thermal properties.

Main Results:

  • Successfully synthesized hyperbranched polyether polyols with molecular weights ranging from 1200-2000 g/mol.
  • Demonstrated tunability of the number of functional hydroxyl end groups.
  • Achieved adjustable lower critical solution temperatures (LCST) between 24 and 83 °C.
  • Developed a convenient one-step synthesis method.

Conclusions:

  • Backbone-thermoresponsive hyperbranched polyether polyols can be efficiently synthesized.
  • The comonomer ratio is a key parameter for controlling polymer architecture and thermoresponsive behavior.
  • These polymers offer tunable properties for potential applications in smart materials.