Characterisation of the thermal self-healing of a high crosslink density epoxy thermoset

2015 ◽  
Vol 39 (5) ◽  
pp. 3497-3506 ◽  
Author(s):  
Nan Bai ◽  
George P. Simon ◽  
Kei Saito
Keyword(s):  
Crosslink Density ◽  
Epoxy Polymer ◽  
Self Healing ◽  
High Crosslink Density

Different properties of a new self-healing TGAP-based epoxy polymer were studied and the influence of the crosslink density is demonstrated.

Flame Retardancy and Mechanical Properties of Bio‐Based Furan Epoxy Resins with High Crosslink Density

2019 ◽  
Vol 305 (1) ◽  
pp. 1900587 ◽  
Author(s):  
Jingjing Meng ◽  
Yushun Zeng ◽  
Pengfei Chen ◽  
Jie Zhang ◽  
Cheng Yao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flame Retardancy ◽  
Epoxy Resins ◽  
Crosslink Density ◽  
High Crosslink Density

Effect of Crosslink Density on Cut Growth in Black-Filled Natural Rubber Vulcanizates

2002 ◽  
Vol 75 (5) ◽  
pp. 935-942 ◽  
Author(s):  
G. R. Hamed ◽  
N. Rattanasom
Keyword(s):  
Carbon Black ◽  
Natural Rubber ◽  
Crack Growth ◽  
Crosslink Density ◽  
Longitudinal Crack ◽  
Test Pieces ◽  
Filled Rubber ◽  
Longitudinal Cracks ◽  
Natural Rubber Vulcanizates ◽  
High Crosslink Density

Abstract Tensile strengths, σb, of gum and N115-filled natural rubber test pieces, with and without edge pre-cuts, have been determined. At low crosslink density, the regular (uncut) σb of filled and gum vulcanizates is similar. However, at high crosslink density, the gum NR becomes brittle, while the corresponding filled rubber remains strong and resistant to cut growth. It is proposed that the tightly linked gum does not strain-crystallize appreciably during stretching, but that its filled counterpart does. Carbon black appears capable of inducing crystallization in a network that alone remains amorphous during extension. Filled vulcanizates of various crosslink densities have similar normal tensile strengths ( ≈ 30 MPa), but strengths differ, sometimes more than twofold, if a pre-cut is present. Lightly crosslinked specimens containing a small cut have strengths that depend very weakly on cut size, c. Furthermore, these develop long longitudinal cracks from which catastrophic rupture initiates. With larger cuts, strength decreases more rapidly with increasing c, there is less longitudinal crack growth, and rupture initiates near the original cut tip. In contrast, the strength of a highly crosslinked vulcanizate is sensitive to small cuts and test pieces exhibit minimal longitudinal cracking before failure.

From Soft Self-Healing Gels to Stiff Films in Suckerin-Based Materials Through Modulation of Crosslink Density andβ-Sheet Content

2015 ◽  
Vol 27 (26) ◽  
pp. 3953-3961 ◽  
Author(s):  
Dawei Ding ◽  
Paul A. Guerette ◽  
Jing Fu ◽  
Lihong Zhang ◽  
Scott A. Irvine ◽  
...  
Keyword(s):  
Crosslink Density ◽  
Self Healing

scholarly journals Thermo-reversible MWCNTs/epoxy polymer for use in self-healing and recyclable epoxy adhesive

2017 ◽  
Vol 35 (6) ◽  
pp. 728-738 ◽  
Author(s):  
Ya-kun Guo ◽  
Han Li ◽  
Peng-xiang Zhao ◽  
Xiao-fang Wang ◽  
Didier Astruc ◽  
...  
Keyword(s):  
Epoxy Polymer ◽  
Epoxy Adhesive ◽  
Self Healing

Non-covalent Tough Hydrogels for Functional Actuators

MRS Advances ◽  
2015 ◽  
Vol 1 (8) ◽  
pp. 501-507
Author(s):  
Jun Fu ◽  
Guorong Gao ◽  
Yuanna Sun
Keyword(s):  
Functional Groups ◽  
Crosslink Density ◽  
High Strength ◽  
Soft Robotics ◽  
Self Healing ◽  
Amino Groups ◽  
Design And Synthesis ◽  
Potential Applications ◽  
Responsive Hydrogels ◽  
Very High

ABSTRACTTough and responsive hydrogels have recently attracted great research interests for potential applications in artifical muscles, soft robotics, and actuators, etc. This paper overviews our recent progresses in the design and synthesis of hydrogels with very high strength and toughness, and actuators based on these hydrogels. Inorganic nanospheres, nanorods, and nanosheets are exploited as multi-functional crosslinkers to adsorb or bond with hydrophilic chains, leading to hydrogels with very high strength, toughness, fatigue resistance, and/or self-healing. Introduction of functional groups including ionic monomers and amino groups results in hydrogels reponsive to pH, ionic strength and electric field. Besides, ionoprinting has been used to change local crosslink density based on reversible chelating/decomposition of metal ions with functional groups. This process is rapid and thus enables reversible and rapid actuation of hydrogel devices. Our studies will further aim to develop sophiscated devices by assembling hydrogel actuators.

Multifunctional MWCNT Reinforced Self-Healing System

2012 ◽  
Author(s):  
Gefu Ji ◽  
Guoqiang Li ◽  
Su-Seng Pang
Keyword(s):  
Composite Structure ◽  
Epoxy Polymer ◽  
Self Healing ◽  
Three Point Bending ◽  
Reinforced Composite ◽  
Healing Efficiency ◽  
Bending Load ◽  
Polymer Dispersed ◽  
Actuator System ◽  
Carbon Nano Tube

Multi-Wall Carbon Nano Tube (MWCNT) reinforced composite structure has been widely researched. However, there are a few studies report the MWCNT as a sensor and an actuator integrated in the same composite structure to form a multifunctional composite. The composite used in this study was based on commercially available thermosetting epoxy polymer, dispersed with thermoplastic particles, and MWCNT. Multifunctional MWCNT reinforced epoxy polymer composite was fabricated and tested. The specimens were damaged by the three point bending load. The sensor and actuator system automatically detected the damage and triggered the out electric power to heal the damages. The healing efficiency was evaluated by measuring resistant of composite.

Autonomous self-healing polyisoprene elastomers with high modulus and good toughness based on the synergy of dynamic ionic crosslinks and highly disordered crystals

2020 ◽  
Vol 11 (41) ◽  
pp. 6549-6558
Author(s):  
Yohei Miwa ◽  
Mayu Yamada ◽  
Yu Shinke ◽  
Shoichi Kutsumizu
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Self Healing ◽  
High Modulus ◽  
Disordered Crystals ◽  
Ionic Crosslinks

We designed a novel polyisoprene elastomer with high mechanical properties and autonomous self-healing capability at room temperature facilitated by the coexistence of dynamic ionic crosslinks and crystalline components that slowly reassembled.

Congenital self-healing histiocytosis

1982 ◽  
Vol 118 (4) ◽  
pp. 267-272 ◽  
Author(s):  
E. Bonifazi
Keyword(s):  
Self Healing
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