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Related Concept Videos

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

3.4K
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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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
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Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.7K
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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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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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.
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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Heating Rate Sensitive Multi-Shape Memory Polypropylene: A Predictive Material.

Robin Hoeher1, Thomas Raidt1, Frank Katzenberg1

  • 1Biomaterials and Polymer Science, Department of Biochemical and Chemical Engineering, TU Dortmund , 44221 Dortmund, Germany.

ACS Applied Materials & Interfaces
|May 21, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel predictive material that changes shape based on the rate of environmental changes, like heating speed. This smart material can forecast system failures, enhancing safety and reliability in various applications.

Keywords:
actuatorheating ratepredictive materialsensorshape memorysmart materials

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Smart Materials

Background:

  • Traditional smart materials respond to stimuli, but not the rate of change.
  • Predicting system failures is crucial for safety and reliability.

Purpose of the Study:

  • To introduce a novel
  • predictive material
  • capable of responding to the rate of environmental signal changes.
  • To demonstrate this material's capability using lightly cross-linked syndiotactic polypropylene.

Main Methods:

  • Investigated the response of lightly cross-linked syndiotactic polypropylene to varying heating rates.
  • Characterized the material's shape change adaptation in response to temperature increase rate.

Main Results:

  • The novel material demonstrated a specific response to the rate of temperature increase.
  • Shape change was directly correlated with the applied heating rate.

Conclusions:

  • Lightly cross-linked syndiotactic polypropylene functions as a predictive material.
  • This material can be utilized to predict system failures based on environmental signal rate changes.