Oligomeric Poly(ethylene oxide)-Functionalized Silsesquioxanes:  Interfacial Effects on Tg, Tm, and ΔHm

Maitra, Prithwiraj; Wunder, Stephanie L.

doi:10.1021/cm0203518

Cited by 87 publications

(78 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar decrease of crystallinity upon the incorporation of EO chains at 8-corners of POSS was also reported by Maitra and Wunder. 48 Thermal gravimetric analysis (TGA) was applied to evaluate the thermal stability of the polymers containing POSS and oligo(EO) side groups (Figure 7 and Table II). For comparison, TGA curves of allyl-CyPOSS and starting polysiloxane (PEHS) were also observed.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and properties of polysiloxanes containing polyhedral oligomeric silsesquioxane (POSS) and oligo (ethylene oxide) groups in the side chains

2010

View full text Add to dashboard Cite

Comb-like polysiloxanes with polyhedral oligomeric silsesquioxane (POSS) and oligo(ethylene oxide) groups (EO) in the side chains were prepared through the hydrosilylation reaction of poly(ethylhydrosiloxane) (PEHS) with 1-allyl-3,5,7,9,11,13,15-heptacyclopentylpentacyclo-[9.5.1.1 3,9 .1 5,15 .1 7,13 ] octasiloxane (allyl-CyPOSS) and allyl-functionalized oligo(ethylene glycol) monomethyl ethers. The physical and chemical properties of these polysiloxanes were studied systematically by changing the content of bulky POSS groups and hydrophilic flexible oligo(ethylene oxide) groups with different lengths. For example, the glass transition temperature of the polymer increased with increasing content of POSS side groups, whereas the melting temperature and heat of fusion of the oligo(ethylene oxide) side group decreases. Furthermore, the glass transition temperature and melting temperature increase when the length of the EO group was increased, whereas the decomposition temperature decreased.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis and properties of polysiloxanes containing polyhedral oligomeric silsesquioxane (POSS) and oligo (ethylene oxide) groups in the side chains

2010

View full text Add to dashboard Cite

show abstract

“…Functionalized POSS particles are ideally suited for fundamental studies due to their well-defined organic/inorganic architecture at the molecular level and the wide range of organic outer shells that can be attached to the POSS particles [24][25][26]. Wunder and coworkers http://dx.doi.org/10.1016/j.ssi.2017.08.007 Received 25 July 2017; Received in revised form 11 August 2017; Accepted 13 August 2017 investigated PEO-terminated POSS as a liquid based electrolyte depending on the PEO chain length and the Li salt nature [27][28][29][30][31]. For short PEO chains, between 4 and 8 repeat units, the ionic conductivity at room temperature is about 10 − 4 S/cm.…”

Section: Introductionmentioning

confidence: 99%

Crosslinked perfluoropolyether solid electrolytes for lithium ion transport

et al. 2017

View full text Add to dashboard Cite

A B S T R A C TPerfluoropolyethers (PFPE) are commercially available non-flammable short chain polymeric liquids. Endfunctionalized PFPE chains solvate lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt and these mixtures can be used as electrolytes for lithium (Li) batteries. Here we synthesize and characterize a new class of solid PFPE electrolytes. The electrolytes are made by either thermal or UV crosslinking PFPE chains with urethane methacrylate end-groups. For the synthesis of thermally crosslinked electrolytes, polyhedral oligomeric silsesquioxane (POSS) with organic acrylopropyl groups was used as crosslinker agent, while for UV cured electrolytes a photoinitiatior was used. We present thermal, morphological, and electrical data of the solid electrolytes. We compare these properties with those of the two parent liquids (PFPE with urethane methacrylate end-groups and POSS with acrylopropyl groups) mixed with LiTFSI. The solubility limit of LiTFSI in the PFPE-based solids is higher than that in the liquids. The conductivity data are analyzed using the Vogel-Tamman-Fulcher equation. The concentration of effective charge carriers is a strong function of the nature of the solvent (solid versus liquid) whereas the activation energy is neither a strong function of the nature of the solvent nor salt concentration.

show abstract

“…While short chain polyethylene glycol (PEG) oligomers exhibit good ionic conductivity at room temperature as well as chemical and thermal stability, amorphous low molecular weight electrolytes lack mechanical strength. The addition of free inorganic particles [3][4][5][6][7] as well as inorganic networks [8] and inorganic-organic constituents [9][10][11] to polymer electrolytes has been shown to improve both mechanical properties and conductivity.In this communication, we report on a new class of solvent-free, nanoscale organic hybrid materials (NOHMs), which simultaneously manifest superionic conductivities, large electrochemical stability windows (-0.5V to > 5 V, vs Li), good lithium ion transference numbers (~0.45), no volatility and thermal stabilities up to 400 o C, and which offer multiple handles through which near molecular control can be exerted on mechanical properties. All of these features provide unusual opportunities for engineering new families of high-performance, nanoscale hybrid…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Nanoscale Organic Hybrid Electrolytes

2010

View full text Add to dashboard Cite

Significant effort has been devoted by research groups world-wide to the development of polymer and composite polymer electrolytes for use in lithium batteries [1,2] . The best known polymer ionic conductor, polyethylene oxide (PEO), is crystalline and has low conductivity at room temperature. While short chain polyethylene glycol (PEG) oligomers exhibit good ionic conductivity at room temperature as well as chemical and thermal stability, amorphous low molecular weight electrolytes lack mechanical strength. The addition of free inorganic particles [3][4][5][6][7] as well as inorganic networks [8] and inorganic-organic constituents [9][10][11] to polymer electrolytes has been shown to improve both mechanical properties and conductivity.In this communication, we report on a new class of solvent-free, nanoscale organic hybrid materials (NOHMs), which simultaneously manifest superionic conductivities, large electrochemical stability windows (-0.5V to > 5 V, vs Li), good lithium ion transference numbers (~0.45), no volatility and thermal stabilities up to 400 o C, and which offer multiple handles through which near molecular control can be exerted on mechanical properties. All of these features provide unusual opportunities for engineering new families of high-performance, nanoscale hybrid

show abstract

Oligomeric Poly(ethylene oxide)-Functionalized Silsesquioxanes: Interfacial Effects on T_g, T_m, and ΔH_m

Cited by 87 publications

References 32 publications

Synthesis and properties of polysiloxanes containing polyhedral oligomeric silsesquioxane (POSS) and oligo (ethylene oxide) groups in the side chains

Synthesis and properties of polysiloxanes containing polyhedral oligomeric silsesquioxane (POSS) and oligo (ethylene oxide) groups in the side chains

Crosslinked perfluoropolyether solid electrolytes for lithium ion transport

Nanoscale Organic Hybrid Electrolytes

Contact Info

Product

Resources

About