A self-reinforcing and self-healing elastomer with high strength, unprecedented toughness and room-temperature reparability

2021 ◽  
Author(s):  
Yuhan Li ◽  
Wenjuan Li ◽  
Ailing Sun ◽  
Mengfan Jing ◽  
Xingjiang Liu ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Strength ◽  
Self Healing ◽  
Polyurethane Elastomers ◽  
Strain Induced Crystallization ◽  
Induced Crystallization

A mechano-responsive strategy, known as strain-induced crystallization, is proposed to tailor room-temperature self-healing, highly mechanically-strong and unprecedentedly tough polyurethane elastomers.

A room-temperature self-healing elastomer with ultra-high strength and toughness fabricated via optimized hierarchical hydrogen-bonding interactions

2022 ◽  
Author(s):  
Liangliang Xia ◽  
Ming Zhou ◽  
Hongjun Tu ◽  
wen Zeng ◽  
xiaoling Yang ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Mechanical Strength ◽  
Room Temperature ◽  
Polymeric Materials ◽  
High Strength ◽  
Self Healing ◽  
High Mechanical Strength ◽  
Hydrogen Bonding Interactions ◽  
Healing Efficiency ◽  
Good Healing

The preparation of room-temperature self-healing polymeric materials with good healing efficiency and high mechanical strength is challenging. Two processes are essential to realise the room-temperature self-healing of materials: (a) a...

Preparation of Room-temperature Self-healing Elastomers with High Strength Based on Multiple Dynamic Bonds

2021 ◽  
pp. 110614
Author(s):  
Wencong Zhang ◽  
Minhui Wang ◽  
Jiahui Zhou ◽  
Yeming Sheng ◽  
Min Xu ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Strength ◽  
Self Healing ◽  
Strength Based

Tensile Strength of Polyurethane and other Elastomeric Block Copolymers

1976 ◽  
Vol 49 (1) ◽  
pp. 64-84 ◽  
Author(s):  
Thor L. Smith
Keyword(s):  
Dominant Factor ◽  
Domain Formation ◽  
Limited Information ◽  
Segmented Polyurethane ◽  
Polyurethane Elastomers ◽  
Type Size ◽  
Strain Induced Crystallization ◽  
Hard Segments ◽  
General Relations ◽  
Induced Crystallization

Abstract The discussion in this paper has been focused on the strength of Polyurethane elastomers, data on other materials being presented for comparison and to illustrate factors that affect strength. Although the literature on Polyurethane elastomers is voluminous, only in recent years has it been widely recognized that plastic domains exist in most polyurethane formulations of technological importance. Evidence for domain formation and aspects of domain morphology are discussed in recent reviews. The morphology of domains in segmented polyurethane elastomers is more complex than of those in triblock elastomers and has not been studied extensively, although progress is being made, indicated by the discussions in recent publications and references cited therein. In view of the complexities of fracture and the limited information on the morphology and time-dependent mechanical properties of polyurethane elastomers, only general relations between strength and chemical structure have thus far been established. On the other hand, useful correlations can be established by considering the type, size, and concentration of the hard segments and whether strain-induced crystallization is a dominant factor.

Synthesis and properties of room-temperature self-healing polyurethane elastomers

2017 ◽  
Vol 54 (12) ◽  
pp. 956-966 ◽  
Author(s):  
Xiaofei Wang ◽  
Yanyan Wei ◽  
Dong Chen ◽  
Yapeng Bai
Keyword(s):  
Room Temperature ◽  
Self Healing ◽  
Polyurethane Elastomers

Effect of Interfacial Bonding on the Self-Adhesion of SBR and Neoprene

1984 ◽  
Vol 57 (1) ◽  
pp. 216-226 ◽  
Author(s):  
A. K. Bhowmick ◽  
A. N. Gent
Keyword(s):  
Adhesive Strength ◽  
Room Temperature ◽  
The Self ◽  
Structural Factors ◽  
Viscous Effects ◽  
Threshold Conditions ◽  
Different Types ◽  
Strain Induced Crystallization ◽  
Induced Crystallization ◽  
Strength Of Adhesion

Abstract When two elastomer layers are partially crosslinked in contact with each other, the strength of adhesion increases. This effect has now been studied for simple vulcanizates of SBR and for CR vulcanizates crosslinked with sulfur and/or oxide linkages. Under threshold conditions, e.g., at high temperatures and in the swollen state, when both viscous effects and strain-induced crystallization are virtually eliminated, the work of detachment is small and approximately proportional to the inferred degree of interlinking, rising from a few J/m2 when only Van der Waals' attractions are present, up to 40–70 J/m2 in the fully-interlinked state. No significant differences were observed between SBR and CR vulcanizates, or with different types of crosslinking of CR. The principal structural factors governing the adhesive strength under threshold conditions appear to be the number and length of the molecular strands comprising the network and crossing the interface. The threshold fracture energy is directly proportional to the density of such strands and is smaller for shorter strands, in accord with the theory of Lake and Thomas. Under normal conditions, e.g., at room temperature and in the unswollen state, CR vulcanizates were found to adhere much more strongly for a given degree of interlinking, presumably due to strain-induced crystallization. Indeed, some enhancement of strength persisted even at temperatures of 100–150°C, in the unswollen state.

Synergy between dynamic covalent boronic ester and boron–nitrogen coordination: strategy for self-healing polyurethane elastomers at room temperature with unprecedented mechanical properties

2021 ◽  
Author(s):  
Kai Song ◽  
Wujin Ye ◽  
Xingchen Gao ◽  
Huagao Fang ◽  
Yaqiong Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Interactions ◽  
Room Temperature ◽  
Self Healing ◽  
Polyurethane Elastomers ◽  
Coordination Strategy ◽  
Boronic Ester ◽  
Healing Efficiency ◽  
Boron Nitrogen

Boron–nitrogen coordination in polyurethane elastomers enhances the dynamics of the boronic ester while introduces inter- and intra-molecular interactions, leading to mechanical robustness and excellent self-healing efficiency simultaneously.

Strain-Induced Crystallization and Strength of Rubber

2002 ◽  
Vol 75 (5) ◽  
pp. 923-934 ◽  
Author(s):  
A. N. Gent ◽  
L.-Q. Zhang
Keyword(s):  
Tensile Strength ◽  
High Strength ◽  
Heat Of Fusion ◽  
X Ray Diffraction ◽  
Melting Temperatures ◽  
Molecular Features ◽  
Strain Induced Crystallization ◽  
Lower Heat ◽  
Degree Of Crystallization ◽  
Induced Crystallization

Abstract The rate and extent of crystallization in crosslinked samples of natural rubber (NR), cis-1,4-polybutadiene (BR), and butyl rubber (IIR), were studied by observing the relaxation of stress in stretched strips, held at low temperatures. Melting temperatures were measured from the recovery of stress on warming. The melting temperature was raised by stretching, and the rise was significantly greater for NR than for BR, consistent with the lower heat of fusion of NR. In some cases crystallization was also followed by volume changes, or by DSC or x-ray diffraction. The maximum degree of crystallization was estimated to be only about 20% for BR, 28% for NR, and somewhat higher for IIR. On raising the temperature the tensile strength showed a marked drop to only 1–2 MPa when the elastomer failed to crystallize on stretching. At lower temperatures, when strain-induced crystallization occurred, the tensile strength was much higher, but the values were different for the three elastomers: about 10 MPa for BR, 20 MPa for NR, and 30 MPa for IIR, roughly in proportion to the inferred extent of crystallization. We speculate that molecular entanglements (more dense in BR and less dense in IIR than in NR) are severe obstacles to crystallization in high-molecular-weight polymers. Some specific molecular features are inferred that are needed for an elastomer to crystallize on stretching and to exhibit high strength over a wide temperature range.

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.

ALUMINUM 713.0

Alloy Digest ◽  
1985 ◽  
Vol 34 (12) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Room Temperature ◽  
High Strength ◽  
Heat Treating ◽  
Good Combination ◽  
Casting Alloy ◽  
Silicon Alloys ◽  
Aluminum Silicon Alloys ◽  
Permanent Mold Castings ◽  
Aluminum Base

Abstract ALUMINUM 713.0 is an aluminum-base casting alloy that ages at room temperature to provide high-strength sand and permanent-mold castings. It has a good combination of mechanical properties and its corrosion resistance is equivalent to that of the aluminum-silicon alloys. It is dimensionally stable. Among its many uses are housings, machinery parts, fittings, lever arms and brackets. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Al-263. Producer or source: Various aluminum companies.

A self-healable, stretchable, tear-resistant and sticky elastomer enabled by a facile polymer blends strategy

2021 ◽  
Vol 9 (7) ◽  
pp. 3931-3939
Author(s):  
Shiqiang Song ◽  
Honghao Hou ◽  
Jincheng Wang ◽  
Pinhua Rao ◽  
Yong Zhang
Keyword(s):  
Polymer Blends ◽  
High Strength ◽  
Self Healing ◽  
Potential Applications ◽  
Physical Blending

A high-stretchability, high-strength, tear-resistant, self-healing and adhesive elastomer is prepared through a facile and effective physical blending strategy. The elastomer shows potential applications in e-skin devices.

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