Accelerating the self-repair rate of a polymer via acoustic energy

2011 ◽  
Author(s):  
Alexander J. Cushman ◽  
Brian C. Fehrman ◽  
Umesh A. Korde
Keyword(s):  
Acoustic Energy ◽  
The Self ◽  
Repair Rate ◽  
Self Repair

scholarly journals Analysis on Factors Affecting the Self-Repair Capability of SMA Wire Concrete Beam

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Li Sun ◽  
Dezhi Liang ◽  
Qianqian Gao ◽  
Jianhong Zhou
Keyword(s):  
Concrete Beam ◽  
Cement Mortar ◽  
Resin Cement ◽  
The Self ◽  
Factors Affecting ◽  
Advantages And Disadvantages ◽  
Crack Repair ◽  
Self Repair ◽  
Unbonded Length ◽  
Silicone Polymer

Crack expansion of concrete is the initial damage stage of structures, which may cause greater damage to structures subject to long-term loads or under extreme conditions. In recent years, the application of intelligent materials to crack self-repair has become a hotspot among researchers. In order to study the influence of factors on the self-repair capability of shape memory alloy (SMA) wire concrete beam, both theoretical and experimental methods were employed for analysis. For the convenience of experiment, composite materials (epoxy cement mortar and silicone polymer clay) instead of concrete were used. The SMA wires were externally installed on and internally embedded in epoxy resin cement mortar beams and silicone polymer clay beams. Comparison of crack repair situation between two installation methods turns out that both methods possess their own advantages and disadvantages and should be employed according to the actual situation. The influence of unbonded length on the self-repair capability of embedded type SMA wire beams and the necessary minimum unbonded length to achieve self-repair function were studied. The results state clearly that the longer the unbonded length is, the better the crack repair situation is.

scholarly journals Mechanism of Thermochromic and Self-Repairing of Waterborne Wood Coatings by Synergistic Action of Waterborne Acrylic Microcapsules and Fluorane Microcapsules

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 56
Author(s):  
Xiaoxing Yan ◽  
Wenting Zhao ◽  
Lin Wang
Keyword(s):  
Color Change ◽  
Acrylic Resin ◽  
Synergistic Action ◽  
The Self ◽  
Coating Film ◽  
Repair Rate ◽  
Waterborne Coatings ◽  
Comprehensive Properties ◽  
Wood Coatings ◽  
Dual Functions

The fluorane thermochromic microcapsules and waterborne acrylic resin microcapsules were added into waterborne coatings at the same time to prepare intelligent waterborne coating film with dual functions of color change and self-repairing. The coating film prepared by adding 15.0% fluorane microcapsules and 5.0% waterborne acrylic resin microcapsules to the primer at the same time had better comprehensive properties. At this time, the coating film changed from yellow to colorless. The repair rate of the coating film was 58.4%. When the temperature was lower than 32 °C, waterborne acrylic resin microcapsules can improve the thermochromic performance of the coating film with fluorane microcapsules. Waterborne acrylic resin microcapsules can alleviate the color change of coating film with fluorane microcapsules. The fluorane microcapsules can improve the self-repairing performance of coating film with waterborne acrylic resin microcapsules. The results lay a theoretical and technical foundation for multifunctional coating film.

scholarly journals Room-Temperature Self-Healing Elastomer based on Van der Waals Forces in Air and under Water

2021 ◽  
Vol 2083 (2) ◽  
pp. 022066
Author(s):  
Pengying Niu ◽  
Beibei Liu ◽  
Huanjun Li
Keyword(s):  
Room Temperature ◽  
Van Der Waals ◽  
Strong Acid ◽  
Van Der Waals Forces ◽  
The Self ◽  
Self Healing ◽  
Wearable Electronic ◽  
Self Repair ◽  
High Humidity Environment ◽  
Wearable Electronic Devices

Abstract With the development of flexible wearable electronic devices, researches on self-healing conductive materials have become prevalent. However, the self-healing performance of most conductive self-healing materials is commonly achieved by the external stimulus that may cause damage to the equipment. Pparticularly, these self-healing materials may lose the self-healing properties when exposed to a high-humidity environment. Here, we adopted two hydrophobic monomers (2-methoxyethyl acrylate and ethyl methacrylate) to obtain a self-healing elastomer that could display self-healing properties in air or under water though van der Waals forces. The quality and mechanical properties of the elastomer material could keep stable after stored under water for half a month. This elastomer material was capable of self-healing in different environments with self-repair efficiencies more than 50% in deionized water, strong acid solution and strong alkaline solution. The self-repair efficiencies were up to 77% at room temperature(T=25°C) and 64% at low temperature (T=-20°C) in air.

Study on Tribology Characteristic of the Cast Iron Friction Pair in the Self-Repairing Additive and Mechanism Analyzing

2011 ◽  
Vol 239-242 ◽  
pp. 1896-1900
Author(s):  
Yan Hong Yan ◽  
Yu Lin Yang ◽  
Nan Wang
Keyword(s):  
Cast Iron ◽  
Friction Pair ◽  
Testing Machine ◽  
Great Influence ◽  
The Self ◽  
Wear Testing ◽  
Wear Characteristics ◽  
Remarkable Effect ◽  
Frictional Wear ◽  
Self Repair

Influence of frictional wear characteristics of the cast iron-cast iron friction pair were investigated in the Self-repairing Additive with different concentration by using MMU-5G end-face friction and wear testing machine. The capability of generating self-repair coatings on the cast iron tribo-surface was verified in the Self-repairing Additive. The surface images of friction pair and their chemical composition were detected by using SEM and EDS. The result indicates different concentration has a great influence on frictional wear characteristics of friction pair in the Self-repairing Additive. In the self-repairing Additive, the Self-repair coatings are not formed on the cast-iron worn surface; self-repairing Additive has remarkable effect on antifriction and wearing of cast iron.

scholarly journals On the Self‐Repair of WS 2 /a‐C Tribocoating

2019 ◽  
Vol 7 (1) ◽  
pp. 1900938 ◽  
Author(s):  
Huatang Cao ◽  
Feng Wen ◽  
Jeff Th. M. De Hosson ◽  
Yutao Pei
Keyword(s):  
The Self ◽  
Self Repair

scholarly journals AN ANALYSIS ON THE SELF-INITIATION SELF REPAIR STRATEGIES OF THE THIRD SEMESTER STUDENTS OF ENGLISH STUDY PROGRAM IN THE ORAL INTERACTION WITH THEIR LECTURER AT WIDYA MANDIRA CATHOLIC UNIVERSITY KUPANG IN ACADEMIC

2020 ◽  
Vol 5 (12) ◽  
pp. 311-317
Author(s):  
Maria Wihelmina Wisrance
Keyword(s):  
Qualitative Method ◽  
Theoretical Framework ◽  
The Self ◽  
Study Program ◽  
The Third ◽  
Catholic University ◽  
Self Repair ◽  
Oral Interaction ◽  
The Way

This article studies self-initiation self-repair employed by the third semester students of English study program of Widya Mandira catholic university Kupang on speaking class, aims at finding out whether or not the third semester students of English study program do the self-repair initiation toward the trouble source they produce on the interaction they are engaged. The main purposes are to discover the types of trouble source that trigger the students’ self-initiation self-repair, the self-repair strategies performed by the students on the interaction with their lecturer, and identify the way how the students produce the self-initiation self-repair. The qualitative method and CA approach were employed as a theoretical framework. The results indicated that; types of trouble sources that trigger students’ self-initiation self-repair in the interaction with their lecturer on speaking class were vocabulary, pronunciation, and grammar. The self-initiation self-repair strategies performed by the students in their interaction with their lecturer on the speaking class were replacement, partial repetition of pronunciation, completion, correction, repetition by modifying intonation, modification, and rearranging. The self-initiation self-repair strategies are done in six ways namely repeating, replacing, modifying, correcting, completing, and rearranging.

Evaluation and Analysis for the Surface Morphology and Mechanism Properties of the Self-Repair Microcapsule

2008 ◽  
Vol 373-374 ◽  
pp. 714-717 ◽  
Author(s):  
Yi Xin ◽  
Wei Zhang ◽  
Shu Zhang ◽  
Bin Shi Xu
Keyword(s):  
Epoxy Resin ◽  
Shell Thickness ◽  
Indentation Test ◽  
The Self ◽  
Linear Viscoelastic Material ◽  
Non Linear ◽  
The Matrix ◽  
Linear Viscoelastic ◽  
Self Repair ◽  
Average Size

The surface configuration, the size and the shell thickness of the microcapsule were investigated. The average size and shell thickness were 100-200μm and 10nm separately. The mechanism performance of the microcapsule was tested by Nano Indentation Test. The results showed that the shell material—UF behaved as a non-linear viscoelastic material that different from the macroscopical performance. Analyzed and computed the un-load curves by non-linear simulation, the results showed that Educed Modulus of the microcapsule was 8.201GPa, which was a little lower than that of the epoxy resin 9.26GPa. And it also proved that the self-repair microcapsule in the epoxy resin dope would break as the microcrack expanded in the matrix, and let out the repair agent to fill the crack and to recover the matrix.

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