Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

580
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
580
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

515
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
515
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.8K
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...
4.8K
Plastic Behavior01:21

Plastic Behavior

812
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
812
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

3.8K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
3.8K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.7K
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...
2.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Extending the pH Stability of Poly(2-Oxazoline)/Poly(Acrylic Acid) Double-Network Hydrogels by Including Acrylamide as Comonomer.

Macromolecular rapid communications·2025
Same author

Heating Rate Sensitive Polyethylene Terephthalate.

Macromolecular rapid communications·2024
Same author

Controlling the function of bioactive worm micelles by enzyme-cleavable non-covalent inter-assembly cross-linking.

Journal of controlled release : official journal of the Controlled Release Society·2024
Same author

Amphiphilic Polymer Conetworks Based on End-Linked "Core-First" Star Block Copolymers: Structure Formation with Long-Range Order.

ACS macro letters·2022
Same author

Conjugates of Ciprofloxacin and Amphiphilic Block Copoly(2-alkyl-2-oxazolines)s Overcome Efflux Pumps and Are Active against CIP-Resistant Bacteria.

Molecular pharmaceutics·2021
Same author

Full Thermal Switching of Enzymes by Thermoresponsive Poly(2-oxazoline)-Based Enzyme Inhibitors.

Chemistry (Weinheim an der Bergstrasse, Germany)·2020

Related Experiment Video

Updated: Apr 19, 2026

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
11:17

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

23.6K

Programming of shape memory natural rubber for near-discrete shape transitions.

Dominik Quitmann1, Frauke M Reinders, Benjamin Heuwers

  • 1Chair of Biomaterials & Polymer Science, Department of Biochemical & Chemical Engineering, TU Dortmund , D-44221 Dortmund, Germany.

ACS Applied Materials & Interfaces
|December 24, 2014
PubMed
Summary

Cold-programmed shape memory natural rubber (SMNR) exhibits a narrow 1 K transition range, recovering over 80% of its original shape. Trigger points are tunable via aging or solvent vapor treatment, enabling programming of higher cross-linked natural rubber.

Keywords:
SMNRagingcold-programmingnarrow shape-transitionshape memory

More Related Videos

Shape Memory Polymers for Active Cell Culture
10:53

Shape Memory Polymers for Active Cell Culture

Published on: July 4, 2011

14.1K
Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
09:37

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

Published on: October 23, 2015

13.6K

Related Experiment Videos

Last Updated: Apr 19, 2026

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
11:17

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

23.6K
Shape Memory Polymers for Active Cell Culture
10:53

Shape Memory Polymers for Active Cell Culture

Published on: July 4, 2011

14.1K
Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
09:37

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

Published on: October 23, 2015

13.6K

Area of Science:

  • Materials Science
  • Polymer Science

Background:

  • Traditional shape memory polymers require high-temperature programming and exhibit broad shape transition ranges.
  • Shape memory natural rubber (SMNR) offers a promising alternative with cold-programming capabilities.

Purpose of the Study:

  • To investigate methods for enhancing the trigger point of cold-programmed SMNR while maintaining its narrow transition range.
  • To explore the effects of aging and solvent vapor treatment on SMNR programming.

Main Methods:

  • Cold-programming of shape memory natural rubber (SMNR).
  • Inducing shape recovery within a narrow temperature range (1 K).
  • Investigating the influence of aging on the trigger point.
  • Accelerating trigger point increase using nonaffine and affine solvent vapors.

Main Results:

  • SMNR recovers over 80% of its original shape within a 1 K temperature range.
  • Aging stretched SMNR increases the trigger point without broadening the transition.
  • Treatment with nonaffine solvent vapors accelerates the trigger point increase.
  • Affine solvent vapors at low concentrations yield higher trigger points than aging.

Conclusions:

  • Cold-programming of SMNR is feasible with a narrow transition range.
  • Aging and solvent vapor treatments effectively increase the trigger point of SMNR.
  • This methodology allows for the cold-programming of even higher cross-linked natural rubber.