An effect of surface segregation of polyhedral oligomeric silsesquioxanes on surface physical properties of acrylic hard coating materials

Chouwatat, Patcharida; Nojima, Shiki; Higaki, Yasuki; Kojio, Ken; Hirai, Tomoyasu; Kotaki, Masaya; Takahara, Atsushi

doi:10.1016/j.polymer.2015.12.037

Cited by 15 publications

(9 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absorption peak at 1604 cm −1 became weaker than for OvPOSS because of the reaction between OvPOSS and PMB. The FTIR spectra confirmed that OVPOSS was grafted onto the PMB matrix via eight reactive CC groups . Figure (b) shows that the thermogravimetric analysis curves of the OvPOSS/PMB composites showed that pure PMB begins to decompose and lose weight at 248.3 °C, which is lower than the OvPOSS/PMB composites at 267.7 °C.…”

Section: Resultsmentioning

confidence: 86%

“…The FTIR spectra confirmed that OVPOSS was grafted onto the PMB matrix via eight reactive C C groups. 32 Figure 3(b) shows that the thermogravimetric analysis curves of the OvPOSS/PMB composites showed that pure PMB begins to decompose and lose weight at 248.3 C, which is lower than the OvPOSS/PMB composites at 267.7 C. Besides, the 10% OvPOSS/PMB composites had the best thermal stability among the OvPOSS composites prepared. The improved thermal stability of the PMB composites with 10% OvPOSS can be attributed to the stiffness of the POSS cage, the high bonding energy of the Si O Si framework, and the crosslinked network caused by POSS that may affect the movement of the molecular polymer chains.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Tribological properties of the polyacrylate/PTFE coating modified by POSS in the space environment

Wan

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

The irradiation conditions in the low earth orbit (LEO) severely inhibit the development of polymeric materials for solid lubrication coatings used on the external surfaces of spacecraft. To solve the problem, octavinyl polyhedral oligomeric silsesquioxanes (OvPOSS) were covalently grafted onto poly(methyl/butyl methacrylate) composites (PMB). The results showed that the appropriate incorporation of OvPOSS (10 wt %) significantly reduced the friction coefficient and improved the wear resistance of the OvPOSS/PMB composite coatings. Furthermore, the impact of OvPOSS on the tribological properties of PMB/polytetrafluoroethylene (PTFE) lubrication coatings in the space environment was investigated. In particular, the degradations, mass losses, surface morphologies, and chemical compositions of POSS/PMB/PTEF composite coatings were characterized under ultraviolet (UV), electric irradiation (EI), and atomic oxygen (AO). The results indicated that OvPOSS provides numerous SiOSi bonds in the polymer matrix that improve the resistance to UV and EI. Besides, a passivating SiO2 layer was formed to prevent further erosion and degradation of the underlying PMB and PTFE components during AO irradiation. Particularly, the wear resistance of OvPOSS/PMB/PTFE coatings under AO irradiation increased significantly compared with the pristine PMB/PTFE coating. Overall, our results indicate that POSS‐containing composites are a good prospective material for space application in the LEO. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48730.

show abstract

Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Tribological properties of the polyacrylate/PTFE coating modified by POSS in the space environment

Wan

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Unlike inorganic materials, such as ceramics and metals, polymers are susceptible to surface damage even at low load. These scratch damages are related to polymer deformation and fracture like shear yielding and crazing/cracking . To date, most of the scratch behavior investigations are limited to bulk scale structure–property relationship correlation.…”

Section: Introductionmentioning

confidence: 99%

“…These scratch damages are related to polymer deformation and fracture like shear yielding and crazing/cracking. [10][11][12][13][14] To date, most of the scratch behavior investigations are limited to bulk scale structure-property relationship correlation. Few studies on how the molecular orientation and molecular mobility of a polymer influence scratch behavior have been performed.…”

mentioning

confidence: 99%

Effect of Blend Composition on Scratch Behavior of Polystyrene/Poly(2,6‐dimethyl‐1,4‐phenyleneoxide) Blends

Kojio

Kiyoshima²,

Kajiwara³

et al. 2018

Macro Chemistry & Physics

Self Cite

View full text Add to dashboard Cite

The relationship between the scratch behavior and molecular aggregation states of polystyrene (PS), poly(2,6‐dimethyl‐1,4‐phenyleneoxide) (PPO), and their blends, is investigated based on differential scanning calorimetry (DSC), wide‐angle X‐ray diffraction (WAXD), polarized optical microscopy (POM), and indentation and scratch tests. DSC reveals that all the PS/PPO blends show the single glass transition temperature (Tg) and the Tg monotonically increase and Tg breadth exhibits a maximum, with an increase in PPO content. Furthermore, density and intermolecular chain distance obtained by WAXD exhibits maximum and minimum values at near 50 wt% of PPO, respectively. It is evident that densification occurs by blending PS and PPO. The scratch coefficient of friction (SCOF) value of PS is the largest and PS exhibits a fish‐scale pattern after scratch testing, while the SCOF value of PPO is much smaller than PS and PPO exhibits smooth groove formation. The PS50/PPO50 and PS20/PPO80 blends exhibit superior scratch and indentation resistance than PS and PPO. Damage morphology observation by POM and indentation tests reveals that molecular orientation is more restricted, and resistance against indentation increases for blends. This is due mainly to densification of the blend system.

show abstract

“…[12][13][14][15][16] The most investigated POSS species is octa-silsequioxane (T 8 -POSS) which possesses a cubic inorganic Si 8 O 12 core with side length of 5.3 Å surrounded by eight tunable substituent groups. [17][18][19][20] Owing to the inorganic constituent and rigid regular structure, POSS cages show strong aggregation propensity. Therefore, one particular focus is directed toward the higher-order structures of POSS derivatives in organic solvents (such as micellar and vesicular structures) or in the polymer matrix (such as lamellar and cylindrical structures).…”

Section: Introductionmentioning

confidence: 99%

Structural analysis of dendrimers based on polyhedral oligomeric silsesquioxane and their assemblies in solution by small-angle neutron scattering: Fits to a modified two correlation lengths model

Yuan

Wang

et al. 2016

Polymer

View full text Add to dashboard Cite

The small-angle neutron scattering (SANS) technique has been used to investigate the structure of dendrimers based on polyhedral oligomeric silsesquioxane (POSS) in solution. Three generations and two distinct terminal groups (either vinyl or polyethylene glycol (PEG) terminal groups) as well as four concentrations for each dendrimer have been measured in deuterated tetrahydrofuran. Two main scattering regimes, one with a length scale of nm and the other with a length scale of sub-micron, are found to contribute to the SANS signals. In order to fit the SANS data, a new modified two correlation lengths model has been developed. Fit parameters include scale factors, correlation lengths, Porod exponents and "particle" elongation parameters. Our fit results show that the local structure does not correspond to single dendrimer molecules, but rather to POSS-rich domains surrounded by POSS-poor domains. The large-scale structure represents the overall morphology of multi-dendrimer aggregates. The flexible PEG outer links help to enhance the stability of inorganic POSS cages, and allow the hybrid polymers to adjust their conformation in order to respond to their surroundings. With increasing concentration, the local structure becomes more compact as evidenced by the decrease of correlation length and concurrent increase of the Porod exponent. The deformation of local structure during the compaction process is also observed. The structure becomes elongated at intermediate concentrations whereas it tends to be more globular at low and high concentrations.

show abstract

An effect of surface segregation of polyhedral oligomeric silsesquioxanes on surface physical properties of acrylic hard coating materials

Cited by 15 publications

References 32 publications

Tribological properties of the polyacrylate/PTFE coating modified by POSS in the space environment

Tribological properties of the polyacrylate/PTFE coating modified by POSS in the space environment

Effect of Blend Composition on Scratch Behavior of Polystyrene/Poly(2,6‐dimethyl‐1,4‐phenyleneoxide) Blends

Structural analysis of dendrimers based on polyhedral oligomeric silsesquioxane and their assemblies in solution by small-angle neutron scattering: Fits to a modified two correlation lengths model

Contact Info

Product

Resources

About