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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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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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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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Drawing and Hydrophobicity-patterning Long Polydimethylsiloxane Silicone Filaments
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Shape memory polymers with silicon-containing segments.

Cody Alan Schoener1, Christopher Bell Weyand1, Ranjini Murthy1

  • 1Department of Biomedical Engineering, Texas A&M University, 3120 TAMU, College Station, TX, USA. mgrunlan@tamu.edu; ; Tel: +1 979 845 2406.

Journal of Materials Chemistry
|October 10, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed novel inorganic-organic shape memory polymers using silicon-containing polydimethylsiloxane (PDMS) and poly(ε-caprolactone) (PCL). These advanced materials exhibit excellent shape memory properties for diverse applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Smart Materials

Background:

  • Thermoresponsive shape memory polymers (SMPs) are stimuli-responsive materials that change shape with temperature.
  • Existing SMPs are predominantly organic, limiting their application range.
  • There is a need for novel SMPs with enhanced properties and broader applicability.

Purpose of the Study:

  • To develop novel inorganic-organic SMPs by combining polydimethylsiloxane (PDMS) and poly(ε-caprolactone) (PCL) segments.
  • To investigate the influence of tailored PCL segment lengths on material properties.
  • To evaluate the mechanical properties, shape fixity, and shape recovery of the developed SMPs.

Main Methods:

  • Synthesis of diacrylated PCL-block-PDMS-block-PCL macromers with varying PCL segment lengths.
  • Photochemical curing to form polymer networks.
  • Characterization of mechanical properties, shape fixity, and shape recovery.

Main Results:

  • Successful synthesis of inorganic-organic SMPs incorporating PDMS and PCL segments.
  • PDMS served as an effective soft segment due to its low glass transition temperature (Tg).
  • The developed networks demonstrated excellent mechanical properties, shape fixity, and shape recovery.

Conclusions:

  • Novel inorganic-organic SMPs were successfully fabricated using PDMS and PCL.
  • These SMPs exhibit promising properties for smart material applications.
  • The combination of PDMS and PCL offers a versatile platform for advanced shape memory polymer development.