Related Experiment Video
Updated: Dec 10, 2025
09:37
Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
Published on: October 23, 2015
13.3K
Block Copolymers of Poly(ω-Pentadecalactone) in Segmented Polyurethanes: Novel Biodegradable Shape Memory
Katalin Czifrák1, Csilla Lakatos1, Marcell Árpád Kordován1
1Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary.
Polymers
|August 30, 2020
Summary
This study synthesized poly(ω-pentadecalactone) (PPDL) copolymers and incorporated them into polyurethanes (PUs). The resulting PUs exhibited excellent shape memory properties, demonstrating potential for advanced material applications.
Area of Science:
- Polymer Chemistry
- Materials Science
Background:
- Polyurethanes (PUs) are versatile polymers with diverse applications.
- Incorporating biodegradable polyesters can enhance PU properties.
- Poly(ω-pentadecalactone) (PPDL) offers potential for novel polymer architectures.
Purpose of the Study:
- To synthesize PPDL (co)polymers.
- To incorporate PPDL into polyurethanes (PUs).
- To evaluate the shape memory behavior of the resulting PUs.
Main Methods:
- Ring-opening polymerization (ROP) of ω-pentadecalactone (PDL) using dibutyltin dilaurate.
- Synthesis of linear and crosslinked PUs using poly(ε-caprolactone) (PCL) and 1,6-hexamethylenediisocyanate (HDI).
- Characterization via Attenuated Total Reflectance Fourier-Transform Infrared spectroscopy (AT-FTIR), differential scanning calorimetry (DSC), and dynamical mechanical analysis (DMA).
Main Results:
- Optimal ROP conditions for PDL were established.
- PPDL was successfully incorporated into PU matrices.
- DMA indicated a rubbery plateau, predicting shape memory behavior.
- The synthesized PUs demonstrated good shape fixity (Rf) and shape recovery (Rr) ratios.
Conclusions:
- PPDL can be effectively synthesized and incorporated into PUs.
- The resulting PUs possess significant shape memory capabilities.
- This work presents promising new materials for shape memory applications.
Keywords:
copolymerizationpoly(ω-pentadecalactone), polyurethane copolymersshape memoryω-pentadecalactoneMore Related Videos
12:07Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
Published on: April 16, 2018
13.9K
08:12Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
Published on: December 16, 2022
3.7K
Related Concept Videos
01:24Characteristics and Nomenclature of Copolymers
3.1K
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
3.1K
01:20Types of Step-Growth Polymers: Polyesters
2.5K
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 polymer...
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 polymer...
2.5K
01:03Step-Growth Polymerization: Overview
4.1K
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...
Many natural and synthetic polymers are produced by...
4.1K
01:14Polymer Classification: Architecture
3.5K
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...
3.5K
01:08Molecular Weight of Step-Growth Polymers
2.7K
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.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.7K
01:17Ziegler–Natta Chain-Growth Polymerization: Overview
3.7K
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...
3.7K