Enhanced resistance to atomic oxygen of OG POSS/epoxy nanocomposites

Choi, Chunghyeon; Kim, Yun‐Ho; Kumar, Sarath Kumar Sathish; Kim, Chun-Gon

doi:10.1016/j.compstruct.2018.05.011

Cited by 29 publications

(11 citation statements)

References 27 publications

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“…Based on literature reports, addition of POSS to the epoxy-based foam matrix is anticipated to not only improve the thermal stability 25 and mechanical performance, 45 but also the resistance to UV degradation. [5][6][7][46][47][48][49][50][51][52] However, given the wide range in reported properties of the polymer-POSS composites for both improved dielectric properties and increased conductivities, it is unclear how the presence of the POSS particulates contained in the foam matrix volume will impact the thermal conductance in the foam struts and filaments. As previously mentioned, several reports have described improvements in dielectric performance, 15,24,27,28 but this may or may not directly impact the thermal conductivity since electrical and thermal conductivity have similar but not identical fundamental mechanisms.…”

Section: Introductionmentioning

confidence: 99%

“…These foams contain pore structures in the form of hollow microchannels with engineered microchannel orientations created via extraction of thermoplastic templating fibers after curing of the infused thermosetting epoxy resin (for reference, these materials are shown in Figure 2). Based on literature reports, addition of POSS to the epoxy‐based foam matrix is anticipated to not only improve the thermal stability 25 and mechanical performance, 45 but also the resistance to UV degradation 5–7,46–52 . However, given the wide range in reported properties of the polymer‐POSS composites for both improved dielectric properties and increased conductivities, it is unclear how the presence of the POSS particulates contained in the foam matrix volume will impact the thermal conductance in the foam struts and filaments.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and thermal properties of microchannel insulating foams comprising a multifunctional epoxy/polyhedral oligomeric silsesquioxane nanocomposite

2020

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Polymer matrix composites are well suited for applications in space environments due to their excellent specific strengths and moduli, thermal properties, and tailorability. In efforts to further improve their performance, additives based on functionalized polyhedral oligomeric silsesquioxanes (POSS) have been successfully shown to increase long-term durability by improving Atomic Oxygen (AO) and UV radiation resistance, as well as enhance both the thermal and mechanical properties of the polymer-based structure. In the present work, an epoxy-functionalized POSS has been used as a low-percentage additive in the epoxy matrix structure of microchannel foams, resulting in improved mechanical properties and thermal stability without significantly increasing the resin viscosity, final bulk density, or thermal conductivity of the final foam structures. These nanocomposite POSS resins are also expected to display increased AO and UV longevity in space applications, allowing these multifunctional materials to not only achieve high-performance capabilities but also be economically suitable for devices used in space environments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical and thermal properties of microchannel insulating foams comprising a multifunctional epoxy/polyhedral oligomeric silsesquioxane nanocomposite

2020

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“…The –Si–O–Si– peaks at ∼1127 and ∼1037 cm −1 represent POSS-EP0418 and POSS-EP0409, respectively. 29,30 The –Si–O– cage inorganic skeletons of POSS-EP0418 and POSS-EP0409 were grafted onto the CF surface. For POSS-AM0265, a new characteristic peak appeared at ∼3473 cm −1 , which was assigned to the stretching vibration of –NH 2 .…”

Section: Resultsmentioning

confidence: 99%

Improved atomic oxygen erosion resistance of the carbon fibre–epoxy interface with polyhedral oligomeric silsesquioxane

Zhao

Zheng

et al. 2020

High Performance Polymers

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Polyhedral oligomeric silsesquioxane (POSS) was grafted onto the surface of carbon fibres (CFs) to fabricate carbon fibre/epoxy (CF/EP) composites with improved interlaminar shear strength (ILSS) and atomic oxygen (AO) erosion resistance. POSS-CF was prepared by reacting amine groups on the pretreated CF surface with the POSS to form a continuous uniform layer of siloxane oligomers. X-Ray photoelectron spectroscopy, scanning electron microscopy and Fourier transform infrared spectroscopy demonstrated that POSS was successfully grafted onto the CF surface. The ILSS and AO erosion resistance of the POSS-treated CFs and CF-EP interface were improved because a SiO2 passivation layer formed with AO exposure, especially with POSS-EP0409. This is an effective solution for enhancing the interfacial bonding force and interfacial AO erosion resistance for the low-Earth orbit environment.

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“…However, such protective layers can be damaged due to hypervelocity debris impact, as well as by ground-based handling [ 24 ]. A potential solution is to incorporate inorganic constituents such as silica into the polymer backbone [ 25 , 26 , 27 , 28 , 29 ]. POSS is a cage-like silicon oxide-based molecule that contains various organic functional groups [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of POSS Type on the Shape Memory Properties of Epoxy-Based Nanocomposites

Bram

Gouzman²,

Bolker³

et al. 2020

Molecules

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Thermally activated shape memory polymers (SMPs) can memorize a temporary shape at low temperature and return to their permanent shape at higher temperature. These materials can be used for light and compact space deployment mechanisms. The control of transition temperature and thermomechanical properties of epoxy-based SMPs can be done using functionalized polyhedral oligomeric silsesquioxane (POSS) additives, which are also known to improve the durability to atomic oxygen in the space environment. In this study, the influence of varying amounts of two types of POSS added to epoxy-based SMPs on the shape memory effect (SME) were studied. The first type contained amine groups, whereas the second type contained epoxide groups. The curing conditions were defined using differential scanning calorimetry and glass transition temperature (Tg) measurements. Thermomechanical and SME properties were characterized using dynamic mechanical analysis. It was found that SMPs containing amine-based POSS show higher Tg, better shape fixity and faster recovery speed, while SMPs containing epoxide-based POSS have higher crosslinking density and show superior thermomechanical properties above Tg. This work demonstrates how the Tg and SME of SMPs can be controlled by the type and amount of POSS in an epoxy-based SMP nanocomposite for future space applications.

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Enhanced resistance to atomic oxygen of OG POSS/epoxy nanocomposites

Cited by 29 publications

References 27 publications

Mechanical and thermal properties of microchannel insulating foams comprising a multifunctional epoxy/polyhedral oligomeric silsesquioxane nanocomposite

Mechanical and thermal properties of microchannel insulating foams comprising a multifunctional epoxy/polyhedral oligomeric silsesquioxane nanocomposite

Improved atomic oxygen erosion resistance of the carbon fibre–epoxy interface with polyhedral oligomeric silsesquioxane

The Effect of POSS Type on the Shape Memory Properties of Epoxy-Based Nanocomposites

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