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Related Concept Videos

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Step-Growth Polymerization: Overview01:03

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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.
Many natural and synthetic polymers are produced by...

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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
09:37

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Published on: October 23, 2015

A New Strategy to Prepare Polymer-based Shape Memory Elastomers.

Shijie Song1, Jiachun Feng2, Peiyi Wu1

  • 1Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, 220 Handan Road, Shanghai 200433, P.R. China.

Macromolecular Rapid Communications
|July 28, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a new polymer-based shape memory elastomer using styrene-b-(ethylene-co-butylene)-b-styrene (SEBS) and paraffin. This novel method simplifies fabrication and enhances shape memory properties.

Keywords:
block copolymerscrystallizationelastomersphase separationstimuli-sensitive polymers

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Shape memory elastomers (SMEs) are advanced materials with the ability to recover their original shape when triggered.
  • Traditional methods for SME preparation can be complex and limit property optimization.

Purpose of the Study:

  • To propose a novel strategy for preparing polymer-based shape memory elastomers.
  • To investigate the use of styrene-b-(ethylene-co-butylene)-b-styrene (SEBS) and paraffin for creating SMEs.
  • To characterize the microstructures and shape memory properties of the synthesized SEBS/paraffin composites.

Main Methods:

  • Utilizing microphase separation of block copolymers and phase transition of small molecules.
  • Preparing SEBS/paraffin composites with varying paraffin loadings.
  • Characterizing microstructures using transmission electron microscopy, polarized light microscopy, and differential scanning calorimetry.

Main Results:

  • Paraffins preferentially swell the ethylene-butylene (EB) blocks of SEBS, acting as an effective switch phase.
  • Composites exhibited varied phase morphologies based on paraffin content.
  • Good shape fixing, shape recovery, and improved tensile properties were observed across a wide range of paraffin loadings.

Conclusions:

  • The proposed method offers a simplified and controllable approach for fabricating polymer-based shape memory elastomers.
  • This strategy allows for optimization of shape memory properties and tunable material rigidity/softness.
  • SEBS/paraffin composites represent a promising class of materials for shape memory applications.