Development of Flexible LEO-Resistant PI Films for Space Applications Using a Self-Healing Mechanism by Surface-Directed Phase Separation of Block Copolymers

2010 ◽  
Vol 2 (8) ◽  
pp. 2218-2225 ◽  
Author(s):  
Hartmut R. Fischer ◽  
Karin Tempelaars ◽  
Aat Kerpershoek ◽  
Theo Dingemans ◽  
M. Iqbal ◽  
...  
Keyword(s):  
Phase Separation ◽  
Block Copolymers ◽  
Self Healing ◽  
Space Applications

scholarly journals Self-healing materials for space applications: overview of present development and major limitations

2021 ◽  
Author(s):  
Laura Pernigoni ◽  
Ugo Lafont ◽  
Antonio Mattia Grande
Keyword(s):  
Orbital Debris ◽  
Space Environment ◽  
Technological Evolution ◽  
Self Healing ◽  
Space Systems ◽  
Space Applications ◽  
Structural Fatigue ◽  
Operational Life ◽  
Technological Limitations ◽  
Human Exploration

AbstractIn the last decade, self-healing materials have become extremely appealing for the field of space applications, due to their technological evolution and the consequent possibility of designing space systems and structures able to repair autonomously after damage arising from impacts with micrometeoroids and orbital debris, from accidental contact with sharp objects, from structural fatigue or simply due to material aging. The integration of these novel materials in the design of spacecraft structures would result in increased reliability and safety leading to longer operational life and missions. Such concepts will bring a decisive boost enabling new mission scenario for the establishment of new orbital stations, settlement on the Moon and human exploration of Mars.The proposed review aims at presenting the newest and most promising self-healing materials and associated technologies for space application, along with the issues related to their current technological limitations in combination with the effect of the space environment. An introductory part about the outlooks and challenges of space exploration and the self-healing concept is followed by a brief description of the space environment and its possible effects on the performance of materials. Self-healing materials are then analysed in detail, moving from the general intrinsic and extrinsic categories down to the specific mechanisms.

Nanocomposites for Space Applications

2020 ◽  
pp. 191-222
Author(s):  
Rafael Vargas-Bernal ◽  
Margarita Tecpoyotl-Torres
Keyword(s):  
Electromagnetic Interference ◽  
Hybrid Nanocomposites ◽  
Space Environment ◽  
Self Healing ◽  
Two Dimensional ◽  
Space Applications ◽  
Aerospace Applications ◽  
Structural Applications ◽  
Two Dimensional Materials ◽  
Carbon Based Nanomaterials

A review on the advances achieved in the last 25 years in the development of hybrid nanocomposites based on polymer matrix for aerospace applications is presented here. The chapter analyzes the state-of-the-art strategies used in the design of materials that support the different conditions of the space environment. These materials are aimed primarily at structural applications, electromagnetic interference shielding, self-sensing, and self-healing, although they are not restricted to these applications. The introduction of metallic, ceramic, carbon-based nanomaterials such as carbon nanotubes and graphene, as well as two-dimensional materials have been used with a successful impact. Despite the significant advances that have been reached, much work must be done to achieve complete reliability for all properties required to protect the systems against the hazardous conditions found in space. Therefore, futuristic visions of the actions that must be carried out are raised in this chapter.

scholarly journals Microphase separation of highly amphiphilic, low N polymers by photoinduced copper-mediated polymerization, achieving sub-2 nm domains at half-pitch

2019 ◽  
Vol 10 (46) ◽  
pp. 6254-6259 ◽  
Author(s):  
Ellis Hancox ◽  
Evelina Liarou ◽  
James S. Town ◽  
Glen R. Jones ◽  
Siân A. Layton ◽  
...  
Keyword(s):  
Phase Separation ◽  
Block Copolymers ◽  
Polyacrylic Acid ◽  
Microphase Separation

Fluoro-polyacrylic acid block copolymers with vary narrow dispersity are shown to have sub-2 nm domain sizes on phase separation.

Elastomeric Polyether-Ester Block Copolymers. I. Structure-Property Relationships of Tetramethylene Terephthalate/Polyether Terephthalate Copolymers

1977 ◽  
Vol 50 (4) ◽  
pp. 688-703 ◽  
Author(s):  
J. R. Wolfe
Keyword(s):  
Phase Separation ◽  
Melting Point ◽  
Block Copolymers ◽  
Low Temperature ◽  
Chain Length ◽  
Chemical Structure ◽  
High Water ◽  
Structure Property ◽  
Tear Strength ◽  
Structure Property Relationships

Abstract The properties of elastomeric tetramethylene terephthalate/polyether terephthalate copolymers have been related to the chemical structure, chain length, and concentration in the copolymers of the PTMEG-, PEG-, and PPG-derived polyether units. Low-temperature properties and tear strength are dependent on all three polyether-related variables. Melting point, hardness, and stress at 100% elongation appear to be independent of polyether structure. Polyether glycols of low MW volatilize during copolymer preparation. High-MW polyethers tend to crystallize when present in the copolymers. Polyether glycols of intermediate MW (∼ 1000) yield copolymers with the best resistance to low-temperature stiffening. Copolymer synthesis is most difficult with PPG as the polyether glycol. Inherent viscosities are low, and phase separation occurs at lower polyether MW than with PTMEG or PEG. The PEG-based copolymers exhibit high water swell, particularly at intermediate and high PEG MW. The PTMEG-based copolymers are easiest to synthesize and exhibit the best overall combination of properties.

scholarly journals Phase-Separation-Induced Anomalous Stiffening, Toughening, and Self-Healing of Polyacrylamide Gels

2015 ◽  
Vol 27 (43) ◽  
pp. 6990-6998 ◽  
Author(s):  
Koshiro Sato ◽  
Tasuku Nakajima ◽  
Toshiyuki Hisamatsu ◽  
Takayuki Nonoyama ◽  
Takayuki Kurokawa ◽  
...  
Keyword(s):  
Phase Separation ◽  
Self Healing ◽  
Polyacrylamide Gels

A Metal Salt Dependent Self-Healing Response in Supramolecular Block Copolymers

2016 ◽  
Vol 49 (22) ◽  
pp. 8418-8429 ◽  
Author(s):  
Marcel Enke ◽  
Ranjita K. Bose ◽  
Stefan Bode ◽  
Jürgen Vitz ◽  
Felix H. Schacher ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Metal Salt ◽  
Self Healing ◽  
Healing Response

Characterising the disordered state of block copolymers: Bifurcations of localised states and self-replication dynamics

2011 ◽  
Vol 23 (2) ◽  
pp. 315-341 ◽  
Author(s):  
KARL B. GLASNER
Keyword(s):  
Phase Separation ◽  
Block Copolymers ◽  
Bifurcation Diagram ◽  
Density Functional ◽  
Functional Model ◽  
Critical Regime ◽  
Heterogeneous Structure ◽  
Localised States ◽  
Pattern Forming ◽  
Self Replication

Above the spinodal temperature for micro-phase separation in block co-polymers, asymmetric mixtures can exhibit random heterogeneous structure. This behaviour is similar to the sub-critical regime of many pattern-forming models. In particular, there is a rich set of localised patterns and associated dynamics. This paper clarifies the nature of the bifurcation diagram of localised solutions in a density functional model of A−B diblock mixtures. The existence of saddle-node bifurcations is described, which explains both the threshold for heterogeneous disordered behaviour as well the onset of pattern propagation. A procedure to generate more complex equilibria by attaching individual structures leads to an interwoven set of solution curves. This results in a global description of the bifurcation diagram from which dynamics, in particular self-replication behaviour, can be explained.

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