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Related Concept Videos

Polymers02:34

Polymers

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Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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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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Types of Step-Growth Polymers: Polyesters01:20

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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.
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...
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Polymers: Molecular Weight Distribution01:10

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Olefin Metathesis Polymerization: Overview01:13

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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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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Core-shell nano-latex blending method to prepare multi-shape memory polymers.

Hongze Li1, Yingwu Luo, Xiang Gao

  • 1The State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, China. gaox@zju.edu.cn.

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|July 12, 2017
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Researchers developed multi-shape memory polymers using tailored triblock copolymer nano-latexes. These advanced materials exhibit quadruple-shape memory effects and tunable performance, offering significant potential for smart applications.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Nanotechnology

Background:

  • Developing polymers with multiple shape memory effects is crucial for advanced applications.
  • Controlling nanophase structure and transition temperatures is key to achieving multi-shape memory behavior.

Purpose of the Study:

  • To synthesize and characterize multi-shape memory polymers with tunable properties.
  • To investigate the relationship between polymer structure, blending ratios, and shape memory performance.

Main Methods:

  • Utilized reversible addition-fragmentation chain transfer (RAFT) emulsion polymerization to create core-shell triblock copolymer nano-latexes.
  • Blended various nano-latexes with styrene-random-methacrylate cores and polystyrene shells to form a crosslinked network.
  • Investigated the influence of styrene/methacrylate ratios and blending ratios on material properties.

Main Results:

  • Achieved a polymer with well-distributed multiple nanophases exhibiting quadruple-shape memory behavior.
  • Demonstrated that shape memory and recovery performance can be optimized by adjusting blending ratios.
  • Obtained an optimized polymer with shape memory and recovery ratios exceeding 80% across all transition temperatures.

Conclusions:

  • The developed RAFT-synthesized triblock copolymer nano-latexes provide a versatile platform for creating multi-shape memory polymers.
  • The core-shell structure and controlled blending enable the formation of a stable crosslinked network with multiple transition phases.
  • This approach allows for the fine-tuning of shape memory performance, achieving high efficiency at various temperatures.