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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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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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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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Polyolefin Thermoplastics for Multiple Shape and Reversible Shape Memory.

Yuan Gao1, Weifeng Liu1,2, Shiping Zhu1

  • 1Department of Chemical Engineering, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4L7, Canada.

ACS Applied Materials & Interfaces
|January 17, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel thermoplastic polyolefin with a reversible shape memory effect (RSME) without chemical cross-linking. This hydrocarbon material exhibits both one-way and two-way shape memory behaviors, achieved through precise chain microstructure design.

Keywords:
POEdiblock copolymersone-way shape memory polymerspolyolefin elastomersreversible shape memory polymersthermoplastics

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Shape memory polymers (SMPs) typically require chemical cross-linking for reversible shape memory effects.
  • Pure hydrocarbon thermoplastic polyolefins have not previously exhibited reversible shape memory effects.

Purpose of the Study:

  • To synthesize a pure hydrocarbon thermoplastic polyolefin with a reversible shape memory effect (RSME).
  • To investigate the mechanism behind the RSME in the absence of chemical cross-linking.

Main Methods:

  • Synthesis of a thermoplastic ethylene/1-octene diblock copolymer with a tailored chain microstructure.
  • Characterization of the material's shape memory properties, including one-way and two-way effects.
  • Analysis of the mechanism responsible for the reversible shape memory effect.

Main Results:

  • The synthesized polyolefin demonstrated a reversible shape memory effect (RSME) under minimal loading conditions.
  • The material exhibited conventional one-way multishape memory effects alongside the novel two-way RSME.
  • Oriented crystallization induced by heating was identified as the mechanism driving the RSME, without chemical cross-linking.

Conclusions:

  • A pure hydrocarbon thermoplastic polyolefin with RSME has been successfully developed.
  • The design of the polymer's chain microstructure is crucial for achieving thermoplastic reversible shape memory.
  • This breakthrough opens possibilities for advanced shape memory applications using hydrocarbon-based polymers.