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Characteristics and Nomenclature of Copolymers

Characteristics and Nomenclature of Copolymers

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...

Step-Growth Polymerization: Overview

Step-Growth Polymerization: Overview

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...

Cationic Chain-Growth Polymerization: Mechanism

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...

Polymer Classification: Stereospecificity

Polymer Classification: Stereospecificity

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...

Molecular Weight of Step-Growth Polymers

Molecular Weight of Step-Growth Polymers

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...

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

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Published on: October 23, 2015

Development of zwitterionic copolymers with multi-shape memory effects and moisture-sensitive shape memory effects.

Shaojun Chen¹, Funian Mo, Florian J Stadler

¹Shenzhen Key Laboratory of Special Functional Materials, Nanshan District Key Lab for Biopolymers and Safety Evaluation, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China. chensj@szu.edu.cn.

Journal of Materials Chemistry. B

|April 9, 2020

Summary

Researchers developed novel zwitterionic polymers with multi-shape memory effects (SME). These smart materials exhibit both thermally-induced and moisture-sensitive shape recovery, paving the way for advanced biomedical applications.

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Area of Science:

Polymer Science
Biomaterials Engineering
Materials Chemistry

Background:

Shape memory polymers (SMPs) and zwitterionic polymers offer significant potential in biomedical applications.
Combining these functionalities can lead to advanced smart materials.

Purpose of the Study:

To synthesize and characterize novel zwitterionic copolymers with multi-shape memory effects (SME).
To investigate the moisture-sensitive SME of these new polymers.
To explore their potential in smart biomedical fields.

Main Methods:

Synthesis of zwitterionic multi-SMPs (p(DMAPS-co-AA)) via copolymerization of DMAPS and acrylic acid (AA).
Characterization of the micro-phase separated structure.
Shape memory effect testing, including thermally-induced and moisture-sensitive evaluations.

Main Results:

Successfully synthesized zwitterionic multi-SMPs (p(DMAPS-co-AA)) exhibiting micro-phase separation.
Demonstrated dual, triple, and quadruple shape memory effects (SME) attributed to hydrogen bonding and electrostatic interactions.
Observed moisture-sensitive SME in addition to thermally-induced SME.

Conclusions:

The developed zwitterionic multi-SMPs possess versatile shape memory properties.
The combination of zwitterionic characteristics and multi-SME opens new avenues for smart biomedical devices.
These materials show promise for advanced applications requiring responsive and programmable shape changes.